Alloy Import Pitfalls (IV): Physical Damage and Corrosion Protection in Marine Logistics

——When the ocean, the crane, and the forklift do more damage than the mill ever could

Introduction: The Forgotten Risk Factor

An alloy bar does not teleport from the mill's shipping bay to your warehouse. Before it reaches your receiving dock, a single shipment of Inconel 625 tube or Alloy 718 bar will typically pass through more than 30 discrete handling points: mill dispatch, weighing, bundling, truck loading, terminal yard, container stuffing, gantry lift, vessel hold, transshipment, discharge, customs inspection, re-stuffing, drayage, and final unloading — and that list omits the smaller movements in between, each one involving a crane hook, a sling, a forklift tine, a strap, or a human hand.

Every one of those points is an opportunity for damage, and almost none of them are controlled by the buyer, the mill, or even the freight forwarder alone. The material is handled by people whose incentive is speed and whose metric is the container slot, not the scratch depth.

Buyers spend enormous effort specifying chemistry (Part I of this series), verifying mill certificates (Part II), and pinning down standards and revisions (Part III). Then the finished material is handed to a logistics chain where the contract of carriage is measured in weight and volume — not in surface condition, not in residual stress, and not in pitting potential. The mill that spent a fortune on vacuum melting and premium certification can be undone by a chain sling, a wet dunnage board, or a tarpaulin that leaks.

Why is logistics the forgotten risk factor? Three reasons stand out:

1. It is out of sight. Between the mill gate and your dock, the material exists only as a waybill line item. No metallurgist watches it; no inspector follows it. The ocean voyage is a black box of weeks with nobody accountable for the cargo's surface.
2. It is delegated. Freight contracts and INCOTERMS allocate responsibility by risk transfer, not by damage prevention. A carrier's liability for a scratched, corroded, or bent bar is typically a fraction of its value — often the freight cost itself — so the economics of care are backwards.
3. The damage is slow and hidden. A dent is visible; corrosion is not. Pitting that starts as a pinpoint under a strap in week two of a voyage is invisible at discharge, costs nothing at the dock, and reveals itself months later at machining or in service — long after every party has signed off and every claim window has closed.

This article, the fourth in our series on alloy import pitfalls, examines how alloy bar and tube are physically damaged in transit, how marine atmospheres corrode even "corrosion-resistant" grades, what specialized packaging can and cannot do, and what a disciplined receiving inspection looks like.

Part 1 — Surface Scratches and Gouges: Small Marks, Big Consequences

1.1 The Metallurgy of a Scratch

Fatigue cracks almost always nucleate at the surface. This is not an accident of geometry — it is mechanics: the highest bending and torsion stresses sit at the outer fiber, the surface carries the machining and handling history, and the surface is what sees the environment. A scratch or gouge concentrates stress locally by a factor of several (a sharp V-notch can multiply local stress by 3–5×), turning a nominally benign load into a locally yielding one.

The relationship between defect size and fatigue strength is not linear. For a given material there is a threshold defect size below which a scratch behaves like a surface roughness feature and above which it behaves like a crack. The stronger the material, the smaller that threshold. High-strength alloys — aged Inconel 718 at 180 ksi yield, Monel K-500 at 140 ksi — are highly notch-sensitive: a scratch of a few hundredths of a millimeter that a mild steel would shrug off can be the initiation site for a fatigue crack in a precipitation-hardened nickel alloy. In defect-tolerance terms (the Kitagawa–Takahashi framework familiar to fracture-mechanics engineers), allowable surface defect size shrinks as yield strength rises. The material that most deserves protection is precisely the material most easily damaged.

1.2 Where Scratches Come From

The typical offenders in a transit chain:

• Chain and wire-rope slings lifted without sleeves or edge protectors. Chain links bite into bar surfaces with concentrated point loads; wire rope abrades under tension.
• Forklift spears thrust between bundles, and the tines' upper edges score every bar in the bundle.
• Steel strapping tensioned hard against the bundle, sometimes directly on the metal with no corner protection.
• Bar-to-bar contact during a voyage: as the vessel rolls, loosely packed bundles rub against each other, and the relative motion of steel on steel produces fretting and longitudinal scoring.
• Cargo-to-cargo contact in a shared container: a neighboring steel coil or structural section with a sharp edge can gouge an unprotected bundle.

1.3 The "Cosmetic" Trap

The most dangerous classification in alloy logistics is "cosmetically damaged — acceptable." Three reasons:

• Surface integrity is functional. For machined components, fatigue life, not static strength, usually governs. A component machined from a bar that carries a 0.2 mm scratch at the location of maximum stress inherits a pre-existing stress raiser — the scratch is not removed by machining unless the machining allowance actually covers it.
• Embedded contamination survives machining. A chain sling transfers microscopic particles of carbon steel onto an alloy surface. Embedded iron in a stainless or nickel surface becomes a galvanic cell: the iron particle corrodes, and the alloy pits beneath it. Grinding can smear rather than remove such contamination.
• Pressure parts have hard limits. For tubes and piping in pressure service, surface defects below a critical depth are rejectable per the governing product specification and fabrication code — and a transit scratch can easily push a borderline tube below the line. A "cosmetic" scratch on a tube destined for offshore service is a non-conformance with a serial number.

Part 2 — Bending and Straightness: When a Bar Stops Being a Bar

2.1 The Tolerance Everybody Forgets

Bars are bought to dimensional tolerances, and straightness is a dimension. ASTM A484/A484M, the general requirements specification for stainless steel bars, permits hot-finished round bar straightness deviation on the order of 1/8 in (3.2 mm) in any 5 ft (1.5 m) — a tolerance that, over a 6 m bar, allows total camber in the range of several millimeters. Cold-finished bars are held tighter. Whatever the exact number on your drawing, the point is the same: straightness is a measurable, contractual property — and it is the property most frequently destroyed in transit.

The consequences are acute for precision machining. Swiss-type lathes feed bar stock through a guide bushing; a bent bar binds, whips, and produces out-of-tolerance parts while damaging tooling. Centerless grinding and gun-drilling are equally unforgiving of incoming camber. For long tubes, bending introduces ovality at the ends, kinked transitions, and collapsed bores — any of which can turn a pressure-tight tube into a leak path or a machining reject.

2.2 How Bars Get Bent in Transit

• Single-point slinging of long bundles. Lifting a 6 m bundle at one point lets the ends sag under their own weight; the plastic deformation is permanent. The correct practice — multiple spreader slings at quarter points — is often skipped for speed.
• Forklift handling of over-length bundles with the load cantilevered past the tines.
• Stacking without dunnage, so the weight of upper bundles bears on unsupported spans of the lower ones.
• Shifting during the voyage. A bundle inadequately lashed inside a container or hold can slide under vessel motion, and a sliding multi-ton bundle does not stop bending — it stops damaging. Longitudinal and transverse accelerations during a storm are routinely of the order of 0.5–0.8 g; a 2-ton bundle that shifts by even half a meter generates impact loads that can buckle bars and racks crates.

The asymmetry is worth stating plainly: a mill spends capital on straightening and stress-relieving to hit a camber tolerance; a forklift driver can erase that investment in four seconds. The tolerance that the mill certified must be re-verified at your dock — because between the two, the material was handled by people who never read the certificate.

Part 3 — Marine Corrosion: Sea-Spray and Salt Mist

3.1 The Ocean Is a Chloride Machine

Sea water carries roughly 19,000 mg/L of chloride. What reaches a ship's cargo is less dramatic but more insidious: marine aerosol — fine droplets of seawater whipped off the surface by wind, carried hundreds of kilometers, and deposited as a salt film. Near-coast chloride deposition rates of tens to over 100 mg Cl⁻/m²/day are routine; on a vessel crossing the tropics, every horizontal and vertical surface accumulates chloride.

The amplifier is condensation. A container crossing the equator experiences diurnal temperature swings of 20 °C or more. Warm, humid air entering the container by day condenses on the cool metal by night — "container sweat." The result is a thin electrolyte film on the bar surface, exactly the geometry that maximizes corrosion aggressiveness. In the hold of a ship the situation is worse: bilge water, ballast overspill, and the occasional seawater ingress through hatches or vents leave salt water standing where cargo should never meet it. And the wet–dry cycling that follows concentrates salts: every drying cycle raises the local chloride activity, so the corrosivity of the film increases with each cycle rather than remaining constant.

3.2 Pitting on "Corrosion-Resistant" Alloys

Pitting is the signature marine-transit failure of stainless and nickel alloys. The mechanism is well understood: chloride ions attack local weaknesses in the passive oxide film; once a pit initiates, its internal chemistry becomes autocatalytic — the pit solution acidifies and concentrates chloride, driving further dissolution while the surrounding cathodic area supports the current. A pit can penetrate a millimeter-scale wall section in a component that is otherwise untouched.

The industry's shorthand is the pitting resistance equivalent number, PREN = %Cr + 3.3(%Mo) + 16(%N), with higher values indicating greater resistance in uniform exposure:

Alloy	PREN (approximate)	Marine-transit reality
316L stainless (UNS S31603)	24–26	Pits readily in crevices; marginal in seawater at ambient temperature
Duplex 2205 (UNS S32205)	34–36	Good uniform resistance; still crevice-sensitive at contact points
Alloy 625 (UNS N06625)	50–52	Very high resistance — but not immune in tight crevices with contamination
Alloy C-276 (UNS N10276)	67–69	Near-immune to pitting in transit conditions; contamination still causes staining

The critical nuance is that PREN ranks resistance to uniform pitting; it says nothing about crevice corrosion, and crevices are what a shipment is full of. Every contact point in a bundle is a crevice: bar-to-bar contact, strap-to-bar contact, bar-to-dunnage contact, label adhesive, even the interface where one tube end rests inside another. In a crevice, the local solution depletes in oxygen and acidifies; chloride migrates in to balance charge; and the threshold for initiation drops far below what the PREN would suggest. Crevice corrosion has its own metric — critical crevice temperature (CCT) — and even alloy 625 has one. Leave 625 tubes in stagnant contact with wet dunnage for six weeks and you can produce pitting that the PREN says should be impossible.

Three transit-specific aggravators:

• Embedded iron contamination from steel slings, chains, and handling gear. Every embedded particle is a cathodic site; the alloy around it becomes the anode and pits.
• Wet wood. Green or inadequately dried dunnage holds moisture against the metal and leaches acids and tannins. Wood with moisture content above ~20% is not packaging; it is a wet compress.
• Stagnation. No washing, no flow, no drainage — corrosion products accumulate and the electrolyte concentrates. A ship's hold is a corrosion cell with free rent.

3.3 The Stainless Steel Special Case

Austenitic stainless steels (304, 316) deserve a specific warning. Their marine behavior in transit is far worse than their reputation: they are prone to chloride-induced stress corrosion cracking even at ambient temperatures when chlorides concentrate on the surface through wet–dry cycling. The classic engineering guidance cites a ~60 °C threshold for chloride SCC — but that assumes dilute, well-mixed conditions. In a condensation film that dries and re-concentrates chlorides daily, cracking of cold-worked austenitic stainless has been observed at far lower temperatures. Fasteners, springs, and heavily cold-worked fittings are the most vulnerable.

Part 4 — Stress Corrosion Cracking: When Residual Stress Meets Salt

4.1 The Fatal Trio

Stress corrosion cracking (SCC) requires three ingredients: a susceptible alloy, a tensile stress, and a specific environment. In service, the stress is usually applied load. In transit, the stress is usually residual — and residual stress is manufactured into the material on purpose.

Cold drawing, cold straightening, swaging, grinding, and surface machining all leave surface layers in tension, frequently at a substantial fraction of yield strength. A cold-drawn bar that is perfectly straight, perfectly dimensioned, and perfectly certified carries a surface residual tensile stress that the mill certificate never mentions. Add a chloride-laden condensation film and a susceptible alloy, and the trio is complete — no applied load required.

4.2 Who Cracks and Who Does Not

• Austenitic stainless (304/316): the classic chloride SCC victim. Cracking is typically transgranular, branching, and invisible until the material is machined, bent, or loaded. Warm, humid, chloride-concentrating environments are its ideal habitat — which is to say, a container crossing the tropics.
• Martensitic and precipitation-hardening stainless (410, 17-4PH): susceptible to SCC and hydrogen embrittlement in marine chloride environments, particularly at high hardness.
• High-strength nickel alloys (aged 718, K-500): far more resistant to chloride SCC than stainless steels — but not immune to hydrogen embrittlement in seawater, especially where the alloy is exposed to stagnant salt water or to cathodic protection currents from adjacent structures. K-500 in particular has a documented history of hydrogen embrittlement failures in marine service; the same physics applies if fasteners or bars sit in salt water for weeks.
• Alloy 625 and C-276: essentially immune to chloride SCC under transit conditions. This is exactly why buyers are shocked when these alloys pit in a crevice: immunity to SCC is not immunity to pitting. The two failure modes have different physics and different thresholds.

4.3 The Transit-Specific Twist

In transit, the environment does the concentrating for you. A strap tensioned across a cold-worked bar creates a sustained mechanical load; the crevice under the strap collects chloride; the wet–dry cycle concentrates it; and the residual stress from the mill's own straightening operation supplies the tension. The result is a cracking cell that requires no negligence, only time. Cracks initiated at sea can remain dormant for months, springing open when the bar is machined or loaded in service — by which point the transit damage is indistinguishable from manufacturing defect, and every party has an alibi.

The practical lesson for buyers: susceptible alloys (austenitic stainless, martensitic grades, high-strength fasteners) must be treated as chemically fragile cargo, not just physically fragile cargo — and packaging decisions should reflect the alloy's SCC and hydrogen sensitivity, not just its PREN.

Part 5 — Specialized Packaging Strategies

5.1 VCI: Volatile Corrosion Inhibitors

Chemistry. VCI compounds are organic molecules — typically amine salts, carboxylates, and azoles — with a measurable vapor pressure (of the order of 10⁻³–10⁻¹ Pa at ambient temperature). They sublimate slowly from a carrier (paper, film, foam, or emitter capsule), diffuse through the enclosed space, and adsorb onto the metal surface as a monomolecular hydrophobic film that displaces water and oxygen and raises the activation energy for corrosion. They do not form a physical barrier; they modify the electrochemistry at the surface. Different formulations serve different metals: nitrite-based products for ferrous metals, benzotriazole for copper alloys, and mixed-metal formulations for assemblies containing several metals.

Application rules — where shipments fail:

• Enclosed space is mandatory. The vapor must reach equilibrium. A torn wrap, an open crate slat, or a bundle left partially exposed lets the inhibitor escape; VCI cannot protect an open surface.
• Clean, dry surfaces first. VCI prevents corrosion; it does not cure it. Wrapping damp or contaminated material seals the problem in.
• Proximity matters. Diffusion is effective over roughly 30 cm of enclosed space; a single emitter cannot protect the far end of a 6 m crate. Sources must be distributed along the bundle.
• Time to build up. The protective atmosphere takes hours to establish; VCI is a voyage protection, not an instant fix.
• Humidity still matters. VCI works best below ~60% relative humidity; in a saturated container it slows corrosion rather than stopping it. VCI is a complement to a moisture barrier, not a substitute for one.
• Verify with indicators. VCI indicator papers change color when the protective atmosphere is present or when corrosive conditions develop; humidity indicator cards show whether the interior exceeded safe moisture levels. Both belong inside every sealed package.

5.2 Vacuum Sealing: For High-Purity and Sensitive Grades

For the most demanding material — aerospace superalloys, titanium and zirconium, mirror-finish bar, material destined for semiconductor or medical processing — the answer is to remove the atmosphere entirely. Vacuum sealing uses a multilayer barrier film (nylon/EVOH/PE laminates, often foil-laminated) heat-sealed under vacuum, frequently with desiccant and a humidity indicator sealed inside, and sometimes with nitrogen backfill after evacuation.

Vacuum sealing excludes oxygen and water vapor, prevents tarnish and oxidation of reactive surfaces, and — critically for marine transit — excludes the chloride-bearing aerosol that no amount of oil can fully exclude. Its limitations must be respected:

• One pinhole defeats the barrier. Sharp bar ends must be protected with caps or corner protectors before sealing; the film must be inspected at arrival, because a leaky "vacuum" package is worse than none — it holds moisture against the metal.
• Desiccant must be sized to the package (surface area and internal air volume, not bundle weight), and its condition verified at arrival.
• Vacuum packaging is a transit strategy, not a storage strategy. It presumes careful handling; a forklift tine is indifferent to how expensive the film was.

5.3 Wooden Crate Engineering: ISPM 15 and Beyond

Wooden crates are the load-bearing skeleton of alloy logistics, and they are regulated. ISPM 15 (International Standards for Phytosanitary Measures No. 15) applies to solid wood packaging over 6 mm thickness moving internationally: the wood must be debarked and either heat-treated (core temperature ≥ 56 °C for at least 30 minutes) or fumigated, and stamped with the IPPC mark — country code, producer code, and treatment code (HT or KD-HT). Non-compliant packaging is rejected at ports worldwide: crates are held, re-treated, or destroyed at the consignee's cost, cargo is exposed to the elements while customs deliberates, and the phytosanitary fix becomes a corrosion problem.

But ISPM 15 is a phytosanitary rule, not an engineering rule. Crate engineering is a separate discipline:

• Timber selection. Kiln-dried (KD) timber with moisture content below ~20% — ideally below 18% — is the baseline. Wet wood (even if HT-stamped) is a corrosion source: it holds moisture against the metal and leaches acids and tannins. A barrier film must separate wood from metal in any case.
• Structure. Skids (runners) sized for forklift and crane access; longitudinal stringers carrying the bundle load; cross-members spaced so no bar span is left unsupported; diagonal bracing to resist racking and handling twist. The crate must survive two cranes, a forklift, a container, and a storm — while the bundle inside must not move a millimeter.
• Blocking and cushioning. Bundles wedged, blocked, and cushioned at every contact point; foam or rubber pads between bar and frame; VCI film or oiled paper between metal and wood.
• Lashing points and marking. Rated lashing points inside the crate; weight, center of gravity, and handling instructions ("sling here," "this way up") marked on the outside. A crate that cannot be handled correctly will be handled incorrectly.
• Load distribution. Bundle weight must be spread across the container floor within floor-loading limits; a 6-ton crate concentrated on one pair of skids can punch through a container floor in heavy weather.

Part 6 — Quality Control Case Studies

6.1 Case 1: The Unboxed Inconel Tubes

A European mill shipped Alloy 625 (UNS N06625) seamless tubes — ordered to ASTM B444 for offshore pressure service — to a fabrication yard in Asia. The tubes left the mill in loose bundles: bare metal, steel strapping, chain slings at the port, loaded into an open-top container with a tarpaulin and a prayer. No VCI, no crates, no moisture barrier.

The voyage took six weeks and crossed the tropics. Every day the bundles heated in the sun and cooled at night; condensation formed and re-evaporated; the tarpaulin leaked where the strapping chafed it; salt spray found the gaps. At arrival, the tubes carried rust-colored streaks under the sling contact points, and the yard's liquid penetrant examination revealed pitting 0.1–0.3 mm deep clustered exactly where the chain links had rested — embedded iron from the slings, a crevice, chlorides, and six weeks of wet–dry cycling had done what the alloy's PREN of ~51 said could not happen.

The tubes were rejected for service: offshore pressure tubing cannot carry 0.3 mm pits in a wall that was ordered with a corrosion allowance in mind. The insurance claim was declined — carriers exclude gradual deterioration, and pitting is gradual by definition. The buyer paid for the material twice, lost the schedule, and expedited a replacement at premium freight. The packaging that would have prevented it — VCI, barrier film, crates — cost less than 2% of the material value. The unboxed shipment saved thousands and cost hundreds of thousands.

6.2 Case 2: Embedded Iron — The Invisible Inoculant

A shipment of 316L round bar for a desalination plant was lifted repeatedly with wire-rope slings that had no sleeves. The ropes embedded microscopic carbon steel particles into the bars' surfaces — invisible at discharge, invisible in the warehouse inspection. The bars sat in a coastal warehouse for months (wet season, no cover), and the embedded particles did exactly what galvanic physics predicts: each particle corroded and drove pitting in the alloy beneath it. When the bars reached the machining shop, the pits were 0.2–0.5 mm deep — deeper than the machining allowance. The batch was scrapped. The failure was classified as "storage corrosion," and the origin — the slings at the port — was never provable.

6.3 Case 3: VCI Done Wrong

A buyer specified VCI wrapping for a container of alloy bar — and got it. What the packer did not do was dry the material first or protect the VCI paper from moisture. The bars were wrapped damp, and the VCI paper — now wet — held a saturated salt-and-moisture layer directly against the metal for the entire voyage. Corrosion developed under the corrosion protection, because VCI is an electrochemical modifier, not a desiccant and not a barrier. The lesson is precise: VCI is only as good as the dryness of the envelope around it.

6.4 What These Cases Share

Every failure followed the same pattern: damage initiated at a contact point (sling, strap, dunnage, wet paper), developed over weeks of a voyage, was discovered late (at machining, at NDT, or in service), and cost multiples of the packaging savings. In each case, the packaging decision was made by someone who was not accountable for the material's performance. That is the structural flaw in alloy logistics — and it is the flaw that a disciplined supplier designs against.

Part 7 — Hangbo's Guarantee

7.1 Hangbo-Shield™ Packaging

Hangbo's proprietary packaging protocol treats the voyage as a metallurgical process step, not an administrative one. Hangbo-Shield™ is a multilayer defense, specified per alloy, per product form, and per route:

1. Surface preparation — cleaning and drying; rust-preventive oil or VCI film/paper applied in direct contact with the metal.
2. Mechanical protection — foam, spiral-wound paper, and edge/corner guards at every point where a sling, strap, or crate member could touch the metal.
3. Moisture barrier — polyethylene or foil-laminated film, heat-sealed, isolating the metal from the outside atmosphere and from wet wood.
4. Environmental monitoring — desiccant and humidity indicator cards sealed inside every bundle; VCI indicator papers where VCI is specified.
5. Engineered wooden crates — kiln-dried, ISPM 15 heat-treated and stamped, with internal bracing calculated from the bundle's weight and dimensions, cushioning at all contact points, rated lashing points, and correct handling marking.
6. Identification — heat number, grade, and bundle number marked on the packaging so that photographic records can be matched to certificates.

7.2 Photographic Traceability

A guarantee is only as good as its evidence. Hangbo documents the chain of custody photographically at every gate:

• Mill gate — surface close-ups of every bundle before packing; verification of markings and heat numbers; packaging as applied.
• Port of loading — container stuffing, lashing, blocking, and seal number recorded before the container door closes.
• Arrival — seal check, packaging condition, discharge, and unpacking documented in a condition report delivered with the material.

Every photograph is timestamped and geotagged, and the sequence is bundled into a per-shipment condition report. The commercial power of this is simple: when a claim is made, the photographs show exactly where and when damage appeared — and where it did not. A scratch visible in the mill-gate photos belongs to the mill; one that appears only in the arrival photos belongs to the voyage; and the dispute that usually costs months now costs minutes.

7.3 Lashing and Securing Audits

Before the container or hold is closed, Hangbo audits the securing plan against the voyage: lashing material condition (no rusted chains, no cut webbing), blocking and bracing sized to withstand the accelerations of a laden vessel in a storm (of the order of 0.5–0.8 g laterally and longitudinally — enough to move a multi-ton bundle across a container), and tie-down tension verified at every point. The audit report travels with the shipment, and the receiving inspection checks that the securing survived the voyage. A bundle that has not moved in transit cannot have bent itself.

Conclusion and Checklist for Receiving Inspection

The mill's quality is a necessary condition, not a sufficient one. Chemistry, certificates, and standards determine what the material is; logistics determines what the material arrives as. The most carefully specified alloy in the world is one chain-sling contact away from being a very expensive reject — and because transit damage is slow, hidden, and allocated to nobody, the buyer who does not verify at the dock is the buyer who discovers the damage in service, alone and uninsured.

The good news is that the fix is cheap and mechanical: protect deliberately, document continuously, and inspect at the gate. The following checklist turns that into practice.

The Receiving Inspection Checklist

Before opening:

• ☐ Photograph the container and crate before opening; record the seal number; note tears, dents, water stains, or evidence of re-stuffing.
• ☐ Verify the ISPM 15 stamp on all wood packaging; assess the moisture condition of the wood (damp or stained wood is a corrosion source).
• ☐ Check humidity indicator cards and VCI indicator papers — a color change that indicates high humidity or loss of protection is a finding, not a detail.
• ☐ Inspect desiccant condition; saturated desiccant means the barrier failed.

At opening:

• ☐ Photograph the unpacking sequence and keep every layer of packaging as evidence until the inspection is closed.
• ☐ Inspect the contact points first: sling marks, strap areas, bar-to-bar contact, dunnage contact, label areas — this is where pitting and cracking hide.
• ☐ Look for rust bleeding, brown staining, and embedded iron contamination; any ferromagnetic discoloration on a stainless or nickel alloy is grounds for closer examination.
• ☐ Measure scratch and gouge depth against the applicable surface requirement; check straightness with a straightedge against the A484 tolerance or your drawing — do not trust the certificate on this one.
• ☐ Check tube ends and bores for dents, ovality, kinking, and blocked bores.
• ☐ Sample the worst-looking material, not the best-looking; the batch's true condition is defined by its worst member.

After inspection:

• ☐ Document everything before signing the delivery receipt; write exceptions on the receipt.
• ☐ Notify the supplier and the insurer within contractual time limits; retain packaging and photographs as evidence.
• ☐ If damage is found, isolate the affected material, involve a third-party surveyor immediately, and do not machine or rework anything until the cause is established.
• ☐ Store the material properly: dry, off the ground, covered, with contact points protected. The voyage does not end at your dock; it ends when the material is consumed in manufacture.

In the next installment of this series, we will continue dissecting the pitfalls of importing high-performance alloys. Because in alloy trade, the most expensive surprises are the ones nobody photographed.