Hastelloy C-276 (UNS N10276) Supplier – Certified Round Bar, Seamless Tube & Plate | Shanghai Hangbo Alloy Group
Date: 2026年7月14日 Categories: News Views: 365
By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 | Est. 2012 | Shanghai, China
Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp: +86 13611656360
Quick Answer: What Is Hastelloy C-276?
Hastelloy C-276 (UNS N10276 / W.Nr. 2.4819) is the world's most widely used corrosion-resistant superalloy — a nickel-chromium-molybdenum-tungsten alloy that resists virtually every industrial corrosive medium, from concentrated hydrochloric and sulfuric acids to wet chlorine gas and oxidizing salt solutions. With approximately 38.4% of the global Hastelloy market (by revenue, 2025), it is the go-to engineering material wherever standard stainless steels and titanium fall short. Shanghai Hangbo Alloy Group supplies Hastelloy C-276 in all primary forms with full ASTM / ASME / EN 10204 3.1 certification.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N10276 |
| W.Nr. | 2.4819 |
| Density | 8.89 g/cm³ (0.321 lb/in³) |
| Melting Range | 1325 – 1370 °C (2415 – 2500 °F) |
| Max Service Temp. | 1040 °C (1900 °F) in oxidizing atmospheres |
| Tensile Strength (RT) | ≥ 690 MPa (100 ksi) |
| Yield Strength (RT, 0.2%) | ≥ 283 MPa (41 ksi) |
| Elongation (RT) | ≥ 40% |
| Thermal Conductivity | 10.2 W/m·K at 25 °C |
| PREN | > 42 (far exceeds SS 316L at ~25) |
| Key Standards | ASTM B574/B575/B622, ASME SB-574/SB-622, AMS 5750 |
The Real Problem: Why So Many Buyers Get It Wrong
Let's be honest about what actually happens in C-276 procurement — and what it costs when things go wrong.
Pain Point 1: "It looks like C-276, but corrodes like stainless."
The market is flooded with substandard material. Suppliers substitute inferior Ni-Mo content, forge incorrect heat treatment records, or ship alloy C-4 as C-276. In aggressive HCl or FGD scrubber environments, this can cause catastrophic failure in weeks — not years. One failed heat exchanger in a pharmaceutical plant can cost $500,000+ in downtime, not counting liability.
Pain Point 2: "The mill certificate says 3.1, but the chemistry is off."
Counterfeit EN 10204 3.1 MTCs are more common than most procurement managers admit. The critical check is the heat number traceable from MTC to physical product — something that only a genuinely certified manufacturer can guarantee.
Pain Point 3: "My last supplier had a 16-week lead time."
In 2025–2026, nickel LME volatility and supply chain restructuring have made lead time a serious issue. Many Chinese suppliers "confirm" orders they cannot fulfill, then delay for months.
Pain Point 4: "I need third-party inspection, but the supplier refuses."
A legitimate supplier welcomes SGS, BV, or TÜV inspection. If your current supplier is reluctant, ask yourself why.
How Shanghai Hangbo Alloy Group Solves These Problems
We founded Shanghai Hangbo Alloy Group in 2012 specifically to address the quality gap in the Chinese special metals market. Here is what we do differently:
| Your Pain Point | Our Solution |
|---|---|
| Substandard chemistry / wrong alloy | 100% OES + PMI on every heat before shipment |
| Fake MTCs | Full heat number traceability — melt → product → MTC, all linked |
| Long lead times | Stocked in standard sizes; same-day shipping for items in stock |
| Third-party refusal | We actively encourage SGS / BV / TÜV / Intertek inspection |
| Late delivery on large orders | Dedicated order tracking + proactive status updates |
| No technical support | Metallurgical engineer on call for application selection & problem solving |
We don't compete on price alone. We compete on not costing you a shutdown.
Product Overview
Hastelloy C-276 (UNS N10276) has been the benchmark corrosion-resistant alloy for over five decades because its chemistry is uniquely balanced: chromium (14.5–16.5%) provides oxidation resistance, molybdenum (15–17%) suppresses pitting and crevice corrosion in chloride environments, and tungsten (3–4.5%) further stabilizes the passive film in strongly reducing media. Its ultra-low carbon content (≤0.01%) is not a minor detail — it is the engineering decision that allows the alloy to be used in the as-welded condition without sensitization, eliminating the cost and risk of post-weld heat treatment in field fabrications.
Where SS 316L fails, C-276 survives:
- SS 316L corrodes in HCl concentrations above 1% at room temperature. C-276 handles all concentrations up to boiling point.
- SS 316L suffers pitting in seawater above 25°C. C-276 is essentially immune.
- SS 316L cracks in chloride-bearing steam above 60°C. C-276 is immune to chloride SCC.
This is why industries that cannot afford failures — nuclear, pharmaceutical, chemical — specify C-276 as their default corrosion-resistant material.
Executive Standards
| Product Form | ASTM | ASME | AMS | W.Nr./DIN |
|---|---|---|---|---|
| Round Bar / Forging | B574 / B564 | SB-574 / SB-564 | AMS 5750 | 2.4819 |
| Seamless Tube / Pipe | B622 | SB-622 | — | 2.4819 |
| Welded Pipe / Tube | B619 / B626 | SB-619 | — | 2.4819 |
| Sheet / Plate / Strip | B575 | SB-575 | — | 2.4819 |
| Wire | B574 | — | — | 2.4819 |
| Flanges / Fittings | B564 | SB-564 | — | 2.4819 |
Chemical Composition (wt.% per ASTM B574)
Every heat is verified by 100% optical emission spectrometry (OES) at Shanghai Hangbo, with results cross-checked against the EN 10204 3.1 MTC before any product leaves our facility.
| Element | Ni | Mo | Cr | Fe | W | Co | Mn | V | Si | C | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 57.0 | 15.0 | 14.5 | 4.0 | 3.0 | — | — | — | — | — | — | — |
| Max | Bal. | 17.0 | 16.5 | 7.0 | 4.5 | 2.5 | 1.0 | 0.35 | 0.08 | 0.01 | 0.04 | 0.03 |
Critical number: C ≤ 0.01%. This is what separates true C-276 from counterfeit. Always verify this on the MTC and confirm with PMI on the product.
Mechanical & Physical Properties
Room-Temperature Properties (Solution-Annealed, per ASTM B574)
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥ 690 MPa (100 ksi) | ASTM B574 |
| Yield Strength (0.2%) | ≥ 283 MPa (41 ksi) | ASTM B574 |
| Elongation | ≥ 40% | ASTM B574 |
| Hardness | ≤ 100 HRB | — |
| Density | 8.89 g/cm³ | — |
| Melting Range | 1325–1370 °C | — |
| Thermal Conductivity | 10.2 W/m·K at 25 °C | — |
| Specific Heat | 427 J/kg·K | — |
| Electrical Resistivity | 1.30 µΩ·m | — |
High-Temperature Strength Retention
| Temp (°C) | Tensile Str. (MPa) | Yield Str. (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 760 | 360 | 52 |
| 300 | 650 | 270 | 54 |
| 600 | 560 | 210 | 57 |
| 800 | 330 | 150 | 62 |
Heat Treatment
Hastelloy C-276 is used exclusively in the solution-annealed condition.
- Solution Annealing Temperature: 1100°C – 1150°C (2012°F – 2102°F)
- Hold Time: 1–2 hours, depending on section thickness
- Cooling Method: Rapid water quench mandatory — slow cooling through the 800°C–600°C range causes μ (mu) phase and carbide precipitation, dramatically reducing ductility and corrosion resistance. This cannot be reversed by any field treatment.
- Post-Weld Heat Treatment: Generally NOT required — the low carbon content (≤0.01%) prevents sensitization in the heat-affected zone, meaning welded components can go directly into service.
- Grain Size Achieved: ASTM E112 No. 4–6, confirmed on each production batch at Shanghai Hangbo.
How Shanghai Hangbo Produces Hastelloy C-276
1. Round Bars & Forgings (Typical Delivery: 5–15 business days from stock)
- VIM + ESR Dual-Melt: Vacuum Induction Melting removes dissolved gases; Electroslag Remelting eliminates non-metallic inclusions. This two-step process is why our bars have zero internal voids on 100% UT — not a sampling claim.
- Precision Hot Forging: Controlled at 1020–1200°C to produce uniform grain structure throughout the cross-section. Oversized billet → two-pass forging → dimensional trim.
- Solution Annealing + Water Quench: Computer-controlled furnace with time-temperature chart recorded for every heat. Quench tank temperature monitored to ensure rapid cooling below 300°C within 3 minutes for max section sizes up to 250mm diameter.
- Finish + Inspection: Centerless ground to h9 tolerance (±0.04mm on diameter); 100% UT per ASTM A388; OES recheck on each bar end; surface Ra ≤ 0.8 µm.
2. Seamless Tubes & Pipes (Typical Delivery: 5–20 business days)
- ESR Billet Prep: Precisely cut and centered for hot extrusion; grain structure confirmed before processing.
- Hot Extrusion + Multi-Pass Cold Reduction: Extrude at 1080–1140°C → cold draw/pilger to final OD/WT. Each cold-work pass limited to ≤20% reduction to prevent surface cracking.
- Annealing + Bright Finish: Full solution anneal at 1120°C in hydrogen atmosphere → oxide-free, clean internal surface. Critical for applications like pharmaceutical water systems where surface cleanliness is validated.
- 100% NDT: Every tube tested — ECT (per ASTM E309) + hydrostatic (per ASTM B619) + visual ID/OD inspection. Reject rate published on request.
3. Plates, Sheets & Strips (Typical Delivery: 7–21 business days)
- Hot Rolling: Slab hot-rolled to intermediate thickness; intermediate annealing cycles prevent cracking.
- Cold Rolling + Intermediate Anneal: For gauges below 4mm; progressive cold reduction with full intermediate annealing to maintain properties.
- Solution Anneal + Pickling: Full solution anneal at 1120°C; acid-pickling in HNO₃ + HF bath to produce a clean, passive, scale-free surface (White finish).
- UT + Flatness + Cut: UT per ASTM A578 on plate > 6mm; flatness ≤ 3 mm/m guaranteed; laser or waterjet cut to custom dimensions with no HAZ.
Industry Applications — Where We Supply Right Now
| Industry | Common Component | Why C-276 Is Specified | Hangbo's Track Record |
|---|---|---|---|
| Chemical Processing | HCl distillation columns, scrubbers, heat exchangers | Only alloy resisting HCl at all concentrations | Supplying to 14 chemical plant projects in 2025 |
| Flue Gas Desulfurization | FGD absorber towers, ductwork, spray nozzles | Handles H₂SO₄ + HCl + Cl₂ combination | Preferred material for FGD OEM contractors we supply |
| Oil & Gas (Sour Service) | Wellhead equipment, Christmas trees, downhole tools | NACE MR0175 compliant for H₂S environments | API 6A documentation available |
| Pharmaceutical | Reactor vessels, agitators, piping systems | No extractables; passes FDA cleanliness validation | Ra ≤ 0.4 µm electropolished finishes available |
| Pulp & Paper | Bleach plant equipment, digester lines | Resists Cl₂, ClO₂, hypochlorite at temperature | Multiple board & kraft mill installations globally |
| Nuclear | Spent fuel reprocessing, HNO₃ dissolvers | Resists concentrated HNO₃ + radioactive media | Can supply to RCC-M and KTA nuclear requirements |
Why Buyers Come Back to Shanghai Hangbo — Client Stories
"We switched to Hangbo after two failed deliveries from another Chinese supplier. The chemistry was consistently off spec. Hangbo's OES report matched the MTC exactly — and the material has been in service for 18 months in our HCl plant without issues."
— Procurement Manager, Chemical Plant, Germany
"What impressed us most was the 48-hour response to our urgency request and the third-party inspection report from SGS. Hangbo didn't just say they could do it — they did it."
— Materials Engineer, EPC Contractor, USA
"The Ra 0.4 µm electropolished tubes passed our pharmaceutical validation protocol on the first attempt. Lead time was 12 days. We've since placed three more orders."
— Quality Director, Pharma Equipment Manufacturer, India
Quality Assurance: Our 7-Stage Zero-Defect Protocol
We are transparent about our QC process because it is one of the few in China that is independently verifiable:
- Incoming Material Verification: OES analysis on every incoming heat of base material before it enters our production line. If it doesn't match spec, we reject it — even if it delays an order.
- In-Process OES Check: Chemistry re-verified after melting, before casting.
- UT (Ultrasonic Testing): 100% of all bars and plates per ASTM A388 / ASTM A578. Zero internal defects is our shipping standard, not a goal.
- ECT (Eddy Current Testing): 100% of all tubes per ASTM E309. Surface and sub-surface defect detection to 0.2mm depth.
- Hydrostatic Pressure Testing: All tubular products tested at 1.5× rated working pressure.
- Dimensional & Surface Verification: Diameter, wall thickness, length, straightness, Ra, and visual inspection — 100% of all products, not sampling.
- MTC Issuance & Heat Traceability: EN 10204 3.1 MTC issued with full heat number link from melt → ingot → product → final dimension. SGS / BV / TÜV / Intertek third-party inspection welcome and encouraged on any order.
Frequently Asked Questions — Real Questions from Real Buyers
Q1: What is Hastelloy C-276 used for?
The most common applications in 2025–2026 are: flue gas desulfurization (FGD) absorbers, hydrochloric acid production and distillation, pharmaceutical reactor vessels, offshore oil & gas sour-service equipment, and spent nuclear fuel reprocessing. The common thread is environments that destroy standard stainless steels within weeks or months.
Q2: What is the density of Hastelloy C-276?
8.89 g/cm³ (0.321 lb/in³). This is relevant for weight calculations in vessel and skid design — a C-276 plate weighs approximately 10% more per square meter than SS 316L.
Q3: What is the maximum service temperature of Hastelloy C-276?
For oxidation resistance alone, up to 1040°C (1900°F). For aqueous corrosion resistance (the primary reason for specifying C-276), the practical limit is approximately 350°C (660°F) in most acid environments. Above this, verify with corrosion rate data for your specific medium.
Q4: What is the melting point of Hastelloy C-276?
Melting range: 1325°C to 1370°C. The range (not a single point) reflects the multi-component alloy chemistry and is normal for all nickel superalloys.
Q5: What is the tensile strength of Hastelloy C-276?
In the solution-annealed condition per ASTM B574: minimum ≥ 690 MPa (100 ksi) at room temperature. Typical production values from our recent heats: 760–810 MPa. At 300°C: approximately 650 MPa.
Q6: What is the yield strength of Hastelloy C-276?
Minimum ≥ 283 MPa (41 ksi) at room temperature per ASTM B574. Typical: 340–380 MPa. The relatively low yield strength (compared to Inconel 718) is normal for solution-annealed solid-solution alloys and is compatible with ASME pressure vessel allowable stress calculations.
Q7: What is the elongation of Hastelloy C-276?
Minimum ≥ 40% — one of the highest elongations of any corrosion-resistant alloy. This ductility is critical for forming complex shapes (dish heads, reducer cones) without cracking during cold forming.
Q8: What are the full mechanical properties of Hastelloy C-276?
UTS ≥ 690 MPa · Yield ≥ 283 MPa · Elongation ≥ 40% · Hardness ≤ 100 HRB · Density 8.89 g/cm³ · Thermal conductivity 10.2 W/m·K · Specific heat 427 J/kg·K · Electrical resistivity 1.30 µΩ·m · PREN > 42.
Q9: What heat treatment does Hastelloy C-276 require?
Solution annealing at 1100°C–1150°C followed by rapid water quench. The key word is "rapid" — a slow cool through the 600–800°C range causes irreversible μ-phase precipitation that destroys corrosion resistance. No post-weld heat treatment is needed due to the ultra-low carbon content.
Q10: What is the solution annealing temperature for Hastelloy C-276?
1100°C to 1150°C (2012°F to 2102°F). Shanghai Hangbo records time-temperature charts for every annealing cycle and includes them with the MTC on request.
Q11: How does Hastelloy C-276 compare to Hastelloy C-22?
Both are Ni-Cr-Mo-W alloys. C-22 has higher chromium (22% vs 16%) and offers better resistance to oxidizing environments like nitric acid and ferric chlorides. C-276 is generally superior in reducing environments (HCl, H₂SO₄). For mixed or uncertain environments, C-22 is often the safer choice. For confirmed HCl-dominated service, C-276 is typically preferred.
Q12: What is the price of Hastelloy C-276 per kg in 2025–2026?
As of mid-2026, market pricing ranges approximately $35–$85 USD/kg depending on product form, size, certification level, and order quantity. Round bar and seamless tube command higher per-kg prices than plate. If a quote is significantly below this range, ask for a full MTC with traceable heat numbers and insist on PMI verification — it may not be genuine C-276. Contact us at sales@hangboalloy.com for a transparent, market-rate quotation.
Q13: Is Hastelloy C-276 weldable?
Yes — and this is one of its greatest advantages. The ultra-low carbon (≤0.01%) prevents sensitization during welding, allowing as-welded components to be put directly into corrosive service. Recommended filler metal: ERNiCrMo-4 (matching composition). No pre-heat required. Post-weld solution anneal is only needed for components that will experience stress-corrosion conditions in stagnant chloride at high temperature.
Q14: What product forms does Shanghai Hangbo Alloy Group supply?
Round bars (6–400 mm), hex bars, forgings, seamless tubes (OD 6–219 mm, any wall), welded pipes, plates (1–100 mm), sheets, strips, flanges (all ANSI ratings), fittings, and custom-machined components. Tell us the shape and we will find the solution.
Q15: Does Shanghai Hangbo ship internationally?
Yes. We export to 32 countries across Europe, North America, Southeast Asia, the Middle East, India, and Australia. We support DDP, DAP, FOB (Shanghai), CIF incoterms. Typical transit time: Europe 18–25 days sea, 5–7 days air; North America 20–28 days sea; India/Southeast Asia 10–15 days sea.
Q16: How do I verify that the material I received is genuine C-276?
Three steps: (1) Check OES chemistry on the MTC — key numbers are Mo 15–17%, C ≤ 0.01%. (2) Cross-check the heat number stamped/etched on the physical product against the MTC — it must match exactly. (3) Perform a PMI (Positive Material Identification) test using an XRF gun to verify the molybdenum content — this is the fastest on-site verification method. Shanghai Hangbo provides XRF test reports on request for every delivery.
Q17: Can you supply C-276 for NACE MR0175 sour service?
Yes. Hastelloy C-276 is listed in NACE MR0175 / ISO 15156-3 for use in H₂S-containing oilfield environments. We supply with full NACE compliance documentation, including hardness testing (maximum 35 HRC) and chemical composition verification per the NACE standard requirements.
Q18: What certifications can Hangbo provide?
ISO 9001:2015 quality certificate · EN 10204 3.1 Mill Test Certificate · ASTM / ASME compliance statement · NACE MR0175 compliance documentation · API 6A PSL traceability (on request) · PED 2014/68/EU pressure equipment declaration · SGS / BV / TÜV / Intertek third-party inspection (arranged by us or by buyer) · CO (Certificate of Origin) · MSDS/SDS.
Ready to Talk? — Get a Response in Under 10 Minutes
Whether you have a drawing-based inquiry, an urgent replacement order, or a specification question at midnight, we respond within 10 minutes during business hours — and within 2 hours outside business hours. This is not a marketing claim; it is how we have retained clients across 32 countries since 2012.
| Channel | Details |
|---|---|
| Website | www.nickel-alloy.com |
| Email (Sales) | sales@hangboalloy.com |
| Email (Technical) | hangbo@nickel-alloy.com |
| WhatsApp / Phone | +86 13611656360 |
| Skype | +86 13611656360 |
| Address | Shanghai, China |
Typical next steps after you contact us:
① You send us your requirement (drawing, spec, PO quantity) → ② We confirm stock or lead time within 10 min → ③ We issue a formal quotation within 2 hours → ④ On your approval, we arrange SGS pre-shipment inspection if required → ⑤ Shipment with full documentation.
Related grades: Hastelloy C-22 (UNS N06022) | Hastelloy G-30 (UNS N06030) | Hastelloy B-2 (UNS N10665) | Hastelloy B-3 (UNS N10675) | Hastelloy X (UNS N06002) | Inconel 625 (UNS N06625)
Shanghai Hangbo Alloy Group Co., Ltd. — Founded 2012 | ISO 9001:2015 | Specialist in Ni-Cr-Mo Corrosion-Resistant Alloys | Serving 32 Countries | No Minimum Order on Stocked Items
