Hastelloy C-22 (UNS N06022) Supplier – Certified Round Bar, Seamless Tube & Plate | Shanghai Hangbo Alloy Group
Date: 2026年7月14日 Categories: News Views: 272
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-22?
Hastelloy C-22 (UNS N06022 / W.Nr. 2.4602), also known as Alloy C22, is a versatile austenitic nickel-chromium-molybdenum-tungsten alloy engineered to deliver better overall corrosion resistance than the industry standard C-276. With higher chromium (20.0–22.5%) and balanced molybdenum (12.5–14.5%) and tungsten (2.5–3.5%), it offers superior pitting resistance (PREN > 50 vs C-276 at ~42), better oxidizing-media tolerance, and the same exceptional weldability. Shanghai Hangbo Alloy Group supplies Hastelloy C-22 in all standard product forms with full ASTM/ASME/EN 10204 3.1 certification and guaranteed heat-number traceability.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N06022 |
| W.Nr. | 2.4602 |
| Density | 8.69 g/cm³ (0.314 lb/in³) |
| Melting Range | 1357 – 1399 °C (2475 – 2550 °F) |
| Max Service Temp. (AQ) | ~675 °C (1250 °F) for aqueous corrosion |
| Max Service Temp. (OX) | ~1040 °C (1900 °F) for oxidation resistance |
| Tensile Strength (RT) | ≥ 690 MPa (100 ksi) |
| Yield Strength (RT, 0.2%) | ≥ 310 MPa (45 ksi) |
| Elongation (RT) | ≥ 45% |
| Thermal Conductivity | 10.1 W/m·K at 25 °C |
| PREN | > 50 (C-276 ≈ 42, SS 316L ≈ 25) |
| Key Standards | ASTM B574/B575/B622, ASME SB-574/575/622, NACE MR0175 |
The Real Problem: What Goes Wrong When You Buy the Wrong Alloy
Before you place your next order for corrosion-resistant alloy pipe or plate, consider what failure looks like in practice — and why it happens more often than you would think.
Pain Point 1: "We specified C-276 for mixed acid, but it pitted within six months."
This is a classic misapplication. Engineers specify C-276 because it is the most widely known Hastelloy, but C-276 actually contains less chromium (14.5–16.5%) than C-22 — meaning it is weaker against oxidizing environments. If your process involves nitric acid, ferric chlorides, or mixed oxidizing-reducing streams, C-276 is the wrong material. A pitted heat exchanger tube in a pharmaceutical reactor can release $200,000+ of contaminated product into the waste stream, plus weeks of downtime for retubing.
Pain Point 2: "The certified plate arrived on time, but the PMI gun showed molybdenum content 2% below spec."
Substandard chemistry is the most common form of counterfeit nickel alloy. The supplier swaps in a lower-grade Ni-Cr-Mo alloy (often an off-spec C-4 or C-2000 heat) and issues a matching MTC. The material looks identical to the eye. It corrodes identically to the eye — for the first two weeks. Then the pinholes appear. Total cost of one failed FGD absorber section: $350,000+ in replacement material and scaffolding, plus 10 days of plant downtime.
Pain Point 3: "Our order of C-22 seamless tube has been 'two weeks away' from shipping for three months."
This happens when a supplier confirms an order against stock they do not actually hold, hoping to source it from another distributor after receiving payment. The global nickel alloy tube market in 2025–2026 has consolidated significantly, and the standard lead time for non-stocked C-22 seamless tube is genuinely 8–14 weeks. Any supplier promising 3–4 weeks on a non-standard size is almost certainly not telling you the truth.
Pain Point 4: "We asked for SGS third-party inspection before shipment — the supplier went silent."
A legitimate supplier of nickel alloys welcomes independent inspection. It protects both parties. If your supplier hesitates or refuses, it is almost certainly because something in that shipment will not survive a neutral inspection — chemistry, dimensional tolerances, surface finish, or paperwork traceability. Do not proceed without it.
How Shanghai Hangbo Alloy Group Solves These Problems
| Your Pain Point | Our Solution | What This Means for You |
|---|---|---|
| Wrong alloy specified (C-276 when C-22 is needed) | Free application consultation with a metallurgist | Right alloy, first time, zero wasted procurement budget |
| Substandard chemistry / counterfeit material | 100% OES on every heat + PMI verification on every shipment + SGS/BV/TÜV optional | Verified material chemistry, traceable to the heat number on your MTC |
| "Two weeks away" delays | Live stock system; real-time availability confirmed before you pay | Order with confidence, plan your maintenance shutdown accurately |
| Third-party inspection refused | We actively encourage SGS, BV, TÜV, and Intertek pre-shipment inspection | Independent verification of quality, zero surprises at your receiving dock |
We don't compete on price. We compete on not costing you a shutdown.
Product Overview: Why C-22 Is the Engineer's Choice Since 1982
Hastelloy C-22 (UNS N06022) was developed by Haynes International specifically to address the metallurgical limitations of C-276 in oxidizing environments — and it succeeded decisively. The alloy's chemistry is a deliberate balance: chromium provides a stable passive film that resists oxidizing attack from nitric acid, ferric and cupric chlorides, wet chlorine, and chlorine dioxide, while the molybdenum-tungsten combination suppresses pitting, crevice corrosion, and stress-corrosion cracking in chloride-rich reducing environments.
The defining advantage of C-22 over C-276 is its wider corrosion envelope — meaning it remains passive in environments that oscillate between oxidizing and reducing conditions, which are common in real chemical plants. A scrubber that sees both HCl (reducing) and Cl₂ (oxidizing) in the same day will corrode C-276 at an accelerated rate, but C-22 will remain passive throughout. This broader environmental tolerance is also why C-22 has largely replaced C-276 in modern pharmaceutical and biotech process equipment, where mixed-acid clean-in-place (CIP) cycles create alternating redox conditions that most single-environment alloys cannot handle.
Key metallurgical facts:
- The ≥20.0% Cr content provides a denser, more stable passive film than C-276's 14.5–16.5% Cr
- The balanced Mo (12.5–14.5%) and W (2.5–3.5%) maintain pitting resistance while avoiding the Mo-rich µ-phase precipitation risk of higher-Mo alloys
- Ultra-low carbon (≤0.01%) ensures as-welded service without sensitization, the same advantage C-276 offers
- Controlled iron (2.0–6.0%) improves cost-effectiveness relative to Ni-Co-Mo variants
Executive Standards
| Product Form | ASTM | ASME | Additional |
|---|---|---|---|
| Round Bar / Forging | B574 / B564 | SB-574 / SB-564 | NACE MR0175 |
| Seamless Tube / Pipe | B622 | SB-622 | PED 2014/68/EU |
| Welded Pipe / Tube | B619 / B626 | SB-619 | — |
| Sheet / Plate / Strip | B575 | SB-575 | — |
| Flanges / Fittings | B564 | SB-564 | — |
Chemical Composition (wt.% per ASTM B574)
| Element | Ni | Cr | Mo | W | Fe | Co | V | Mn | Si | C | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | Bal. | 20.0 | 12.5 | 2.5 | 2.0 | — | — | — | — | — | — | — |
| Max | Bal. | 22.5 | 14.5 | 3.5 | 6.0 | 2.5 | 0.35 | 0.50 | 0.08 | 0.01 | 0.02 | 0.02 |
Critical owner's check: The chromium must be ≥ 20.0% on your MTC. If it shows 15–16% on PMI, you have been supplied C-276 or worse — reject the shipment.
Mechanical & Physical Properties
Room-Temperature (Solution-Annealed)
| Property | Minimum | Typical Hangbo Production |
|---|---|---|
| Tensile Strength | ≥ 690 MPa (100 ksi) | 760–820 MPa |
| Yield Strength (0.2%) | ≥ 310 MPa (45 ksi) | 360–400 MPa |
| Elongation | ≥ 45% | 52–58% |
| Hardness | ≤ 100 HRB | 88–95 HRB |
| Density | 8.69 g/cm³ | — |
| Melting Range | 1357–1399 °C | — |
High-Temperature Strength
| Temp (°C) | Tensile (MPa) | Yield (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 780 | 380 | 55 |
| 200 | 710 | 320 | 58 |
| 400 | 640 | 270 | 60 |
| 600 | 580 | 240 | 62 |
Heat Treatment
Hastelloy C-22 is used exclusively in the solution-annealed condition.
- Solution Annealing: 1121 °C – 1149 °C (2050 °F – 2100 °F), hold time 30–60 min per 25 mm section thickness.
- Cooling: Rapid water quench or rapid air cool. Slow cooling through 540–870 °C causes µ-phase and M₆C carbide precipitation, reducing corrosion resistance and ductility. Once precipitated, these phases cannot be re-dissolved by any field heat treatment.
- Post-Weld Heat Treatment: Not required — ultra-low carbon (≤0.010%) prevents sensitization.
- Grain Size: ASTM No. 5–7, confirmed on every Hangbo batch.
How Shanghai Hangbo Produces Hastelloy C-22
1. Round Bars (Standard Delivery: 5–15 business days from stock)
- VIM + ESR: Dual-melt ensures gas content below 30 ppm O₂ and 20 ppm N₂.
- Hot Forging: 1040–1200 °C; grain size controlled to ASTM 5–7.
- Solution Anneal + Quench: 1130 °C, water quench within 3 min.
- Finishing + 100% UT: Centerless ground to h9 (±0.03 mm); 100% UT per ASTM A388.
2. Seamless Tubes (Standard Delivery: 5–20 business days)
- Extrusion: ESR billet at 1100–1150 °C.
- Multi-pass Cold Reduction: Pilger or draw; ≤20% per pass; ±0.10 mm OD.
- Hydrogen Annealing: 1130 °C, inert atmosphere, bright finish.
- 100% NDT: ECT + hydrostatic + visual ID/OD — every single tube.
3. Plates & Sheets (Standard Delivery: 7–21 business days)
- Hot Rolling: Slab → intermediate → cold-rolled gauge.
- Full Anneal: 1130 °C → rapid quench.
- Pickling: HNO₃/HF bath; White surface finish.
- UT + Flatness + Cut: UT per ASTM A578; ≤3 mm/m flatness; waterjet cut.
Industry Applications
| Industry | Typical Component | Why C-22 vs C-276 | Hangbo Track Record |
|---|---|---|---|
| Chemical Processing | Chlorine scrubbers, mixed-acid piping | Wider oxidizing + reducing tolerance | Supplied to 6+ chemical plants in 2024–2025 |
| Pharmaceutical | CIP/SIP reactor vessels, purified water systems | No extractables; survives hot HNO₃ passivation | FDA-compliant electropolished finishes available |
| Pollution Control | FGD absorbers, flue gas ducting | Survives alternating HCl/H₂SO₄/Cl₂ condensate | Preferred by 2 major FGD OEMs we supply |
| Oil & Gas | Sour-service wellhead, H₂S-tolerant valves | NACE MR0175 approved | API 6A documentation available |
| Pulp & Paper | Bleach plant equipment (ClO₂, Cl₂) | Superior to C-276 in oxidizing bleach streams | Multiple mill installations globally |
| Nuclear | Spent fuel storage, HNO₃ dissolvers | Superior Cr content protects against transpassive attack | Can supply to RCC-M nuclear code |
Why Buyers Come Back — Real Feedback from Hangbo Customers
"We switched to Hangbo for C-22 reactor vessels after a European mill quoted 18 weeks. Hangbo had the plate in stock and shipped within 8 days. The SGS report confirmed every element within spec."
— Procurement Lead, Specialty Chemicals, Belgium
"The C-22 electropolished tubes passed our pharma water-system validation in one round. The Ra readings were consistently below 0.4 µm across all 200 tubes."
— Quality Director, Pharma Equipment OEM, India
"We had a corrosion failure in our FGD absorber with C-276 after 14 months. Our metallurgical consultant recommended switching to C-22. Hangbo not only supplied the replacement material but also provided the corrosion-rate data to justify the engineering change order. There is a real engineering knowledge behind their sales team, not just trading."
— Plant Engineer, Power Utility, USA
Quality Assurance: The 7 Checks Before Your Material Leaves Hangbo
- Incoming OES: Every heat of base metal verified against ASTM B574 before processing.
- In-Process OES: Re-checked after melting/casting; any deviation → full heat rejection.
- Ultrasonic Testing (UT): 100% of bars and plates per ASTM A388/A578 — not 10% sampling.
- Eddy Current Testing (ECT): 100% of all tubes per ASTM E309; 0.2 mm minimum defect sensitivity.
- Hydrostatic + Dimensional: All tubular products at 1.5× rated pressure; full dimensional report.
- Surface Finish (Ra): Verified on all finished surfaces; Ra ≤ 0.8 µm standard; down to 0.2 µm on request.
- MTC Issuance: EN 10204 3.1 with heat-number→product traceability; SGS / BV / TÜV / Intertek inspection available.
Frequently Asked Questions
Q1: What is Hastelloy C-22 used for?
Primarily: flue gas desulfurization systems, pharmaceutical reactor vessels, mixed-acid chemical processes, chlorine scrubbers, bleach plant equipment, and sour-service oilfield components — wherever both oxidizing and reducing corrosion attack occur in the same service.
Q2: What is the density of Hastelloy C-22?
8.69 g/cm³ (0.314 lb/in³), approximately 9% heavier per unit volume than SS 316L.
Q3: What is the maximum service temperature of Hastelloy C-22?
For aqueous corrosion resistance, ~675 °C (1250 °F). For oxidation resistance alone (no water present), up to ~1040 °C (1900 °F).
Q4: What is the melting point of Hastelloy C-22?
1357–1399 °C (2475–2550 °F).
Q5: What is the tensile strength of Hastelloy C-22?
≥ 690 MPa (100 ksi) minimum at room temperature per ASTM B574; typical Hangbo production values 760–810 MPa.
Q6: What is the yield strength of Hastelloy C-22?
≥ 310 MPa (45 ksi) minimum; typical 350–390 MPa. Modest yield strength is normal for solution-annealed solid-solution alloys and adequate for ASME pressure vessel design.
Q7: What is the elongation of Hastelloy C-22?
≥ 45% — one of the highest in the corrosion-resistant alloy class. Critical for cold-forming dish heads, reducers, and complex duct geometries.
Q8: What are the full mechanical properties of Hastelloy C-22?
UTS ≥ 690 MPa · Yield ≥ 310 MPa · Elongation ≥ 45% · Hardness ≤ 100 HRB · Density 8.69 g/cm³ · Thermal conductivity 10.1 W/m·K · Specific heat 414 J/kg·K · PREN > 50.
Q9: What heat treatment does Hastelloy C-22 require?
Solution annealing at 1121–1149 °C followed by rapid water quench or rapid air cool. No post-weld heat treatment needed.
Q10: What is the solution annealing temperature for Hastelloy C-22?
1121 °C to 1149 °C (2050 °F to 2100 °F). Hangbo records furnace charts for every batch.
Q11: How does Hastelloy C-22 compare to Hastelloy C-276?
C-22 has higher chromium (20.0–22.5% vs 14.5–16.5%), giving it significantly better resistance to oxidizing environments. C-276 has slightly more molybdenum and is marginally better in pure reducing conditions (HCl, H₂SO₄). In practice, most real-world processes involve mixed redox conditions — for which C-22 is the safer choice.
Q12: What is the price of Hastelloy C-22 per kg in 2026?
Market range: approximately $40–90 USD/kg, varying by product form, size, and order quantity. Round bar and seamless tube command higher prices. If a quote is significantly below this range, request full PMI verification before acceptance.
Q13: Is Hastelloy C-22 weldable?
Yes — excellent weldability. Use ERNiCrMo-10 filler (Alloy 22 matching). No pre-heat needed. As-welded components can go directly into corrosive service due to ultra-low carbon.
Q14: What product forms does Shanghai Hangbo supply?
Round bars (6–400 mm), hex bars, forgings, seamless tubes (OD 6–219 mm), welded pipes, plates (1–100 mm), sheets, strips, flanges, fittings, and custom-machined parts. OEM/ODM welcomed.
Q15: Does Shanghai Hangbo ship internationally?
Yes — 32 countries including Europe, North America, India, Southeast Asia, Middle East. DDP / DAP / FOB / CIF. Transit: Europe 18–25 days sea, 5–7 days air; Asia 10–15 days sea.
Q16: How do I verify that my C-22 material is genuine?
Three-step verification: (1) Check OES on MTC — Cr must be ≥ 20.0%, C ≤ 0.01%. (2) Cross-check heat number stamped on product against MTC. (3) Run XRF/PMI on arrival — chromium should be ≥ 20%; if it reads 15–16%, you received C-276 or substandard material.
Q17: Can Hangbo supply C-22 for NACE MR0175 sour service?
Yes. C-22 is listed in NACE MR0175 / ISO 15156-3 for H₂S environments. We supply with full NACE compliance documentation and hardness certification (maximum 35 HRC).
Q18: What certifications can Shanghai Hangbo provide?
ISO 9001:2015 · EN 10204 3.1 MTC · ASTM/ASME compliance · NACE MR0175 · API 6A (on request) · PED 2014/68/EU · CO · MSDS · SGS/BV/TÜV/Intertek third-party reports.
Contact Shanghai Hangbo Alloy Group
| 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 |
Response within 10 minutes during business hours — within 2 hours outside. ISO 9001:2015 certified since 2012. Serving 32 countries.
Related grades: Hastelloy C-276 (UNS N10276) | 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 | 32 Countries | No Minimum Order on Stocked Items
