Hastelloy C-22HS (UNS N07022) - High Strength C-22 Alloy Supplier of Bars, Tubes & Plates | Shanghai Hangbo Alloy Group
Date: 2026年8月13日 Categories: News Views: 322
By Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier | ISO 9001:2015 | Est. 2012
Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp (Lisa): +86 13611656360
Quick Answer: What Is Hastelloy C-22HS?
Hastelloy C-22HS (UNS N07022) is a nickel-chromium-molybdenum alloy that delivers approximately double the yield strength of Hastelloy C-22 (>=540 MPa vs 285 MPa) through a unique thermal-mechanical treatment, while retaining C-22's outstanding resistance to oxidizing and reducing acids, seawater, and chloride environments. It is the material of choice for high-pressure chemical reactors, oilfield components, and heat exchanger tube sheets where both corrosion resistance and structural strength are design limits. Shanghai Hangbo Alloy Group supplies C-22HS as round bars, tubes, and plates.
Industry Pain Point: High-pressure chemical reactors (autoclaves, 10,000-15,000 psi) face the "wall thickness spiral": using C-22 at its 285 MPa yield requires extremely thick walls for pressure retention, which increases weight, cost, and fabrication difficulty. C-22HS — with 540+ MPa yield and the same corrosion envelope — permits 35-45% thinner walls, directly reducing vessel weight and weld volume while maintaining equivalent pressure ratings.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N07022 |
| Alloy Family | Ni-Cr-Mo (Hastelloy C-type) |
| Density | 8.40 g/cm3 |
| Tensile (HTMT) | >= 965 MPa (140 ksi) |
| Yield (HTMT) | >= 540 MPa (78 ksi) |
| Elongation | >= 25% |
| Hardness | 28-36 HRC |
| Key Standards | ASTM B575, B574, B622, NACE MR0175 |
Product Overview
Hastelloy C-22HS was developed by Haynes International to combine the corrosion resistance of C-22 with structural strength approaching that of precipitation-hardened alloys — without the aging schedule or weld-restriction penalties of PH alloys.
The strength mechanism is Thermo-Mechanical Treatment (TMT): controlled cold working (20-30% reduction) followed by a brief low-temperature anneal that produces a fine, stable substructure of deformed grains with enhanced dislocation density. This delivers:
- ~2x yield strength of annealed C-22 (540 vs 285 MPa).
- Retained ductility (>=25% elongation) — sufficient for pressure vessel design.
- Corrosion resistance essentially unchanged from C-22 in most media.
C-22HS vs. alternatives:
| Property | C-22HS | C-22 (annealed) | Alloy 59 |
|---|---|---|---|
| Yield Strength | >= 540 MPa | >= 285 MPa | >= 350 MPa |
| PREN | ~69 | ~65 | ~73 |
| Corrosion Envelope | C-22 class | C-22 class | Broader (higher Mo) |
| Cost | Baseline | Similar | +15-25% |
Shanghai Hangbo Alloy Group supplies C-22HS in bars, tubes, and plates in the TMT (strengthened) condition.
Executive Standards
| Product Form | ASTM |
|---|---|
| Plate, Sheet & Strip | ASTM B575 |
| Bar & Rod | ASTM B574 |
| Seamless Pipe & Tube | ASTM B622 |
| Welded Pipe | ASTM B619 |
Chemical Composition (wt.%)
| Element | Min | Max | Role |
|---|---|---|---|
| Ni | Balance | -- | Matrix |
| Cr | 20.0 | 22.5 | Oxidizing acid resistance |
| Mo | 12.5 | 14.5 | Reducing acid + pitting resistance |
| W | 2.5 | 3.5 | Pitting resistance |
| Fe | 2.0 | 6.0 | Structural |
| Co | -- | 2.5 | Impurity |
| C | -- | 0.01 | Ultra-low |
| Si | -- | 0.08 | Kept low |
| Mn | -- | 0.8 | Deoxidizer |
Mechanical & Physical Properties
Room-Temperature (TMT Condition)
| Property | Value |
|---|---|
| Tensile Strength | >= 965 MPa (140 ksi) |
| Yield Strength 0.2% | >= 540 MPa (78 ksi) |
| Elongation | >= 25% |
| Hardness | 28-36 HRC |
Elevated-Temperature (Typical)
| Temperature | Tensile (MPa) | Yield (MPa) |
|---|---|---|
| 20C | 1000 | 580 |
| 200C | 860 | 480 |
| 400C | 750 | 440 |
| 600C | 600 | 400 |
Heat Treatment
C-22HS is supplied in the TMT (thermo-mechanically treated) condition — strength is imparted by controlled cold work + stabilization anneal, not by age hardening.
Annealed condition available (for welding/fabrication): 1121C/rapid cool, then re-strengthen via TMT after fabrication.
Industry Applications
| Industry | Component | Why C-22HS? |
|---|---|---|
| Chemical Processing | High-pressure reactors, autoclaves | 2x yield = 35-45% thinner walls |
| Oil & Gas | High-pressure fittings, downhole tools | Strength + NACE MR0175 corrosion |
| Heat Exchangers | Tube sheets, high-pressure headers | Strength + seawater resistance |
| Pulp & Paper | Digester components | Corrosion + structural load |
| Flue Gas | High-temp scrubber internals | Corrosion + strength at temperature |
Quality Assurance: 7-Stage
- Raw Material: Ni, Cr, Mo, W verified by OES.
- VIM Melt: Cr +/-0.3%, Mo +/-0.2%, W +/-0.2%, C <=0.008% internal.
- Hot Working: 1150-1200C, finishing >=1000C, reduction >=4:1.
- Solution Anneal: 1121C verified.
- TMT Verification: Yield >=540 MPa and hardness 28-36 HRC per lot.
- NDE: 100% UT bars >=50mm; ET/hydro tubes. PMI every piece.
- Documentation: EN 10204 3.1 MTC. SGS/TUV/BV witness.
Frequently Asked Questions
Q1: What is C-22HS used for?
High-pressure chemical reactors, oilfield components, heat exchanger tube sheets, and any application needing C-22 corrosion resistance with 2x structural strength.
Q2: How does it achieve 2x strength?
Thermo-mechanical treatment (TMT) — controlled cold work + stabilization anneal creates a high-dislocation substructure without age hardening.
Q3: C-22HS vs C-22?
Same corrosion envelope; 2x yield strength (540 vs 285 MPa). C-22HS for pressure-critical, C-22 for fabricability-critical.
Q4: C-22HS vs Alloy 59?
59 has slightly broader corrosion (higher Mo) but lower strength (350 MPa yield). 22HS wins where strength dominates.
Q5: Is it weldable?
Yes, but welding locally anneals the TMT structure — re-strengthen welded regions by re-TMT or design using annealed properties in welds.
Q6: What is the price?
$70-110/kg EXW. Contact sales@hangboalloy.com.
Q7: Product forms?
Bars (6-200mm), tubes (OD 10-219mm), plates (3-50mm). SGS available.
Q8: Is it magnetic?
No — fully austenitic.
Q9: What is the density?
8.40 g/cm3.
Q10: Does Shanghai Hangbo ship internationally?
Yes — FOB/CIF/DAP to 40+ countries.
Q11: What standards apply?
ASTM B575 (plate), B574 (bar), B622 (tube).
Q12: What is the PREN?
~69 — excellent chloride pitting resistance.
Q13: What is the max service temperature?
~600°C continuous.
Q14: Does it meet NACE?
Yes — NACE MR0175 qualified.
Q15: How much weight does it save?
Approximately 35-45% thinner pressure-retaining walls vs annealed C-22.
Contact Shanghai Hangbo Alloy Group
| Channel | Details |
|---|---|
| Company | Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier |
| Website | www.nickel-alloy.com |
| Email (Sales) | sales@hangboalloy.com |
| Email (Technical) | hangbo@nickel-alloy.com |
| WhatsApp (Lisa) | +86 13611656360 |
| Address | Room 1508, No. 288 Shiyi Road, Baoshan District, Shanghai 200940, China |
Shanghai Hangbo Alloy Group - Complete Product Range
| Family | Available Grades |
|---|---|
| Pure Nickel | NI200, NI201, N4, N5, N6 |
| Monel | 400, 401, 404, 502, K-500, R-405 |
| Inconel | 600, 601, 617, 625, 690, 693, 706, 718, X-750, 725 |
| Incoloy | 800, 800H, 800HT, 825, 925, 926, 945, A-286, 25-6HN, 27-7MO |
| Hastelloy | C-276, C-22, C-22HS, C-2000, C-4, G-30, G-35, G-50, X, B-2, B-3, B-4, HYBRID-BC1, N |
| Super Austenitic | 904L, Alloy 28, Alloy 31, 254SMO, 20Mo-6, AL-6XN |
| Chromium-Rich | Alloy 33 |
| High-Strength Stainless | Nitronic 50, Nitronic 60, PH13-8Mo |
| Chlorination-Resistant | Alloy 45 |
| Nimonic | 75, 80A, 90, 95, 105, 115, 263 |
| Haynes | 25, 188, 214, 230, 242, 282, 556, HR-120, HR-160 |
| RA Series | RA330, RA333 |
| Precision | 1J22, 1J46, 1J50, 1J79, 1J85, 3J21, 4J32, 4J36, 4J45 |
| High-Strength | 18Ni250, 18Ni300, AerMet 100 |
| Heating | Cr20Ni80, Cr40Ni60 |
| Specialty | Alloy 20, Alloy 59, Inconel 686, 602CA |
Product Forms: Bars(6-500mm) | Tubes(OD 6-610mm) | Plates(0.1-100mm) | Forgings | Welded Pipes | Fittings | Wire(0.05-10mm) | Strip(0.02-4.0mm)
SGS/BV/TUV. Contact: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360 | www.nickel-alloy.com
