Hastelloy W (UNS N10004) - Heat Treatable Ni-Mo-Cr Alloy Supplier of Bars, Tubes & Welding | Shanghai Hangbo Alloy Group
Date: 2026年8月14日 Categories: News Views: 258
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 W?
Hastelloy W (UNS N10004) is an early-generation nickel-molybdenum-chromium alloy with a unique distinction: it is heat treatable (age-hardenable) through a simple aging cycle, allowing yield strength to be raised from ~320 MPa to over 600 MPa while retaining excellent resistance to hydrochloric acid, acetic acid, and reducing environments. It is also the historically standard filler metal for welding B-series alloys. Shanghai Hangbo Alloy Group supplies Hastelloy W as round bars, tubes, and welding filler.
Industry Pain Point: Welders joining Hastelloy B-2/B-3 piping face a specific challenge: the weld filler must match the base metal's corrosion resistance without cracking. Hastelloy W — developed as the original B-series welding filler — provides the needed Mo-rich chemistry with lower cracking tendency, and remains specified for repair welding of B-family equipment. Its dual role (structural bar + welding filler) makes it a staple in chemical plant maintenance inventories.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N10004 |
| Density | 9.10 g/cm3 |
| Melting Range | 1290-1350C |
| Tensile (Aged) | >= 690 MPa (100 ksi) |
| Yield (Aged) | >= 600 MPa (87 ksi) |
| Elongation (Aged) | >= 20% |
| Key Standards | ASTM B333/B335 |
Product Overview
Hastelloy W is one of the original Hastelloy grades (introduced in the 1950s), noteworthy for combining Ni-Mo-Cr chemistry with precipitation hardening — a capability almost unique among corrosion-resistant nickel alloys. The ~24% molybdenum provides B-series-class resistance to HCl and reducing acids, while chromium (~5%) offers limited oxidizing tolerance.
The age-hardening mechanism: Unlike most Ni-Mo alloys (which are strictly solution-strengthened), Hastelloy W responds to aging at 650-870°C through the precipitation of Ni₄Mo-type ordered phases, raising yield strength from ~320 to 600+ MPa.
Modern roles:
- Structural: High-strength fasteners, shafts, and springs in acid service.
- Welding filler: The traditional filler for B-2 and other B-series alloys (ERNiMo-3 equivalent), valued for crack resistance in Mo-rich welds.
Shanghai Hangbo Alloy Group supplies Hastelloy W in bars, tubes, and welding wire.
Executive Standards
| Product Form | ASTM |
|---|---|
| Bar & Rod | ASTM B335 |
| Plate & Sheet | ASTM B333 |
| Welding Filler | ERNiMo-3 (AWS A5.14) |
Chemical Composition (wt.%)
| Element | Min | Max | Role |
|---|---|---|---|
| Ni | Balance | -- | Matrix |
| Mo | 22.0 | 26.0 | HCl/reducing acid resistance |
| Cr | 4.0 | 6.0 | Minor oxidizing tolerance |
| Fe | 4.0 | 7.0 | Structural |
| C | -- | 0.05 | Control |
| Si | -- | 1.0 | Deoxidizer |
| Mn | -- | 1.0 | Deoxidizer |
Mechanical Properties
| Condition | Tensile (MPa) | Yield (MPa) | Elongation (%) |
|---|---|---|---|
| Solution-Annealed | 690-790 | 320-380 | 35-40 |
| Aged (760C/4h) | >= 690 | >= 600 | >= 20 |
Heat Treatment
Solution Anneal: 1040-1095C (1900-2000F), water quench.
Age: 650-870C (1200-1600F), 2-8 hours, air cool — precipitation hardens to 600+ MPa yield.
Industry Applications
| Industry | Component | Why Hastelloy W? |
|---|---|---|
| Chemical | Acid service fasteners, shafts | High strength + HCl resistance |
| Chemical Plant Maintenance | B-series weld repairs | The traditional B-2 filler metal |
| Petrochemical | Reducing acid processing | Ni-Mo corrosion + strength |
| Fittings | Acid-service springs, valve trim | Age-hardened strength |
Quality Assurance: 7-Stage
- Raw Material: Ni, Mo verified by OES.
- Melt: Mo +/-0.3%, C <=0.04% internal.
- Hot Working: 1150-1200C, finishing >=1000C.
- Solution Anneal: 1040-1095C verified.
- Aging Verification: Yield >=600 MPa when aged; tensile per lot.
- NDE: 100% UT bars >=50mm. PMI every piece.
- Documentation: EN 10204 3.1 MTC. SGS/TUV/BV witness.
Frequently Asked Questions
Q1: What is Hastelloy W used for?
High-strength fasteners and shafts in HCl/reducing acid service, plus the traditional welding filler for B-series alloys.
Q2: W vs B-2?
W: age-hardenable (600 MPa yield), moderate Cr. B-2: higher HCl resistance but strictly solution-strengthened (~350 MPa). W for strength, B-2 for maximum corrosion.
Q3: Why is it used as welding filler?
Its Mo-rich chemistry matches B-series corrosion resistance with lower hot-cracking tendency than pure Mo filler.
Q4: Is it weldable?
Yes — and it is itself a welding filler alloy.
Q5: What is the price?
$55-90/kg EXW. Contact sales@hangboalloy.com.
Q6: Product forms?
Bars (6-150mm), tubes, welding wire (ERNiMo-3). SGS available.
Q7: What heat treatment?
Solution 1040-1095°C; age 650-870°C for hardening.
Q8: What is the density?
9.10 g/cm3.
Q9: Does Shanghai Hangbo ship internationally?
Yes — FOB/CIF/DAP to 40+ countries.
Q10: What standards apply?
ASTM B335 (bar), B333 (plate), AWS A5.14 (filler).
Q11: Is it magnetic?
Non-magnetic.
Q12: What is the max service temperature?
~500°C continuous (aged condition).
Q13: Can it be cold-worked?
Yes, moderately; aging after cold work further increases strength.
Q14: Is it used for new B-series equipment?
Less common now (B-3/B-4 dominate), but W remains the repair-filler standard.
Q15: How does aged strength compare?
Aged yield 600+ MPa vs 320 MPa annealed — nearly 2x.
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, 740H, X-750, 725 |
| Incoloy | 800, 800H, 800HT, 825, 907, 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, W, 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, 4J29, 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
