Hastelloy C-276 Welding Guide - Filler, Parameters & Crack Prevention
Date: 2026年8月16日 Categories: News Views: 207
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: How Do You Weld Hastelloy C-276 Without Cracks?
Hastelloy C-276 (UNS N10276) is weldable by GTAW, GMAW, and SMAW using ERNiCrMo-4 filler (AWS A5.14) with three critical rules: (1) keep interpass below 93C, (2) limit heat input to 1.0-2.0 kJ/mm, (3) use stringer beads — never weave. These rules prevent the molybdenum-rich microsegregation in the HAZ that causes microfissuring. Post-weld heat treatment is NOT required for C-276 — it is used in the as-welded condition. Shanghai Hangbo Alloy Group supplies C-276 in bars, tubes, plates, and welding wire.
The Filler Rule
| Process | Filler (AWS) | Notes |
|---|---|---|
| GTAW (TIG) | ERNiCrMo-4 | Preferred — cleanest |
| GMAW (MIG) | ERNiCrMo-4 | Pulse mode recommended |
| SMAW (Stick) | ENiCrMo-4 | Limit to repair work |
Never substitute 625 or 316 filler — weld metal will corrode preferentially.
Critical Welding Parameters
| Parameter | Specification |
|---|---|
| Preheat | None required |
| Interpass Temp | <= 93C (200F) |
| Heat Input | 1.0-2.0 kJ/mm |
| Bead Technique | Stringer beads only |
| Shielding | Argon (GTAW), Ar+25%He for thick |
| Back-purging | Required for tube/pipe |
| Post-weld HT | NOT required |
Why C-276 Cracks If You Weave
C-276's high molybdenum (16%) segregates at the dendrite boundaries of wide weaved beads, forming low-melting Mo-rich eutectics that microfissure under solidification stress. Stringer beads with low heat input minimize this segregation. This is THE most common field failure in C-276 fabrication.
C-276 vs C-22 (Quick Table)
| Property | C-276 | C-22 |
|---|---|---|
| Mo % | 16 | 13 |
| PREN | ~69 | ~65 |
| Oxidizing acid | Good | Better |
| Reducing acid | Excellent | Excellent |
| Weldability | Good | Slightly better |
| Price | Baseline | Similar |
Price Guide (2026, EXW)
| Form | Price |
|---|---|
| Round Bar Ø25-100 mm | \$55-85/kg |
| Seamless Tube | \$70-105/kg |
| Plate 6-25 mm | \$60-90/kg |
| Welding Wire Ø2.4 mm | \$75-110/kg |
Heat Treatment (If Ever Required)
C-276 is used as-welded. If the customer insists on PWHT (rare), use solution anneal at 1121C / rapid cool — never stress-relieve in the 649-760C range (precipitates sigma and mu phases, destroying corrosion resistance).
Why Buy From Shanghai Hangbo?
- C-276 bars/tubes/plates + ERNiCrMo-4 wire in stock.
- EN 10204 3.1 MTC per heat.
- NACE MR0175 documentation available.
- SGS/TUV/BV inspection.
- 40+ countries shipped.
Contact & Complete Product Range
Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier
Email: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360 | www.nickel-alloy.com
All Grades
Ni: NI200-N6 | Monel: 400-502, K-500, R-405 | Inconel: 600-740H, X-750, 725 | Incoloy: 800-27-7MO | Hastelloy: C-276-HYBRID-BC1, N | Super Austenitic: 904L-AL-6XN | Chromium-Rich: Alloy 33 | High-Strength Stainless: Nitronic 50/60, PH13-8Mo | Chlorination: Alloy 45 | Nimonic: 75-263 | Haynes: 25-HR-160 | RA: 330/333 | Precision: 1J22-4J45 | High-Strength: 18Ni250-AerMet100 | Heating: Cr20Ni80/60 | Specialty: Alloy 20-602CA
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. www.nickel-alloy.com
