Stainless Steel Alloy 926 CW-HT
Supply condition
UNS N08926 · ASTM A240/B625 · EN 1.4529, X1NiCrMoCuN25-20-7 · also Cronifer 1925hMo
CW-HT = heavily cold worked
Springs, screens, wire cloth and fasteners for aggressive chloride media where high strength plus 6Mo corrosion resistance is required.
Values for the CW-HT condition
Other Alloy 926 tempers and conditions
Alloy 926 is listed in 3 conditions; see the grade overview at Alloy 926.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed | Standard supply condition for plate, sheet, tube, pipe and fittings — maximum corrosion resistance and ductility; use unless cold-worked strength is needed. | 360 | 700 | 45 | 180 HB | — |
Cold drawn | Choose for shafts, fasteners, pump/valve trim and instrument tubing needing higher yield strength and tight tolerance; slightly reduced ductility. | 620 | 850 | 25 | 26 HRC | — |
CW-HTThis page Heavily cold worked | Springs, screens, wire cloth and fasteners for aggressive chloride media where high strength plus 6Mo corrosion resistance is required. | 1,000 | 1,250 | 8 | 38 HRC | 1.7 % IACS |
What is Alloy 926 CW-HT?
Alloy 926 CW-HT is Alloy 926 supplied in the CW-HT condition — springs, screens, wire cloth and fasteners for aggressive chloride media where high strength plus 6Mo corrosion resistance is required. Alloy 926 CW-HT has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,250 MPa (181 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 8% and the elastic modulus is 200 GPa (29 Msi). Alloy 926 CW-HT has a density of 8.1 g/cm³ (0.293 lb/in³), heavier than 99% of stainless steel grades. It melts at 1,320°C (2,408 °F). SA is the default condition FabDigit quotes; CW-HT is available on request or by drawing note.
Advantages
- High strength — 1,000 MPa (145 ksi), better than 98% of stainless steel grades
- Good corrosion resistance — 83/100, better than 91% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
Limitations
- Limited ductility — 8%, worse than 99% of stainless steel grades
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- High embodied carbon — 6.5 kg CO₂/kg, worse than 93% of stainless steel grades
Alloy 926 CW-HT properties
Typical room-temperature values for Alloy 926 CW-HT; 23 are specific to this condition. Other listed values are Alloy 926 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
Alloy 926 CW-HT has a density of 8.1 g/cm³ (0.293 lb/in³), heavier than 99% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Mechanical15
Alloy 926 CW-HT has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,250 MPa (181 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 8% and the elastic modulus is 200 GPa (29 Msi).
Thermal5
Alloy 926 CW-HT is rated for continuous service to 300°C (572 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades. Thermal expansion is 15.8 µm/m·K (8.78 µin/in·°F).
Electrical3
Alloy 926 CW-HT conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (83/100), better than 91% of stainless steel grades.
Sustainability4
Producing a kilogram of Alloy 926 CW-HT takes about 95 MJ of energy and emits 6.5 kg of CO₂ — more than 96% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
Alloy 926 CW-HT's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability good (60/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Alloy 926 CW-HT
Is Alloy 926 easy to machine?
Gummy and highly work-hardening: use rigid setups, sharp positive-rake carbide, 25–40 % of 316L cutting speeds, heavy feeds to stay under the hardened skin, and flood high-lubricity coolant.
Can Alloy 926 be welded?
GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3/-4, ERNiCrMo-13) to prevent Mo segregation in the weld; no preheat, keep interpass below ~150 °C, low heat input, argon backing, no post-weld heat treatment.
Can Alloy 926 be formed, bent or molded?
Cold forms well but needs roughly twice the press force of 316L and generous springback allowance; hot work 1150–1200 °C with immediate solution anneal at 1100–1180 °C and rapid quench.
What surface finishes work on Alloy 926?
Pickle (HNO3-HF) and passivate per ASTM A967 after welding or heat tint to restore full pitting resistance; polishes to a bright finish; not anodised, and iron contamination from carbon-steel tooling must be avoided.
Alloy 926 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Clow carbon for as-welded corrosion resistance | ≤ 0.02 | 0.01 |
| Si | ≤ 0.5 | 0.3 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.03 | — |
| S | ≤ 0.01 | — |
| Cr | 19 – 21 | 20 |
| Niaustenite stability, SCC resistance | 24 – 26 | 25 |
| Mopitting/crevice resistance | 6 – 7 | 6.5 |
| Cuimproves sulphuric/phosphoric acid resistance | 0.5 – 1.5 | 1 |
| Nraises yield strength and PREN | 0.15 – 0.25 | 0.2 |
| Feremainder, ≈ 46 % | balance | — |
Alloy 926 CW-HT — frequently asked
What is Alloy 926 CW-HT used for?
Alloy 926 CW-HT is typically used for FGD scrubber systems, seawater and offshore equipment, pulp/paper bleach plants and sour gas and chemical processing. In short: 6.5 % Mo superaustenitic; upgrade from 904L; near nickel-alloy corrosion resistance.
What is the yield strength of Alloy 926 CW-HT?
Alloy 926 CW-HT has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,250 MPa (181 ksi) — stronger than 98% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is Alloy 926 CW-HT easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Gummy and highly work-hardening: use rigid setups, sharp positive-rake carbide, 25–40 % of 316L cutting speeds, heavy feeds to stay under the hardened skin, and flood high-lubricity coolant.
Can Alloy 926 CW-HT be welded?
Yes — weldability is rated good (60/100). GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3/-4, ERNiCrMo-13) to prevent Mo segregation in the weld; no preheat, keep interpass below ~150 °C, low heat input, argon backing, no post-weld heat treatment.
What surface finishes work on Alloy 926 CW-HT?
Pickle (HNO3-HF) and passivate per ASTM A967 after welding or heat tint to restore full pitting resistance; polishes to a bright finish; not anodised, and iron contamination from carbon-steel tooling must be avoided.
Can Alloy 926 CW-HT be formed, bent or molded?
Cold forms well but needs roughly twice the press force of 316L and generous springback allowance; hot work 1150–1200 °C with immediate solution anneal at 1100–1180 °C and rapid quench.
What is the maximum service temperature of Alloy 926 CW-HT?
Alloy 926 CW-HT is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Alloy 926-SA and Alloy 926 CW-HT?
SA is the default condition — standard supply condition for plate, sheet, tube, pipe and fittings — maximum corrosion resistance and ductility; use unless cold-worked strength is needed. CW-HT: springs, screens, wire cloth and fasteners for aggressive chloride media where high strength plus 6Mo corrosion resistance is required. Yield strength is 360 MPa in SA versus 1,000 MPa in CW-HT.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM B625 — UNS N08926 and Related Alloys Plate, Sheet and Strip — ASTM International (2022)
- ASTM B649 / B676 / B677 — N08926 bar, tube and pipe — ASTM International (2022)
- EN 10088-1/-2 — Stainless steels, grade 1.4529 X1NiCrMoCuN25-20-7 — CEN (2014)
- Cronifer 1925 hMo / Alloy 926 (N08926) alloy data sheet — VDM Metals / ThyssenKrupp VDM (2020)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.