Nickel Alloy Incoloy 800 CW-H
Supply condition
UNS N08800 · EN 1.4876, X10NiCrAlTi32-21 · JIS NCF800
CW-H = cold Worked, Hard
Select for springs, thermocouple sheathing and clips needing maximum room-temperature strength; not for service above ~500 °C.
Values for the CW-H condition
Other Incoloy 800 tempers and conditions
Incoloy 800 is listed in 6 conditions; see the grade overview at Incoloy 800.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution Annealed | Pick when creep and stress-rupture life above 600 °C matter (equivalent practice to 800H heat treatment). | 215 | 550 | 48 | 125 HB | 1.7 % IACS |
ANNDefault Annealed | Standard stocked condition for fabrication, forming and welding; best ductility and corrosion resistance below ~600 °C. | 250 | 600 | 45 | 140 HB | — |
Cold Drawn + Annealed | Standard heat-exchanger and boiler tubing condition: close tolerances, bright oxide-free surface, fully soft. | 260 | 610 | 43 | 145 HB | 1.7 % IACS |
Cold Drawn + Stress Relieved | For machined or bent cold-drawn parts where residual stress and distortion must be reduced while keeping most of the cold-work strength. | 430 | 670 | 30 | 185 HB | 1.7 % IACS |
Cold drawn | Use where higher room-temperature strength, straightness and better chip control are needed for machined parts and fasteners. | 500 | 720 | 25 | 200 HB | — |
CW-HThis page Cold Worked, Hard | Select for springs, thermocouple sheathing and clips needing maximum room-temperature strength; not for service above ~500 °C. | 680 | 850 | 12 | 24 HRC | 1.7 % IACS |
What is Incoloy 800 CW-H?
Incoloy 800 CW-H is Incoloy 800 supplied in the CW-H condition — select for springs, thermocouple sheathing and clips needing maximum room-temperature strength; not for service above ~500 °C. Incoloy 800 CW-H has a yield strength of 680 MPa (98.6 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 12% and the elastic modulus is 198 GPa (28.7 Msi). Incoloy 800 CW-H has a density of 7.94 g/cm³ (0.287 lb/in³), lighter than 88% of nickel alloy grades. It melts at 1,357°C (2,475 °F). ANN is the default condition FabDigit quotes; CW-H is available on request or by drawing note.
Advantages
- Low embodied carbon — 7 kg CO₂/kg, better than 98% of nickel alloy grades
- High strength — 680 MPa (98.6 ksi), better than 81% of nickel alloy grades
- High electrical conductivity — 1.7 % IACS, better than 76% of nickel alloy grades
Limitations
- Limited ductility — 12%, worse than 83% of nickel alloy grades
- Limited service temperature — 500°C (932 °F), worse than 78% of nickel alloy grades
Incoloy 800 CW-H properties
Typical room-temperature values for Incoloy 800 CW-H; 23 are specific to this condition. Other listed values are Incoloy 800 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Incoloy 800 CW-H has a density of 7.94 g/cm³ (0.287 lb/in³), lighter than 88% of nickel alloy grades. It melts at 1,357°C (2,475 °F).
Mechanical14
Incoloy 800 CW-H has a yield strength of 680 MPa (98.6 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 12% and the elastic modulus is 198 GPa (28.7 Msi).
Thermal6
Incoloy 800 CW-H is rated for continuous service to 500°C (932 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), better than 57% of nickel alloy grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
Incoloy 800 CW-H conducts electricity at 1.7 % IACS, better than 76% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 77% of nickel alloy grades.
Sustainability4
Producing a kilogram of Incoloy 800 CW-H takes about 95 MJ of energy and emits 7 kg of CO₂ — less than 97% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
Incoloy 800 CW-H's machinability is poor (25/100, better than 76% of nickel alloy grades); weldability good (65/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Incoloy 800 CW-H
Is Incoloy 800 easy to machine?
Machine like a tough austenitic alloy: rigid setup, positive-rake sharp carbide, 20–40 m/min, heavy constant feed to cut under the work-hardened layer, flood emulsion or sulfochlorinated oil.
Can Incoloy 800 be welded?
Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (82) or ENiCrFe-2/3 filler; keep interpass below ~150 °C, low heat input, no preheat and no PWHT normally required.
Can Incoloy 800 be formed, bent or molded?
Excellent cold formability but rapid work hardening — allow ~50% more press force than 304 and interstage anneal at 980 °C; hot work 900–1200 °C, finish above 900 °C.
What surface finishes work on Incoloy 800?
Pickle in HNO3-HF or grit-blast then passivate to remove the tenacious Cr/Ti oxide before service; can be electropolished or mechanically polished, but not anodized.
Incoloy 800 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 |
|---|---|---|
| Niper ASTM B409 / UNS N08800 | 30 – 35 | 32.5 |
| Cr | 19 – 23 | 21 |
| C | ≤ 0.1 | 0.05 |
| Mn | ≤ 1.5 | 0.8 |
| Si | ≤ 1 | 0.5 |
| S | ≤ 0.02 | 0.01 |
| Cu | ≤ 0.75 | 0.3 |
| Al | 0.15 – 0.6 | 0.38 |
| Ti | 0.15 – 0.6 | 0.38 |
| Fe39.5 % min, remainder | ≥ 39.5 (balance) | — |
Incoloy 800 CW-H — frequently asked
What is Incoloy 800 CW-H used for?
Incoloy 800 CW-H is typically used for furnace muffles/baskets, heat exchanger tubing, petrochemical piping and radiant tubes. In short: cost-effective 800-family base; carburization-resistant Fe-Ni-Cr; no creep grain-size control.
What is the yield strength of Incoloy 800 CW-H?
Incoloy 800 CW-H has a typical yield strength of 680 MPa (98.6 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 81% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Incoloy 800 CW-H easy to machine?
Not especially — machinability is rated poor (25/100, better than 76% of nickel alloy grades). Machine like a tough austenitic alloy: rigid setup, positive-rake sharp carbide, 20–40 m/min, heavy constant feed to cut under the work-hardened layer, flood emulsion or sulfochlorinated oil.
Can Incoloy 800 CW-H be welded?
Yes — weldability is rated good (65/100). Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (82) or ENiCrFe-2/3 filler; keep interpass below ~150 °C, low heat input, no preheat and no PWHT normally required.
What surface finishes work on Incoloy 800 CW-H?
Pickle in HNO3-HF or grit-blast then passivate to remove the tenacious Cr/Ti oxide before service; can be electropolished or mechanically polished, but not anodized.
Can Incoloy 800 CW-H be formed, bent or molded?
Excellent cold formability but rapid work hardening — allow ~50% more press force than 304 and interstage anneal at 980 °C; hot work 900–1200 °C, finish above 900 °C.
What is the maximum service temperature of Incoloy 800 CW-H?
Incoloy 800 CW-H is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Incoloy 800-ANN and Incoloy 800 CW-H?
ANN is the default condition — standard stocked condition for fabrication, forming and welding; best ductility and corrosion resistance below ~600 °C. CW-H: select for springs, thermocouple sheathing and clips needing maximum room-temperature strength; not for service above ~500 °C. Yield strength is 250 MPa in ANN versus 680 MPa in CW-H.
Sources
- ASTM B409 / B408 / B407 (Alloy 800 plate, bar, tube) — ASTM International (2021)
- EN 10095 / DIN 17460 — X10NiCrAlTi32-21 (1.4876) — CEN (2018)
- INCOLOY alloys 800, 800H, 800HT technical bulletin — Special Metals Corporation (2004)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- GB/T 15007 (NS1101) — SAC (2017)
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.