Nickel Alloy N06255 CD+SR
Supply condition
UNS N06255
CD+SR = cold worked and stress relieved
Cold-drawn bar/tube given a low-temperature stress relief to cut residual stress and SCC risk while keeping most of the cold-work strength.
Values for the CD+SR condition
Other N06255 tempers and conditions
N06255 is listed in 5 conditions; see the grade overview at N06255.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot finished and solution annealed | Choose for heavy sections, forged valve bodies and flanges where hot working precedes the final solution anneal. | 340 | 730 | 50 | 185 HB | 1.4 % IACS |
SADefault Solution annealed | Standard stocked condition for plate, sheet, tube and bar in corrosion service — maximum corrosion resistance and ductility. | 355 | 760 | 55 | 195 HB | — |
As-welded deposit | Property set for undiluted weld metal / weld overlay used without post-weld solution anneal in chemical-process fabrication. | 450 | 740 | 38 | 210 HB | 1.3 % IACS |
CD+SRThis page Cold worked and stress relieved | Cold-drawn bar/tube given a low-temperature stress relief to cut residual stress and SCC risk while keeping most of the cold-work strength. | 640 | 900 | 28 | 28 HRC | 1.4 % IACS |
Cold drawn | Use where higher strength, closer tolerance and better surface are needed and full annealed corrosion performance is not mandatory. | 700 | 950 | 25 | 30 HRC | 1.4 % IACS |
What is N06255 CD+SR?
N06255 CD+SR is N06255 supplied in the CD+SR condition — cold-drawn bar/tube given a low-temperature stress relief to cut residual stress and SCC risk while keeping most of the cold-work strength. N06255 CD+SR has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi). N06255 CD+SR has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,330°C (2,426 °F). SA is the default condition FabDigit quotes; CD+SR is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 80/100, better than 97% of nickel alloy grades
- Good corrosion resistance — 89/100, better than 84% of nickel alloy grades
- High strength — 640 MPa (92.8 ksi), better than 81% of nickel alloy grades
Limitations
- Limited service temperature — 480°C (896 °F), worse than 82% of nickel alloy grades
N06255 CD+SR properties
Typical room-temperature values for N06255 CD+SR; 23 are specific to this condition. Other listed values are N06255 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
N06255 CD+SR has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,330°C (2,426 °F).
Mechanical14
N06255 CD+SR has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
N06255 CD+SR is rated for continuous service to 480°C (896 °F). It conducts heat at 10 W/m·K (5.78 BTU/hr·ft·°F), worse than 88% of nickel alloy grades. Thermal expansion is 12.4 µm/m·K (6.89 µin/in·°F).
Electrical3
N06255 CD+SR conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (89/100), better than 84% of nickel alloy grades.
Sustainability4
Producing a kilogram of N06255 CD+SR takes about 140 MJ of energy and emits 13 kg of CO₂ — less than 81% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
N06255 CD+SR's machinability is poor (25/100, better than 76% of nickel alloy grades); weldability very good (75/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N06255 CD+SR
Is N06255 easy to machine?
Treat like C-276/alloy 22: rigid setup, positive-rake sharp carbide or ceramic-free tooling, low speed / heavy positive feed to cut under the work-hardened skin, flood high-pressure coolant, never dwell.
Can N06255 be welded?
GTAW/GMAW with matching low-carbon Ni-Cr-Mo filler or autogenous on thin gauge; low heat input, interpass below ~120 °C, no preheat and normally no PWHT — full solution anneal only if maximum corrosion resistance is required.
Can N06255 be formed, bent or molded?
Very ductile but strongly work-hardening; allow larger bend radii and higher press tonnage than stainless, and interstage-anneal (solution anneal + quench) for deep draws or multi-stage forming.
What surface finishes work on N06255?
Pickle (HNO₃-HF) or grind off all weld/heat-tint oxides before service, then passivate; no anodizing — mechanical polish or electropolish for high-purity/CIP surfaces.
N06255 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 |
|---|---|---|
| Crindicative | 22 – 26 | 24 |
| Moindicative | 6 – 9 | 7 |
| Feindicative residual/alloy iron | ≤ 5 | — |
| Clow-carbon design to limit sensitization | ≤ 0.03 | — |
| Siindicative | ≤ 0.08 | — |
| Mnindicative | ≤ 1 | — |
| Pindicative | ≤ 0.03 | — |
| Sindicative | ≤ 0.02 | — |
| Nibalance; indicative Ni-Cr-Mo corrosion-alloy analysis — confirm against the governing ASTM/ASME specification and mill certificate | balance | — |
N06255 CD+SR — frequently asked
What is N06255 CD+SR used for?
N06255 CD+SR is typically used for chemical reactors, sulfuric/phosphoric acid equipment, flue gas systems and marine and offshore components. In short: oxidizing and reducing service; C-276 class corrosion resistance; low machinability, high cost.
What is the yield strength of N06255 CD+SR?
N06255 CD+SR has a typical yield strength of 640 MPa (92.8 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 81% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is N06255 CD+SR easy to machine?
Not especially — machinability is rated poor (25/100, better than 76% of nickel alloy grades). Treat like C-276/alloy 22: rigid setup, positive-rake sharp carbide or ceramic-free tooling, low speed / heavy positive feed to cut under the work-hardened skin, flood high-pressure coolant, never dwell.
Can N06255 CD+SR be welded?
Yes — weldability is rated very good (75/100). GTAW/GMAW with matching low-carbon Ni-Cr-Mo filler or autogenous on thin gauge; low heat input, interpass below ~120 °C, no preheat and normally no PWHT — full solution anneal only if maximum corrosion resistance is required.
What surface finishes work on N06255 CD+SR?
Pickle (HNO₃-HF) or grind off all weld/heat-tint oxides before service, then passivate; no anodizing — mechanical polish or electropolish for high-purity/CIP surfaces.
Can N06255 CD+SR be formed, bent or molded?
Very ductile but strongly work-hardening; allow larger bend radii and higher press tonnage than stainless, and interstage-anneal (solution anneal + quench) for deep draws or multi-stage forming.
What is the maximum service temperature of N06255 CD+SR?
N06255 CD+SR is rated for continuous use to about 480°C (896 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between N06255-SA and N06255-CD?
SA is the default condition — standard stocked condition for plate, sheet, tube and bar in corrosion service — maximum corrosion resistance and ductility. CD: use where higher strength, closer tolerance and better surface are needed and full annealed corrosion performance is not mandatory. Yield strength is 355 MPa in SA versus 700 MPa in CD.
Sources
- ASTM B575 — Ni-Cr-Mo Alloy Plate, Sheet and Strip — ASTM International (2022)
- ASTM B574 / B622 / B626 — Ni-Cr-Mo Alloy Rod, Seamless Pipe & Tube, Welded Tube — ASTM International (2021)
- ASTM B564 — Nickel Alloy Forgings — ASTM International (2022)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys — ASM International (2000)
- UNS Metals & Alloys in the Unified Numbering System — SAE/ASTM (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.