Stainless Steel S35125 CD-A
Heat-treated state
UNS S35125
Choose for seamless tubing and precision bar needing tight tolerance and smooth surface with fully annealed high-temperature properties.
Values for the CD-A condition
Other S35125 tempers and conditions
S35125 is listed in 4 conditions; see the grade overview at S35125.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed | Standard supply condition for plate, tube and bar; maximum ductility, carbides in solution, best creep and oxidation behaviour. | 270 | 600 | 45 | 165 HB | — |
CD-AThis page cold drawn and solution annealed tube/bar | Choose for seamless tubing and precision bar needing tight tolerance and smooth surface with fully annealed high-temperature properties. | 290 | 620 | 42 | 175 HB | 1.7 % IACS |
As-welded deposit | Reference condition for weld-joint design; joint strength approaches base metal but weld-metal ductility and creep life are lower. | 300 | 570 | 30 | 180 HB | 1.7 % IACS |
Cold worked | Limited-availability hard temper for room-temperature strength in springs and fasteners; not recommended above ~550 °C because cold work recovers. | 590 | 800 | 20 | 22 HRC | 1.7 % IACS |
What is S35125 CD-A?
S35125 CD-A is S35125 heat treated to CD-A — choose for seamless tubing and precision bar needing tight tolerance and smooth surface with fully annealed high-temperature properties. S35125 CD-A has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 195 GPa (28.3 Msi). S35125 CD-A has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,330°C (2,426 °F). SA is the default condition FabDigit quotes; CD-A is available on request or by drawing note.
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- High embodied carbon — 6.8 kg CO₂/kg, worse than 95% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Difficult to machine — 23/100, worse than 93% of stainless steel grades
S35125 CD-A properties
Typical room-temperature values for S35125 CD-A; 22 are specific to this condition. Other listed values are S35125 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S35125 CD-A has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,330°C (2,426 °F).
Mechanical14
S35125 CD-A has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal5
S35125 CD-A is rated for continuous service to 1,100°C (2,012 °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 µm/m·K (8.33 µin/in·°F).
Electrical3
S35125 CD-A conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental2
Corrosion resistance is very good (72/100), better than 73% of stainless steel grades.
Sustainability4
Producing a kilogram of S35125 CD-A takes about 90 MJ of energy and emits 6.8 kg of CO₂ — more than 94% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
S35125 CD-A's machinability is poor (23/100, worse than 93% of stainless steel grades); weldability very good (70/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S35125 CD-A
Is S35125 easy to machine?
Machine like a Ni-base alloy: rigid setup, sharp positive-rake carbide, low speed / heavy positive feed, flood coolant and no dwelling to avoid severe work hardening.
Can S35125 be welded?
GTAW/GMAW/SMAW with matching 35Ni-25Cr or Ni-base (ERNiCr-3 / ERNiCrCoMo-1) filler; low heat input, interpass ≤150 °C, no preheat and normally no PWHT.
Can S35125 be formed, bent or molded?
Hot work at 1150–1200 °C and finish above ~950 °C; cold forming is possible but needs ~50 % higher loads than 304 and interstage solution annealing at 1150 °C + rapid cooling.
What surface finishes work on S35125?
Pickle in HNO₃-HF or mechanically descale after hot work, then passivate; electropolishing gives the best high-temperature surface — anodizing is not applicable.
S35125 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 |
|---|---|---|
| Niaustenite stabilizer, carburization resistance | 33 – 37 | 35 |
| Croxidation/scaling resistance | 24 – 27 | 25 |
| Ccarbide strengthening for creep | 0.04 – 0.1 | 0.07 |
| Siaids scale adherence | ≤ 1.5 | 0.8 |
| Mn | ≤ 2 | 1 |
| N | ≤ 0.15 | 0.08 |
| P | ≤ 0.03 | — |
| S | ≤ 0.02 | — |
| Febalance; exact ranges to be confirmed against the governing ASTM/ASME product specification | balance | — |
S35125 CD-A — frequently asked
What is S35125 CD-A used for?
S35125 CD-A is typically used for high-temperature furnace fixtures, heat-treating baskets and process piping in thermal service. In short: 1100 °C service ceiling; creep-resistant 35Ni-Cr grade; not for wet acids.
What is the yield strength of S35125 CD-A?
S35125 CD-A has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 72% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S35125 CD-A easy to machine?
Not especially — machinability is rated poor (23/100, worse than 93% of stainless steel grades). Machine like a Ni-base alloy: rigid setup, sharp positive-rake carbide, low speed / heavy positive feed, flood coolant and no dwelling to avoid severe work hardening.
Can S35125 CD-A be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW/SMAW with matching 35Ni-25Cr or Ni-base (ERNiCr-3 / ERNiCrCoMo-1) filler; low heat input, interpass ≤150 °C, no preheat and normally no PWHT.
What surface finishes work on S35125 CD-A?
Pickle in HNO₃-HF or mechanically descale after hot work, then passivate; electropolishing gives the best high-temperature surface — anodizing is not applicable.
Can S35125 CD-A be formed, bent or molded?
Hot work at 1150–1200 °C and finish above ~950 °C; cold forming is possible but needs ~50 % higher loads than 304 and interstage solution annealing at 1150 °C + rapid cooling.
What is the maximum service temperature of S35125 CD-A?
S35125 CD-A is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S35125-SA and S35125-CW?
SA is the default condition — standard supply condition for plate, tube and bar; maximum ductility, carbides in solution, best creep and oxidation behaviour. CW: limited-availability hard temper for room-temperature strength in springs and fasteners; not recommended above ~550 °C because cold work recovers. Yield strength is 270 MPa in SA versus 590 MPa in CW.
Sources
- ASTM A240/A240M — Chromium-Nickel Stainless Plate, Sheet and Strip — ASTM International (2023)
- ASTM A312/A312M and A213/A213M — Austenitic Stainless Pipe and Tube — ASTM International (2022)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys (heat-resistant Fe-Ni-Cr alloys) — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (high-temperature corrosion of Fe-Ni-Cr alloys) — ASM International (2005)
- Metals & Alloys in the Unified Numbering System (UNS) — SAE International / ASTM (2021)
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.