Stainless Steel S35125
UNS S35125
S35125 is a 35Ni-Cr superaustenitic stainless alloy of the high-temperature family, offering creep strength and oxidation resistance for service up to about 1100 °C.
Reference datasheet — S35125 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SA condition
S35125 tempers and conditions
S35125 is supplied in 4 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
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 | — |
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 |
Supply forms, finishes and certifications
Ways S35125 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
HRAP | Hot rolled, annealed and pickled plate | Surface finish |
What is S35125?
S35125 is a 35Ni-Cr superaustenitic stainless alloy of the high-temperature family, offering creep strength and oxidation resistance for service up to about 1100 °C. Solution-annealed properties are 270 MPa yield, 600 MPa tensile, 45 % elongation and 165 HB, and product is available as solution-annealed and hot-rolled annealed pickled material, cold-drawn annealed and cold-worked bar and as-welded tube. It work-hardens like a nickel-base alloy, so machining is slow and cold forming needs about 50 % higher loads than 304. It is a heat-resisting grade, not a wet-acid grade — use Alloy 28 or a 6Mo austenitic for aqueous acid service. S35125 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). S35125 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
What is S35125 used for?
- high-temperature furnace fixtures
- heat-treating baskets
- process piping in thermal service
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% 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 — 25/100, worse than 88% of stainless steel grades
- Low strength — 270 MPa (39.2 ksi), worse than 79% of stainless steel grades
S35125 properties
Typical room-temperature values for S35125-SA; bars are the position among stainless steel grades.
Physical3
S35125 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 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal5
S35125 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 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 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's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability very good (70/100); formability good (60/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. S35125 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S35125
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.
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 |
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.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
How much does S35125 cost?
S35125 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
S35125 — frequently asked
What is S35125 used for?
S35125 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?
S35125 has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 79% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S35125 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% 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 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?
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 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?
S35125 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.
How much does S35125 cost?
S35125 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.