Stainless Steel 1.4310 · heat-treated state
Stainless Steel 1.4310 +C1000+SR
Properties of the +C1000+SR condition, compared with the other 1.4310 tempers.
Post-form low-temperature age to raise elastic limit, reduce spring set/relaxation and stabilise shape.
What is 1.4310 +C1000+SR?
1.4310 +C1000+SR is 1.4310 heat treated to +C1000+SR — post-form low-temperature age to raise elastic limit, reduce spring set/relaxation and stabilise shape. 1.4310 +C1000+SR has a yield strength of 950 MPa (138 ksi) and a tensile strength of 1,180 MPa (171 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 8% and the elastic modulus is 190 GPa (27.6 Msi). 1.4310 +C1000+SR has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 67% of stainless steel grades. It melts at 1,400°C (2,552 °F). +C1000 is the default condition FabDigit quotes; +C1000+SR is available on request or by drawing note.
Advantages
- High strength — 950 MPa (138 ksi), better than 98% of stainless steel grades
Limitations
- Limited ductility — 8%, worse than 99% of stainless steel grades
- Limited service temperature — 320°C (608 °F), worse than 85% of stainless steel grades
- Needs corrosion protection — 52/100, worse than 77% of stainless steel grades
1.4310 +C1000+SR properties
Typical room-temperature values for 1.4310 +C1000+SR — 8 properties are specific to this condition; the rest are grade-level values shared by every 1.4310 temper. Each bar shows where the value sits among the stainless steel grades in FabDigit's library — further right is higher.
Physical3
1.4310 +C1000+SR has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 67% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical11
1.4310 +C1000+SR has a yield strength of 950 MPa (138 ksi) and a tensile strength of 1,180 MPa (171 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 8% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal6
1.4310 +C1000+SR is rated for continuous service to 320°C (608 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
1.4310 +C1000+SR conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 77% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4310 +C1000+SR takes about 53 MJ of energy and emits 4.6 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
1.4310 +C1000+SR's machinability is poor (28/100, worse than 80% of stainless steel grades); weldability good (55/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 1.4310 tempers and conditions
1.4310 is also supplied in 9 other conditions. The full side-by-side table is on the 1.4310 overview.
- +C1000DefaultThe workhorse spring-strip temper: good balance of spring force, bendability and availability.780 MPa yield · 32 HRC
- +C1900Maximum-strength razor/feeler-gauge type strip; essentially flat parts only, no forming.1,750 MPa yield · 53 HRC
- +C1700Very high-strength thin strip (typically <0.5 mm) for miniature springs and contact blades.1,550 MPa yield · 50 HRC
- +C1500Extra-hard thin strip for high-force springs and shims where only gentle bending is needed.1,350 MPa yield · 47 HRC
- +C1300Full-hard spring temper for flat springs, contact strips and clamping bands.1,150 MPa yield · 43 HRC
- +C1150Three-quarter-hard strip for higher spring force with generous bend radii.950 MPa yield · 38 HRC
- +C1000+SRPost-form low-temperature age to raise elastic limit, reduce spring set/relaxation and stabilise shape.950 MPa yield · 35 HRC
- +C800Quarter-hard strip for clips, brackets and shims that still need 90° bending across the rolling direction.570 MPa yield · 25 HRC
- +C700Lightly rolled temper when moderate strength must be combined with substantial forming/bending.450 MPa yield · 99 HRB
- +ATPick for deep-drawn/stamped parts that will be work-hardened in service or for material to be re-rolled to temper.280 MPa yield · 165 HB
Working with 1.4310 +C1000+SR
Is 1.4310 easy to machine?
Gummy and strongly work-hardening — use rigid setups, sharp positive-rake carbide, heavy positive feed and flood coolant; cold-worked tempers cut better but load tools more, blanking/stamping is the preferred route.
Can 1.4310 be welded?
Resistance, laser and TIG weld readily (308L/307 filler); the 0.05–0.15 % C invites carbide precipitation, and welding destroys the cold-work strength in the HAZ, so spring parts should be joined away from the working section.
Can 1.4310 be formed, bent or molded?
Anneal-temper stock stamps and deep-draws superbly (heavy springback, strong work-hardening, may need interstage anneals); high +C tempers bend only across the rolling direction with generous radii (≥1–3 t).
What surface finishes work on 1.4310?
Passivate per ASTM A967 or electropolish after forming; 2R/BA and No.4 finishes polish well; do not anodize — plating (Ni, Sn) needs a Woods-nickel strike.
1.4310 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 |
|---|---|---|
| Chigh C is what enables the strong work hardening | 0.05 – 0.15 | 0.11 |
| Si | ≤ 2 | 0.6 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.05 | — |
| S | ≤ 0.02 | — |
| Cr | 16 – 19 | 17.3 |
| Ni | 6 – 9.5 | 7.3 |
| Moresidual limit per EN 10088-2 | ≤ 0.8 | — |
| N | ≤ 0.11 | 0.04 |
| Fe | balance | — |
1.4310 +C1000+SR — frequently asked
What is 1.4310 +C1000+SR used for?
1.4310 +C1000+SR is typically used for springs, clips, cutlery and structural strip for cold-formed parts. In short: work-hardening spring stainless; tempers to 1900 MPa; strength by cold rolling.
What is the yield strength of 1.4310 +C1000+SR?
1.4310 +C1000+SR has a typical yield strength of 950 MPa (138 ksi) and a tensile strength of 1,180 MPa (171 ksi) — stronger than 98% of stainless steel grades. Strength varies by condition: see the 10 listed tempers.
Is 1.4310 +C1000+SR easy to machine?
Not especially — machinability is rated poor (28/100, worse than 80% of stainless steel grades). Gummy and strongly work-hardening — use rigid setups, sharp positive-rake carbide, heavy positive feed and flood coolant; cold-worked tempers cut better but load tools more, blanking/stamping is the preferred route.
Can 1.4310 +C1000+SR be welded?
Yes — weldability is rated good (55/100). Resistance, laser and TIG weld readily (308L/307 filler); the 0.05–0.15 % C invites carbide precipitation, and welding destroys the cold-work strength in the HAZ, so spring parts should be joined away from the working section.
What surface finishes work on 1.4310 +C1000+SR?
Passivate per ASTM A967 or electropolish after forming; 2R/BA and No.4 finishes polish well; do not anodize — plating (Ni, Sn) needs a Woods-nickel strike.
Can 1.4310 +C1000+SR be formed, bent or molded?
Anneal-temper stock stamps and deep-draws superbly (heavy springback, strong work-hardening, may need interstage anneals); high +C tempers bend only across the rolling direction with generous radii (≥1–3 t).
What is the maximum service temperature of 1.4310 +C1000+SR?
1.4310 +C1000+SR is rated for continuous use to about 320°C (608 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10088-2 Stainless steels — Technical delivery conditions for sheet/plate and strip — CEN (2014)
- EN 10151 Stainless steel strip for springs — Technical delivery conditions — CEN (2002)
- ASTM A666 Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate and Flat Bar — ASTM International (2015)
- GB/T 3280 (12Cr17Ni7) — SAC (2015)
- JIS G4313 Cold-rolled stainless steel strip for springs (SUS301) — JSA (2011)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
- Precision stainless spring strip 1.4310 data sheets — Outokumpu / Sandvik / Aperam (2023)
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.