Steel 60Si2Mn Hardened & Tempered
Heat-treated state
GB 60Si2Mn
Final spring condition: maximum elastic limit and relaxation resistance for leaf, coil and disc springs; usually shot-peened afterwards.
Values for the Hardened & Tempered condition
Other 60Si2Mn tempers and conditions
60Si2Mn is listed in 5 conditions; see the grade overview at 60Si2Mn.
- Annealed
- Hot Rolled
- Normalized
- Cold Drawn
- Hardened & Tempered
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault softened / spheroidise-annealed bar (≤302 HBW) | Standard stocked condition for machining, cold forming and blanking before final quench-and-temper. | 480 | 800 | 15 | 255 HB | — |
as-rolled bar/flat/coil | Cheapest mill condition for bars and flats that will be formed hot or fully heat treated afterwards. | 600 | 1,000 | 10 | 30 HRC | 5.7 % IACS |
860–880 °C air cool | Used to homogenise structure and refine grain in forgings before final hardening; not a service condition for springs. | 650 | 1,050 | 10 | 31 HRC | 5.7 % IACS |
annealed + cold drawn bar/wire | Bright bar and wire with tighter tolerance and higher as-supplied strength for coiling or turned parts. | 800 | 1,000 | 8 | 31 HRC | 5.7 % IACS |
Hardened & TemperedThis page spring temper, 45–50 HRC (860–880 °C oil quench + 400–460 °C temper) | Final spring condition: maximum elastic limit and relaxation resistance for leaf, coil and disc springs; usually shot-peened afterwards. | 1,600 | 1,750 | 6 | 48 HRC | — |
What is 60Si2Mn Hardened & Tempered?
60Si2Mn Hardened & Tempered is 60Si2Mn heat treated to Hardened & Tempered — final spring condition: maximum elastic limit and relaxation resistance for leaf, coil and disc springs; usually shot-peened afterwards. 60Si2Mn Hardened & Tempered has a yield strength of 1,600 MPa (232 ksi) and a tensile strength of 1,750 MPa (254 ksi) — stronger than 98% of steel grades. Elongation at break is 6% and the elastic modulus is 206 GPa (29.9 Msi). 60Si2Mn Hardened & Tempered has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,420°C (2,588 °F). Annealed is the default condition FabDigit quotes; Hardened & Tempered is available on request or by drawing note.
Advantages
- High strength — 1,600 MPa (232 ksi), better than 98% of steel grades
Limitations
- Difficult to machine — 12/100, worse than 99% of steel grades
- Difficult to weld — 10/100, worse than 99% of steel grades
- Limited formability — 5/100, worse than 99% of steel grades
- Limited ductility — 6%, worse than 97% of steel grades
- Limited service temperature — 250°C (482 °F), worse than 85% of steel grades
60Si2Mn Hardened & Tempered properties
Typical room-temperature values for 60Si2Mn Hardened & Tempered; 15 are specific to this condition. Other listed values are 60Si2Mn reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
60Si2Mn Hardened & Tempered has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical12
60Si2Mn Hardened & Tempered has a yield strength of 1,600 MPa (232 ksi) and a tensile strength of 1,750 MPa (254 ksi) — stronger than 98% of steel grades. Elongation at break is 6% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
60Si2Mn Hardened & Tempered is rated for continuous service to 250°C (482 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical2
60Si2Mn Hardened & Tempered has an electrical resistivity of 3×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 60Si2Mn Hardened & Tempered takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 35%.
Manufacturability6
60Si2Mn Hardened & Tempered's machinability is not recommended (12/100, worse than 99% of steel grades); weldability not recommended (10/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 60Si2Mn Hardened & Tempered
Is 60Si2Mn easy to machine?
Machine only in the annealed (≤302 HBW) state — the high silicon is abrasive, so use rigid setups, coated carbide and moderate speeds; grind after hardening for final size.
Can 60Si2Mn be welded?
Poor: 0.6 %C gives hard, crack-sensitive HAZ — avoid welding on springs; if unavoidable use 200–350 °C preheat, low-hydrogen filler and immediate post-weld temper.
Can 60Si2Mn be formed, bent or molded?
Cold form or coil in the annealed/cold-drawn state with generous bend radii, or hot form at 900–1050 °C; then oil quench 860–880 °C and temper 400–480 °C to the required hardness.
What surface finishes work on 60Si2Mn?
Shot peen springs for fatigue life, then phosphate + paint, powder coat or zinc/e-coat; bake after any electroplating to avoid hydrogen embrittlement — no anodising.
60Si2Mn 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 |
|---|---|---|
| C | 0.56 – 0.64 | 0.6 |
| Si | 1.5 – 2 | 1.75 |
| Mn | 0.6 – 0.9 | 0.75 |
| Crresidual | ≤ 0.35 | |
| Niresidual | ≤ 0.35 | |
| Curesidual | ≤ 0.25 | |
| P≤0.025 for grade 60Si2MnA | ≤ 0.04 | |
| S≤0.020 for grade 60Si2MnA | ≤ 0.04 | |
| Fe | balance |
60Si2Mn Hardened & Tempered — frequently asked
What is 60Si2Mn Hardened & Tempered used for?
60Si2Mn Hardened & Tempered is typically used for automotive leaf springs, helical coil springs, railcar and trailer suspension springs, torsion bars, heavy spring washers and clips and clamp and retaining springs. In short: workhorse spring bar.
What is the yield strength of 60Si2Mn Hardened & Tempered?
60Si2Mn Hardened & Tempered has a typical yield strength of 1,600 MPa (232 ksi) and a tensile strength of 1,750 MPa (254 ksi) — stronger than 98% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 60Si2Mn Hardened & Tempered easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 99% of steel grades). Machine only in the annealed (≤302 HBW) state — the high silicon is abrasive, so use rigid setups, coated carbide and moderate speeds; grind after hardening for final size.
Can 60Si2Mn Hardened & Tempered be welded?
Not readily — weldability is rated not recommended (10/100). Poor: 0.6 %C gives hard, crack-sensitive HAZ — avoid welding on springs; if unavoidable use 200–350 °C preheat, low-hydrogen filler and immediate post-weld temper.
What surface finishes work on 60Si2Mn Hardened & Tempered?
Shot peen springs for fatigue life, then phosphate + paint, powder coat or zinc/e-coat; bake after any electroplating to avoid hydrogen embrittlement — no anodising.
Can 60Si2Mn Hardened & Tempered be formed, bent or molded?
Cold form or coil in the annealed/cold-drawn state with generous bend radii, or hot form at 900–1050 °C; then oil quench 860–880 °C and temper 400–480 °C to the required hardness.
What is the maximum service temperature of 60Si2Mn Hardened & Tempered?
60Si2Mn Hardened & Tempered is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 60Si2Mn Hardened & Tempered?
Yes — 60Si2Mn Hardened & Tempered is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- GB/T 1222 (Spring steels) — SAC / (2016)
- GB/T 1222 heat-treatment and mechanical property requirements — SAC (2016)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels (AISI 9260) — ASM International (1990)
- JIS G 4801 SUP7 (spring steel, comparable grade) — JSA (2011)
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.