Steel 60Si2Mn Annealed
Temper · default condition
GB 60Si2Mn
Standard stocked condition for machining, cold forming and blanking before final quench-and-temper.
Values for the Annealed condition
Other 60Si2Mn tempers and conditions
60Si2Mn is listed in 5 conditions; see the grade overview at 60Si2Mn.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page 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 |
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 Annealed?
60Si2Mn Annealed is 60Si2Mn in the Annealed temper — standard stocked condition for machining, cold forming and blanking before final quench-and-temper. 60Si2Mn Annealed has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 59% of steel grades. Elongation at break is 15% and the elastic modulus is 206 GPa (29.9 Msi). 60Si2Mn Annealed 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).
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Difficult to weld — 20/100, worse than 84% of steel grades
60Si2Mn Annealed properties
Typical room-temperature values for 60Si2Mn Annealed; 11 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 Annealed 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 Annealed has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 59% of steel grades. Elongation at break is 15% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
60Si2Mn Annealed is rated for continuous service to 200°C (392 °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 Annealed 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 Annealed 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 Annealed's machinability is fair (45/100, worse than 65% of steel grades); weldability poor (20/100); formability fair (40/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 60Si2Mn Annealed
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 Annealed — frequently asked
What is 60Si2Mn Annealed used for?
60Si2Mn Annealed 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 Annealed?
60Si2Mn Annealed has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 60Si2Mn Annealed easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% 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 Annealed be welded?
Not readily — weldability is rated poor (20/100). 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 Annealed?
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 Annealed 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 Annealed?
60Si2Mn Annealed is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 60Si2Mn Annealed?
Yes — 60Si2Mn Annealed 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.