Steel 60Si2Mn
GB 60Si2Mn
60Si2Mn is a silicon-manganese spring steel (equivalent to 9260 and SUP7) supplied hot-rolled, normalized, annealed, cold-drawn or hardened and tempered.
Values for the Annealed condition
60Si2Mn tempers and conditions
60Si2Mn is supplied in 5 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
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 |
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?
60Si2Mn is a silicon-manganese spring steel (equivalent to 9260 and SUP7) supplied hot-rolled, normalized, annealed, cold-drawn or hardened and tempered. The high silicon content raises the elastic limit, which is why it is the standard bar and strip material for automotive leaf and coil springs; the default condition on file lists 480 MPa yield, 800 MPa tensile, 15 % elongation and 255 HB. Limits are a maximum service temperature of about 200 °C, poor machinability (score 45) and poor weldability from the ~0.6 % C level. 50CrVA or 60Si2CrVA are used where higher relaxation resistance is needed. 60Si2Mn 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). 60Si2Mn 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).
What is 60Si2Mn used for?
- Automotive leaf springs
- Helical coil springs
- Railcar and trailer suspension springs
- Torsion bars
- Heavy spring washers and clips
- Clamp and retaining springs
- Agricultural tine and harrow springs
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 properties
Typical room-temperature values for 60Si2Mn-Annealed; bars are the position among steel grades.
Physical3
60Si2Mn 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 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 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 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 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'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. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. 60Si2Mn is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 60Si2Mn
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.
Manufacturability
The process limits FabDigit applies to 60Si2Mn. Every 60Si2Mn part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Fair45 / 100 |
|---|---|
| ISO material group | P.2 |
| Cutting speed (rough / finish) | 180 / 210 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 5× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Better40 / 100 |
|---|---|
| Weldability | Fair20 / 100 |
| Bendable | Yes |
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 |
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.
Surface treatments FabDigit runs on 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).
Plating
CVD Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel 60Si2Mn in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does 60Si2Mn cost?
60Si2Mn is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
60Si2Mn — frequently asked
What is 60Si2Mn used for?
60Si2Mn is typically used for automotive leaf springs, helical coil springs, railcar and trailer suspension springs, torsion bars, heavy spring washers and clips and clamp and retaining springs. In short: workhorse spring bar.
What is the yield strength of 60Si2Mn?
60Si2Mn has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 60Si2Mn easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine only in the annealed (≤302 HBW) state — the high silicon is abrasive, so use rigid setups, coated carbide and moderate speeds; grind after hardening for final size.
Can 60Si2Mn be welded?
Not readily — weldability is rated poor (20/100). Poor: 0.6 %C gives hard, crack-sensitive HAZ — avoid welding on springs; if unavoidable use 200–350 °C preheat, low-hydrogen filler and immediate post-weld temper.
What surface finishes work on 60Si2Mn?
Shot peen springs for fatigue life, then phosphate + paint, powder coat or zinc/e-coat; bake after any electroplating to avoid hydrogen embrittlement — no anodising.
Can 60Si2Mn be formed, bent or molded?
Cold form or coil in the annealed/cold-drawn state with generous bend radii, or hot form at 900–1050 °C; then oil quench 860–880 °C and temper 400–480 °C to the required hardness.
What is the maximum service temperature of 60Si2Mn?
60Si2Mn is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 60Si2Mn cost?
60Si2Mn is a standard-cost steel ($$), cheaper than about 71% 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.
Can FabDigit make parts in 60Si2Mn?
Yes — 60Si2Mn 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; 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.