Steel 60SiCr8
EN 60SiCr8 · JIS SUP12 · GB 60Si2CrA
60SiCr8 (1.7108, 60Si2CrA, SUP12) is a high-silicon chromium spring steel that combines very high strength with resistance to sag under sustained load.
Reference datasheet — 60SiCr8 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 QT-48 condition
60SiCr8 tempers and conditions
60SiCr8 is supplied in 9 conditions, soft to hard. QT-48 is the default FabDigit quotes; the values on this page are for it.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Softest supply condition for machining, cold coiling of heavy bar, or upsetting before hardening. | 480 | 800 | 16 | 235 HB | — |
Normalized | Grain-refined intermediate condition used after hot forming and before final hardening. | 620 | 1,000 | 12 | 30 HRC | 5.6 % IACS |
Hot rolled | Mill supply condition for leaf-spring and bar stock that will be hot formed and then quenched and tempered. | 650 | 1,050 | 11 | 31 HRC | 5.5 % IACS |
Cold drawn | Close-tolerance bright bar or pre-drawn wire for machining and subsequent hardening. | 780 | 950 | 8 | 29 HRC | 5.4 % IACS |
Q&T 42–46 HRC | Choose when impact toughness and shot-blast tolerance matter more than maximum stress, e.g. leaf springs and torsion bars. | 1,300 | 1,450 | 10 | 44 HRC | — |
QT-48Default Q&T 46–50 HRC | The normal working condition for coil and suspension springs — best balance of strength, relaxation resistance and toughness. | 1,550 | 1,750 | 8 | 48 HRC | — |
Q&T + stress relieved and shot peened spring | Finished-spring condition: compressive surface residual stress raises fatigue limit substantially over the as-tempered state. | 1,550 | 1,750 | 8 | 48 HRC | 5.2 % IACS |
Q&T 50–54 HRC | Maximum stress capacity for small-section, highly stressed springs; accept low ductility and high notch/decarburization sensitivity. | 1,750 | 1,950 | 6 | 52 HRC | — |
oil hardened and tempered valve-spring wire (EN 10270-2 VDSiCr type) | Continuously oil-hardened-and-tempered clean-steel wire for valve and high-cycle suspension springs; highest strength and cleanliness class. | 1,850 | 2,050 | 6 | 54 HRC | — |
What is 60SiCr8?
60SiCr8 (1.7108, 60Si2CrA, SUP12) is a high-silicon chromium spring steel that combines very high strength with resistance to sag under sustained load. It is used for demanding automotive springs and is supplied as annealed, hot-rolled, normalized and cold-drawn stock, oil-tempered VDSiCr valve-spring wire and quenched-and-tempered conditions from 44 to 52 HRC. Typical properties are 1550 MPa yield, 1750 MPa tensile, 8 % elongation and 460 HB (48 HRC), with service to 250 °C. Machinability is low at 15 and the steel is effectively non-weldable, so parts are coiled and heat treated rather than fabricated. 60SiCr8 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). 60SiCr8 has a yield strength of 1,550 MPa (225 ksi) and a tensile strength of 1,750 MPa (254 ksi) — stronger than 97% of steel grades. Elongation at break is 8% and the elastic modulus is 206 GPa (29.9 Msi).
What is 60SiCr8 used for?
- Valve springs
- Suspension coil springs
- Clutch springs
Advantages
- High strength — 1,550 MPa (225 ksi), better than 97% of steel grades
Limitations
- Difficult to machine — 15/100, worse than 98% of steel grades
- Low fracture toughness — 30 MPa·√m (27.3 ksi·√in), worse than 96% of steel grades
- Difficult to weld — 12/100, worse than 96% of steel grades
- Limited ductility — 8%, worse than 95% of steel grades
- Limited formability — 10/100, worse than 95% of steel grades
60SiCr8 properties
Typical room-temperature values for 60SiCr8-QT-48; bars are the position among steel grades.
Physical3
60SiCr8 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
60SiCr8 has a yield strength of 1,550 MPa (225 ksi) and a tensile strength of 1,750 MPa (254 ksi) — stronger than 97% of steel grades. Elongation at break is 8% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
60SiCr8 is rated for continuous service to 250°C (482 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 83% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
60SiCr8 conducts electricity at 5.2 % IACS, worse than 81% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 60SiCr8 takes about 30 MJ of energy and emits 2.1 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability5
60SiCr8's machinability is poor (15/100, worse than 98% of steel grades); weldability not recommended (12/100); formability not recommended (10/100).
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. 60SiCr8 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 60SiCr8
Is 60SiCr8 easy to machine?
Machine in the spheroidize-annealed state (≈235 HB) with coated carbide; above 45 HRC use grinding or CBN only, and keep decarburized skin off spring surfaces.
Can 60SiCr8 be welded?
Effectively non-weldable for spring duty (C ≈ 0.60 %, high Si); if unavoidable, preheat 300–400 °C, low-hydrogen consumables and re-quench/temper the joint.
Can 60SiCr8 be formed, bent or molded?
Cold coil in annealed or oil-tempered wire condition; heavy sections hot form at 900–1050 °C, then austenitize 860–900 °C, oil quench and temper 400–480 °C for 45–50 HRC.
60SiCr8 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 | 0.55 – 0.65 | 0.6 |
| SiGB 60Si2CrA uses 1.40–1.80 % | 1.6 – 2.1 | 1.85 |
| Mn | 0.6 – 1 | 0.8 |
| CrGB 60Si2CrA and JIS SUP12 run 0.60–1.00 % Cr | 0.2 – 0.45 | 0.3 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Curesidual, max | ≤ 0.2 | |
| Fe | balance |
What surface finishes work on 60SiCr8?
Shot peen springs after stress relief for fatigue life; protect with zinc-flake, phosphate+oil or powder coat — avoid acid pickling and electroplating without post-bake due to hydrogen embrittlement risk.
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).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel 60SiCr8 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7108
- GB (China)
- 60Si2CrA
- JIS
- SUP12
How much does 60SiCr8 cost?
60SiCr8 is a budget-cost steel ($), cheaper than about 90% 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.
60SiCr8 — frequently asked
What is 60SiCr8 used for?
60SiCr8 is typically used for valve springs, suspension coil springs and clutch springs. In short: high sag resistance; valve-spring quality steel; not a fabrication steel.
What is the yield strength of 60SiCr8?
60SiCr8 has a typical yield strength of 1,550 MPa (225 ksi) and a tensile strength of 1,750 MPa (254 ksi) — stronger than 97% of steel grades. Strength varies by condition: see the 9 listed tempers.
Is 60SiCr8 easy to machine?
Not especially — machinability is rated poor (15/100, worse than 98% of steel grades). Machine in the spheroidize-annealed state (≈235 HB) with coated carbide; above 45 HRC use grinding or CBN only, and keep decarburized skin off spring surfaces.
Can 60SiCr8 be welded?
Not readily — weldability is rated not recommended (12/100). Effectively non-weldable for spring duty (C ≈ 0.60 %, high Si); if unavoidable, preheat 300–400 °C, low-hydrogen consumables and re-quench/temper the joint.
What surface finishes work on 60SiCr8?
Shot peen springs after stress relief for fatigue life; protect with zinc-flake, phosphate+oil or powder coat — avoid acid pickling and electroplating without post-bake due to hydrogen embrittlement risk.
Can 60SiCr8 be formed, bent or molded?
Cold coil in annealed or oil-tempered wire condition; heavy sections hot form at 900–1050 °C, then austenitize 860–900 °C, oil quench and temper 400–480 °C for 45–50 HRC.
What is the maximum service temperature of 60SiCr8?
60SiCr8 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.
What is the difference between 60SiCr8 QT-48 and 60SiCr8-A?
QT-48 is the default condition — the normal working condition for coil and suspension springs — best balance of strength, relaxation resistance and toughness. A: softest supply condition for machining, cold coiling of heavy bar, or upsetting before hardening. Yield strength is 1,550 MPa in QT-48 versus 480 MPa in A.
How much does 60SiCr8 cost?
60SiCr8 is a budget-cost steel ($), cheaper than about 90% 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
- EN 10089 — Hot rolled steels for quenched and tempered springs — CEN (2002)
- EN 10270-2 — Steel wire for mechanical springs: oil hardened and tempered spring steel wire — CEN (2011)
- GB/T 1222 — (60Si2CrA) — SAC (2016)
- JIS G 4801 — Spring steels (SUP12) — JISC (2011)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- EN 13906-1 — Cylindrical helical springs, design and calculation — CEN (2013)
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.