Steel 60SiCrV7 +CH
Heat-treated state
EN 60SiCrV7
+CH = through/core hardened to a specified core hardness
For heavy sections where a guaranteed hardness at the bar core is contracted — quench and low-to-medium temper, higher strength but lower ductility than the standard spring temper.
Values for the +CH condition
Other 60SiCrV7 tempers and conditions
60SiCrV7 is listed in 7 conditions; see the grade overview at 60SiCrV7.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Choose when maximum cold formability is needed — cold coiling, upsetting, cold extrusion or heavy machining before hardening. | 450 | 730 | 18 | 205 HB | — |
Treated for high shearability | Soft, low-hardness delivery for cold shearing of bar into slugs/blanks without cracked or fish-tailed cut faces. | 470 | 760 | 16 | 17 HRC | 5.5 % IACS |
Annealed | Standard mill delivery condition of bar and coil for customers who will machine, cold-coil and then heat treat the part themselves. | 500 | 800 | 14 | 225 HB | — |
Cold drawn | Cold-drawn bar/wire with tight tolerance and bright surface, drawn from soft-annealed material and hardened after forming. | 750 | 950 | 8 | 29 HRC | 5.2 % IACS |
+QTDefault Quenched and tempered | The working condition for finished springs: oil quench from ~860 °C, temper 400–480 °C for maximum elastic limit and fatigue strength. | 1,550 | 1,750 | 7 | 50 HRC | — |
+CHThis page Through/core hardened to a specified core hardness | For heavy sections where a guaranteed hardness at the bar core is contracted — quench and low-to-medium temper, higher strength but lower ductility than the standard spring temper. | 1,700 | 1,950 | 5 | 54 HRC | — |
Hardened (oil quenched, low-temper) / supplied with specified… | Fully hardened, only stress-relieved (150–250 °C) — maximum hardness and wear resistance but very low toughness; also the designation for bar ordered to a guaranteed Jominy hardenability band. | 1,800 | 2,150 | 2 | 60 HRC | — |
What is 60SiCrV7 +CH?
60SiCrV7 +CH is 60SiCrV7 heat treated to +CH — for heavy sections where a guaranteed hardness at the bar core is contracted — quench and low-to-medium temper, higher strength but lower ductility than the standard spring temper. 60SiCrV7 +CH has a yield strength of 1,700 MPa (247 ksi) and a tensile strength of 1,950 MPa (283 ksi) — stronger than 99% of steel grades. Elongation at break is 5% and the elastic modulus is 206 GPa (29.9 Msi). 60SiCrV7 +CH has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,420°C (2,588 °F). +QT is the default condition FabDigit quotes; +CH is available on request or by drawing note.
Advantages
- High strength — 1,700 MPa (247 ksi), better than 99% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
Limitations
- Difficult to machine — 8/100, worse than 100% of steel grades
- Difficult to weld — 6/100, worse than 100% of steel grades
- Limited formability — 5/100, worse than 99% of steel grades
- Limited ductility — 5%, worse than 98% of steel grades
- Low fracture toughness — 25 MPa·√m (22.8 ksi·√in), worse than 97% of steel grades
60SiCrV7 +CH properties
Typical room-temperature values for 60SiCrV7 +CH; 14 are specific to this condition. Other listed values are 60SiCrV7 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
60SiCrV7 +CH has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
60SiCrV7 +CH has a yield strength of 1,700 MPa (247 ksi) and a tensile strength of 1,950 MPa (283 ksi) — stronger than 99% of steel grades. Elongation at break is 5% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
60SiCrV7 +CH is rated for continuous service to 220°C (428 °F). It conducts heat at 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 82% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
60SiCrV7 +CH conducts electricity at 4.9 % IACS, worse than 82% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 60SiCrV7 +CH takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
60SiCrV7 +CH's machinability is not recommended (8/100, worse than 100% of steel grades); weldability not recommended (6/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 60SiCrV7 +CH
Is 60SiCrV7 easy to machine?
Machine only in the +A/+AC condition (~200–240 HB) with carbide tooling and rigid setups; once quenched to 50 HRC only grinding, EDM or CBN turning are practical.
Can 60SiCrV7 be welded?
Essentially unweldable in service condition — 0.6 %C gives very high carbon equivalent; if unavoidable, preheat 300–350 °C, use low-hydrogen consumables and re-temper immediately.
Can 60SiCrV7 be formed, bent or molded?
Cold coil/bend in the spheroidized condition or use hot coiling at 850–950 °C; harden by oil quench from 850–880 °C and temper 400–480 °C, then shot peen and pre-set springs.
What surface finishes work on 60SiCrV7?
No natural corrosion protection: shot peen, then phosphate + oil, powder coat or Zn/Zn-Ni plate with a 190–220 °C post-plate bake to avoid hydrogen embrittlement; keep decarburized surface layer ground off.
60SiCrV7 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 |
|---|---|---|
| CEN 10089 | 0.55 – 0.65 | 0.6 |
| Siraises elastic limit and relaxation resistance; promotes decarburization | 1.5 – 1.8 | 1.65 |
| Mn | 0.7 – 1 | 0.85 |
| Crhardenability | 0.2 – 0.4 | 0.3 |
| Vgrain refinement, carbide precipitation | 0.1 – 0.2 | 0.15 |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Fe | balance | — |
60SiCrV7 +CH — frequently asked
What is 60SiCrV7 +CH used for?
60SiCrV7 +CH is typically used for heavy vehicle leaf springs, railway springs, industrial coil springs and high-load elastic components. In short: highest-carbon Si-Cr-V spring grade; deep hardening, high elastic limit; machine only when annealed.
What is the yield strength of 60SiCrV7 +CH?
60SiCrV7 +CH has a typical yield strength of 1,700 MPa (247 ksi) and a tensile strength of 1,950 MPa (283 ksi) — stronger than 99% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 60SiCrV7 +CH easy to machine?
Not especially — machinability is rated not recommended (8/100, worse than 100% of steel grades). Machine only in the +A/+AC condition (~200–240 HB) with carbide tooling and rigid setups; once quenched to 50 HRC only grinding, EDM or CBN turning are practical.
Can 60SiCrV7 +CH be welded?
Not readily — weldability is rated not recommended (6/100). Essentially unweldable in service condition — 0.6 %C gives very high carbon equivalent; if unavoidable, preheat 300–350 °C, use low-hydrogen consumables and re-temper immediately.
What surface finishes work on 60SiCrV7 +CH?
No natural corrosion protection: shot peen, then phosphate + oil, powder coat or Zn/Zn-Ni plate with a 190–220 °C post-plate bake to avoid hydrogen embrittlement; keep decarburized surface layer ground off.
Can 60SiCrV7 +CH be formed, bent or molded?
Cold coil/bend in the spheroidized condition or use hot coiling at 850–950 °C; harden by oil quench from 850–880 °C and temper 400–480 °C, then shot peen and pre-set springs.
What is the maximum service temperature of 60SiCrV7 +CH?
60SiCrV7 +CH is rated for continuous use to about 220°C (428 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
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 — (60Si2CrVA) — SAC (2016)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Spring Steels) — ASM International (1990)
- EN 13906-1 — Cylindrical helical springs, compression springs design — CEN (2013)
- Spring steel grade data sheets (Si-Cr-V grades) — European long-products mills (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.