Silicon-chromium spring steel — superior to 51CrV4 at elevated temperatures. Standard for automotive valve springs and suspension components in hot conditions.
Standards
| Standard Body |
Designation |
Country |
| EN / ISO |
60SiCr7 |
European Union |
| DIN |
60SiCr7 / 1.8153 |
Germany |
| AISI/SAE |
9262 (nearest) |
USA |
| ASTM |
A689 Grade 9262 |
USA |
| BS EN |
685A57 (nearest) |
UK |
| JIS |
SUP11 (nearest) |
Japan |
| GOST |
60S2H2A (60S2KhA) |
Russia / CIS |
| UNI |
60SiCr7 |
Italy |
| NF |
60SC7 |
France |
| SS |
2085 |
Sweden |
| PN |
60S2H |
Poland |
| CSN |
15290 |
Czech Republic |
| UNS |
G92620 (nearest) |
USA |
| GB |
60Si2CrA |
China |
| JUS |
C.5233 |
Yugoslavia / Serbia |
| ONORM |
60SiCr7 |
Austria |
Composition (wt.%)
| Element |
Symbol |
Min % |
Max % |
Typical % |
| Carbon |
C |
0.560 |
0.640 |
0.600 |
| Silicon |
Si |
1.600 |
2.000 |
1.800 |
| Manganese |
Mn |
0.700 |
1.000 |
0.850 |
| Chromium |
Cr |
0.200 |
0.400 |
0.300 |
Physical
Melting Range
1395 – 1450
°C
Thermal Conductivity
36
W/mK
Thermal Expansion
12.5
×10⁻⁶/K
Machinability
| Rating |
42.0% (B1112=100%) |
| Turning HSS |
25.0 m/min |
| Turning Carbide |
130.0 m/min |
| Surface Finish |
Ra 0.8-1.6 um |
| Coolant |
Soluble oil 8-12% |
Mechanical
| Condition |
Rm (MPa) | Re (MPa) | A (%) |
HB | HRC | KV (J) | E (GPa) |
| Soft Annealed (+A) |
900 – 1100 |
700 – 900 |
10 – 14 |
260 – 320 |
— |
— |
210 |
| Q+T (t<=4mm wire) (+QT) |
1700 – 2000 |
≥1550 |
≥5 |
495 – 590 |
— |
— |
210 |
| Q+T (t=8-12mm) (+QT) |
1600 – 1900 |
≥1400 |
≥6 |
455 – 555 |
— |
— |
210 |
Heat Treatment
| Process |
Temperature |
Medium |
Duration |
Hardness After |
| Spheroidising Anneal |
680 – 720°C |
Furnace |
4-6 h |
<=HB 290 |
| Austenitizing |
900 – 950°C |
Oil |
10-20 min |
HRC 52-58 |
| Tempering (spring) |
380 – 450°C |
Oil bath or oven |
30-60 min |
HRC 44-52 |
| Stress Relief (formed springs) |
200 – 220°C |
Air oven |
30-60 min |
Minimal change |
Applications
Engine Springs: Automotive and truck engine valve springs — primary application.
Disc Springs: Belleville washers and conical disc springs for heavy equipment.
Suspension: High-performance suspension coil springs where reduced weight vs 51CrV4 is needed.
Notes
Elevated Temperature: 60SiCr7 valve springs retain 90% of their load capacity at 200 C, vs 70% for 51CrV4. Critical for high-performance engine valve springs.
vs 51CrV4: 51CrV4: standard spring steel for ambient-temperature applications. 60SiCr7: preferred for applications above 100-150 C service temperature.