EN31
EN31 Grade Introduction:
EN31 is a very high strength steel alloy that is hardened and tempered before supplying and has nickel, chromium, molybdenum making its high tensile steel strength, with good ductility and wear resistance. With relatively good impact properties at low temperatures, EN31 is also suitable for a variety of elevated temperature applications. EN31 round bars have good internal strength and high external strength, which makes them highly wear-resistant. EN31 steel round bars offer a good combination of ductility, strength, and wear resistance. EN31 is a very high-strength alloy engineering steel.
EN31 Grade Application:
- Taps
- Gauges
- Swaging dies
- Ejector pins
- Ball bearings
- Roller bearings
EN31 Equivalent Grades:
| BRITISH BS 970:1991 535A99 |
BRITISH BS 970:1991 535A99 |
GERMAN DIN 100CR6 |
FRENCH AFNOR 100C6 |
AMERICAN SAE 52100 |
EN31 Chemical Composition:
| Element |
C |
Si |
Mn |
P |
S |
Cr |
| Content (%) |
0.95-1.10 |
0.10-0.35 |
0.40-0.70 |
0.040 Max |
0.050 Max |
1.20-1.60 |
Mechanical Properties:
| ELEMENT |
OBJECTIVE |
| Tensile Strength |
750 N/mm² |
| Yield Stress |
450 N/mm² |
| Reduction of Area |
45% |
| Elongation |
30% |
| Modulus of elasticity |
215 000 N/mm² |
| Density |
7.8 Kg/m3 |
| Hardness |
63 HRC |
Physical Properties:
| NAME OF MATERIAL |
COMPOSITION IN % OF WEIGHT |
|
THERMAL CONDUCTIVITY W/M-K |
DENSITY KG/M^3 |
MELTING POINT |
|
C |
Mn Si Cr S P Mg |
|
|
|
| En-31 IS-103 Crl |
1.5 |
0.52 0.22 1.3 0.05 0.05 – |
46.6 |
7810 |
1540 |
Thermal Properties:
| Properties |
Metric |
Imperial |
| Thermal expansion coefficient (@ 23-280°C/73.4-36°F, annealed) |
11.9 µm/m°C |
6.61 µin/in°F |
| Thermal conductivity (typical steel) |
46.6 W/mK |
323 BTU in/hr.ft².°F |
Forging Properties:
Heat slowly and begin forging at 1000-1050°C. Allow sufficient time at the forging temperature for the steel to be thoroughly soaked through. Reheat as necessary and do not forge below 850°C. After forging EN31 steel, cool slowly preferably in a furnace.
Stress Relieving:
When parts are to be heavily machined, stress-relieving will be beneficial prior to hardening. Heat the EN31 carefully to 700°C, soak well and allow to cool in air.