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EN 31 Alloy Steel Round Bar

Standard Grade C Mn P S Si Ni Cr Mo
ASTM A295 52100 0.93-1.05 0.25-0.45 0.025 max 0.015 max 0.15-0.35 0.25 1.35-1.60 0.1
DIN 17230 100Cr6 / 1.3505 0.90-1.05 0.25-0.45 0.030 max 0.025 max 0.15-0.35 0.3 1.35-1.65
JIS G4085 SUJ2 0.95-1.10 0.5 0.025 max 0.025 max 0.15-0.35 1.30-1.60
BS 970 535A99 / EN31 0.95-1.10 0.40-0.70 0.035 max 0.030 max 0.10-0.35 1.20-1.60

 

EN31 Alloy Steel is a high carbon, chromium containing low alloy steel that is through hardening and noted in particular for use as bearings. AISI 52100 has an excellent high carbon alloy steel which provides a high level of hardness with compressive strength and abrasion resistance. This grade of alloy steel is quite regularly utilized for wear resisting machine constituents and for press instruments.

 

STEEL PROPERTIES

  • Standard high-speed steel grade
  • Contains well-balanced alloy composition
  • High toughness
  • Great cutting edge retention
  • Superior hardness, 60-67 on Rockwell hardness scale (Rc) at room temperature
  • High carbon chrome alloy steel
  • Operates continually at temperatures up to 120°C
  • Used to produce precision ball bearings and roller bearings
  • Cost-effective
  • Long working life

 

PHYSICAL PROPERTIES

Thermal Conductivity at °C W / (m*K)
20 44.5
350 45
700 46

 

HEAT TREATMENT

Soft Annealing °C 780-800
Cooling Furnace
Hardness HB max. 207
Stress-relief Annealing °C 600-650

 

1st Pre-Heating °C up to approx. 400 in an air-circulating furnace
2nd and 3rd 800 and 900
Hardening °C 800-820
Quenching 810°C Oil, Quench
Tempering °C at least twice 150-200
Hardness after Temperature HRC 61-63