EN 31

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.

Grade Application:

Typical applications for EN31 steel include taps, gauges, swaging dies, ejector pins, ball, and roller bearings. It is good quality steel for wear-resisting machine parts and for press tools that do not merit a more complex quality.

Equivalent grades:

  • BRITISH BS 970:1991 535A99
  • BRITISH BS 970:1955 EN31
  • SWEDISH SS 2258
  • AMERICAN SAE 52100

Chemical composition:

The following table shows the chemical composition of En31 steel:

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



Heat Treatment :

Heat treatment temperatures, including the rate of heating, cooling, and soaking times will vary due to factors such as the shape and size of each EN31 component. Other considerations during the heat treatment process including the type of furnace, quenching medium, and workpiece transfer facilities.