P20/1.2311

P20/1.2311

Tool Steel

Tool and Die Steel Includes Cold Work Steel, Hot Work Steel, Plastic Mould Steel, High Speed Steel. These tool materials adhere to great quality demands of steel like temper, strength, toughness, resistance to tempering, hardening capacity, dimensional stability etc. The range of Tool Steel in our store includes products from renowned manufacturers.

Main characteristics and applications

Pre-hardened plastic mould steel with hardening penetration up to 400mm, with good polishing and texturing properties. This steel is suitable for nitriding (around 800 HV), chrome and nickel PVD plating. Used for plastic moulds with excellent surface finishing properties. It is also used for mould frames, plates, dies box, etc.

Comparable standards

DIN W.Nr AFNOR
40CrMnMo7 1.2311 1.2311

Chemical composition (typical; in weight %)

C Si Mn P(Max) S(Max) Ci Mo
0.35-0.45 0.20-0.40 1.30-1.60 0.03 0.03 1.80-2.10 0.15-0.25

Critical points

  • Ac1 740 °C
  • Ac3 820 °C
  • Ms 310 °C

Production technology

  • EAF – LF – VD – Forging – Heat treatment QT

US specification

  • In according to standard EN10228-3 Class 4 and standard SEP 1921 Class E/e

Delivery condition

  • WW.NR. 1.2311 is delivered in quenched and tempered condition, with hardness range 280 – 325 HB (29 – 35 HRC).

Physical properties (reference values)

20°C 100°C 200°C 500°C
Thermal expansion coefficient (10-6/K) 12.1 12.4 14.1
Thermal conductivity (W/mk) 36.1 36.2 33.5
Young modulus (Kn/mm2) 212 205 175

Heat treatment

TREATMENT TEMPERATURE HOLDING TIME (HT) COOLING COMMENTS
Annealing Heat to 700 - 720 °C Min. H.T. for 2 minute /mm Air or furnace In order to obtain hardness lower than 250 HB ( 24 HRC) to improve machinability
Stress relieving Heat to 560 - 600 °C (max 30 °C below tempering temperature) Min. H.T. for 2 minute /mm Air or furnace To be carried out after machining, is recommended to eliminate the residual stresses induced by mechanical working
Hardening Heat to 860-880°C Min. H.T. for 1 minute /mm Polymer -
Tempering In the range 550 – 600°C Min. H.T. for 3 minute /mm Air or furnace To be carried out after hardening. 2nd Tempering must be performed to max 30°C below tempering temperature