Cold work tool steel

DIN 1.2842 / AISI O2 Tool Steel Round & Flat

DIN 1.2842 / AISI O2 Tool Steel Round & Flat
DIN 1.2842 / AISI O2 Tool Steel Round & Flat
DIN 1.2842 / AISI O2 Tool Steel Round & Flat
DIN 1.2842 / AISI O2 Tool Steel Round & Flat



DIN 1.2842 / AISI O2 Tool Steel

DIN 1.2842 / AISI O2 Tool Steel is used for making tools (punches) and dies for blanking, punching and similar operations; threading and wood working tools, machine knives for the pulp, paper and metal working industries; measuring tools and plastic mould dies.

Round: dia.10-500 mm
Flat: 6-120 x 40-1200 mm
Block: 80-400 x 100-1200 mm
Delivery Condition
EAF+(ESR) or EAF+LF+VD+(ESR), Hot rolled or Forged, Spheroidizing Annealed, Black surface or Machined surface, UT SEP1921 Class3 D/d
O2 1.2842 ---- 9Mn2V+Cr
Chemical Composition(%)
Steel Grade C Si Mn P S Cr Mo V
1.2842 0.85-0.95 0.10-0.40 1.80-2.20 ≤ 0.030 ≤ 0.030 0.20-0.50 ---- 0.05-0.15
O2 0.85-0.95 ≤ 0.50 1.40-1.80 ≤ 0.030 ≤ 0.030 ≤ 0.50 ≤ 0.30 ≤ 0.30
9Mn2V 0.85-0.95 ≤ 0.40 1.70-2.00 ≤ 0.030 ≤ 0.030 ---- ---- 0.10-0.25

1. Cold work tool steel with high dimensional stability at heat treatment.

2. Very high cracking resistance. High machinability, medium thoughness and wear resistance. 

Heat Treatment


680 to 720°C

Slow controlled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air. Hardness af ter annealing: Max. 220 HB.


Stress relieving

Approx. 650°C

Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After through heating, hold in neutral atmosphere for 1-2 hours.



790 to 820°C

Oil, salt bath (200 to 250°C) up to 20 mm thickness. Holding time after temperature equalization: 15 to 30 minutes. Obtainable hardness: 63 - 65 HRC



Slow heating to tempering temperature immediately after hardening/time in furnace 1 hour for each 20 mm of work piece thickness, but at least 2 hours/cooling in air.For certain cases we recommend to reduce tempering temperature and increase holdingtime.

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