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

Description

Reviews

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.

Dimensions
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
Equivalence
AISI / SAE DIN / W.Nr JIS GB
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
Characteristics

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

Annealing

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.

 

Hardening

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

 

Tempering

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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