Ningbo Ningshing Precision Machinery Group Co., Ltd.Who We AreNo.25 Hongxiang Rd A area Industry, Hongtang Jiangbei, Ningbo, 315033, Zhejiang Province, ChinaFormerly known as Ningbo Ningshing Special-Steel Group Co., Ltd., we are a holding subsidiary of Ningbo Ningshing Holdings Corporation. After years of development, we have successfully realized the transformation of "industry supply chain ecosystem" from only trading to integrated operation, including distribution and retail, precision processing, intelligent manufacturing, vacuum heat treatment, technical services and international trade, etc. As one of the largest special steel distribution enterprises in China with imported and homemade tool steel materials, Ningshing P

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

DIN 1.2842 / AISI O2 Tool Steel Round & Flat

Model NO.
tool steel 1.2842
Minimum order quantity:

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



Chemical Composition(%)

Steel Grade CSiMnPSCrMoV
1.28420.85-0.950.10-0.401.80-2.20≤ 0.030 ≤ 0.030 0.20-0.50----0.05-0.15
O20.85-0.95≤ 0.50 1.40-1.80≤ 0.030 ≤ 0.030 ≤ 0.50 ≤ 0.30 ≤ 0.30
9Mn2V0.85-0.95≤ 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.

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

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.

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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