Cold work tool steel

JIS SKD11 Tool Steel

JIS SKD11 Tool Steel
JIS SKD11 Tool Steel
JIS SKD11 Tool Steel
JIS SKD11 Tool Steel

Description

Reviews

JIS SKD11 Cold Work Tool Steel
JIS SKD11 Cold Work Tool Steel is used for making different kinds of cold work molds with high accuracy and long service life, cutting tools and measuring instruments, such as complex-shaped piercing dies, threading screw plates, cold extrusion dies, cold cutting scissors, precision measuring tools etc.

Dimensions
Round: dia.10-700 mm
Flat: 6-120 x 40-1000 mm
Block: 80-400 x 100-1000 mm
Delivery Condition
EAF+(ESR) or EAF+LF+VD+(ESR), Hot rolled or Forged, Annealed, Black surface or Machined surface, UT SEP1921 Class3 D/d
Equivalence
AISI / SAE DIN / W.Nr JIS GB
D2 1.2379 SKD11 Cr12Mo1V1
Chemical Composition(%)
Steel Grade C Si Mn P S Cr Mo V
SKD11 1.40-1.60 ≤ 0.40 ≤ 0.60 ≤ 0.030 ≤ 0.030 11.00-13.00 0.80-1.20 0.20-0.50
1.2379 1.45-1.60 0.10-0.60 0.20-0.60 ≤ 0.030 ≤ 0.030 11.00-13.00 0.70-1.00 0.70-1.00
D2 1.40-1.60 0.10-0.60 0.20-0.60 ≤ 0.030 ≤ 0.030 11.00-13.00 0.70-1.20 0.50-1.10
Characteristics

1. With good hardenability and wear resistance.

2. With high oxidation resistance, good corrosion resistance after quenching and polishing, small deformation after heat treatment.

Forging Technique
Heat Temperature Start Forging Temperature Finish Forging Temperature Cooling Method
1120-1160 °C 1050-1090 °C ≥850 °C Thermal Annealing
Heat Treatment

Annealing

800 to 850°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 after annealing: max. 255 HB.

 

Stress relieving

650 to 700°C

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

 

Hardening

1020 to 1040°C

Complex shapes/air, simple shapes/air blast, oil, salt bath from (220 to 250°C or 500 to 550°C).

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 1hour for each 20 mm of work piece thickness, but at least 2 hours/cooling in air. For average hardness figures to be obtained, please refer to the tempering chart. For certain cases we recommend to reduce tempering temperature and increase holding time. For certain applications requiring improved retention of hardness, a nitriding treatmentis recommended.

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