Data Sheet

What is Tool Steel

1. Tool Steel Definition

Tool steel contains various amounts of tungsten, molybdenum, cobalt and vanadium to improve the heat resistance and durability of the metal. This makes them ideal for cutting and drilling.

2.Tool steel grades and corresponding applications

Depending on the composition of the tool steel, the temperature range of forging or rolling, and the type of quenching, the grade of tool steel is wide. The general grades of AISI-SAE tool steel are O1, A2, and D2. These standard grades are considered "cold work steels" and can maintain their cutting edges at temperatures up to about 400 ° C. They have good hardness, wear resistance and deformation resistance.

O1 Tool Steel

O1 is an oil hardened steel with high hardness and good machinability. This grade of tool steel is mainly used for cutting tools and drill bits as well as knives and forks.

O1 mould steel
O1 is an oil quenching (cold work) die steel that can be quenched at relatively low temperatures.
O1 has the characteristics of deep hardening and high toughness. If higher wear resistance is required, other materials may be considered, such as air hardening A-2 or 0-2.
The workability grade of 0-1 is 65% to 75% of 1% carbon tool steel.
O1 sold in annealed state. Typical annealing hardness is BHN 187/221 Rc 10/18.
The maximum working hardness of 0-1 is BHN 722 Rc 64.
O1 can meet the requirements of ASTM-A681.
typical application
Blanking die / forming die / gauge / trimming die / spindle / collet
Chemical composition (typical value)
Carbon: 0.90% Silicon: 0.30% Manganese: 1.20% Chromium: 0.50% Tungsten: 0.50%

A2 Tool Steel

A2 is an air hardened steel containing a moderate amount of alloy material (chromium). It has good workability and a balance between wear resistance and toughness. A-2 is the most commonly used air hardened steel variety, usually used for blanking and forming punches, trimming dies and injection dies.

A2 is an air hardening (cold work) tool steel, and its wear performance is between 0-1 oil hardening and 0-2 air hardening.
A2 has good toughness, medium wear resistance and relatively easy machining. A-2 also has excellent non-deformation properties. These characteristics make A-2 a very popular and widely used material.
The machinability grade of A-2 is 65% of 1% carbon tool steel.
A2 is sold in annealed condition. Typical annealing hardness is BHN 197/241 Rc 12/22.
The maximum working hardness of A-2 is BHN 698 Rc 62.
A-2 can meet the requirements of ASTM-A681.
typical application
Blanking die/Compression mold / forming mold / trimming mold / die / drill sleeve / gauge / lamination mold
Chemical composition (typical value)
Carbon: 1.00% Silicon: 0.30% Manganese: 0.40% Chromium: 5.00% Molybdenum: 1.00% Vanadium: 0.20%

D2 Tool steel

D2 steel can be oil hardened or air hardened, and contains a higher percentage of carbon and chromium than O-1 and A-2 steels. After heat treatment, it has high wear resistance, toughness and low deformation. The higher carbon and chromium content of D-2 steel makes it ideal for applications requiring longer tool life.

D2 is a high carbon and chromium air hardening (cold work) tool steel.
D2 has excellent wear resistance and can be used in long-term applications requiring wear resistance. 0-2 can be processed in the annealed state. 0-2 represents the minimum deformation during heat treatment.
The 0-2 ass sub-workability grade of 1% carbon tool steel is 35% 10 40%.
D2 is sold in annealed condition. Typical annealing hardness is BHN 217/229 Rc 17/18.
The maximum working hardness of D-2 is BHN 710 Rc 63.
typical application
Stamping die / forming roller / forming die / punch / die / trimming die / label die / wear plate
Chemical composition (typical value)
Carbon: 1.50% Silicon: 0.30% Manganese: 0.40% Chromium: 12.00% Molybdenum: 1.00% Vanadium: 0.90%

Other tool steel grades contain a higher percentage of different types of alloys, such as high-speed steel M2, which can be selected for mass production. Various hot-worked steels can maintain sharp cutting edges at higher temperatures up to 1000 ° C.

3. Equivalent Too Steel from different coutries Standards.

Equivalent Tool Steel Specifications
U.S.A Germany Italy Japan France Spain
Britain BS4659 AISI/SAE W-Nr Din UNI Jis AFNOR UNE
B01 O1 1.251 95MnWCr5KU SKS3 90MnWCrV5 F.5220
100MnCrW4 90MWCV5 95MnCrW5
BD2 D2 X155CrVMo12-1 X155CrVMo121KU SKD11 X160CrMoV12-2832CDV12-28 F.520A
BD3 D3 1.208 X205Cr12KU SKD1 X200Cr12 F.5212
X210Cr12 Z200C12 X210Cr12
BD6 D6 1.2436
BA2 A2 1.2363 X100CrMoV511KU SKD12 X100CrMoV5Z F5.227
X100CrMoV5-1 100CDV5 X100CrMoV5
BH13 H13 1.2344 X40CrMoV511KU SKD61 X40CrMoV5 F.5318
X40CrMoV5-1 Z40CDV5 X40CrMoV5
BS1 S1 1.255 55WCrV8KU 55WC20 F.5241
60WCrV7 45WCrSi8
BP20 P20 1.2311
420 1.2083 SUS420J2 X40Cr13
X42Cr13 Z40C14
~BP30 1.2767 ~42NiCrMo157 SKH51- ~Y 35NCD16
BM2 M2 1.3343 Z85WDCV
S6 502 06-05-04-02
BM42 M42 1.3247 HS2-9-1-8 SKH59 Z110DKCWV
S2-1-1-8 09-08-04-02-01
BW2 W2 1.2833 105MV01
BS1407 1.2002 120C2

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