Tool Steel grades at a glance with ASTM specification and equivalent chart

Tool steels are a family carbon and alloy steels having distinct characteristics such as hardness, wear resistance, toughness, and resistance to softening at elevated temperatures.

Tool steels comprise carbide-forming elements such as chromium, vanadium, molybdenum and tungsten in different combinations. They also contain cobalt or nickel which improves their high-temperature performance. They are generally heat-treated to improve the hardness and used for stamping, forming, shearing and cutting metals and forming of plastics. They are classified according to their composition and properties into various categories.

Available Sectional Forms

Classifications

Tools steels fall into three basic categories:

  • Cold work tool steels
  • Hot work tool steels
  • High-speed tool steels

Cold-work steels are further subdivided into:

  • Air-hardening
  • Medium-alloy cold-work steels
  • High-carbon, high-chromium cold-work steels
  • Oil-hardening cold-work steels

Hot work steels are subdivided into:

  • Chromium
  • Tungsten
  • Molybdenum hot work steels

High-speed tool steels are divided into:

  • Molybdenum
  • Tungsten
  • Intermediate high-speed steels

Other types of tool steels include:

  • Water-hardening tool steels
  • Shock-resistant tool steels
  • Low-carbon tool steels
  • Low-alloy special purpose tool steels.

The following table shows the composition limits of various types of tool steels.

DesignationCompositiona, %
 AISIUNSCMnSiCrNiMoWVCo
Molybdenum high-speed steels
M1T113010.78-0.880.15-0.400.20-0.503.50-4.000.30 max8.20-9.201.40-2.101.00-1.35
M2T113020.78-0.88; 0.95-1.050.15-0.400.20-0.453.75-4.500.30 max4.50-5.505.50-6.751.75-2.20
M3, class 1T113131.00-1.100.15-0.400.20-0.453.75-4.500.30 max4.75-6.505.00-6.752.25-2.75
M3, class 2T113231.15-1.250.15-0.400.20-0.453.75-4.500.30 max4.75-6.505.00-6.752.75-3.75
M4T113041.25-1.400.15-0.400.20-0.453.75-4.750.30 max4.25-5.505.25-6.503.75-4.50
M7T113070.97-1.050.15-0.400.20-0.553.50-4.000.30 max8.20-9.201.40-2.101.75-2.25
M10T113100.84-0.94; 0.95-1.050.10-0.400.20-0.453.75-4.500.30 max7.75-8.501.80-2.20
M30T113300.75-0.850.15-0.400.20-0.453.50-4.250.30 max7.75-9.001.30-2.301.00-1.404.50-5.50
M33T113330.85-0.920.15-0.400.15-0.503.50-4.000.30 max9.00-10.001.30-2.101.00-1.357.75-8.75
M34T113340.85-0.920.15-0.400.20-0.453.50-4.000.30 max7.75-9.201.40-2.101.90-2.307.75-8.75
M35T113350.82-0.880.15-0.400.20-0.453.75-4.500.30 max4.50-5.505.50-6.751.75-2.204.50-5.50
M36T113360.80-0.900.15-0.400.20-0.453.75-4.500.30 max4.58-5.505.50-6.501.75-2.257.75-8.75
M41T113411.05-1.150.20-0.600.15-0.503.75-4.500.30 max3.25-4.256.25-7.001.75-2.254.75-5.75
M42T113421.05-1.150.15-0.400.15-0.653.50-4.250.30 max9.00-10.001.15-1.850.95-1.357.75-8.75
M43T113431.15-1.250.20-0.400.15-0.653.50-4.250.30 max7.50-8.502.25-3.001.50-1.757.75-8.75
M44T113441.10-1.200.20-0.400.30-0.554.00-4.750.30 max6.00-7.005.00-5.751.85-2.2011.00-12.25
M46T113461.22-1.300.20-0.400.40-0.653.70-4.200.30 max8.00-8.501.90-2.203.00-3.307.80-8.80
M47T113471.05-1.150.15-0.400.20-0.453.50-4.000.30 max9.25-10.001.30-1.801.15-1.354.75-5.25
M47T113481.42-1.520.15-0.400.15-0.403.50-4.000.30 max4.75-5.509.50-10.502.75-3.258.00-10.00
M62T113621.25-1.350.15-0.400.15-0.403.50-4.000.30 max10.00-11.005.75-6.501.80-2.10
Tungsten high-speed steels
T1T120010.65-0.800.10-0.400.20-0.403.75-4.500.30 max17.25-18.750.90-1.30
T2T120020.80-0.900.20-0.400.20-0.403.75-4.500.30 max1.0 max17.50-19.001.80-2.40
T4T120040.70-0.800.10-0.400.20-0.403.75-4.500.30 max0.40-1.0017.50- 19.000.80-1.204.25-5.75
T5T120050.75-0.850.20-0.400.20-0.403.75-5.000.30 max0.50-1.2517.50-19.001.80- 2.407.00-9.50
T6T120060.75-0.850.20-0.400.20-0.404.00-4.750.30 max0.40-1.0018.50-21.001.50- 2.1011.00-13.00
T8T120080.75-0.850.20-0.400.20-0.403.75-4.500.30 max0.40-1.0013.25-14.751.80- 2.404.25-5.75
T15T120151.50-1.600.15-0.400.15-0.403.75-5.000.30 max1.00 max11.75- 13.004.50-5.254.75-5.25
Intermediate high-speed steels
M50T113500.78-0.880.15-0.450.20-0.603.75-4.500.30 max3.90-4.750.80- 1.25
M52T113520.85-0.950.15-0.450.20-0.603.50-4.300.30 max4.00-4.900.75-1.501.65- 2.25
Chromium hot-work steels
H10T208100.35-0.450.25-0.700.80-1.203.00-3.750.30 max2.00-3.000.25-0.75
H11T208110.33-0.430.20-0.500.80-1.204.75-5.500.30 max1.10-1.600.30- 0.60
H12T208120.30-0.400.20-0.500.80-1.204.75-5.500.30 max1.25-1.751.00- 1.700.50 max
H13T208130.32-0.450.20-0.500.80-1.204.75-5.500.30 max1.10-1.750.80- 1.20
H14T208140.35-0.450.20-0.500.80-1.204.75-5.500.30 max4.00- 5.25
H19T208190.32-0.450.20-0.500.20-0.504.00-4.750.30 max0.30-0.553.75- 4.501.75-2.204.00-4.50
Tungsten hot-work steels
H21T208210.28-0.360.15-0.400.15-0.503.00-3.750.30 max8.50- 10.000.30-0.60
H22T208220.30-0.400.15-0.400.15-0.401.75-3.750.30 max10.00-11.750.25- 0.50
H23T208230.25-0.350.15-0.400.15-0.6011.00-12.750.30 max11.00-12.750.75- 1.25
H24T208240.42-0.530.15-0.400.15-0.402.50-3.500.30 max14.00-16.000.40- 0.60
H25T208250.22-0.320.15-0.400.15-0.403.75-4.500.30 max14.00-16.000.40- 0.60
H26T208260.45-0.55b0.15-0.400.15-0.403.75-4.500.30 max17.25- 19.000.75-1.25
Molybdenum hot-work steels
H42T208420.55-0.70b0.15-0.403.75-4.500.30 max4.50- 5.505.50-6.751.75-2.20
Air-hardening, medium-alloy, cold-work steels
A2T301020.95-1.051.00 max0.50 max4.75-5.500.30 max0.90-1.400.15-0.50
A3T301031.20-1.300.40-0.600.50 max4.75-5.500.30 max0.90-1.400.80- 1.40
A4T301040.95-1.051.80-2.200.50 max0.90-2.200.30 max0.90-1.40
A6T301060.65-0.751.80-2.500.50 max0.90-1.200.30 max0.90-1.40
A7T301072.00-2.850.80 max0.50 max5.00-5.750.30 max0.90-1.400.50- 1.503.90-5.15
A8T301080.50-0.600.50 max0.75-1.104.75-5.500.30 max1.15-1.651.00- 1.50
A9T301090.45-0.550.50 max0.95-1.154.75-5.501.25-1.751.30-1.800.80- 1.40
A10T301101.25-1.50c1.60-2.101.00-1.501.55-2.051.25-1.75
High-carbon, high-chromium, cold-work steels
D2T304021.40-1.600.60 max0.60 max11.00-13.000.30 max0.70-1.201.10 max
D3T304032.00-2.350.60 max0.60 max11.00-13.500.30 max1.00 max1.00 max
D4T304042.05-2.400.60 max0.60 max11.00-13.000.30 max0.70-1.201.00 max
D5T304051.40-1.600.60 max0.60 max11.00-13.000.30 max0.70-1.201.00 max2.50-3.50
D7T304072.15-2.500.60 max0.60 max11.50-13.500.30 max0.70-1.203.80-4.40
Oil-hardening cold-work steels
O1T315010.85-1.001.00-1.400.50 max0.40-0.600.30 max0.40-0.600.30 max
O2T315020.85-0.951.40-1.800.50 max0.50 max0.30 max0.30 max0.30 max
O6T315061.25-1.55c0.30-1.100.55-1.500.30 max0.30 max0.20-0.30
O7T315071.10-1.301.00 max0.60 max0.35-0.850.30 max0.30 max1.00-2.000.40 max
Shock-resisting steels
S1T419010.40-0.550.10-0.400.15-1.201.00-1.800.30 max0.50 max1.50-3.000.15-0.30
S2T419020.40-0.550.30-0.500.90-1.200.30 max0.30-0.600.50 max
S5T419050.50-0.650.60-1.001.75-2.250.50 max0.20-1.350.35 max
S6T419060.40-0.501.20-1.502.00-2.501.20-1.500.30-0.500.20-0.40
S7T419070.45-0.550.20-0.900.20-1.003.00-3.501.30-1.800.20-0.30d
Low-alloy special-purpose tool steels
L2T612020.45-1.00b0.10-0.900.50 max0.70-1.200.25 max0.10-0.30
L6T612060.65-0.750.25-0.800.50 max0.60-1.201.25-2.000.50 max0.20-0.30d
Low-carbon mold steels
P2T516020.10 max0.10-0.400.10-0.400.75-1.250.10-0.500.15-0.40
P3T516030.10 max0.20-0.600.40 max0.40-0.751.00-1.50
P4T516040.12 max0.20-0.600.10-0.404.00-5.250.40-1.00
P5T516050.10 max0.20-0.600.40 max2.00-2.500.35 max
P6T516060.05-0.150.35-0.700.10-0.401.25-1.753.25-3.75
P20T516200.28-0.400.60-1.000.20-0.800.40-2.000.30-0.55
P21T516210.18-0.220.20-0.400.20-0.400.50 max3.90-4.250.15-0.251.05-1.25A1
Water-hardening tool steels
W1T723010.70-1.50e0.10-0.400.10-0.400.15 max0.20 max0.10 max0.15 max0.10 max
W2T723020.85-1.50e0.10-0.400.10-0.400.15 max0.20 max0.10 max0.15 max0.15-0.35
W3T723051.05-1.150.10-0.400.10-0.400.40-0.600.20 max0.10 max0.15 max0.10 max

 

AISI-SAE tool steel grades

Defining propertyAISI-SAE gradeSignificant characteristics
Water-hardeningW 
Cold-workingOOil-hardening
AAir-hardening; medium alloy
DHigh carbon; high chromium
Shock resistingS 
High speedTTungsten base
MMolybdenum base
Hot-workingHH1–H19: chromium base
H20–H39: tungsten base
H40–H59: molybdenum base
Plastic moldP 
Special purposeLLow alloy
FCarbon tungsten

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RMT has diversified into multi-product group deals in allm form of sections in Stainless, Carbon, Tool, Die, Alloy Steels and Non-Ferrous and Pure Metals, Piping Solution, pipe Fittings, Flanges, Coils, Sheets, Strips and more in Wide Range of Sizes.

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