A2 Tool Steel Properties A2 Material Heat Treat, Hardness, Tensile Yield Strength

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A2 Steel – Tool, Die and Blade Steel

A2 steel is one of the most readily available and widely used tool steel grades. It has deep hardening, low distortion and high heat treatment safety, high resistance to high temperature softening and medium resistance to decarburization. It has a tendency to retain austenite. During tempering and double tempering, austenite is usually eliminated or reduced to a insignificant amount.

AISI Type A2 Tool Steel Properties

AISI type A2 tool steel properties are given in the tables below including chemical composition, physical and hardness, etc.

Chemical Composition

The following table list A2 steel chemical composition.

A2 Steel Composition, %
Standard AISI C Si Mn P, ≤ S, ≤ Cr Mo V
ASTM A681 A2 0.95-1.05 0.10-0.50 0.40-1.00 0.030 0.030 4.75-5.50 0.90-1.40  0.15-0.50

A2 Material Physical Properties

The following tables show AISI A2 material physical properties including density, melting point, specific heat, elastic modulus (modulus of elasticity), thermal conductivity, and coefficient of thermal expansion (CTE), etc.

Notes:

  • 10-6·K-1 = 10-6/K
  • 1 Ω·mm²/m = 1 μΩ·m
  • 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3
  • 1 GPa = 1 kN/mm2
  • 1 MPa = 1 N/mm2
A2 Seel Physical Properties Metric/SI Imperial
Density 7.86 g/cm3 0.284 lb/in3
Melting point 1425 °C 2600 °F
Specific heat capacity 460 J/kg·K at 20 °C  0.11 Btu/lb·°F at 68 °F
Elastic modulus (Modulus of Elasticity) 190 Gpa at 20 °C 27.5 x 103 ksi at 68 °F
185 GPa at 190 °C 26.9 x 103 ksi at 375 °F
180 GPa at 400 °C 24.6 x 103 ksi at 750 °F
Thermal conductivity 26.0 W/m·K at 20 °C 15.03 Btu/ft·h·°F at 68 °F
27.0 W/m·K at 190 °C 15.61 Btu/ft·h·°F at 375 °F
28.5 W/m·K at 400 °C 16.5 Btu/ft·h·°F at 750 °F
Coefficient of thermal expansion (CTE) 10.7 μm/m at 20-100 °C 5.96 μin./in.·°F at 70-200 °F
10.6 μm/m at 20-260 °C 5.9 μin./in.·°F at 70-500 °F
12.9 μm/m at 20-425 °C 7.2 μin./in.·°F at 70-800 °F
14.0 μm/m at 20-540 °C 7.8 μin./in.·°F at 70-1000 °F
14.2 μm/m at 20-650 °C 7.9 μin./in.·°F at 70-1200 °F

Mechanical Properties

The table below list mechanical properties of A2 tool steel including tensile strength, yield strength, elongation, reduction of area, etc.

Tempering temperature, °C (°F),
Hardened from 945 °C (1730 °F)
Hardness, HRC Ultimate tensile strength, MPa (ksi) Yield strength, MPa (ksi) Elongation in 50 mm, (2 in.), % Reduction of area, %
540 (1000) 54.1 1858.2 (269.5)
595 (1100) 46.7 1603.8 (232.6) 1269 (184) 5.0 13.9

Heat Treating A2 Tool Steel

The following heat treating of A2 tool steel including normalizing and annealing, hardening and tempering, etc.

Annealing Heat Treat

A2 steel annealing heat treat temperature: 845-870 °C (1550-1600 °F), rate of cooling: ≤22 °C/h (40 °F/h) to 705 °C (1300 °F), Brinell hardness is 201-229 HB. (Note: The upper limit of the range should be applied to the large section, while the lower limit for the smaller section. The time to maintain the temperature ranges from 1 hour for light steel to 4 hours for heavy steel and high-alloy steel large furnace charges.)

A2 Tool Steel Hardening and Tempering

Preheat temperature: 788 °C (1450 °F), Austenitizing temperature: 925-980 °C (1700-1800°F), minimum austenitizing holding time: 20-45 minutes (for furnace heat treatment. For pack hardening, hold for 30 min/in of pack cross-section); Quench medium: Air or nitrogenous gas; Quenched hardness: 62-65 HRC (varies with austenitizing temperature);

Tempering temperature: 175-540 °C (350-1000 °F).

Stress Relieving

Recommended temperature for stress relieving: 650-675 °C (1200-1250 °F)

Applications

  • Precision stamping dies,
  • Blanking die,
  • Die for cold forging, deep drawing and thread rolling,
  • High-speed blanking punch,
  • Stainless steel plate punch,
  • Drawing die,
  • Crimping die,
  • Embossing die,
  • Abrasive plastic molding die,
  • Thread rolling dies,
  • Trimming tools,
  • Gages,
  • Blades and knifes,
  • Punching and cutting tools for medium thickness material and sockets etc.

AISI A2 Steel Equivalent Material

AISI A2 steel equivalent materials are listed in the following table, including European EN (Germany DIN, British BSI, French NF…), ISO, Japanese JIS and Chinese GB standard (For reference).

A2 Steel Equivalent Material
US ISO European Union Japan China Australia India Rusia Korea
Standard AISI (UNS) Standard Steel Number (Designation) Standard Steel Number (Designation) Standard Steel Standard Name Standard Grade Standard Grade Standard Grade Standard Grade
AISI,
ASTM A681
A2 (T30102) ISO 4957 1.2363 (X100CrMoV5) EN ISO 4957 1.2363 (X100CrMoV5) JIS G4404 SKD12 GB/T 1299 Cr15Mo1V

Related Material: D2 Steel, SKD11 Steel, 1.2343 (X37CrMoV5-1)

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