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ASTM A681 AISI A2 tool steel
AISI A2 tool steel is one of 'A' group cold works steel in ASTM A681 standard. A2 Tool Steel is a versatile, air hardening chromium alloy tool steel that replaces O1 tool steel when safer hardening, less distortion and increased wear resistance are required. AISI type A2 steel is intermediate in wear resistance between O1 oil-hardening tool steel and D2 high-carbon, high-chromium tool steel.
AISI Steel A2 is heat treatable and will offer a hardness in the range 57-62 HRC. ASTM grade A2 steel delivers good toughness with medium wear resistance and is relatively easy to machine. Tool Steels A2 are used in many applications which require good wear resistance as well as good toughness
1.Supply Range of ASTM A2 Tool Steel
A2 Tool Steel Round Bar: diameter 8mm - 800mm
A2 Steel Plate: thickness 2mm -300mm x width 200mm - 800mm
Other sizes of A2 steel or as per customer's requirements
| Country | USA | German | Japan | British |
| Standard | ASTM A681 | DIN EN ISO 4957 | JIS G4404 | BS 4659 |
| Grades | A2/T30102 | 1.2363/X100CrMoV5 | SKD12 | BA2 |
| ASTM A681 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| A2/T30102 | 0.95 | 1.05 | 0.40 | 1.00 | 0.03 | 0.03 | 0.10 | 0.50 | 4.75 | 5.50 | 0.15 | 0.50 | 0.90 | 1.40 |
| DIN ISO 4957 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| 1.2363/X100CrMoV5 | 0.95 | 1.05 | 0.40 | 0.80 | 0.03 | 0.03 | 0.10 | 0.40 | 4.80 | 5.50 | 0.15 | 0.35 | 0.90 | 1.20 |
| JIS G4404 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| SKD12 | 0.95 | 1.05 | 0.40 | 0.80 | 0.03 | 0.03 | 0.10 | 0.40 | 4.80 | 5.50 | 0.15 | 0.35 | 0.90 | 1.20 |
| BS 4659 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| BA2 | 0.95 | 1.05 | 0.30 | 0.70 | 0.035 | 0.035 | . . . | 0.40 | 4.75 | 5.25 | 0.15 | 0.40 | 0.90 | 1.10 |
| Temperature | 68°F | 375°F | 750°F |
| (20°C) | (200°C) | (400°C) | |
| Density | |||
| lbs/in3 | 0.279 | 0.277 | 0.275 |
| kg/m3 | 7 750 | 7 700 | 7 650 |
| Modulus of elasticity | |||
| psi | 27.5 x 106 | 26.9 x 106 | 24.6 x 106 |
| N/mm2 | 190 000 | 185 000 | 170 000 |
| Coefficient of thermal expansion | |||
| per °F from 68°F | - | 6.5 x 10-6 | - |
| per °C from 20°C | - | 11.6 x 10-6 | - |
| Properties | Metric | Imperial |
| Hardness, Rockwell C (as air-hardened (63-65 HRC average), 60-62 HRC at 205°C, 59-61 HRC at 260°C, 58-60 HRC at 315°C, 57-59 HRC at 370°C and 425°C and 480°C, 56-58 HRC at 540°C, 50-52 HRC at 595°C, 42-44 HRC at 650°C) | 64 | 64 |
| Bulk modulus (typical for steels) | 140 GPa | 20300 ksi |
| Machinability (based on carbon tool steel) | 65% | 65% |
| Shear modulus | 78.0 GPa | 11300 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
| Elastic modulus | 190-210 GPa | 27557-30457 ksi |
Heating A2 steel for forging must be done slowly and uniformly. Heat the steel A2 slowly to 700°C then more rapidly to 1050-1100°C. Avoid working below 899°C(1650°F). Reheat AISI A2 steels as often as necessary to maintain proper forging temperature. After forging cool very slowly in lime, mica, dry ashes or furnace. AISI A2 steel should always be annealed after forging.
After heavy grinding or machine it is advisable to stress relieve tool steel A2 to reduce the danger of cracking or distortion during subsequent heat treatments. Heat slowly to 670-700°C, soak for a minimum of two hours per 25mm of section then cool down in the furnace.
To prevent decarburization use a controlled atmosphere furnace or pack in a sealed container using some inert material. To anneal A2 tool steel for lowest hardness, heat slowly to 899°C(1650°F) and hold at this temperature for about two hours per inch of greatest cross-section. Cool steel A2 at a rate of 20°F (10°C) per hour to 650°C (1200°F) and reheat to 732°C (1350°F); hold 3 hours per inch of greatest cross-section; furnace cool at 20 degrees per hour to 593°C (1100°F); then furnace-cool to 482°C (900°F) and air-cool.
Preheating temperature: 1200-1380°F (650-750°C). Austenitizing temperature: 1700 -1780°F (925-970°C) but usually 1720-1760°F (940-960°C).
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