A2 | 1.2363 | X100CrMoV5 | SKD12
- A2 air-hardening, medium-alloy, cold-work tool steels are a type of group A steels containing molybdenum and chromium. The carbon content in A2 tool steels is high. A2 tool steels can be deep hardened in order to minimize distortion.
- A2 is the most common grade of steel bar used to make tools for shaping metal, wood, and other materials. A2 medium-carbon chromium alloy steel is a member of the cold work tool steel group, designated by the American Iron and Steel Institute (AISI), which includes O1 low-carbon steel, A2 steel and D2 high-carbon high-chromium steel.A2 Tool Steel is a versatile, air-hardening tool steel that is characterized by good toughness and excellent dimensional stability in heat treatment.
Description
Chemical Composition
| Standard | Grade | C | Si | Mn | Cr | P | S | Mo | V |
| ASTM | A2 | 0.95-1.05 | 0.10-0.50 | 0.40-1.0 | 4.75-5.50 | 0.03 | 0.03 | 0.90-1.40 | 0.15-0.50 |
| JIS | SKD12 | 0.95-1.05 | 0.10-0.40 | 0.40-0.80 | 4.80-5.50 | 0.03 | 0.03 | 0.90-1.20 | 0.15-0.35 |
| DIN | 1.2363 | 0.95-1.05 | 0.20-0.40 | 0.40-0.70 | 4.80-5.50 | 0.03 | 0.03 | 0.90-1.20 | 0.10-0.30 |
Supply Range
Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.
Forged Round Bar: 20mm - 650mm (Dia)
Rolled Bars: 12mm - 360mm (Dia)
Forged flats: 30-400mm(T)*500-1200mm(W)
Rolled flats: 10-360mm(T)*30-1020mm(W)
Other sizes of O1 material or as per customer’s requirements
Heat Treatment
Forging
Heat the A2 slowly to 700°C then more rapidly to 1050-1100°C. Avoid working below 900°C. Reheat as often as necessary to maintain proper forging temperature. After forging cool very slowly.
Annealing
Soak thoroughly at 840-850°C, then slowly furnace cool at a rate of not more than 20°C per hour. After annealing A2 a maximum hardness of 215 Brinell may be achieved.
Stress relieving
After heavy grinding or machine it is advisable to stress relieve 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.
Hardening
Pre heat slowly to 600-700°C and soak. Continue heating to the final hardening temperature of 950/980°C and allow the component to equalise. Quench in oil or cool in air.
Tempering
Heat uniformly and thoroughly to the desired temperature and hold for 25 minutes per cm of thickness. A2 tool steel can be double tempering, after intermediate cooling to room temperature. Temper at 200°C for a balance of hardness and strength or 350°C where strength is more important than hardness.
Applications
Blanking dies, block and ring gauges, coining, cold forming, cold trimming and forming dies, cold shears, rolls, knurls and knurling tools, machine parts, mandrels, punches and punch plates, reamers, shear and slitter blades, stamping dies and threading tapes.
