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A2 SKD12
Qilu
Product Description
Hot forged A2 round bar and flats, supplied annealed for machining or pre-hardened to 57-62 HRC, with heat treatment and ultrasonic testing done in our own workshop.
Equivalent to: AISI A2 · DIN 1.2363 / X100CrMoV5 · JIS SKD12 · GB Cr5Mo1V
A2 SKD12 1.2363 BA2 Cr5Mo1V X100CrMoV5 Cold Work Tool Steel
A2 SKD12 1.2363 BA2 Cr5Mo1V X100CrMoV5 Cold Work Tool Steel
A2 SKD12 1.2363 BA2 Cr5Mo1V X100CrMoV5 Cold Work Tool Steel
Supply form — Round bar, flats and plates
Process — Hot forged / hot rolled
Condition — Annealed (≤ 241 HB), or pre-hardened to 57-62 HRC
Diameter range — 10-400 mm
Standard — ASTM A681
Certificate — EN 10204 3.1 standard, 3.2 on request
Lead time — 15-30 days
A2 is the air-hardening medium-chromium cold-work tool steel from ASTM A681. With 5 % chromium and 1 % carbon it sits between D2 (12 % Cr, harder, more wear) and O1 (low alloy, tougher): it gives D2-like wear resistance with better toughness, and air-hardens for minimal distortion in quench — the choice for precision stamping and forming dies.
| Element | C | Mn | Si | Cr | Mo | V |
|---|---|---|---|---|---|---|
| ASTM A681 A2 | 0.95-1.05 | 1.00 max | 0.50 max | 4.75-5.50 | 0.90-1.40 | 0.15-0.50 |
Typical values. A2 is air-hardening, so distortion in heat treatment is low — important for precision dies.
| Property | Annealed | Hardened (typical) |
|---|---|---|
| Hardness | ≤ 241 HB | 57-62 HRC |
| Tensile strength, Rm (MPa) | — | ≈ 1750 |
| Impact, KV (J) | — | ≥ 18 |
| Wear resistance | — | High (better than O1, less than D2) |
| Standard | Designation |
|---|---|
| ASTM (USA) | A2 |
| DIN / EN (Germany/Europe) | 1.2363 / X100CrMoV5 |
| JIS (Japan) | SKD12 |
| GB (China) | Cr5Mo1V |
| Werkstoff Nr. | 1.2363 |
Stamping — precision stamping and blanking dies
Forming — forming, coining and drawing dies
Cutting — shear blades and slitting knives
Plastics — mold cavities for glass-filled plastics
A2 is hardened from 940-980 °C in air and tempered at 180-220 °C (for max hardness) or 350-400 °C (for toughness). Air-hardening keeps distortion low, which is why A2 is preferred for precision dies that must hold tight tolerances through heat treatment.
Most suppliers in this business are traders who subcontract everything. We run our own processes, which means shorter cycles and one point of accountability when something needs fixing.
Heat treatment shop — quenching, tempering and vacuum heat treatment to your target hardness, with furnace charts recorded per batch
Machining shop — rough turning, peeling, milling and cutting to length, so your bar or block arrives ready for finish machining
Testing — ultrasonic per ASTM A388 / EN 10228-3, hardness mapping across the section, microstructure on request
Certification — EN 10204 3.1 as standard, 3.2 available with third-party witness (ABS, BV, CCS, GL)
Export packing — bundled, end-capped and rust-protected for sea freight
A2 sits between them. D2 (12 % Cr) gives maximum wear resistance but is brittle; O1 (low alloy) is toughest but wears faster. A2 (5 % Cr) gives D2-like wear with O1-like toughness, and air-hardens for low distortion. See our D2 page and O1 page.
Yes. We heat treat to 57-62 HRC, rough-machine to size and ultrasonically test. Pre-hardened blanks arrive ready for finish machining.
EN 10204 3.1 mill certificate as standard. 3.2 with third-party witness on request.
Send us your grade, dimensions, quantity, required hardness and destination port. You will get a quotation with the full technical proposal within 24 hours.
Email: enquiry@qilumetal.com | Web: www.qilumetal.com
