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H12
Qilu
Product Description
Hot forged H12 round bar and blocks, supplied annealed or QT to 44-52 HRC, with heat treatment and ultrasonic testing done in our own workshop.
Equivalent to: AISI H12 · DIN 1.2605 / X35CrWMoV5 · JIS SKD62 · BS BH12
ASTM H12 SKD62 BH12 1.2605 X35CrWMoV5 Hot Work Tool Steel
ASTM H12 SKD62 BH12 1.2605 X35CrWMoV5 Hot Work Tool Steel
ASTM H12 SKD62 BH12 1.2605 X35CrWMoV5 Hot Work Tool Steel
Supply form — Round bar, flats, plates and blocks
Process — Hot forged / hot rolled
Condition — Annealed (≤ 235 HB), or QT to 44-52 HRC
Diameter range — 10-500 mm
Standard — ASTM A681
Certificate — EN 10204 3.1 standard, 3.2 on request
Lead time — 15-30 days
H12 is a tungsten-bearing hot-work tool steel from ASTM A681. It adds ~1 % tungsten to the H11/H13 Cr-Mo-V base, which raises hot strength and red hardness — the reason it is preferred over H13 for brass die-casting and high-temperature forging dies where the working face runs hotter.
| Element | C | Cr | W | Mo | V |
|---|---|---|---|---|---|
| ASTM A681 H12 | 0.30-0.40 | 4.75-5.50 | 1.00-1.50 | 1.25-1.75 | 0.20-0.50 |
Typical values for the QT condition.
| Property | Annealed | QT (typical) |
|---|---|---|
| Hardness | ≤ 235 HB | 44-52 HRC |
| Tensile strength, Rm (MPa) | — | 1450-1650 |
| Yield strength, Re (MPa) | — | ≥ 1200 |
| Impact, KV (J) | — | ≥ 18 |
| Standard | Designation |
|---|---|
| ASTM (USA) | H12 |
| DIN / EN (Germany/Europe) | 1.2605 / X35CrWMoV5 |
| JIS (Japan) | SKD62 |
| BS (UK) | BH12 |
| Werkstoff Nr. | 1.2605 |
Die casting — brass and copper die-casting dies, where working temperature is higher than for aluminium
Hot forging — forging dies for steel and high-temp alloys
Extrusion — extrusion dies for copper and brass
Tooling holders — die holders and adapter rings at elevated temperature
H12 is hardened from 1010-1040 °C in air or gas and double tempered at 540-620 °C to reach 44-52 HRC. The tungsten addition keeps hardness at working temperature — important when the die face runs hotter than aluminium die-casting service. Double tempering is required to stabilise dimension.
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
When the die face runs hotter than typical aluminium die-casting — brass or copper die casting, or hot forging of steel. The tungsten in H12 gives higher hot strength and red hardness. For standard aluminium die-casting H13 is more common; see our H13 page.
Yes. We quench and temper in our own shop to your target range, with hardness verified at multiple points and furnace charts recorded per batch.
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
