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H21
Qilu
Product Description
Hot forged H21 round bar and blocks, supplied annealed or QT to 36-50 HRC, with heat treatment and ultrasonic testing done in our own workshop.
Equivalent to: AISI H21 · DIN 1.2581 / X30WCrV9-3 · JIS SKD5 · GB 3Cr2W8V
Flat H21 SKD5 1.2581 X30WCrV9-3 Hot Work Tool Steel 3Cr2W8V
Flat H21 SKD5 1.2581 X30WCrV9-3 Hot Work Tool Steel 3Cr2W8V
Flat H21 SKD5 1.2581 X30WCrV9-3 Hot Work Tool Steel 3Cr2W8V
Supply form — Round bar, flats and blocks
Process — Hot forged / hot rolled
Condition — Annealed (≤ 255 HB), or QT to 36-50 HRC
Diameter range — 10-500 mm
Standard — ASTM A681
Certificate — EN 10204 3.1 standard, 3.2 on request
Lead time — 15-30 days
H21 is the tungsten hot-work tool steel of ASTM A681. With ~9 % tungsten it holds hardness at higher working temperature than the chromium hot-work grades (H11/H13) — the choice for brass and bronze die casting, steel hot-forging dies and hot-extrusion tooling where the die face runs red-hot.
| Element | C | Cr | W | V |
|---|---|---|---|---|
| ASTM A681 H21 | 0.26-0.36 | 2.50-4.00 | 8.50-10.00 | 0.30-0.60 |
Typical values for the QT condition.
| Property | Annealed | QT (typical) |
|---|---|---|
| Hardness | ≤ 255 HB | 36-50 HRC |
| Tensile strength, Rm (MPa) | — | 1300-1600 |
| Yield strength, Re (MPa) | — | ≥ 1100 |
| Impact, KV (J) | — | ≥ 15 |
| Standard | Designation |
|---|---|
| ASTM (USA) | H21 |
| DIN / EN (Germany/Europe) | 1.2581 / X30WCrV9-3 |
| JIS (Japan) | SKD5 |
| GB (China) | 3Cr2W8V |
| Werkstoff Nr. | 1.2581 |
Die casting — brass and bronze die-casting dies
Hot forging — steel forging dies for hammer and press lines
Extrusion — extrusion dies and mandrels for copper and steel
Hot shear — hot shear blades and piercing tools
H21 is hardened from 1100-1180 °C (higher than the chromium grades) in oil or air and tempered at 600-680 °C. The high tungsten content keeps hardness at red heat, which is exactly what is needed for brass die-casting and steel forging. Toughness is lower than the chromium grades, so section size and impact loading must be considered in the design.
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
H21 is a tungsten grade (9 % W) for hotter-running dies — brass die casting, steel forging. H13 is a chromium grade (5 % Cr) for aluminium die casting. H21 holds hardness higher; H13 is tougher. See our H13 page.
Yes. We supply H21 annealed for machining, or pre-hardened and rough-machined to your die-block dimensions, with UT and furnace charts.
EN 10204 3.1 mill certificate as standard. 3.2 with third-party witness (ABS, BV, CCS, GL) 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
