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SKT4
Qilu
Product Description
Hot forged SKT4 (1.2713) round bar and blocks, supplied annealed or QT to 34-44 HRC, with heat treatment and ultrasonic testing done in our own workshop.
Equivalent to: JIS SKT4 · DIN 1.2713 / 55NiCrMoV7 · ASTM ~L6 · GB 5CrNiMo
Flat Steel SKT4 1.2713/55NiCrMoV7 5CrNiMo L6 BH224/5 Hot Wor
Flat Steel SKT4 1.2713/55NiCrMoV7 5CrNiMo L6 BH224/5 Hot Wor
Flat Steel SKT4 1.2713/55NiCrMoV7 5CrNiMo L6 BH224/5 Hot Wor
Supply form — Round bar, blocks, die blocks
Process — Hot forged
Condition — Annealed (≤ 241 HB), or QT to 34-44 HRC
Diameter range — 50-800 mm
Standard — DIN EN ISO 4957 / JIS G4404
Certificate — EN 10204 3.1 standard, 3.2 on request
Lead time — 25-40 days for large die blocks
SKT4 (DIN 1.2713 / 55NiCrMoV7) is the standard hot-forging die steel. The ~1.5 % nickel gives toughness that survives the hammer impact of closed-die forging, while the moderate carbon (0.50-0.60 %) keeps the die face hard enough to resist wear. It is the grade specified for large die blocks on forging presses and hammers.
| Element | C | Si | Mn | Cr | Ni | Mo | V |
|---|---|---|---|---|---|---|---|
| DIN 1.2713 | 0.50-0.60 | 0.10-0.40 | 0.65-0.95 | 0.60-1.00 | 1.30-1.70 | 0.25-0.50 | 0.07-0.12 |
Typical values for the QT condition. Large die blocks are run at lower hardness to maximise toughness.
| Property | Annealed | QT (typical) |
|---|---|---|
| Hardness | ≤ 241 HB | 34-44 HRC |
| Tensile strength, Rm (MPa) | — | 1100-1400 |
| Yield strength, Re (MPa) | — | ≥ 900 |
| Impact, KV (J) | — | ≥ 40 |
| Standard | Designation |
|---|---|
| DIN / EN (Germany/Europe) | 1.2713 / 55NiCrMoV7 |
| JIS (Japan) | SKT4 |
| ASTM (USA) | ~L6 |
| GB (China) | 5CrNiMo |
| Werkstoff Nr. | 1.2713 |
Hot forging — closed-die forging blocks for hammers and presses
Die holders — die holders and adapters
Hot shear — hot shear blades for forging lines
Plastics — large mold bases and blocks
SKT4 is hardened from 830-870 °C in oil and tempered at 400-550 °C. For large forging die blocks the tempering cycle is tuned by the block size to reach the toughness level needed to survive hammer impact — we map hardness across the section to verify it.
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
SKT4 (1.2713) is a medium-carbon Ni-Cr-Mo steel run at 34-44 HRC for impact toughness on forging hammers. H13 (1.2344) is a 5 % Cr hot-work steel run at 44-52 HRC for die-casting and extrusion where heat resistance matters more than impact. See our H13 page.
Yes. We forge SKT4 up to 800 mm and can deliver pre-rough-machined die blocks with UT to ASTM A388 and full EN 10204 3.1 certification.
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
