H11 1.2343 SKD6 hot work tool steel
H11 tool steel delivers exceptional impact toughness, thermal fatigue resistance, and high-temperature strength. With excellent hardenability and dimensional stability, ideal for various heavy-duty forging, die casting, and hot stamping dies.
- Standard: AISI H11, DIN 1.2343, JIS SKD6, GB 4Cr5MoSiV
- Technique: EAF + LF + VD or ESR, forged, multi-directional forging ratio ≥4, stress-relief annealed
- Shape: Flat, Round, Blocks
- Heat treatment: Supplied in annealed condition, hardness ≤235 HBW; pre-hardened to 38–42 HRC (quenched and tempered) available on request
- Surface Treatment: Black, turned, milled / ground, sawn ends
- Tolerance: flat bar thickness: +0.5/-0.0 mm (turned); forged blocks: ±0.2 mm
- MOQ: 1 Ton
We supply AISI H11 in various custom sizes
flat size range
- Thickness: 6-200 mm
- Width: 40-1200 mm
block size range
- Thickness: 200-600 mm
- Width: 300-1000 mm
round size range
- Diameter: φ10-800 mm
Chemical Composition (%)
Steel Grade | C | Si | Mn | P | S | Cr | Mo | V |
1.2343 | 0.33-0.41 | 0.80-1.20 | 0.25-0.50 | ≤ 0.030 | ≤ 0.030 | 4.80-5.50 | 1.10-1.50 | 0.30-0.50 |
H11 | 0.30-0.43 | 0.80-1.20 | 0.20-0.50 | ≤ 0.030 | ≤ 0.030 | 4.75-5.50 | 1.10-1.60 | 0.30-0.60 |
SKD6 | 0.32-0.42 | 0.80-1.20 | ≤ 0.50 | ≤ 0.030 | ≤ 0.020 | 4.50-5.50 | 1.10-1.50 | 0.30-0.50 |
4Cr5MoSiV | 0.33-0.43 | 0.80-1.20 | 0.20-0.50 | ≤ 0.030 | ≤ 0.030 | 4.75-5.50 | 1.10-1.60 | 0.30-0.60 |
Main characteristics of H11 tool steel
- Stable Heat Treatment — Minimal Distortion
- Consistent Performance — Longer Tool Life
- Thermal Shock Resistant — Reliable in Harsh Conditions
- High Toughness — Resist Cracking Under Stress
H11 | 1.2343 | SKD6 tool steel applications
H11 steel for Hot Stamping Die
H11 offers outstanding toughness and thermal fatigue resistance, ensuring durability under rapid heating and cooling cycles in hot stamping of high-strength steel sheets.
h11 steel for High-Speed Hammer Forging Die
With superior impact toughness and high-temperature strength, H11 reliably withstands the severe mechanical shock and thermal load in high-speed hammer forging.
h11 steel for Die Casting Die (Water-Coolable)
Exceptional resistance to heat checking and thermal shock makes H11 ideal for water-cooled die casting dies, extending life under intense cooling cycles.
Our production technology for H11 hot work tool steel
- EAF
- LF
- VD
- ESR
- Forged
- Spheroidizing Annealed
- EFS
- Machined surface
- UT 100% SEP1921 Class 3 D/d or E/e
- Spheroidized microstructure as per standard NADCA207-2003 AS1-AS9
- Macrostructure, microstructure, grain size, and impact toughness shall meet the standards specified in GB/T 1299-2025 for Tool and Die Steels.
mechanical properties & heat treatment of H11 steel
| Heat temperature | Start forging temperature | Finish forging temperature | Cooling method |
| 1120–1150°C | 1070–1150°C | > 900°CPit or sand cooling | Pit or sand cooling |
Annealing
- Heat to 860–890°C and hold for 3 hours.
- Furnace cool to 730–750°C, hold isothermally for 4 hours.
- Furnace cool to below 550°C, then air cool. Annealed hardness ≤ 229 HB.
Hardening
- Two-stage preheating: First heat to 600–650°C, then to 830–850°C.
- Austenitizing temperature: 1000–1030°C – hold for 15–30 minutes.
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Quenching media: Oil, air, or vacuum.
Oil quenching: 52–56 HRC; Air cooling: 50–54 HRC.
Stress relieving
- Heat to 600–650°C.
- Hold for 1–2 hours after reaching temperature.
- Furnace cool to approx. 500°C, then air cool.
Tempering
- Number of tempers: Minimum 2 times, 3 times recommended.
- 1st temper: 530–560°C – hold, then air cool.
- 2nd temper: Adjust within 530–650°C to achieve desired working hardness.
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3rd temper (optional): For stress relief – use a temperature 30–50°C lower than the highest tempering temperature.
Avoid tempering near 500°C (lowest toughness zone).
Why Choose NSPM as Your H11 Tool Steel Supplier
Source Direct
Direct mill cooperation ensures stable supply, competitive pricing, and consistent quality. Global resource integration and strong supply chain management guarantee reliable material sourcing and long-term availability.
Stock Ready
50,000+ tons inventory across 11 warehouses enables fast delivery. Flexible cutting, short lead times, and ready stock support urgent demands and improve customers’ production efficiency.
Expert Team
600+ professionals, including R&D specialists and technical engineers, provide application-driven support. Fast response and deep tooling knowledge ensure accurate solutions for diverse industrial needs.
Fully Inspected
Strict quality control system with full traceability, UT testing, and heat treatment records. Certified standards (ISO, CE) ensure every material meets high-performance and reliability requirements.
Full-Chain Machining
From steel supply to precision machining, heat treatment, and equipment manufacturing, NSPM offers integrated solutions that enhance accuracy, efficiency, and overall tooling performance.
