HP1 Die Steel Blocks
HP1 tool steel, ESR-refined for high purity, delivers excellent impact toughness, superior hot strength and reliable thermal shock resistance. It suits die casting, extrusion and hot forming dies perfectly.
- Standard: HP1
- Technique: Forged
- Shape: Block
- Heat treatment: Annealed / Q+T
- Surface Treatment: Black, Machined
- Tolerance: +/- 1%
- MOQ: 1
We supply HP1 in various custom sizes
block size range
- Thickness: ≤700 mm
- Width: ≤1200 mm
Chemical Composition (%)
Grade | C | Si | Mn | P (≤) | S (≤) | Cr | Mo | V |
HP1 | 0.35 | 0.20 | 0.30 | 0.012 | 0.003 | 5.2 | 1.40 | 0.55 |
Main characteristics of HP1 tool steel
- ESR-refined microstructure – high purity & uniformity
- Outstanding impact toughness – resists heavy-load cracking
- Superior hot strength – stable hardness at high temps
- Good thermal shock resistance – withstands rapid thermal cycles
HP1 tool steel applications
HP1 steel For Die casting
ESR-refined for high-purity microstructure, HP1 steel offers strong thermal fatigue resistance and toughness, effectively resisting heat checking to extend die casting tool service life.
HP1 steel extrusion industries
Boasting exceptional hot strength and excellent wear resistance, this grade withstands continuous high-pressure thermal loads, retaining stable precision for long-running extrusion production.
HP1 steel for hot forming
With reliable thermal shock resistance and excellent dimensional stability, HP1 steel adapts well to cyclic temperature changes and delivers consistent accuracy in hot forming processes.
Our production technology for HP1 KIND&CO Die Steel
- Melting
- Forging
- Hardening & Annealing
- Finishing
- Stock & Sawing
- Machining
- Vacuum Hardening
- 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 HP1 steel
| Heat temperature | Start forging temperature | Finish forging temperature | Cooling method |
| 1120-1150 °c | 1050-1100 °c | 900-850 °c | Pit or sand cooling |
Annealing
- Temperature: 820 - 840 ℃, 4 – 6 h
- Cooling: slow cooling in furnace
Hardening
- Temperature: 1020 ℃, Soaking time 60 min
- Cooling: Air, nitrogen gas at vacuum hardening, martempering at 540 ℃, oil or polymer (to be interrupted at 230 – 280 ℃
Stress relieving
- Temperature: approx. 650 ℃, 2 – 4 h
- Cooling: slow cooling
Why Choose NSPM as Your HP1 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.
