H10 1.2365 SKD7 hot work tool steel
1.2365 hot work tool steel delivers excellent hot hardness, superior wear resistance and thermal fatigue resistance. Perfect for copper alloy die casting dies, hot extrusion mandrels and high-temperature forging dies.
- Standard: AISI H10, DIN 1.2365, JIS SKD7, GB 4Cr3Mo3SiV
- Technique: EAF + LF + VD or ESR, forged, multi-directional forging ratio ≥4, stress-relief annealed
- Shape: Round, Flat, Plates, Blocks
- Heat treatment: Supplied in annealed condition, hardness ≤229 HBW; pre-hardened to 44–50 HRC (quenched and tempered) available on request
- Surface Treatment: Black (hot-rolled / forged surface), turned, milled / ground, sawn ends
- Tolerance: flat bars & plates thickness: +0.5/-0.0 mm (turned); forged blocks: ±0.2 mm
- MOQ: 1 Ton
We supply DIN 1.2365 in various custom sizes
flat size range
- Thickness: 6-200 mm
- Width: 40-1200 mm
block size range
- Thickness: 200-500 mm
- Width: 300-1000 mm
round size range
- Diameter: φ10-700 mm
Chemical Composition (%)
Steel Grade | C (%) | Si (%) | Mn (%) | Cr (%) | Mo (%) | V (%) | P (%) | S (%) |
AISI H10 | 0.35-0.45 | 0.80-1.20 | 0.25-0.70 | 3.00-3.75 | 2.00-3.00 | 0.25-0.75 | ≤0.030 | ≤0.030 |
GB 4Cr3Mo3SiV | 0.35-0.45 | 0.80-1.20 | 0.25-0.70 | 3.00-3.75 | 2.00-3.00 | 0.25-0.75 | ≤0.030 | ≤0.030 |
DIN 1.2365 | 0.28-0.35 | 0.10-0.40 | 0.15-0.45 | 2.70-3.20 | 2.60-3.00 | 0.40-0.70 | ≤0.030 | ≤0.030 |
JIS SKD7 | 0.28-0.35 | 0.10-0.40 | 0.15-0.45 | 2.70-3.20 | 2.50-3.00 | 0.40-0.70 | 0.030 | ≤0.020 |
Main characteristics of 1.2365 tool steel
- Excellent hot hardness - retains strength at high temperatures
- Superior wear resistance - resists abrasive and adhesive wear
- Good hardenability - uniform hardness in large sections
- Excellent machinability - easy to machine and polish
H10 | 1.2365 | SKD7 tool steel applications
1.2365 steel for Copper Alloy Die Casting Die
High molybdenum content grants 1.2365 superior resistance to softening at elevated temperatures, ideal for withstanding the extreme thermal load of copper alloy die casting.
1.2365 steel for Hot Extrusion Mandrel
Excellent hot hardness and creep resistance keep the mandrel dimensionally stable under sustained high-temperature cycles in aluminum and copper extrusion.
1.2365 steel for High-Temperature Forging Die
Superior temper resistance and thermal fatigue strength enable reliable performance in hot forging of alloys requiring high working temperatures.
Our Our Production Technology For H10 (1.2365) Hot Work Tool Steel
- EAF
- LF
- VD
- ESR
- Forged
- Spheroidizing Annealed
- Machined surface / Peeled
- Ultrasonic testing (UT) 100% as per SEP 1921, ASTM A388, or EN 10308
- Micro Cleanliness as per ASTM E45
- Grain size to be agreed upon between manufacturer and customer
- Spheroidized microstructure as per standard NADCA#207-2003
- Macrostructure, microstructure, grain size, and mechanical properties shall meet the standards specified in GB/T 1299-2025 for Tool and Die Steels
mechanical properties & heat treatment of 1.2365 steel
| Heat temperature | Start forging temperature | Finish forging temperature | Cooling method |
| 1130 – 1150 °C | 1100 – 900 °C (working range) | ≥ 900 – 850 °C (stop forging below this range) | Pit, sand, lime, mica, dry ashes, or furnace cooling |
Annealing
- Heat slowly to 780 – 850 °C (hot forming temperature: 1100-900°C)
- Hold for 4 – 6 hours (or 2 – 4 hours for smaller sections)
- Cool slowly in the furnace at a controlled rate (≤ 50 °C/h, or 10 – 20 °C/h) down to approximately 500 – 600 °C
- Then air cool to room temperature
- Hardness after annealing: max. 229 – 241 HB
Hardening
- Preheating: Recommended at 790 ± 15 °C (two-stage preheating is common: first at 600-650°C, second at 830-850°C)
-
Austenitizing temperature: 1000 – 1060 °C (typical working range).
For controlled atmosphere furnace: 1020 ± 6 °C
For salt bath: 1010 ± 6 °C
For air cooling applications: 970 – 990 °C - Holding time: 5 – 30 minutes (dependent on section thickness)
- Quenching media: Oil, air, or warm bath quenching (450 – 550 °C). Air-hardening is recommended for most applications to minimize distortion
- Hardness after quenching: 44 – 54 HRC
Stress relieving
- Perform after rough machining or heavy stock removal
- Heat slowly to 600 – 650 °C
- Hold for 1 – 2 hours (or 2 hours per 25mm section thickness)
- Furnace cool slowly to approximately 500 °C, then air cool, or cool directly in still air
Tempering
- Temper immediately after the workpiece cools to hand-warm temperature (approx. 50–70°C)
- Number of tempers: Minimum 2 times (double tempering is required)
- Holding time: 1 hour per 20mm of section thickness (minimum 2 hours)
- Cooling method: Air cool after each tempering cycle
- Optional third temper: For stress relief, perform a third temper at 30 – 50 °C below the highest tempering temperature
Why Choose NSPM as Your 1.2365 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.
