H11 Tool Steel / DIN 1.2343 / JIS SKD6 / GOST 4Х5МФС
H11 tool steel is an internationally recognized medium-temperature, high-toughness hot-work tool steel. Its defining characteristic lies in its balanced, outstanding comprehensive properties—achieving an exceptional equilibrium between high strength and high toughness. Its composition is precisely optimized, featuring key alloying elements such as chromium (Cr), molybdenum (Mo), and vanadium (V). The synergistic effect of these elements endows it with exceptional resistance to high-temperature softening, outstanding toughness, and superior thermal fatigue resistance and thermal melting loss properties. In essence, H11 is a mould material tailor-made for withstanding environments involving repeated high-temperature thermal stresses.
Product Description
Xiri Tool Steel is a leading supplier of AISI H11 tool steel (DIN 1.2343) in China. H11 is a type of air-cooled hardening hot working tool steel, featuring excellent toughness and resistance to thermal fatigue. It is mainly used for manufacturing aluminum and magnesium alloy die-casting molds, hot extrusion molds, and hot punches that are subjected to high loads at high temperatures.
Whether you need H11 flat bars, 1.2343 steel plates, or 4Х5МФС forged rounds, we provide custom dimensions with machining or grinding services. Our materials are strictly tested to ensure premium metallurgical structure.
H11 tool steel is an internationally recognized medium-temperature, high-toughness hot-work tool steel. Its defining characteristic lies in its balanced, outstanding comprehensive properties—achieving an exceptional equilibrium between high strength and high toughness. Its composition is precisely optimized, featuring key alloying elements such as chromium (Cr), molybdenum (Mo), and vanadium (V). The synergistic effect of these elements endows it with exceptional resistance to high-temperature softening, outstanding toughness, and superior thermal fatigue resistance and thermal melting loss properties. In essence, H11 is a mould material tailor-made for withstanding environments involving repeated high-temperature thermal stresses.
Equivalent Grades of H11 Steel
| USA AISI |
Germany DIN |
Japan JIS |
GOST | China GB |
| H11 | 1.2343 | SKD6 | 4Х5МФС | 4Cr5MoSiV |
Chemical Composition of AISI H11 / DIN 1.2343 tool steel
| C | Si | Mn | Cr | P | S | Mo | V |
| 0.36-0.42 | 0.90-1.20 | 0.30-0.50 | 4.80-5.80 | max 0.030 | max 0.030 | 1.10-1.40 | 0.25-0.50 |
Supply Form & Size Range of AISI H11 / DIN 1.2343 tool steel
We supply AISI H11 / DIN 1.2343 steel in various forms to meet your manufacturing needs:
Round bar: Diameter 10mm – 1000mm
Steel Plate / Flat: Thickness 10mm – 900mm x Width 200mm – 1500mm
Surface: Black, Peeled, Rough machined or Grinded.
Delivery Condition: Annealed (Hardness 229 HB max.)
Core Performance of H11 Tool Steel
For professionals prioritising efficiency and cost-effectiveness, H11 tool steel delivers tangible productivity enhancements:
Exceptional thermal strength and red hardness: Maintains dimensional accuracy and structural integrity at sustained operating temperatures of 500–600°C, resisting hardness degradation (softening) and preventing deformation or collapse due to elevated heat.
Exceptional thermal fatigue resistance: Demonstrates remarkable resilience against reticular cracking (thermal fatigue cracks) on mould surfaces caused by repeated rapid heating and cooling cycles. This significantly extends service life under demanding thermal cycling conditions and reduces unplanned downtime.
Superior Toughness Reserve: Maintains significantly higher toughness than conventional hot-work tool steels even under high stresses, withstanding impact loads, mechanical stresses, and operational mishaps. This reduces the risk of cracking and chipping, enhancing production safety.
Superior Resistance to Melting Damage and Wear: Exhibits strong resistance to erosion and adhesion from molten metals (particularly aluminium and magnesium), coupled with excellent wear resistance. This effectively protects the mould surface, extends polishing intervals, and stabilises product surface quality.
High Quenchability and Dimensional Stability: Delivers outstanding quenching performance, ensuring uniform properties throughout the core of larger-section moulds. Minimal heat treatment distortion facilitates precise machining and seamless assembly.
Outstanding cost-effectiveness: Compared to higher-grade, super-alloy hot-work tool steels, H11 offers exceptional value for money. Its comprehensive performance delivers extended service life, reduced downtime for replacements, and lower maintenance costs, significantly enhancing long-term return on investment.
AISI H11 Tool Steel Applications | A Reliable Partner in High-Temperature Environments
Leveraging its unique performance advantages, H11 tool steel excels in numerous high-temperature, high-pressure, and high-wear industrial scenarios:
Aluminium/Magnesium Alloy Die Casting Moulds: A preferred material for manufacturing aluminium/magnesium alloy die casting moulds for automotive components and 3C product casings. Particularly suitable for complex structures with stringent thermal fatigue life requirements, such as cores, cavities, and slides.
Hot Extrusion Dies: Employed in hot extrusion die heads, die pads, mandrels and other components for copper alloys, aluminium alloys, magnesium alloys, enduring prolonged exposure to high-temperature, high-pressure extrusion.
Hot Forging Dies: Suitable for small-to-medium forging inserts, punches and similar components in precision forgings, connecting rods, gears and other workpieces.
Plastic moulds (high-temperature engineering plastics): When processing high-melting-point, high-viscosity engineering plastics like PEEK and PPS, H11 moulds demonstrate superior corrosion resistance and wear resistance.
Other applications: Such as copper alloy gravity casting moulds, core pins, and hot trimming tools.
Our advantages in Processing H11 Tool Steel
The outstanding performance of H11 tool steel is no accident, underpinned by rigorously controlled smelting, forging, and heat treatment processes:
High-Purity Smelting: Employing advanced smelting techniques, we strictly control impurity levels of sulphur, phosphorus, and non-metallic inclusions within the steel, ensuring high purity and compositional uniformity. This forms the foundation for exceptional toughness and stable service life.
Advanced Forging and Processing: Precision forging techniques and processes such as electroslag remelting significantly enhance the steel’s density, uniformity, and orientation. This further eliminates potential internal defects, elevating the overall reliability of the mould.
Precise Heat Treatment: Optimised heat treatment processes (including preheating, quenching, and tempering) meticulously control grain size and carbide distribution. The core lies in multiple high-temperature tempering cycles following high-temperature quenching, inducing pronounced secondary hardening effects. This maximises the material’s strength, toughness, and thermal stability, ensuring it retains sufficient high-temperature hardness even at operating temperatures around 600°C. This stage is critical to the final mould’s performance and service life.
Not sure about the best equivalent for your application?
Why Manufacturers Choose Huangshi Xiri
Huangshi Xiri combines international-standard steel grades, a complete tool steel portfolio, strict quality control and reliable global supply. We match DIN / JIS / AISI equivalents precisely, offer cutting and heat-treatment services, and control every step from smelting to inspection. With stable capacity, on-time delivery and responsive technical support, we help manufacturers reduce risk, save costs and run production with confidence.
Contact Us
Contact Huangshi Xiri today for quotations, grade selection and technical support on tool steel, mold steel and alloy steel. Whether you need samples, cutting-to-size service or long-term supply for your projects, our engineers and sales team are ready to respond quickly with professional advice and reliable solutions for your manufacturing needs.
