1.2379 Tool Steel / AISI D2 / JIS SKD11
1.2379 is a high-carbon, high-chromium cold-work tool steel characterised by its elevated carbon content (approximately 1.55%) and rich alloying elements including chromium (around 12%), molybdenum, and vanadium. Through optimised chemical composition and heat treatment processes, it achieves an exceptional balance between wear resistance, toughness, and dimensional stability, establishing itself as the “hardcore performer” in modern industrial wear-resistant applications.
Product Description
Xiri Tool Steel is a leading supplier of DIN 1.2379 tool steel in China. This grade is a high-carbon, high-chromium cold-work tool steel, it achieves an exceptional balance between wear resistance, toughness, and dimensional stability, establishing itself as the “hardcore performer” in modern industrial wear-resistant applications.
Whether you need 1.2379 flat bars, D2 round bars, we provide custom dimensions with machining or grinding services. Our materials are strictly tested to ensure premium metallurgical structure.
1.2379 is a high-carbon, high-chromium cold work tool steel exhibiting exceptional wear resistance and good toughness. It is commonly employed in the manufacture of precision cold work dies and cutting tools subjected to high stresses.
Equivalent Grades of 1.2379 Steel
| EU EN |
Germany DIN |
Japan JIS |
France AFNOR |
England BS |
China GB |
USA AISI |
| X153CrMoV12-1 | 1.2379 | SKD11 | Z160CDV12 | BD2 | Cr12Mo1V1 | D2 |
Chemical Composition of DIN 1.2379 / AISI D2 tool steel
| C | Si | Mn | P | S | Cr | Mo | V |
| 1.50-1.60 | 0.10-0.40 | 0.15-0.45 | max 0.030 | max 0.030 | 11.50-12.50 | 0.70-0.80 | 0.70-1.10 |
Supply Form & Size Range of 1.2379 / AISI D2 tool steel
We supply 1.2379 / D2 steel in various forms to meet your manufacturing needs:
Round bar: Diameter 10mm – 800mm
Steel Plate / Flat: Thickness 10mm – 400mm x Width 200mm – 800mm
Surface: Black, Peeled, Rough machined or Grinded.
Delivery Condition: Annealed (Hardness 255 HB max.)
Core Performance of 1.2379 D2 Tool Steel | Forging Exceptional Capabilities
Superior Wear Resistance: Its high-carbon, high-chromium core formulation generates abundant hard, wear-resistant chromium carbides upon quenching and tempering. This ensures your cutting edges remain sharper for longer, while mould cavities withstand greater abrasion. Significantly reducing downtime for replacements, it effectively boosts equipment utilisation.
Outstanding Toughness: Despite its exceptional hardness, 1.2379 steel retains excellent toughness through precise heat treatment control. This prevents brittle fracture or chipping under impact loads and localised stress concentrations, ensuring safe and stable operation in demanding conditions.
Superior Dimensional Stability: Through meticulously engineered quenching and multiple high-temperature tempering processes, residual austenite within 1.2379 steel undergoes complete transformation, resulting in a stable microstructure. This delivers exceptional resistance to deformation, ensuring precision moulds and cutting tools maintain dimensional accuracy during prolonged use or temperature fluctuations, thereby guaranteeing consistent product batches.
Good Quenchability: Benefiting from a rational alloying element composition, 1.2379 steel achieves a deep hardened layer. Even large-section components attain uniform hardness and properties, meeting the demands of large, complex moulds and components.
Machinability and polishability:
Demonstrates excellent machinability in the annealed condition, facilitating the production of intricate geometries. Following appropriate heat treatment, surfaces can achieve exceptionally high finishes, meeting applications demanding superior surface quality.
1.2379 Cold Work Tool Steel Applications
Cold work dies:
Cutting dies, stamping dies, bending dies, forming dies, drawing dies, extrusion dies, etc. Particularly suited for precision dies demanding high wear resistance and chipping resistance.
Cutting and forming tools:
High-demand shear blades, trimming tools, precision gauges, thread rolling dies, thread rolling plates, etc.
Wear-resistant components: Bearings, bushings, guide rails, slides, and other mechanical parts requiring high wear resistance and impact tolerance.
Plastic moulds: Critical components such as inserts, slides, and ejector pins demanding exceptional wear resistance.
Our Advantages in Processing 1.2379 Tool Steel
We fully recognise that exceptional performance must be built upon a solid foundation of quality. To ensure every batch of 1.2379 tool steel achieves the peak condition you expect, we implement a stringent quality assurance system throughout the entire production process:
Source Control: Premium raw materials are meticulously selected, with strict incoming inspection protocols ensuring chemical composition purity and compliance with standard requirements.
Precision Smelting and Forging: Employing advanced electric arc furnace or electroslag remelting techniques to minimise impurities and segregation. Subsequent multi-directional forging using heavy-duty presses thoroughly breaks down cast structures, eliminates internal defects, and achieves a dense, uniform forged microstructure with optimally distributed flow lines.
Precision Heat Treatment: Quenching and tempering conducted in equipment featuring precise temperature control and atmosphere protection. Rigorous control of temperature, duration, and cooling rates is central to achieving target hardness, superior toughness, and stability. We implement multi-stage tempering processes to ensure complete transformation of retained austenite and effective stress relief.
End-to-End Inspection: From raw materials to finished products, stringent physical, chemical, and non-destructive testing is conducted throughout the entire process:
Chemical Composition Analysis: Ensures precise compliance with elemental content specifications.
Non-destructive testing: (e.g., ultrasonic testing) identifies internal cracks, inclusions, and other defects.
Hardness testing: Multi-point inspection guarantees uniform hardness across the entire cross-section.
Metallographic examination: Assesses core microstructural parameters including carbide distribution, grain size, and purity.
Dimensional accuracy inspection: Guarantees compliance with drawing tolerance requirements.
Traceability: Comprehensive production batch records and quality reports ensure full process traceability, providing peace of mind.
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.
