D2 / 1.2379 / Cr12Mo1V1 — Tool Steel Grade Specification, Properties & Equivalents

D2 / 1.2379 / Cr12Mo1V1 is a workhorse cold-work tool steel widely recognised in India for its exceptional wear resistance and good toughness. Formulated with significant chromium and molybdenum content, D2 / 1.2379 / Cr12Mo1V1 steel offers a superior balance of hardenability, dimensional stability during heat treatment, and red-hardness compared to lower-alloyed steels. Indian manufacturers and end-users in automotive, die-making, and general engineering sectors rely heavily on D2 / 1.2379 / Cr12Mo1V1 for critical applications such as blanking dies, forming dies, slitting cutters, and coining dies. Its reliable performance ensures longer tool life and reduced downtime, making D2 / 1.2379 / Cr12Mo1V1 a preferred choice for demanding operations. The availability of D2 / 1.2379 / Cr12Mo1V1 from major Indian steel producers and specialised stockists further cements its importance in the domestic market.

Chemical Composition of D2 / 1.2379 / Cr12Mo1V1

Mechanical Properties of D2 / 1.2379 / Cr12Mo1V1

Available Forms in India

Real-world Applications

• Die Making: Blanking, piercing, and forming dies for sheet metal processing.
• Stamping: High-wear stamping dies in the automotive and appliance industries.
• Slitting Cutters: Serrated knives for slitting paper, plastic, and thin metal.
• Coining Dies: Used for minting coins and producing precision components requiring high detail.
• Thread Rolling Dies: Creating threads on fasteners and other components.
• Woodworking Tools: Knives and cutters requiring high edge retention.
• Shear Blades: Heavy-duty shear blades for cutting metal sheets.
• Gauges and Measuring Tools: Fixtures requiring dimensional stability and wear resistance.

Machining and Welding D2 / 1.2379 / Cr12Mo1V1

Machining D2 / 1.2379 / Cr12Mo1V1 requires careful consideration due to its high hardness and alloy content. Generally, it is best machined in the annealed condition (approx. 250 HB max) before hardening. When machining hardened D2 steel, use heavy-duty, rigid machine tools with slow speeds and high feed rates. Carbide tooling or ceramic inserts are recommended, with copious amounts of coolant to manage heat. Grinding is often the preferred method for achieving precise dimensions and surface finishes on hardened D2 / 1.2379 / Cr12Mo1V1 components post-heat treatment.

Welding D2 / 1.2379 / Cr12Mo1V1 is possible but challenging, typically reserved for repair or specific joining applications. Preheating to 250-300°C and maintaining interpass temperatures around this range is crucial to minimize cracking. Gas Tungsten Arc Welding (GTAW) or Shielded Metal Arc Welding (SMAW) with appropriate filler materials (e.g., high-alloy tool steel rods) is common. Post-weld heat treatment, including a stress-relieving cycle or a full temper at a lower temperature than the original hardening temper (e.g., 500-550°C), is often necessary to reduce residual stresses in the weldments of D2 / 1.2379 / Cr12Mo1V1.

Heat Treatment and Processing D2 / 1.2379 / Cr12Mo1V1

The heat treatment of D2 / 1.2379 / Cr12Mo1V1 tool steel is critical to achieving its characteristic hardness and wear resistance. Annealing is performed after hot working or before machining, typically at 800-840°C followed by slow cooling to a maximum hardness of 250 HB (approx. 220 HB is preferred). For hardening, D2 / 1.2379 / Cr12Mo1V1 is heated to 1000-1050°C and quenched in oil or a salt bath. Air cooling from this temperature is also an option for thinner sections. The high chromium content can lead to decarburization, so protective atmospheres or careful control of heating is advised.

Tempering is essential to relieve stresses and impart toughness, typically done at 200-550°C, depending on the desired final hardness. A double temper is recommended. Hardness levels between 58-60 HRC are achieved with tempering around 200°C, while tempering at higher temperatures, such as 500-540°C, results in around 54-56 HRC, offering improved toughness but lower hardness. Normalizing is not a typical practice for D2 / 1.2379 / Cr12Mo1V1, as it is usually hardened from high temperatures. The optimal processing ensures the high-performance characteristics that define D2 / 1.2379 / Cr12Mo1V1.

Sourcing D2 / 1.2379 / Cr12Mo1V1 in India

D2 / 1.2379 / Cr12Mo1V1 tool steel is readily available across major industrial hubs in India, including Mumbai, Pune, and Chennai. Leading Indian steel manufacturers like SAIL (Steel Authority of India Limited), JSW Steel, and Jindal Stainless, along with numerous specialized tool steel importers and stockists, ensure consistent supply. Minimum Order Quantities (MOQ) typically range from 500 kg to 2,000 kg for standard bar sizes, though smaller quantities can often be sourced from extensive stock holdings. The indicative price band for D2 / 1.2379 / Cr12Mo1V1 in India typically falls between INR 180/kg to INR 350/kg, varying with size, form, and specific mill source. Buyers should expect to receive Mill Test Certificates (MTC) as per EN 10204 3.1, detailing the chemistry and mechanical properties of the supplied D2 / 1.2379 / Cr12Mo1V1 batch.

International Equivalents for D2 / 1.2379 / Cr12Mo1V1

FAQs about D2 / 1.2379 / Cr12Mo1V1