D2 Cold Work Mold Steel

One. Product Description

D2 is a kind of mold steel, the hardness can reach 60HRC after heat treatment, it is a kind of semi-stainless steel. D2 steel has good wear resistance and moderate toughness. The disadvantage is that the corrosion resistance is slightly insufficient. It is a more suitable steel for practical use.

Two. Quality Standard

ASTM A681 Standard Specification for Tool Steel Alloys

Three. Product Specifications

Four. Equivalent Grade of D2 Mold Steel - For Reference Only

Five. Product Features and Uses

Features:

D2 is an air-hardened tool steel. The mass fraction of carbon in this steel is as high as 1.5%, and the mass fraction of chromium is as high as 11.5%. After heat treatment, the hardness can reach 60HRC, but its ductility, toughness and rust resistance are relatively weak, and the surface of the steel is difficult to mirror-polish. With the development of cold stamping products in the direction of high precision, high efficiency and multi-variety, mold steel is required to have better wear resistance and toughness.

Use:

It is suitable for tool steel with complex and possible deformation, various cold stamping molds with high wear resistance and long life, cold scissor blades, thread rolling plates; cold extrusion forming, deep drawing molds, stainless steel sheets and blanking molds for high hardness materials Wait.

Six. Product Detailed Information

D2 mold steel is a high wear-resistant micro-deformation cold work mold steel with a carbon content of up to 1.6% and a chromium content of 12%. After professional heat treatment, the hardness can reach above 60HRC. D2 mold steel can be used to make cross sections. Large and complex shapes. Cold working molds that withstand high impact and require high wear resistance, such as silicon steel sheet molds, cold shears, edge trimming molds, metal stamping molds, wire drawing molds, stainless steel sheet molds, high hardness molds, and wire rolling molds. Hardware has high wear resistance , hardenability, micro-deformation, high stability, high bending strength and other characteristics, second only to high-speed steel, is the preferred steel for stamping molds and cold heading molds.

D2 mold steel has the following characteristics:

1. Good processability and excellent dimensional stability after heat treatment.

2. Excellent processing performance.

3. Excellent dimensional stability after hardening.

4. After quenching and tempering, the surface hardness is high and the body toughness is well matched.

D2 steel is widely required in the world due to its high carbon, high chromium, ledeburite steel and other characteristics, and pays more attention to hardenability, hardenability and high wear resistance, so D2 steel has better high temperature oxidation resistance and heat treatment. deformability. Smaller in size, it is very suitable for manufacturing various high-precision, long-life cold work molds, cutting tools and measuring tools, etc., and is currently pursued by many automotive cold stamping mold factories. The workpieces and molds produced with D2 mold steel have been indirectly distributed to well-known domestic and foreign auto companies such as Geely Auto Apocalypse, Jianghuai, Southeast, Honda, Ford, GM, BMW, Audi, and Porsche.

Processing:

Stress relief annealing:

After rough machining of the workpiece, heat it to 600~650°C, keep it for 2 hours, cool it down to 500°C with the furnace, and release it for air cooling.

Quenching:

The workpiece is slowly heated up to 600 °C, the first preheating and holding for 20 minutes, the temperature is uniform and then raised to 850 °C, the second preheating and holding for 30 minutes, and finally the temperature is raised to 1020~1040 °C, holding for 25~40min, out of the furnace Air-cooled.

Tempering:

After quenching, it should be tempered immediately, at least twice, and the holding time should not be less than 2 hours each time. Quenching, preheating at 820±15℃, heating at 1000+6℃ (salt bath) or 1010±6℃ (furnace controlled atmosphere), holding for 10~20min, air cooling, tempering at 200±6℃.

Notice:

After quenching, it should be tempered in time to prevent cracking and surface decarburization. Gauge and high-precision mold should be cryogenically treated at -70°C and tempered at high temperature to reduce workpiece deformation. The high temperature tempering temperature is 500~560℃, and the hardness is greater than 58HRC.

Hardness:

Annealing ≤255HB, indentation diameter ≥3.8mm, quenching>59HRC.

Company delivery condition is soft annealed to 255HB.

Similar material grades in other regions:

Japan SKD11 mold steel, Germany X165CrMoV12~1.2601.