Materials Used For Hot Forging Dies

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1. Has been included in the national standard hot work die steel

The hot work die steel series has been included in the national standard “GB/T1299-2000 alloy tool steel”, and can be divided into W series, Cr-Mo series, Cr-W-Mo series and other types according to the main chemical composition.

3Cr2W8V (H21) steel has high thermal strength, high thermal stability, good wear resistance and process performance, and its working temperature reaches 650°C. Disadvantages: severe segregation of carbides, poor plasticity, toughness, thermal conductivity, thermal fatigue resistance and corrosion resistance. my country was introduced from the former Soviet Union in the 1950s. It has a short service life, high alloying degree and high cost. At present, it has been basically eliminated abroad. Due to the limitation of steel grade and technology, my country is still in mass production and use.

4Cr5MoSiV (H11) and 4Cr5MoSiV1 (H13) steels have high hardenability and hardenability, high toughness, high thermal strength and wear resistance, and the use of 590 steel has fine and uniform carbides, and has good resistance to cold and heat fatigue and corrosion resistance. , Good cold and hot processing performance. H13 steel (an improved version of H11 steel) is currently the main material of domestic hot forging steel and cold forging die sleeves, and it is also a highly versatile hot work die steel. It is an ideal steel to replace 3Cr2W8V steel, and its life can be increased by 2-3 times.

4Cr3Mo3SiV (H10) steel has high toughness, high resistance to high temperature softening and medium-level abrasion resistance. It can replace 3Cr2W8V steel to make hot extrusion die. The thermal stability of 4Cr5W2VSi steel is higher than that of H13 and H21 steel, and its toughness is between H13 and H21. Appropriate high-speed upsetting die, the service life is 0.5-1 times longer than H21 steel.

3Cr3Mo3W2V (HM1) steel has excellent strength and toughness, high thermal strength, wear resistance, tempering stability, cold and heat fatigue resistance, good cold and hot processing performance, and working temperature above 700 ℃. The steel has strong versatility and is suitable for making molds that work under high temperature, high speed, high load, and rapid heating. Its performance is better than 4Cr5W2VSi and 3Cr2W8V steel, and the mold life is 2-3 times longer than that of 3Cr2W8V steel.

5Cr4W5MoV (RM2) steel has a working temperature of 700℃, has high tempering resistance and thermal stability, high thermal strength, high temperature hardness and wear resistance, but its toughness and thermal fatigue resistance are lower than H13 steel . It is suitable for making hot work molds with high high temperature strength and wear resistance. It can replace 3Cr2W8V steel, and the life of the mold can be increased by 2-4 times. 5Cr4Mo3SiMnVAl (012AI) steel has a working temperature of 700°C or higher, and has high thermal strength, high temperature hardness, tempering stability, wear resistance and thermal fatigue resistance, good toughness and thermal processing plasticity, and good nitriding properties. It can replace 3Cr2W8V steel mold life and increase 3-5 times.

2. Part of the hot work die steel series has been included in the ministerial standard

4Cr40Mo2WSiV (YB/T210-1976) steel has high thermal stability, toughness, wear resistance and crack resistance, and its stability is better than 4Cr5W2VSi and 4Cr5MoSiV1 steel, and is similar to 3Cr2W8V steel.

3Cr2W8MoV (JB/T6399-1992) steel is an improved type of 3Cr2W8V steel. 3Cr3Mo3VNb (HB5137-1980) steel is a kind of ultra-high strength and toughness hot work die steel. When it is higher than 600℃, it has higher high temperature toughness, thermal stability, thermal resistance and wear resistance than 4Cr5MoSiV1, 4Cr5W2VSi, 3Cr2W8V steel And thermal fatigue resistance, good cold and hot processing performance.

3. Part of the trial hot work die steel series are not included in the standard

The 3Cr3Mo3V steel has moderate thermal stability, hardness, heat fatigue resistance and toughness.

5Cr4Mo3W2V steel is used as a hot press forging die.

The highest temperature of 4Cr3Mo2V steel reaches 700℃, which is suitable for hot extrusion die.

The 4Cr3MoSiV steel has a working temperature of 700°C, and the code is CH75.

For 3Cr3Mo3W2VRE steel, 0.06% RE is added to 3Cr3Mo3W2V steel to refine grains and significantly improve plasticity, toughness and life. The thermal strength of 4Cr5MoWVSi steel is better than H13 steel, and it has good toughness and thermal fatigue resistance, code H12, suitable for hot extrusion die and upsetting die.

4Cr3Mo2NiVNb (code HD) steel, all kinds of hot work molds; 4Cr3Mo2NiVNbB (code HDB) steel, improved fracture toughness and thermal fatigue resistance. The working temperature is above 700℃, and the service life is 2-2.5 times higher than that of 3Cr2W8V steel. 5Cr4W3Mo2VSi and 5Cr4W3Mo2VNb steel, codenamed 50Si, 50Nb, base steel. Suitable for hot extrusion die. 4Cr5Mo2SiMnV1 (code Y10) and 4Cr3Mo3W4VTiNb (code GR) steel, a new type of hot work die steel, the service life is 2-6 times higher than that of 3Cr2W8V steel, suitable for high manufacturing temperature, long contact time with the workpiece, easy to cause thermal deformation or collapse or Molds that have failed due to thermal wear.

6W8Cr4VTi (code LM1) and 6Cr5Mo3W2VSiTi (code LM2) steels have good thermal strength, high isothermal strength, high temperature hardness, tempering stability and good wear resistance. Both cold and hot molds use steel, and the mold life is several times longer than that of 3Cr2W8V steel. 4Cr3Mo2MnVB (code ER8) and 4Cr3Mo2MnVNbB (code Y4) steel, die life is 2-4 times that of 3Cr2W8V steel, hot extrusion die steel.

Editing by Baccata

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