Types, characteristics and applications of hot work die steel
In recent years, my country has done a lot of work in the research and development of new type die steels,
The localization research has provided the market with high-quality and cheap die steel. The following briefly introduces the types and application progress of hot work die steel
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”, which can be divided into main chemical components
W series, Cr-Mo series, Cr-W-Mo series and other types.
3Cr2W8V(H21) steel, with high thermal strength, high thermal stability, good wear resistance and process performance, working temperature
Reach 650°C. Disadvantages: severe segregation of carbides, better plasticity, toughness, thermal conductivity, resistance to cold and heat fatigue and corrosion resistance
difference. 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 basically
Eliminated. Due to the limitation of steel grade and technology, my country is still in mass production and use.
4Cr5MoSiV(H11) and 4Cr5MoSiV1(H13) steel have high hardenability and hardenability, high toughness, high thermal strength and wear resistance
Performance, the use temperature of 590 steel has fine and even carbide distribution, good cold and hot fatigue resistance and corrosion resistance, cold and hot processing performance
it is good. H13 steel (an improved version of H11 steel) is currently the main material for hot forging steel and cold forging die sleeves in China, and it is also a highly versatile hot
As 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 of wear resistance. Can replace
3Cr2W8V steel making 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, and resistance to cold and heat fatigue
Good working performance, hot and cold processing performance, working temperature above 700℃. The steel has strong versatility and is suitable for production at high temperature, high speed,
The performance of the mold working under high load, rapid cold and hot conditions is better than 4Cr5W2VSi and 3Cr2W8V steel, and the mold life is longer than
3Cr2W8V steel raises the standard by 2-3 times.
5Cr4W5MoV(RM2) steel has a working temperature of 700℃, which has high tempering resistance and thermal stability, and high thermal strength.
High temperature hardness and wear resistance, but its toughness and thermal fatigue resistance are lower than H13 steel. Suitable for production with high high temperature strength and
The anti-wear hot work die can replace 3Cr2W8V steel, and the die life can be increased by 2-4 times.
The 5Cr4Mo3SiMnVAl(012AI) steel has a working temperature of 700℃ or higher, and has high thermal strength, high temperature hardness, and anti-return
Fire stability, wear resistance and thermal fatigue resistance, toughness and thermal processing plasticity are good, and the nitriding performance is good. Can replace 3Cr2W8V steel mold
The life span can be increased by 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
Qualitatively better than 4Cr5W2VSi and 4Cr5MoSiV1 steel, it 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.
4Cr5MoSiV1, 4Cr5W2VSi, 3Cr2W8V steel has higher high temperature toughness, thermal stability, thermal strength, wear resistance and resistance
Thermal fatigue performance, good cold and hot processing performance. spring
3. Part of the trial hot work die steel series are not included in the standard
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 working temperature of 4Cr3MoSiV steel reaches 700℃, 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.
4Cr5MoWVSi steel has better thermal strength than H13 steel, with good toughness and thermal fatigue resistance, code H12, suitable for hot extrusion
Die, upsetting die. Tension spring
4Cr3Mo2NiVNb (code HD) steel, all kinds of hot work molds; 4Cr3Mo2NiVNbB (code HDB) steel, improved fracture
Crack 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, longer service life
3Cr2W8V steel is 2-6 times higher than the standard, suitable for high manufacturing temperature, long contact time with workpiece, easy to cause thermal deformation, collapse or thermal wear
Failed mold. Tension spring
6W8Cr4VTi (code LM1) and 6Cr5Mo3W2VSiTi (code LM2) steel, with good thermal strength, high isothermal
Strength, high temperature hardness, tempering stability and wear resistance are good. Both cold and hot molds use steel, and the mold life is several times longer than 3Cr2W8V steel.
4Cr3Mo2MnVB (code ER8) and 4Cr3Mo2MnVNbB (code Y4) steel, die life is 2-4 times that of 3Cr2W8V steel,
Hot extrusion die steel. Extension spring