24 July 2021 Hardware Tool Steel Sheet
5CrW2Si Hardware Tool Steel Sheet
5CrW2Si steel is an alloy tool steel formed by adding a certain amount of tungsten on the basis of chromium-silicon steel. The addition of tungsten helps to preserve finer grains during quenching, so that higher toughness can be obtained in the tempered state. 5CrW2Si tool steel also has certain hardenability and high temperature mechanical properties.
The characteristics are the same as 4CrW2Si , but the hardness is slightly higher at 650℃, reaching about 41~43HRC, and it is not sensitive to decarburization, deformation and cracking during heat treatment. The steel has good forgeability and is easy to anneal and soften, but it is unfavorable to the surface roughness.
After the tool steel cold shear die is quenched at 950°C and tempered at 250°C, the structure of lath martensite plus a small amount of uniformly refined carbides and fine residual austenite distributed at the boundary of the lath horse body is obtained. , It can significantly improve the strength and toughness of the cutting edge of the cold shear die, and increase the service life by 1.5-5 times. It is used for air chisel, empty hammer, rivet, and cold die. When used as hot steel, it can be used in punching, piercing tools, shearing dies, hot forging dies and easy-to-fuse die-casting dies.
The tool steel forging blank is usually annealed slowly after forging to fully soften it, but it is not good for the surface roughness of subsequent processing. The quenching temperature is 950℃, and the hardenability and hardenability of steel are the best. Therefore, the mold has the best wear resistance and compression resistance. The steel is directly heated and quenched after carburizing at 920°C, the surface hardness and thermal stability of the parts will be significantly improved, the bearing capacity at the edges and corners can be increased by 1 to 2 times, and the high strength level of бbb>4000MPa can be maintained.
By increasing the austenitizing temperature, the austenite grains are more uniformly refined, the carbon content tends to decrease, and the Ms point increases, so as to obtain more low-carbon martensite structure, improve the strength and toughness of the mold, and is beneficial to lengthening The service life of cold work molds.
Corresponding to other standard grades:
| China GB | American ASTM/UNS | International ISO | German DIN | French NF | Russian ГOCT | Swedish SS | British BS |
| 4CrW2Si | S1/T41901 | 45WCrV2 | 45WCrV7(DIN 1.2542) | 45WCrV8 | 5XB2C | 2710 | BS |
Chemical Composition:
| C | Si | Mn | S | P | Cr | Ni | Cu | W |
| 0.45-0.55 | 0.50-0.80 | ≤0.40 | ≤0.030 | ≤0.030 | 1.00-1.30 | allowable residual content ≤0.25 | allowable residual content ≤0.30 | 2.00-2.50 |
Physical Properties:
| Proof strength Rp0.2(MPa) | Tensile strength Rm(MPa) | Impact energy KV(J) | Elongation at fracture A(%) | Reduction in cross section on fracture Z(%) | As-Heat-Treated Condition | Brinell hardness(HBW) |
|---|---|---|---|---|---|---|
| 628(≥) | 525(≥) | 21 | 14 | 13 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 313 |
- The critical point temperature of steel (approximate value) Ac1=755℃, Ac3=860℃, Ms=295℃.
- The temperature is 100~250℃/250~350℃/350~600℃/600~700℃, the linear (expansion) coefficient of steel is 13.15×10-6℃-1℃/13.6×10-6℃-1/13.8 ×10-6°C-1/14.2×10-6°C-1.
Hardness:
Annealing, 255～207HB, indentation diameter 3.8～4.2mm; quenching, ≥55HRC
Hot Working Specification
- Steel ingot: heating temperature 1180~1200℃, initial forging temperature 1150~1170℃, final forging temperature ≥850℃, slow cooling.
- Billet: heating temperature 1150~1180℃, initial forging temperature 1120~1150℃, final forging temperature ≥850℃, slow cooling.
Normal annealing specification
Temperature 800~820℃ Critical point temperature (approximate value) Ac1=755℃, holding time 3~4h, and then slowly cooling to temperature ≤600~650℃ at a cooling rate of ≤30℃/h, and then air cooling out of the furnace. Heat treatment specification: sample quenching 860～900℃, oil cooling.
The high temperature tempering specification temperature is 710~740℃, after soaking, the holding time is 3~4h, and then the furnace is cooled or the furnace is air cooled.
The standard temperature of isothermal annealing is 750~760℃, holding for 8~10h, and then slowly cooling to temperature ≤650℃ at a cooling rate of 10~20℃/h, and then air cooling out of the furnace. The hardness is 207~235HBS, and better processing performance can be obtained.
Application:
- Manufacturing blades for cutting metal, shovel blades for shoveling and rubbing wire boards, die for cold blanking and edge trimming, etc.
- Manufacturing large and medium-sized heavy-duty round shear blades, long shear blades, and shaped shear blades.
- Manufacturing punch punches for medium and thick steel plates, precision pressing dies, cold heading dies, etc.
- Making manual and pneumatic chisels, air hammer tools, rivet tools, and cold punching dies.
- When used as hot processing steel, it can be used for punching, piercing tools, shearing dies, hot forging dies, and die-casting dies of fusible alloys.
- Manufacture of metal cutting blades and shovel blades for shoveling and rubbing wire plates.
- Die for cold blanking and trimming.