What is CrWMn steel? What are the characteristics of CrWMn steel?

Cold work die steel, performance and uses are close to SK3.

China GB/YB standard grade CrWMn, China Taiwan CNS standard grade SKs31, Japanese JIS standard grade SKS31, Korean KS standard grade sTS31, International Organization for Standardization (Is0) standard grade 105wCr1, German DIN standard grade 105WCr6, German D1N standard material number 1.2419 , French NF standard grade 2212/9UMCW5, Russian r0CT standard grade 9xFr. Supply varieties: hot-rolled materials, forged materials, cold-drawn materials, cold-drawn steel wires, silver-bright steel wires, hot-rolled steel plates and cold-rolled steel plates. Defired state, hardness 207-255HBW.

●Chemical composition: Carbon C: 0.85～0.95 Silicon Si: ≤0.40 Manganese Mn: 0.90～1.20 Sulfur S: ≤0.030 Phosphorus P: ≤0.030 Chromium Cr: 0.50～0.80 Nickel Ni: Allowable residual content ≤0.25 Copper Cu: Allowed residual content Content ≤0.30 Tungsten W: 0.70～1.2●Mechanical properties: Hardness: annealed, 241～197HB, indentation diameter 3.9～4.3mm; quenched, ≥62HRC

●Heat treatment specifications and metallographic structure: Heat treatment specifications: quenching, 800~830℃ oil cooling.

●Delivery status: The steel is delivered in an annealed state. Forging: Oil quenched die steel has some crack sensitivity. It is not advisable to heat quickly during forging heating. It is best to preheat at 650-750 degrees. The forging heating temperature is 1130-1150 degrees. The final metal forging temperature should be greater than 800-850 degrees. temperature, the upper limit temperature is taken when forging steel ingots. When forging the billet, lower the temperature limit for annealing: generally annealing uses 780-810 degrees, holding for 4-6 hours, cooling to 550 degrees at ≤50 degrees/hour, air cooling, and isothermal annealing using 700-800 degrees holding for 2-4 hours, and then Then keep it at 670-720 degrees for 2-4 hours, then cool to 500 degrees at a cooling rate of ≤50 degrees/hour and air-cooled. The critical temperature of the annealed hardness of 241-197HBCrWMn steel is shown in the table below. Critical temperature of CrWMn steel 1) This steel is widely used in processing thin steel plates. It is the basic material for light-load and complex-shaped cold punching dies of non-ferrous metals, especially in the fields of watches, instruments, toys, industry and other fields. Hedge austenitic steel plates, silicon steel , the effect of high-strength steel plate is not ideal.

2) This steel can be used to make complex-shaped punches, concave dies, and inserts for punching dies with material thickness <1mm, as well as convex and concave dies for strand drawing dies. The recommended hardness is 58 ~ 62HRC when making punches, and when making concave dies. Recommended hardness is 60 ~64HRC.

3) Used for punches, concave dies, and inserts in bending dies that require high wear resistance and complex shapes. The recommended hardness is 58 ~ 62HRC when making punches, and the recommended hardness is 60 – 64HRC when making concave molds.

4) For the punch and concave mold of cold extrusion molds for cnc aluminum parts, the recommended hardness is 60-62HRC when making the punch, and the recommended hardness is 62~64HRC when making the concave mold.

5) Used for cold extrusion molds of copper parts and cold extrusion punches and concave molds of steel parts. The recommended hardness is 62~64HRC.

6) After forging, it can be used to make plastic mold sets for use on plate presses above 1mm. The hardness of the steel is usually raised to 50 – 55HRC. However, obvious banded carbide structures or liquids should be reduced or avoided. Analysis and other organizational defects.