20Cr4 strength alloy steel and high 15Cr steel hardenability, toughness is poor; welding is better, generally without heat treatment after welding. 20Cr4 Ministry of strength for the heart to withstand wear and surface higher, a larger size, or shape of the load much more complex and carburizing parts such as gears, gear shaft, cam, piston pin, worm, etc., can also be used large and medium speeds work under shock loading of quenched and tempered parts.
● Chemical Composition:
Carbon C: 0.18 ~ 0.24
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.50 ~ 0.80
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.70 ~ 1.00
Ni: to allow the residual content of ≤ 0.030
Copper Cu: to allow the residual content ≤ 0.030
