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4Cr13 stainless steel beads physical properties

Update:30-09-2019
Summary:

●Mechanical properties: Steel ball hardness: Annealing, […]

●Mechanical properties:
Steel ball hardness: Annealing, ≤201HB; quenching and tempering, ≥50HV, HRC up to 55
● Heat treatment specifications and metallographic organization:
420C stainless steel ball heat treatment method: 1) annealing, 800 ~ 900 ° C slow cooling or about 750 ° C rapid cooling; 2) quenching, 1050 ~ 1100 ° C oil cooling; 3) tempering, 200 ~ 300 ° C rapid cooling.
Metallographic organization: The tissue is characterized by martensite type.
● Delivery status: Generally delivered in heat treatment state, the type of heat treatment is indicated in the contract; if not specified, it is delivered in the state of no heat treatment.
● Annealing
General annealing is 780-800 degrees, heat preservation 4-6 hours, ≤50 degrees / hour, cooling to 550 degrees, air cooling, isothermal annealing using 700-800 degrees insulation 2-4 sales, then 670-720 degrees insulation, keep 2-4 hours, cooled to ≤50 degrees / hour cooling rate to 500 degrees, air cooling, annealing hardness of 241-197HB

What is the difference between 3Cr13 and 4Cr13 stainless steel balls?

3Cr13 steel ball has high hardness and is used as cutting tool, nozzle, valve seat and valve.
4Cr13 steel ball is mainly used as a hot oil pump, valve plate, valve bearing, medical equipment, spring and other parts with higher hardness and high wear resistance.

2cr13 ball 3cr13 stainless steel ball and 4Cr13 stainless steel bead which is more suitable for customers?
  4Cr13 is harder than 3Cr13 and 2C r13 but the toughness is almost the same. The former 2, 3, 4 indicates the carbon content. The higher the carbon content, the harder the toughness is. Of course, the higher the hardness, the better the wear resistance. Generally, European customers prefer to order 420C steel balls. In the United States and South Korea, Japan prefers to order 420 steel balls, especially 3C13, which is the Japanese standard SUS420J2 steel ball.