SUS420J2 Martensitic Stainless Steel- SCALE STEEL.

When proceeding with heat treatment (quenching and tempering), SUS420J2 has excellent corrosion resistance, polishing performance, high strength and wear resistance, suitable for manufacturing plastic mold bearing high load, high [SCALE STEEL]wear resistance and under the action of corrosive media.  
 
Standard of SUS420J2 Stainless Steel: JIS G 4303:2005  
 
SUS420J2 stainless steel is martensitic type stainless steel, this kind of stainless has good machining performance, the hardness of 3Cr13 material below HRC30 after quenching and tempering treatment is better machinability, [SCALE STEEL]easy to achieve better surface quality.  While hardness is greater than HRC30 processed parts, although the surface quality is better, but the tool is easy to wear.  Therefore, in the material into the factory, the first quenching and tempering treatment hardness reached HRC25 ~ 30, and then the cutting process.  SUS420J2 has high hardness after quenching, used as cutting tools, nozzle, seat, valve, etc.  
 
The density of SUS420J2 is 7.75g/cm3.  
 
Chemical composition  
C 0.26-0.40Mn ≤ 1.00Si ≤1.00,P≤ 0.040s ≤ 0.030Cr 12.00-14.00Ni ≤0.60  [SCALE STEEL]
 
Mechanical Properties of SUS420J2:  
Yield strength (N/mm2) ≥540  
Tensile strength (N/mm2) ≥740  
Elongation EL (%) ≥12  
HRC hardness 50 to 55  
Hardness acuity HBW217  
Area shrinkage rate /% ≥40  
Charpy impact value/(J/cm2) ≥29[3]  
Heat treatment / ℃  
Quenching [SCALE STEEL]temperature 1000~1050℃  
Tempering temperature 200~500℃  
 
SUS420J2’s Properties: 
Rust resistance, corrosion resistance, avoid heat treatment, will not produce heat treatment caused by the deformation, ultra mirror [SCALE STEEL]processing performance, in the state of annealing has good mechanical processing performance.  
 
Application:
SUS420J2 Stainless is widely used in fluorinated plastics with corrosive gases or corroded plastic moulds with[SCALE STEEL] added flame retardants, etc.