Standard

JIS G4305 Cold Rolled Stainless Steel Strip and Sheet

 

420j2 stainless steel Chemical component

Grade	C	Si	Mn	P	S	Cr
SUS420J2	0.26-0.40	Max 1.00	Max 1.00	Max 0.040	Max 0.030	12.00-14.00

 

Mechanical Property Annealed

Steel Grade	0.2%Proof Stress N/mm2	Tensile Strength N/mm2	Elongation %	Hardness
				HRB	HV
SUS420J2	≥225	≥540	≥18	≤99	≤247

 

QT Heat-treatment

Cold-rolled steel Sheet thickness:1.5mm

Quenching condition: Air cooling after holding for 15 minutes at 1040℃

as-quenched hardness (HRC)=57

Holding time for tempering:2 hours

 

Machinability

Stainless steel grade 420J2 is machinable both in hardened and tempered conditions such as turning, drilling, and bending; however it is recommended that machining in hardened condition should be avoided as far as possible.

 

Welding

Welding of stainless steel grade 420J2 is easy. It is recommended that welding in annealed or hardened and tempered conditions should be avoided as it causes formation of brittleness, resulting in cold cracking due to contraction stresses.

 

Pre-heating and inter-pass temperature control during welding, followed by very slow cooling and post-weld annealing are good measures to take to prevent cracking.

 

Annealing

Annealing of this material can be performed by heating uniformly to 840-900°C (1544-1652°F) and held until the temperature is uniform throughout the section. Soaking and cooling is required.

 

Heat Treatment

Stainless steel grade 420J2 has to be heated uniformly to 730-790°C (1346-1454°F) and held until temperature is uniform throughout the section.

 

Hardening

Stainless steel grade 420J2 can be hardened by heating 950-1020°C (1742-1868°F) and held until temperature is uniform throughout the section. this should be followed by quenching in