SUS420J1、420S37、Z20C13、F.3402-X20Cr13

characteristic

420J1 martensitic stainless steel, welding should be preheated. Austenitic stainless steel electrodes for Q235 welding do not require preheating, such as A302.A307.

Control the dilution rate of the weld during welding, without swinging the welding, using a smaller current.

 

chemical composition

Steel number	C≤	Si≤	Mn≤	S≤	P≤	Cr	Ni≤
SUS420J1	0.16 0.25	1.00	1.00	0.030	0.040	12.00 14.00	0.60

 

Mechanical properties

Tensile strength σb (MPa): quenching and tempering, ≥638

Conditional yield strength σ0.2 (MPa): quenching and tempering, ≥442

Elongation δ5 (%): quenching and tempering, ≥20

Section shrinkage ψ (%): quenching and tempering, ≥50

Impact energy Aku2 (J): quenching and tempering, ≥78.4

Hardness: annealing, ≤223HB; quenching and tempering, ≤192HB

 

Heat treatment specifications and metallographic structure:

Heat treatment specifications: 1) annealing, slow cooling at 800 ～ 900 ℃ or rapid cooling at about 750 ℃; 2) quenching, 920 ～ 980 ℃ oil

Cold; 3) Tempering, fast cooling at 600 ～ 750 ℃.

Metallographic structure: the organization is characterized by martensite type.

 

Delivery status:

Generally, it is delivered in a heat-treated state, and the type of heat treatment is specified in the contract; if it is not specified, it is delivered in a non-heat-treated state.