X2CrNiMo18-15-4、1.4438、X2CrNiMo1816、X2CrNiMo18 16

Characteristics and scope of application:
1.4438 is austenitic stainless steel based on molybdenum. Compared with conventional chromium-nickel austenitic stainless steel such as 1.4301, it has stronger chemical resistance. In addition, compared with conventional stainless steel, 1.4438 has higher ductility, stress corrosion resistance, compressive strength and high temperature resistance. It is a low carbon grade or L grade. This grade has anti-sensitization properties during welding and heat treatment.
Compared with 1.4404, 1.4438 steel has good seawater resistance and SCC resistance, and is used in chemical equipment that requires high corrosion resistance, such as Chemical ships and Chemical products.

chemical composition:

Grade	C≤	Si≤	Mn≤	S≤	P≤	Cr	Ni	Mo
1.4438	0.03	1.00	2.00	0.030	0.045	18.00 20.00	11.00 15.00	3.00 4.00

 

Mechanical properties:

Tensile strength σb (MPa): ≥481

Conditional yield strength σ0.2 (MPa): ≥176

Elongation δ5 (%): ≥40

Section shrinkage ψ (%): ≥60

Hardness: ≤187HB; ≤90HRB; ≤200HV

 

Heat treatment specifications and metallographic structure:

Heat treatment specifications:

Solution: 1010 ～ 1150 ℃, fast cooling.

Microstructure:

The organization is characterized by austenite type.