What is X5CrNiMo17-12-2 material equivalent to?

What is X5CrNiMo17-12-2 material?

X5CrNiMo17-12-2 (material number 1.4401) is a standard molybdenum-alloyed austenitic stainless steel, commonly known as AISI 316. It offers superior corrosion resistance compared to 304/1.4301, particularly in chloride-containing, marine, and chemical environments. It is characterized by high ductility, weldability, and heat resistance up to 550°C.

 

What is X5CrNiMo17-12-2 material equivalent to?

X5CrNiMo17-12-2 (material number 1.4401) is primarily equivalent to AISI 316 stainless steel, a standard austenitic molybdenum-alloyed grade. It is frequently utilized for its excellent corrosion resistance, particularly in marine, chemical, and pharmaceutical environments, and is often interchanged with AISI 316L (1.4404) for lower-carbon requirements.

 

DIN EN 1.4401 Chemical Composition

Chemical Composition, %
Steel Grade (Steel Number)	Standard	C, max	Si, max	Mn, max	P, max	S, max	Cr	Ni	Mo	N, max
X5CrNiMo17-12-2 (1.4401)	EN 10088-2; EN 10088-3	0,07	1,00	2,00	0,045	0,030	16,5-18,5	10,0-13,0	2,00-2,50	0,10

 

DIN 1.4401 Physical Properties

Density, g/cm3	8,0
Magnetic	No
Electrical resistivity, μΩ·m	0,75 (20 ℃)
Specific heat capacity, J/(kg·K)	500 (20 ℃)
Thermal conductivity, (W/m·K)	15,0 (20 ℃)
Modulus of elasticity, Gpa	200 (20 ℃)
	194 (100 ℃)
	186 (200 ℃)
	179 (300 ℃)
	172 (400 ℃)
	165 (500 ℃)
Mean coefficient of thermal expansion, (10-6/K)	16,0 (20-100 ℃)
	16,5 (20-200 ℃)
	17,0 (20-300 ℃)
	17,5 (20-400 ℃)
	18,0 (20-500 ℃)

 

1.4401 Stainless Steel Mechanical Properties

at room temperature in the solution-annealed condition and resistance to intergranular corrosion.

Mechanical properties (Solution annealed)
Country (Region)	Standard	Steel Grade (Steel Number)	Diameter (d) or Thickness (t) in mm	Hardness (HB), ≤	0.2% yield strength (MPa), ≥	1% yield strength (MPa), ≥	Tensile strength (MPa)	Elongation, % (long.)	Elongation, % (tr.)	Impact energy, KV2, J (long.), ≥	Impact energy, KV2, J (tr.), ≥
European Union	EN 10088-3	X5CrNiMo17-12-2 (1.4401)	≤160	215	200	235	500-700	40	–	100	–
			160<t≤250	215	200	235	500-700	–	30	–	60

 

1.4401 Heat Treatment

For solution annealing of 1.4401, if the heat treatment is performed in a continuous furnace, it's usually preferable to specify an upper limit of the temperature range or even exceed it, and cooling should be sufficiently rapidly to avoid precipitation.

		Hot forming		Solution annealing
Standard	Designation (Steel number)	Temperature, ℃	Type of cooling	Temperature, ℃	Type of cooling
DIN EN 10088-2	X5CrNiMo17-12-2 (1.4401)	1150 to 850	air	1030 to 1110	water, air
DIN EN 10088-3		1200 to 900		1020 to 1120

 

Welding

DIN EN 1.4401 material has good weldability, with or without filler metal. If filler metal is needed, 1.4430 can be used, and the maximum interpass temperature is 150 °C. Due to the high carbon content, it is possible to form chromium carbide, thereby reducing resistance to intergranular corrosion, and post-weld heat treatment may be required. If larger areas must be welded, 1.4404 (X2CrNiMo17-12-2) is recommended.

 

Machinability

Since 1.4401 stainless steel has a higher carbon content than 1.4404, machinability is reduced.

 

Corrosion Resistance

PREN = 23.1 – 28.5, since the steel contains 2-2.5% molybdenum, the resistance to pitting and chloride corrosion is improved, and the corrosion resistance of 1.4401 is significantly better than that of stainless steel 1.4301 and 1.4307.

 

Use & Application

Chemical and pulp industry, paint, petroleum, soap and textile industry, dairy products, brewery parts and instruments.