DIN 1.4401 Stainless Steel Round Pipes

1.4401 is a stainless steel material defined in the German standard DIN EN 10088, also known as X5CrNiMo17-12-2.
1.4401 stainless steel round tubes are widely used in many fields, including chemical industry, petroleum, food processing, pharmaceuticals, shipbuilding and offshore engineering, medical equipment and biotechnology. 1.4401 stainless steel pipe is commonly used to make containers, pipes, valves, pumps and chemical processing equipment.
The chemical composition of DIN 1.4401 seamless pipe contains 17% to 19% chromium and 8% to 10% nickel, as well as small amounts of molybdenum, manganese and other elements. The existence of these elements makes DIN 1.4401 stainless steel polished pipe have good corrosion resistance and can be used in harsh environments for a long time without corrosion, oxidation and other problems. DIN 1.4401 electropolished pipe provides excellent corrosion resistance in many corrosive media, including acidic and alkaline environments. It is highly corrosive to many chemicals, chlorine salts and seawater.

DIN 1.4401 Pipes Seamless Pipes Equivalent Grades

Grade		316
UNS No		S31600
Old British	BS	316S31 / 316S33
	En	X5CrNiMo17-12-2 / X3CrNiMo17-13-3
Euronorm	No	1.4401 / 1.4436
	AFNOR	Z7CND17-11-02
Swedish SS		–
Japanese JIS		SUS 316
GOST		–

SS DIN 1.4401 Tubes Physical Properties

Grade		DIN 1.4401
Density (kg/m3)		7750
Elastic Modulus (GPa)		200
Mean Coefficient of Thermal Expansion (m/m/0C)	0-1000C	15.9
	0-3150C	16.2
	0-5380C	17.0
Thermal Conductivity (W/m.K)	at 1000C	14.2
	at 5000C	18.7
Specific Heat 0-1000C (J/kg.K)		500
Electrical Resistivity (n.m)		720

DIN 1.4401 Cold Rolled Pipes

1.4401 heat treatment method:
1. Solution treatment: Solution treatment is to eliminate intergranular precipitation and hardening phases in stainless steel by heating to high temperatures, usually between 1050°C and 1150°C, and then rapidly cooling, and rebuilding a uniform austenite crystal structure .
2. Cooling treatment: Cooling treatment is to rapidly cool the stainless steel material after solid solution treatment, usually through water or oil medium, to increase the hardness and strength of the material. However, the cooled material may produce high internal stresses that require subsequent tempering to eliminate these stresses.
3. Tempering treatment: Tempering treatment is performed by heating to an appropriate temperature, usually between 300°C and 800°C, and then cooling appropriately to reduce the internal stress generated during the cooling treatment and adjust the hardness of the material. and resilience.

 

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