1.4401, DIN X5CrNiMo17122, AISI 316

 1.4401, DIN X5CrNiMo17122, AISI 316

Designation by Standards

 

Chemical Composition (in weight %)

Description
This austenitic stainless steel has an increased molybdenum content to increase its resistance to corrosion when compared to other 300 series alloys. It will resist scaling at temperatures up to 871^oC and maintains good mechanical properties and ductility.

Applications
Widely used in industry, it was initially designed for paper mill machinery. It has been used in marine environments and a wide variety of general industrial components. Component parts for the cellulose, paper, oil, soap and textile industry, production of paints, meat processing industry, breweries, dairies and for surgical instruments.

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10³ x N/mm²]: 200, 186 (200^oC), 172(400^oC)
Density [g/cm³]: 7.98
Thermal conductivity [W/m.K]: 15.0
Electric resistivity [Ohm mm²/m]: 0.75
Specific heat capacity[J/g.K]: 0.50

Coefficient of Linear Thermal Expansion 10^{-6 o}C^-1

Hardening
Harden from a temperature of 1020-1100^oC followed by water or oil quenching. Structure is austenite with small ferrite component.

Mechanical properties in solution-annealed condition and reistance to intercrystalline corrosion
0.2 % proof stress: 200 N/mm² (for d<=160, 160<d<=250)
1.0 % proof stress: 235 N/mm² (for d<=160, 160<d<=250)
Tensile strength: 500-700 N/mm²
Elongation: 40% (for d<=160, longit.), 30% (for 160<d<=250, transv.)
Notch impact energy (ISO-V): 100 J (for d<=160, longit.), 60 J (for 160<d<=250, transv.) Resistance to interystalline corrosion: yes (in as delivered condition), no (in sensitised condition)
Note: Sensitisation treatment for 15 min at 700^oC with subsequent cooling in air.

Mechanical Properties At Elevated Temperatures

Forging
Hot forming temperature: 1200-900^oC.

Machinability
Low speeds and constant feeds will minimize this alloy's tendency to work harden. Tougher than 304 stainless with a long stringy chip, the use of chip breakers is recommended.

Corrosion Resistance
Resistant to a wide variety of marine environments, salts, dilute nitric, acetic and sulfuric acids.

Welding
All common fusion and resistance methods except oxyacetylene welding have proven successful. Use AWS E/ER316 or 316L filler metal for best results.

Cold working
Shearing, stamping, heading and drawing can be successfully performed . To remove internal stresses, a post-work annealing is recommended.