317L Stainless Steel

317L stainless steel is a molybdenum bearing Austenitic chromium nickel steel, compared to 304L and 316L, low carbon 317L possesses more molybdenum, chromium and nickel element, that helps 317L provide better corrosion resistance characteristic, The low carbon content makes it suitable for welding without sensitization to intergranular corrosion caused by chromium carbide precipitation in the grain boundaries.

317L can be used for many applications, especially in sulfurous acid compounds environment, alloy 317L is non-magnetic in the annealed condition, but it may exhibit a little magnetism during welding or after welding.

317, 317L Stainless Steel Chemical Composition

CMnPSSiNiCrMoFe
3170.082.000.0400.0301.011-1418-203.0-4.0Balance
317L0.032.000.0400.0301.011-1518-203.0-4.0Balance

Through the controlled addition of nitrogen (0.1 max), it is common for 317L to meet the mechanical properties of 317.

317, 317L Stainless Steel Mechanical Properties

Tensile Strength(Mpa)Yield Point(Mpa)Elongation(%)HARDNESS
3175152053595
317L5152053595

317, 317L Stainless Steel Equivalent Grades

AISIUNSDINENJISGB
31731700SUS31706Cr19Ni13Mo3
317L317031.4438X2CrNiMo18-15-4SUS317L022Cr19Ni13Mo3

317L Stainless Steel Physical Properties

Density Melting Point Specific heat Thermal conductivity [W/(m·K)] Coefficient of Expansion( 10-6/K ) Electrical Resistivity Elastic modulus Magnetic
g/cm3 (℃) [J/(kg·K)] 0~100 ℃ 100 ℃ 500 ℃ 0~100 ℃ 0~500 ℃ ( NΩ.m kN/mm2
7.99 1371 – 1421 500 16.3 21.5 16.6 18.6 790 193 a little after cold worked

Corrosion Resistance

Low carbon with increased additions of chromium, nickel and molybdenum improve 317L stainless steel corrosion resistance, it can resist sulfurous, acetic, formic, citric, and tartaric acids attack, resistance to pitting, crevice corrosion and intergranular corrosion thanks to its composition with excellent properties。

Welding

317L stainless steel is suitable for all common fusion and resistance methods, with the exception of oxyacetylene welding, low carbon filler metals with molybdenum content higher than that of 317L, or a nickel-base filler metal with sufficient chromium and molybdenum content to exceed the corrosion resistance of 317L should be used to weld 317L steel.