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UNS S31703 (317L stainless steel) is a versatile austenitic stainless steel that is favored for its excellent corrosion resistance and a wide range of applications. It is suitable for use in a variety of industrial environments, including extreme temperatures and corrosive media. Due to its high molybdenum content, 317L stainless steel performs well in chloride and brine environments, making it ideal for many applications requiring high corrosion resistance.
UNS S31703, commonly referred to as 317L stainless steel, is an austenitic stainless steel that contains the element molybdenum. This material has better corrosion resistance compared to grades 304/304L and 316/316L. 317L stainless steel has better resistance to chlorine ion pitting than 316L due to the increased content of chromium, nickel and molybdenum. It usually meets the mechanical properties of 317 stainless steel while maintaining a low carbon content and is achieved by controlling the addition of nitrogen.
The typical chemical composition of 317L stainless steel is as follows:
Carbon (C): Maximum 0.03%
Manganese (Mn): Maximum 2.00%
Silicon (Si): 1.00% Max
Chromium (Cr): 18.0-20.0%
Nickel (Ni): 11.0-15.0%
Molybdenum (Mo): 2.0-3.0%
Phosphorus (P): maximum 0.045%
Sulfur (S): Maximum 0.030%
Nitrogen (N): 0.10% Max
The physical properties of 317L stainless steel include:
Density: about 7.98 g/cm³
Melting point range: about 1390-1450 °C (about 2526-2642 °F)
Coefficient of thermal expansion: varies with temperature, but at about 16 x 10⁻⁶ K⁻¹
The mechanical properties of 317L stainless steel are usually as follows:
Tensile strength: approximately 515 MPa (75,000 psi)
Yield strength: approximately 205 MPa (30,000 psi)
Elongation: about 40% Hardness: about 187 HB
317L stainless steel exhibits excellent corrosion resistance in a variety of media, especially in chloride and brine environments. It has better resistance to pitting and crevice corrosion than 316L stainless steel.
317L stainless steel is widely used in the following industries and applications:
Flue gas desulfurization (FGD) system
Chemical processing
Oil and gas
Pulp and paper making
Condensers for the power industry
317L stainless steel has good cold and hot working properties and is easy to weld and form. It can be machined by various metalworking techniques, including bending, drawing and deep drawing.
