Description

SS316 is an austenitic stainless steel grade specified by its chemical composition, which includes chromium, nickel, and molybdenum, and mechanical properties like tensile strength, yield strength, and hardness. Key specifications include a composition of approximately 16-18% chromium, 10-14% nickel, and 2-3% molybdenum, which provides superior corrosion resistance to chlorides compared to SS304. Standard mechanical properties, such as a minimum tensile strength of 515 MPa and a minimum 0.2% yield strength of 205 MPa for annealed plate, are defined by standards like ASTM A240. Chemical Composition (Typical Ranges): Chromium (Cr): 16.0 - 18.0% Nickel (Ni): 10.0 - 14.0% Molybdenum (Mo): 2.0 - 3.0% Carbon (C): ≤ 0.08% Manganese (Mn): ≤ 2.0% Silicon (Si): ≤ 0.75% Phosphorus (P): ≤ 0.045% Sulfur (S): ≤ 0.03% Iron (Fe): Balance Mechanical Properties (Annealed Plate - ASTM A240/ASME SA-240): Minimum Ultimate Tensile Strength (UTS): ≥ 515 MPa (75 ksi) Minimum 0.2% Yield Strength (YS): ≥ 205 MPa (30 ksi) Minimum Elongation (in 2 inches): ≥ 40% Maximum Hardness (Rockwell B): ≤ 95 (HRB) Key Characteristics and Benefits: Enhanced Corrosion Resistance: The addition of molybdenum significantly improves resistance to pitting and crevice corrosion, especially in chloride environments and seawater. Improved High-Temperature Strength: SS316 offers better strength and creep resistance at elevated temperatures than SS304. Cryogenic Toughness: The alloy maintains excellent toughness at sub-zero temperatures. Applications: Widely used in food processing, pharmaceutical equipment, marine environments, surgical implants, and industrial processes involving corrosive chemicals. Standard Specification References: ASTM A240 / ASME SA-240: A primary standard for the chemical and mechanical requirements of SS316 in plate, sheet, and strip forms. UNS S31600: The Unified Numbering System designation for SS316. “A4“ in “SS 316 sheets plates and sheets“ is a code used to specify the quality and type of stainless steel used. “A4“ specifically refers to the Austenitic class of stainless steel and the number “316“ indicates the specific alloy type within the Austenitic class. In this case, 316 is a type of stainless steel that is widely used for applications requiring good corrosion resistance and strength, such as for marine and chemical environments. Finish : Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA NO(8)