AISI 316 Grade Stainless Steel
AISI 316 stainless steel is one of the most widely used austenitic stainless steels. Due to the addition of Molybdenum (Mo), it has a great improvement in corrosion resistance and high temperature strength.
316L stainless steel is the low carbon version of AISI 316. SS316 is better than SS304 in terms of corrosion resistance, heat resistance and certain properties, but the price is higher than AISI 304, for more details, please check stainless steel grade 304 vs 316, and 316 vs 316L.
SS316 Data Sheet & Specification
ASTM SAE AISI 316 stainless steel data sheet and specification are listed in the table below, including chemical composition and properties.
SS 316 Chemical Composition
SS316 chemical composition is given in table 1.
Table-1, 316 stainless steel composition
|SS316 Chemical Composition % (≤)|
|ASTM||AISI (UNS)||C||Si||Mn||P||S||Cr||Ni||Mo||N||Notes (Product)|
|ASTM A240/A240M||316 (S31600)||0.08||0.75||2.00||0.045||0.030||16.0-18.0||10.0-14.0||2.00-3.00||0.10||Plate, Sheet, and Strip|
|ASTM A276/A276M||316 (S31600)||0.08||1.00||2.00||0.045||0.030||16.0-18.0||10.0-14.0||2.00-3.00||Bars and Shapes|
SS 316 Stainless Steel Properties
AISI ASTM 316 stainless steel properties such as physical properties, mechanical properties, magnetic properties are summarized in the tables below.
The following tables show AISI 316 mechanical properties such as yield strength, tensile strength, elongation and hardness, etc.
Table-2, SS 316 mechanical properties, data are for 25.4 mm (1 in.) diameter bar
|Steel (UNS)||Tensile Strength (MPa) ≥||Yield Strength ≥ (MPa) at 0.2% Offset||Elongation in 50 mm (%) ≥||Reduction in area (%)||Hardness (HBW) ≤||Condition|
|316 (S31600)||580||290||50||79 HRB||Annealed sheet|
|620||415||45||65||275||Annealed and cold-drawn bar|
Table 3, ASTM 316 Mechanical Properties
|ASTM 316 Mechanical Properties|
|ASTM||AISI (UNS)||Tensile Strength (MPa) ≥||0.2% Yield Strength ≥ (MPa)||Elongation in 50 mm (%, ≥)||Reduction of Area, %, ≥||Brinell Hardness (HBW) ≤||Rockwell Hardness (HRBW) ≤||Product||Conditions|
|ASTM A240/A240M||316 (S31600)||515||205||40||–||217||95||Plate, Sheet, and Strip||–|
|ASTM A276A/276M||515||205||40||50||–||–||Bars and Shapes||Annealed, Hot finished|
|620||310||30||40||–||–||Annealed, Cold finished, Dia ≤ 12.7mm|
|515||205||30||40||–||–||Annealed, Cold finished, Dia > 12.7mm|
SS 316 Physical Properties
- Density of stainless steel 316: 8.03g/cm3
- Melting point of stainless steel 316: 1370℃-1398℃
- Specific heat capacity: 502 J/(Kg·K) at 20℃
- Electrical resistivity: 0.74 μΩ·m (20℃);
- Magnetic permeability: 1.02 (Approximate)
- Elastic modulus: 193 GPa (28×106 psi)
- Thermal diffusivity: 4.05 mm2/s
- Thermal conductivity of stainless steel 316:
- 12.1 (20 ℃);
- 16.3 (100 ℃);
- 21.5 (500 ℃).
- Coefficient of thermal expansion
- 15.9 (20-100℃), linear;
- 16.2 (20-300℃), linear;
- 17.5 (20-500℃), linear;
316 Magnetic Properties
Type 316 steel is not magnetic, but may be weakly magnetic after cold working.
SS316 Heat Resistance
SS316 has good oxidation resistance in intermittent use below 871 °C and continuous use up to 927 °C in air. In the range of 427 °C – 857 °C, it is better not to continuously use SS 316, but when 316 stainless steel is continuously used outside this temperature range, it has good heat resistance. 316L stainless steel has better carbide precipitation resistance than AISI 316 and can be used in the above temperature range.
Solution Treatment (Annealing)
Annealing at a temperature range of 1010-1065 °C, then cooling rapidly. The stainless steel surface should be carefully cleaned before annealing and must be protected with vacuum, hydrogen or inert gas in order to prevent the formation of an oxide layer during the annealing process.
The temperature for homogenization heat treatment is about 1250℃.
Typical forging temperature is 925-1260 ℃ (1700-2300 ℉).
SS316 cannot be hardened by heat treatment, but can be hardened by cold working.
When the weldment is not suitable for complete annealing, the residual stress can be moderately lowered below 600 °C, which makes it have good creep resistance.
AISI 316 is suitable for cold working such as cold heading, cold drawn and cold riveting, but it is more difficult than carbon steel.
SS316 has higher strength and higher work hardening rate than carbon steel and low alloy steel, so it is more difficult to process. Therefore, greater power and lower processing speeds are required, which may result in shortened tool life and difficulty in obtaining a smooth surface.
Type 316 stainless steel has good weldability and does not require preheating, but requires a similar filler material composition but a high alloy content. To avoid weld cracking, ensure that the weld contains 5-10% ferrite during the welding process. To avoid weld corrosion, the carbon content can be reduced, for example using ultra-low carbon stainless steel 316L, stabilized stainless steel or adding niobium (Nb). For optimum corrosion resistance, softness and ductility, SS 316 may require subsequent reannealing after welding or heat treatment. Because chromium carbide with intergranular corrosion is dissolved during the annealing process.
Post weld heat treatment: If performed, 950-1150 ° C (1740-2100 ° F), or stress relief below 650 ° C (1200 ° F) to avoid weld corrosion.
AISI 316 has better corrosion resistance than 304 stainless steel and has good corrosion resistance in the production of pulp and paper. Moreover, 316 stainless steel is also resistant to corrosion in marine and aggressive industrial atmospheres.
The following is the application range of 316 stainless steel corrosion resistance chart in chloride ion media for reference.
The main uses are heat exchangers for pulp and paper equipment, dyeing equipment, film processing equipment, pipes, and materials for exterior use in coastal areas. Also used in the field of solenoid valves, mainly used for housings, clamps, spheres, valve bodies, valve seats, nuts, valve stems, etc.
AISI 316 Equivalent
ASTM type 316 stainless steel equivalent to ISO, European EN (Germany DIN, British BSI, France NF), Japanese JIS and Chinese GB standard (For reference).
Table-3, type 316 stainless steel equivalent chart.
|AISI 316 equivalent chart|
|US||European Union||Germany||Britain (UK)||ISO||Japan||China||Australia||India||Rusia||Korea|
|Standard||Grade (UNS)||Standard||Grade (Steel Number)||Standard||Grade (Steel Number)||Standard||Grade||Standard||Grade (ISO Number)||Standard||Grade||Standard||Grade||Standard||Grade||Standard||Grade||Standard||Grade||Standard||Grade|
|X5CrNiMo17-12-2 (1.4401)||DIN 17440||X5CrNiMo17-12-2 (1.4401)||BS970 :1996||316S16||ISO 15510||X5CrNiMo17-12-2 (4401-316-00-1)||JIS G4304||SUS316||GB/T 20878;|
0Cr17Ni12Mo2 (Old designation)