Grade AISI 316 Stainless Steel, SS 316 Properties, SS316 Composition

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ASTM SAE AISI 316 Stainless Steel SS316 SS 316 Type

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 % (≤)
ASTMAISI (UNS)CSiMnPSCrNiMoNNotes (Product)
ASTM A240/A240M316 (S31600)0.080.752.000.0450.03016.0-18.010.0-14.02.00-3.000.10Plate, Sheet, and Strip
ASTM A276/A276M316 (S31600)0.081.002.000.0450.03016.0-18.010.0-14.02.00-3.00Bars 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.

Mechanical Properties

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% OffsetElongation in 50 mm (%) ≥Reduction in area (%)Hardness (HBW) ≤Condition
316 (S31600)5802905079 HRBAnnealed sheet
5502406070212Annealed bar
6204154565275Annealed and cold-drawn bar

Table 3, ASTM 316 Mechanical Properties

ASTM 316 Mechanical Properties
ASTMAISI (UNS)Tensile Strength (MPa) ≥0.2% Yield Strength  ≥ (MPa)Elongation in 50 mm (%, ≥)Reduction of Area, %, ≥Brinell Hardness (HBW) ≤Rockwell Hardness (HRBW)  ≤ProductConditions
ASTM A240/A240M316 (S31600)5152054021795Plate, Sheet, and Strip
ASTM A276A/276M5152054050Bars and ShapesAnnealed, Hot finished
6203103040Annealed, Cold finished, Dia ≤ 12.7mm
5152053040Annealed, 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.

Heat Treatment

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.

Homogenization Treatment

The temperature for homogenization heat treatment is about 1250℃.

Forging

Typical forging temperature is 925-1260 ℃ (1700-2300 ℉).

Hardening

SS316 cannot be hardened by heat treatment, but can be hardened by cold working.

Stress Relieving

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.

Cold Working

AISI 316 is suitable for cold working such as cold heading, cold drawn and cold riveting, but it is more difficult than carbon steel.

Machining

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.

Welding

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.

Corrosion Resistance

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.

SS 304 316 stainless steel corrosion resistance chart in chloride medium

Applications

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
USEuropean UnionGermanyBritain (UK)ISOJapanChinaAustraliaIndiaRusiaKorea
StandardGrade (UNS)StandardGrade (Steel Number)StandardGrade (Steel Number)StandardGradeStandardGrade (ISO Number)StandardGradeStandardGradeStandardGradeStandardGradeStandardGradeStandardGrade
AISI SAE,
ASTM
316
(S31600)
EN 10088-2;
EN 10088-2
X5CrNiMo17-12-2 (1.4401)DIN 17440X5CrNiMo17-12-2 (1.4401)BS970 :1996316S16ISO 15510X5CrNiMo17-12-2 (4401-316-00-1)JIS G4304SUS316GB/T 20878;
GB/T 1220;
GB/T 3280
06Cr17Ni12Mo2;
0Cr17Ni12Mo2 (Old designation)
31604Cr17Ni12Mo208X17H13M2TSTS316

 

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