What is S31608 material?
S31608 is an austenitic stainless steel grade, essentially the Chinese standard (GB/T 20878) designation for AISI 316 or European EN 1.4401, known for excellent corrosion resistance, especially against chlorides, due to added molybdenum; it offers good high-temperature strength and is used in various forms like pipes, sheets, and bars for demanding applications, particularly where pitting and crevice corrosion are concerns.
S31608 stainless steel equivalent grades
S31608 is the UNS number for Type 316H Stainless Steel, a higher carbon version of 316, with key equivalents being ASTM 316H, EN 1.4401/1.4919, and often associated with DIN X5CrNiMo17-12-2 (which is closer to standard 316/1.4401), with JIS SUS 316 as a general counterpart, all offering excellent corrosion resistance due to Molybdenum.
Chemical composition (mass fraction, wt.%) of S31608
| C(%) | Si(%) | Mn(%) | P(%) | S(%) | Cr(%) | Ni(%) | Mo(%) |
|---|---|---|---|---|---|---|---|
| 0.08 | 1.0 | 2.0 | 0.045 | 0.03 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
Mechanical Properties of steel grade S31608
| Yield Rₚ₀.₂ (MPa) | Tensile Rₘ (MPa) | Impact KV/Ku (J) | Elongation A(%) | Reduction in cross section on fracture Z(%) | As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 812 (≥) | 417 (≥) | 34 | 33 | 24 |
Physical Properties of steel grade S31608
| Temperature (℃) | Modulus of elasticity (GPa) | Mean coefficient of thermal expansion 10⁻⁶/(℃) between 20(℃) and | Thermal conductivity (W/m·℃) | Specific thermal capacity (J/kg·℃) | Specific electrical resistivity (Ω·mm²/m) | Density (kg/dm³) | Poisson's coefficient, ν |
|---|---|---|---|---|---|---|---|
| 32 | - | - | - | 0.12 | - | - | - |
| 916 | 634 | - | 14.3 | 212 | - | - | - |
| 272 | - | 24 | 42.2 |
S31608 vs 316L difference
The main difference between 316L (UNS S31603) and 316 (UNS S31600) is carbon content; 316L has lower carbon (max 0.03%) than 316 (max 0.08%), making 316L superior for welding as it resists "weld decay" (intergranular corrosion) better, while 316 offers slightly higher strength and hardness, but often needs post-weld treatment, making 316L the go-to for welded or sanitary applications.
S31608 vs ASTM 316 difference
S31608 is the grade designation for 316 stainless steel in the Chinese national standard (GB/T 20878). The compositional range of ASTM 316 (UNS S31600) under the ASTM A240/A312 standard is essentially the same as S31608, but the upper limit for carbon content is slightly wider (also ≤0.08%). The ASTM standard specifies sulfur content as ≤0.030–0.035% depending on the product form. Both standards specify a minimum tensile strength of 515 MPa, a yield strength of 205 MPa, and an elongation of 40%. They are interchangeable in most applications. The main differences lie in the standard systems and regional certification requirements, rather than in the inherent properties of the material itself.
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