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Centerway steel specializes in the production of the stainless steel pipe and fittings, and large inventory of resources, Factory direct sales
Centerway steel specializes in the production of the stainless steel pipe and fittings, and large inventory of resources, Factory direct sales
Type 316/ 316L/316H are austenitic stainless steel intended for use in applications that require high strength, toughness and workability, as well as enhanced corrosion resistance.
316/316L/316H stainless steel pipe normally refers to ASTM A312 TP316 pipe. It covers TP316, TP316L, TP316H, TP316Ti, TP316N, TP316LN, major difference between these grade is the chemical composition on carbon, Ti, Nitrogen.
Grade 316L refers S31603 UNS desination 1.4404, it has better corrosion resistance than TP316 because of the lower Carbon content. 316L maximum carbon content 0.03% which 316 maximum 0.08%, higher carbon will increase intergranular corrosion. Therefore, 316L is suitable for applications where carbon precipitation needs to be avoided. This stainless steel is widely used for welding the components, its special carbon content combined with welding ensures maximum resistance to general corrosion, especially applicable for heavy duty components.
316L is considered more resistant to oxidation than Type 316, especially in warm marine environments. Again, its low carbon content protects it from carbon precipitation. The metal also exhibits resistance at extremely low temperatures, even down to cryogenic levels. In terms of heat resistance, 316L exhibits better creep resistance, fracture stress resistance and overall strength than other stainless steel grades.
Many of the same working practices that are valid for Type 316 can also be used for 316L, including weldability and cold work hardening. In addition, 316 does not require post-service annealing to maximize its corrosion resistance, but annealing may be used in some cases.
Standard
Stainless steel pipes：ASTM A312 TP316/TP316L/TP316H, ASTM A269, ASTM A270
Stainless steel pipe fittings: ASTM A420 WP316/WP316L/WP316H/
Stainless steel flanges: ASTM A182 F316/F316L/F316H
Stainless steel plates: ASTM A240 Type 316/316L/316H
German standard: DIN17400 1.4404
European standard: EN10088 X2CrNiMo17-12-2
Chemical Composition
|
Grade |
316 |
316L |
|
UNS Designation |
S31600 |
S31603 |
|
Carbon (C) Max. |
0.08 |
0.030* |
|
Manganese (Mn) Max. |
2.00 |
2.00 |
|
Phosphorous (P) Max. |
0.045 |
0.045 |
|
Sulphur (S) Max. |
0.030 |
0.030 |
|
Silicon (Si) Max. |
1.00 |
1.00 |
|
Chromium (Cr) |
16.0 – 18.0 |
16.0 – 18.0 |
|
Nickel (Ni) |
10.0 – 14.0 |
10.0 – 14.0 |
|
Molybdenum (Mo) |
2.0 – 3.0 |
2.0 – 3.0 |
|
Nitrogen (N) |
— |
— |
|
Iron (Fe) |
Bal. |
Bal. |
|
Other Elements |
— |
— |
Physical Properties
|
Alloy |
UNS Design |
Spec. |
Tensile Strength |
Yield Strength |
||||||||||
|
psi |
MPa |
ksi |
psi |
MPa |
ksi |
Elongation in 2 inches (min.) % |
Grain Size Req. |
Max. Hardness |
Modulus of Elasticity (x106 psi) |
Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) |
Thermal |
|||
|
316 |
S31600 |
A249, A312 |
75,000 |
515 |
75 |
30,000 |
205 |
30 |
35 |
— |
90 Rb |
28.0 |
9.2 |
116 |
|
316L |
S31603 |
A270, A312 |
70,000 |
485 |
70 |
25,000 |
170 |
25 |
— |
— |
90 Rb |
28.0 |
9.2 |
116 |
|
316H |
S31609 |
— |
— |
— |
— |
— |
— |
— |
— |
7 or coarser |
— |
— |
— |
— |
Applications
TP316/316L seamless pipe is used for liquid or gas pressure transfer in water treatment, waste water treatment, petrochemical, chemical, pharmaceutical and other industries. And structural applications include handrails, poles and support pipe for salt water and corrosive environments. Compared with TP304 stainless steel, TP316 stainless steel pipe has lower weldability, therefore it is not used as often as welded pipe unless its superior corrosion resistance exceeds weldability.
