ASTM A312 TP317L Pipes A312 UNS S31703 Stainless steel Pipes,1.4438 Pipes
ASTM A312 TP317L stainless steel pipes are high-molybdenum austenitic stainless steel pipes designed for severe corrosive and pressure service applications.
Manufactured to ASTM A312 / ASME SA312, TP317L pipes offer superior resistance to pitting, crevice corrosion, and chemical attack, especially in environments where standard TP316L stainless steel is not sufficient.
Stainless steel grade 317L is a low carbon version of grade 317 stainless steel. It has the same high strength and corrosion resistance as 317 steel but can produce stronger welds due to the low carbon conten
Alloy 317L (UNS S31703) is a molybdenum-bearing austenitic stainless steel with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steels such as Alloy 304. In addition, Alloy 317L offers higher creep, stress-to-rupture, and tensile strength at elevated temperatures than conventional stainless steels. It is a low carbon or “L” grade which provides resistance to sensitization during welding and other thermal processes.
ASTM A312 TP317L Stainless Steel Seamless Pipes and Tubes specification:
Tubing Size : 1/8″NB TO 30″NB IN
Specialized in : Large Diameter Size
Tubing Schedule: SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Tubing Type : Seamless / ERW / Welded / Fabricated / LSAW Pipes
Form : Round, Square, Rectangular, Hydraulic Etc.
Length : Single Random, Double Random & Cut Length.
Tubing End : Plain End, Beveled End,
Chemical Composition of ASTM A312 TP317L Stainless Steel Seamless Pipes
The chemical composition of grade 317L Stainless Steel is outlined in the following table
| Element | Content (%) |
| Iron, Fe | Balance |
| Chromium, Cr | 18-20 |
| Nickel, Ni | 11-15 |
| Molybdenum, Mo | 3-4 |
| Manganese, Mn | 2 |
| Silicon, Si | 1 |
| Phosphorous, P | 0.045 |
| Carbon, C | 0.03 |
| Sulfur, S | 0.03 |
Mechanical Properties of ASTM A312 TP317L Stainless Steel Seamless Pipes
The Mechanical Properties of grade 317L Stainless Steel are displayed in the following table.
| Properties | Metric | Imperial |
| Tensile strength | 595 MPa | 86300 psi |
| Yield strength | 260 MPa | 37700 psi |
| Modulus of elasticity | 200 GPa | 29000 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 55% | 55% |
| Hardness, Rockwell B | 85 | 85 |
ASTM A312 TP317L COLD DRAW STAINLESS STEEL SEAMLESS PIPES
TESTING:
A. 100% PMI
B. HYDROSTATIC TEST (HOLD TIME=8S)/ET/UT
C. HEAT TREATMENT: 1900°F(1040℃ ), IN RAPIDLY COOLED BY WATER FOR 2MINS.
D. MATERIAL CONFORMS TO NACE MR-0175
E. INTERGRANULAR CORROSION TEST AS PER ASTM A262 PRACTIVE ’E’
F. FLATENING TEST: ASTM A999/999M
TP317L vs TP316L (Quick Comparison)
| Item | TP316L | TP317L |
|---|---|---|
| Mo Content | 2.0 – 3.0% | 3.0 – 4.0% |
| Corrosion Resistance | Very Good | Excellent |
| Typical Use | General corrosive service | Severe corrosive service |
ASTM A312 TP317L stainless steel pipes, equivalent to UNS S31703 and EN 1.4438, provide an excellent solution for highly corrosive and pressure-critical applications.
With enhanced molybdenum content, low carbon chemistry, and compliance with international standards, TP317L pipes ensure long service life and reliable performance in demanding industrial environments.
