ASTM A312 TP317L Stainless Steel Precision Seamless Pipe with Enhanced Chloride Corrosion Resistance and Low Carbon Weld Integrity
Product Details
ASTM A312 TP317L Stainless Steel Precision Seamless Pipe
,Enhanced Chloride Corrosion Resistance Austenitic Stainless Steel Pipe
,Low Carbon for Weld Integrity Precision Seamless Tube
ASTM A312 TP317L Stainless Steel Precision Seamless Pipe (Austenitic)
Material Overview
ASTM A312 TP317L is a low-carbon, molybdenum-alloyed austenitic stainless steel seamless pipe designed for high-temperature and general corrosive service. It is typically selected when 316L is not sufficient for chloride-bearing or acidic environments, thanks to its higher Mo and Ni content and improved pitting/crevice corrosion resistance.
Specifications
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Product type: Precision seamless austenitic stainless steel pipe (SML)
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Standard: ASTM A312 / A312M (ASME equivalent: SA-312 for code applications)
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Size system: NPS per ANSI B36.19 (other dimensions can be supplied if compliant)
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Length (typical): Random lengths up to 24 ft for many common sizes (cut lengths available by agreement)
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Delivery condition: Solution heat treated (annealed) as required by ASTM A312
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Testing: Each pipe is subject to hydrostatic or nondestructive electric test, plus required mechanical testing (per standard)
Key Features
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Enhanced chloride corrosion resistance: TP317L is a higher-molybdenum austenitic grade, commonly chosen for improved pitting/crevice corrosion performance vs. 316L in chloride exposure.
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Low carbon for weld integrity: The “L” grade helps reduce sensitization risk and supports reliable weld performance in corrosive service.
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Precision seamless construction: Seamless manufacturing avoids weld seam risks and is preferred for critical pressure/corrosion applications.
Our Advantages
1) “Can you prove compliance and traceability?”
Yes. We provide full inspection documentation (heat/lot traceability, chemistry, and mechanical results). ASTM A312 references mandatory mechanical testing and compliance requirements, and the standard requires documented testing/verification.
2) “How do you ensure leak-tightness and defect control?”
Every pipe is supplied with hydrostatic or nondestructive electric testing per ASTM A312/A999 practices, minimizing the risk of through-wall defects before shipment.
3) “Will it actually resist my chloride/acid media better than 316L?”
TP317L is specifically positioned for more aggressive corrosion conditions. Reputable alloy references highlight superior chloride pitting/general corrosion resistance compared with 304/316 families due to higher alloying levels.
Chemical Composition
| Grade (UNS) | C | Mn | P | S | Si | Cr | Ni | Mo | Ti | Nb+Ta |
|---|---|---|---|---|---|---|---|---|---|---|
| TP304L (S30403) | ≤0.035 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 18.0–20.0 | 8.0–13.0 | — | — | — |
| TP316L (S31603) | ≤0.035 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 16.0–18.0 | 10.0–14.0 | 2.00–3.00 | — | — |
| TP317L (S31703) | ≤0.035 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 18.0–20.0 | 11.0–15.0 | 3.0–4.0 | — | — |
| TP321 (S32100) | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 17.0–19.0 | 9.0–12.0 | — | per note* | — |
| TP347 (S34700) | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 17.0–19.0 | 9.0–13.0 | — | — | per note** |
Mechanical Properties
| Grade | Tensile Strength (min) | Yield Strength (min) |
|---|---|---|
| TP304L | 70 ksi (485 MPa) | 25 ksi (170 MPa) |
| TP316L | 70 ksi (485 MPa) | 25 ksi (170 MPa) |
| TP317L | 75 ksi (515 MPa) | 30 ksi (205 MPa) |
| TP321 (seamless) | 75/30 (t ≤ 3/8 in.); 70/25 (t > 3/8 in.) | per thickness above |
| TP347 | 75 ksi (515 MPa) | 30 ksi (205 MPa) |
Applicable Standards
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ASTM / ASME: ASTM A312 / A312M (ASME SA-312 equivalent for code use)
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EN: EN 10216-5 (seamless stainless tubes for pressure purposes)
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GOST: GOST 9941 (seamless corrosion-resistant stainless pipes, commonly referenced in CIS)
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JIS: JIS G 3459 (stainless steel pipes; seamless and welded manufacturing covered)
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GB: GB/T 14976 (Seamless stainless steel pipes for fluid transport; latest edition published 2025-08-01, effective 2026-02-01)
Typical Application Areas
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Chemical & petrochemical processing: process piping, acid/chloride service lines, corrosive transfer lines
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Pulp & paper: bleaching chemical lines and chloride-bearing process systems
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Marine / desalination & water treatment: chloride-rich fluid handling where enhanced pitting resistance is required
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High-temperature & general corrosive service piping: plant piping requiring A312 compliance and seamless reliability
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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