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

• Product type: Precision seamless austenitic stainless steel pipe (SML)

• Standard: ASTM A312 / A312M (ASME equivalent: SA-312 for code applications)

• Size system: NPS per ANSI B36.19 (other dimensions can be supplied if compliant)

• Length (typical): Random lengths up to 24 ft for many common sizes (cut lengths available by agreement)

• Delivery condition: Solution heat treated (annealed) as required by ASTM A312

• Testing: Each pipe is subject to hydrostatic or nondestructive electric test, plus required mechanical testing (per standard)

Key Features

• Enhanced chloride corrosion resistance: TP317L is a higher-molybdenum austenitic grade, commonly chosen for improved pitting/crevice corrosion performance vs. 316L in chloride exposure.

• Low carbon for weld integrity: The “L” grade helps reduce sensitization risk and supports reliable weld performance in corrosive service.

• 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

Mechanical Properties

Applicable Standards 

• ASTM / ASME: ASTM A312 / A312M (ASME SA-312 equivalent for code use)

• EN: EN 10216-5 (seamless stainless tubes for pressure purposes)

• GOST: GOST 9941 (seamless corrosion-resistant stainless pipes, commonly referenced in CIS)

• JIS: JIS G 3459 (stainless steel pipes; seamless and welded manufacturing covered)

• GB: GB/T 14976 (Seamless stainless steel pipes for fluid transport; latest edition published 2025-08-01, effective 2026-02-01)

Typical Application Areas

• Chemical & petrochemical processing: process piping, acid/chloride service lines, corrosive transfer lines

• Pulp & paper: bleaching chemical lines and chloride-bearing process systems

• Marine / desalination & water treatment: chloride-rich fluid handling where enhanced pitting resistance is required

• 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.