ASTM A376 Stainless Steel Seamless Pipe

ASTM A376 is the standard specification for seamless austenitic stainless steel pipes, primarily used for high-temperature service in boilers, superheaters, heat exchangers, and refining/chemical processing units. These pipes are manufactured through cold or hot finishing to ensure uniform wall thickness, excellent grain structure, and resistance to thermal fatigue.

GNEE supplies a full range of grades, including TP304/TP304H, TP316/TP316H/TP316L, TP321/TP347, and TP310S/TP309S, commonly used for general-purpose heat exchanger and furnace tubing.All products conform to ASTM A376/A376M dimensional and mechanical standards, Customizable sizes, wall thicknesses, and surface finishes to meet specific project requirements

Parameter	Specification
Standard	ASTM A376 / A376M
Steel Grades Available	TP304, TP304H, TP316, TP316L, TP321, TP347, TP310S, TP309S
Outer Diameter (OD)	6 mm – 610 mm (1/8" – 24")
Wall Thickness	1 mm – 50 mm (SCH 5 to SCH XXS and custom)
Pipe Length	5.8 m / 6 m / 11.8 m / 12 m (or custom cut-to-length)
Manufacturing Method	Seamless (cold-drawn or hot-finished)
Surface Finish	Annealed & Pickled / Bright Annealed / Polished
Tolerances	As per ASTM A999 / A376
Temperature Application	High temperature (up to 1100°C, depending on grade)
End Types	Plain End (PE), Beveled End (BE), Threaded (NPT/BSP)
Testing	PMI, Hydrostatic, Eddy Current, UT, Intergranular Corrosion (IGC) test

At GNEE, we offer:

ASTM A376 seamless pipes in TP304, TP316, TP321, TP347, TP310S, and other grades

Full NDT testing (Eddy current, PMI, UT, hydrostatic)

Third-party inspection (SGS, BV, TUV)

Export-standard packaging & fast global delivery

With over 18 years of experience in stainless steel pipe exports, we support industrial projects in thermal power, oil refining, petrochemical, and furnace manufacturing worldwide.

1. Polishing of stainless steel tubes
2. Beveling of stainless steel tubes
3. Honing and turning of stainless steel tubes
4. Heat treatment and annealing
5. Positive Material Identification (PMI)
PMI testing can be performed in-house on most stainless steel grades, or we can work with independent laboratories to complete PMI to meet customer specifications.
6. UT testing

1. What are the temperature limits for ASTM A376 pipes?
Depending on the grade, ASTM A376 pipes can withstand service temperatures up to 1100°C, especially grades like TP310S and TP309S.

2. What surface finishes are available for ASTM A376 pipes?
Available finishes include pickled, bright annealed (BA), and custom-polished surfaces based on customer requirements.

3. How do ASTM A376 pipes differ from ASTM A312?
While both cover austenitic stainless pipes, ASTM A376 focuses on high-temperature and boiler-related applications, whereas ASTM A312 covers general-purpose stainless steel pipes.

4. Are ASTM A376 pipes supplied in heat-treated condition?
Yes. These pipes are delivered in solution-annealed or stabilized-annealed condition as per specification to ensure optimum mechanical properties and corrosion resistance.