ASTM A312 TP304L Stainless Steel Thick Wall Pipe

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of astm a312 tp304l stainless steel thick wall pipe in China. With abundant experience, we warmly welcome you to wholesale customized astm a312 tp304l stainless steel thick wall pipe from our factory. For price consultation, contact us.

GNEE is a supplier of ASTM A312 stainless steel pipes. We export TP304L stainless steel pipes to 50 countries annually, providing efficient and reliable support ranging from custom cutting to final technical delivery for critical energy projects.

We supply high-quality ASTM A312 TP304L thick-walled stainless steel pipes, available in both seamless and welded forms. TP304L seamless pipes (SMLS) are typically the preferred choice, as the heat-affected zone (HAZ) in thick-walled welded pipes is larger, posing potential risks under high-pressure conditions. If the contract specifications are not explicit, it is essential to confirm whether welded pipes (WLD) or heavily cold-worked pipes (HCW) are acceptable.

Our ASTM A312 TP304L thick-walled stainless steel pipes are specifically designed for high-pressure environments, structural support, and critical industrial applications. They undergo solution treatment at temperatures of no less than 1040°C, followed by rapid cooling (water quenching). We provide heat treatment records to verify that full solution annealing has been achieved. With a chemical composition containing C ≤ 0.03%, Cr 18–20%, and Ni 8–10.5%, this material effectively mitigates the risk of intergranular corrosion and ensures stable performance even after welding or during long-term service.

ASTM A312 TP304L Stainless Steel Thick Wall Pipe

ASTM A312 TP304L Stainless Steel  Pipe

For ASTM A312 TP304L stainless steel round pipes, wall thickness tolerances are controlled within a range of ±8% to ±10%, while eccentricity is typically maintained at ≤10%. This ensures uniform stress distribution and eliminates potential weak points that could arise during operation; beveling services are also available.

Chemical Composition Of ASTM A312 TP 304L Stainless Steel Seamless Pipe

Mechanical Properties Of ASTM A312 TP 304L Stainless Steel Seamless Pipe

Dimensional Tolerance Table for ASTM A312 TP304L Pipe

1. Outside Diameter (OD) Tolerance

2. Wall Thickness (WT) Tolerance

This is the most critical parameter for Thick Wall Pipes. ASTM A312 specifies a minimum wall thickness requirement.

MTR - Mill Test Report
The Heat Number matches the markings stenciled on the surface of the steel pipe. Although TP304L does not have mandatory hardness requirements, a hardness of HBW ≤ 192 is typically required.

GNEE always adheres to the product positioning of producing high-performance stainless steel pipes and continuously improves the quality. It has successively obtained a number of production licenses such as stainless steel pipe special equipment (pressure piping components) certification, British Lloyd's Register and PED product certification, and passed ISO9001:2008 quality management system, ISO14000:2004 environmental management system certification, and GB/T28001-2011 occupational health management system certification.

For thick-walled pipes, the risk of internal defects is higher than that for thin-walled pipes; therefore, the following requirements typically apply:
Hydrostatic Test: This is a standard requirement under ASTM A312 (unless superseded by ultrasonic or eddy current testing). Purchasers will verify that the test pressure meets the calculated value.
Ultrasonic Testing (UT): For thick-walled pipes, UT is considered more critical than Eddy Current Testing (ET), as ultrasonic waves can penetrate the thick walls to detect internal cracks, porosity, or slag inclusions.
Radiographic Testing (RT): In the case of thick-walled welded pipes, 100% radiographic testing of the weld seams is typically required.

Packaged using waterproof paper and steel strapping, meeting standard export requirements for sea freight and suitable for various modes of transport; packaging can also be customized according to client specifications.
Packaging
Standard Export Packaging for Stainless Steel Plates
1. Polished surface finish; 2. Strapped bundling;
3. Wooden crate packaging; Wooden pallet packaging.

Hydrostatic Test

Wooden crate packaging

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