TP304L Stainless Steel Seamless Pipe Comprehensive Analysis

TP304L stainless steel seamless pipe is an ultra-low carbon austenitic stainless steel pipe. With its excellent corrosion resistance, welding performance and low temperature toughness, it is widely used in petrochemical, food machinery, pharmaceutical equipment and cryogenic engineering. Its core advantage is that the carbon content is ≤0.03%, which effectively avoids the risk of intergranular corrosion.

International authoritative certification implementation standard

ASTM A312-seamless and welded austenitic stainless steel pipe

ASTM A790-general purpose ferritic/austenitic stainless steel seamless and welded steel pipe

ASMESA213-seamless ferritic and austenitic alloy steel pipes for boilers, superheaters and heat exchangers

ASME SA249-welded austenitic steel pipes for boilers, superheaters, heat exchangers and condensers

ASME SA789-general purpose seamless and welded ferritic/austenitic stainless steel pipes

GB/T14976-stainless steel seamless pipes for fluid transportation

TP304L stainless steel seamless pipe chemical composition

Note: Low carbon design significantly improves welding stability and resistance to intergranular corrosion.

TP304L stainless steel seamless pipe low temperature mechanical properties (0℃)

Tensile strength (σb) ≥485 MPa

Yield strength (σ0.2) ≥170 MPa

Elongation after fracture (δ5) ≥40%

Precision manufacturing process of TP304L stainless steel seamless pipe

1. Raw material preparation

Use high-quality TP304L stainless steel plate or round steel as raw material to ensure that the chemical composition and mechanical properties of the finished steel pipe meet the standards and are compatible with the casing pipe material specifications.

2. Perforation

The ring furnace is heated to 1150-1250℃, and perforated by the perforator, perforation → hot continuous rolling → sizing, to achieve efficient plastic deformation and form a hollow tube billet.

3. Hot rolling

The perforated tube billet is sent to the hot rolling unit, and through multiple rolling passes, the tube billet is gradually lengthened and thinned to reach the required size and shape.

4. Cold rolling or cold drawing

For seamless pipes that require higher precision and surface quality, cold rolling or cold drawing is also required. The cold rolling/cold drawing process improves the dimensional accuracy to ±0.05m and the surface roughness Ra≤0.8μm, further refines the grains, and improves the dimensional accuracy and surface finish of the steel pipe.

5. Heat treatment

In order to eliminate processing stress and improve the mechanical properties and corrosion resistance of steel pipes, the finished steel pipes need to be solution treated or stabilized.

6. Testing and inspection

The finished steel pipes are subjected to various tests such as water pressure test, eddy current flaw detection, and ultrasonic flaw detection to ensure that the product quality meets the relevant standards.

Industry application scenarios

1. Energy field

LNG cryogenic pipeline system, heat exchange tube bundle of refining unit.

2. Food and medicine

CIP cleaning pipes, bioreactor pipes.

3. Building decoration

Curtain wall support structure, high-end bathroom accessories.

Summary

TP304L stainless steel seamless pipe has become the preferred material for key industrial components through strict standard system and precision process control. Its mild steel pipe characteristics ensure excellent weldability and corrosion resistance. Mastering its performance parameters and production process will help engineering selection and quality control. If you need to obtain the latest technical specifications, please contact professional seamless pipe suppliers to obtain ASTM/EN certified product information.

Read more: Difference between seamless pipe and seam pipe