Seamless Stainless steel TP304L pipe
Due to its reduced carbon content, our TP304L tubing offers superior intergranular corrosion resistance, making it the ideal choice for heavy-gauge welded components in chemical processing, cryogenic applications, and pharmaceutical systems. Through advanced cold-drawing and bright annealing processes, GZH ensures every pipe maintains precise dimensional tolerances and a high-quality surface finish. Rely on our expertise for certified stainless steel solutions that guarantee long-term structural integrity in corrosive environments.
Seamless Stainless Steel TP304L Pipe – Low-Carbon Austenitic Stainless Steel for Welded and Corrosion-Resistant Systems
ASeamless Stainless Steel TP304L Pipe is a corrosion-resistant industrial pipe manufactured from a solid stainless steel billetthroughhot extrusion or cold drawing processes. The seamless manufacturing method eliminates longitudinal weld seams, ensuring uniform metallurgical structure, improved pressure resistance, and consistent mechanical properties.
Under the ASTM A312 / ASME SA312 specification,TP304L stainless steel is a low-carbon version of Type 304 austenitic stainless steel. It is commonly dual-certified as EN 1.4307.
The defining feature of 304L stainless steel is its reduced carbon content (maximum 0.03%), compared with 0.08% in standard 304 stainless steel. This lower carbon level significantly reduces the risk of chromium carbide precipitation during welding, preventing intergranular corrosion in the heat-affected zone (HAZ).
Because of these characteristics, ASTM A312 TP304L seamless pipes are widely used in industries requiring extensive welding, high corrosion resistance, and long-term structural reliability.
Key Technical Advantages of TP304L Seamless Pipe
Using304L stainless steel in seamless pipe form provides several important engineering advantages in demanding industrial environments.
Resistance to Intergranular Corrosion
Thelow carbon composition prevents the formation of chromium carbides at grain boundaries during exposure to temperatures between 425°C and 815°C, a phenomenon known as sensitization. This ensures the material maintains its corrosion resistance after welding.
Excellent Weldability
Because of its low carbon content, TP304L stainless steel often does not require post-weld heat treatment, reducing fabrication time and installation costs for large piping systems.
High Pressure Reliability
Theseamless pipe structure eliminates longitudinal weld seams, resulting in improved structural integrity and higher allowable working pressures in critical process systems.
Superior Formability and Fabrication Performance
TP304L stainless steel maintains excellent ductility and workability, allowing the pipe to be easily processed through bending, flanging, forming, and complex piping fabrication.
Excellent Low-Temperature Toughness
As an austenitic stainless steel, TP304L retains high impact toughness and mechanical stability at cryogenic temperatures, making it suitable for low-temperature applications.
Product Specifications and Data
To provide a comprehensive understanding of our Seamless Stainless steel 304L pipe, here are the detailed technical specifications and performance data.
Table 1: Chemical Composition of 304L Stainless Steel
The exceptional properties of 304L are a direct result of its specialized low-carbon chemical composition.
Grade | C | SI | Mn | Cr | Ni | S | P |
| 304 | ≤ 0.08 | ≤1.00 | ≤2.00 | 18.00-20.00 | 8.00-11.00 | ≤0.03 | ≤0.045 |
| 304L | ≤0.035 | ≤1.00 | ≤2.00 | 18.00-20.00 | 8.00-12.00 | ≤0.03 | ≤0.045 |
| 304H | 0.04-0.10 | ≤1.00 | ≤2.00 | 18.00-20.00 | 8.00-11.00 | ≤0.03 | ≤0.045 |
Table 2: Typical Mechanical Properties of Seamless Stainless steel TP304L pipe
Despite its lower carbon content, 304L maintains excellent mechanical properties.
| Material | Tensile Strength ksi(MPa) | Yield Strength ksi(MPa) | Elongation (%) | Hardness Brinell/Vickers | Hardness Rockwell |
| 304 | ≥75(515) | ≥30(205) | ≥ 35 | ≤192HBW/200HV | ≤90HRB |
| 304L | ≥70(485) | ≥25(170) | ≥ 35 | ≤192HBW/200HV | ≤90HRB |
| 304H | ≥75(515) | ≥30(205) | ≥ 35 | ≤192HBW/200HV | ≤90HRB |
Table 3: Typical Physical Properties of Seamless Stainless steel TP304L pipe
Here are some of the key physical properties of 304L that dictate its performance in various applications.
Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
8.0 g/cm³ | 1400-1450 ℃ | 17.2 µm/m·℃ | 16.2 W/m·K | 193 GPa | 0.72 µΩ·m |
Table 4: The Standard of Stainless Steel Seamless Pipe Size Tolerance Size Chart :
| Standard | OD(D) | Tolerance（MM) | Thickness(S) | Tolerance(MM) | Length | Tolerance | |
| MM | Common | High | MM | MM | |||
| ASTM A312 | D≤48.3 | +0.4/-0.8 | 10.3 | +20%-12.5% | +6.0/0 | ||
| 48.3 | ±0.8 | 88.9 | +22.5%/-12.5% | ||||
| 114.3 | +1.6/-0.8 | 88.9 | +15%/-12.5% | ||||
| 219.1 | +2.4/-0.8 | D≥508, t/D≤5%,SMLS | +22.5%/-12.5% | ||||
| 457.2 | +3.2/-0.8 | D≥508, t/D>5%,SMLS | +15%/-12.5% | ||||
| 660.4 | +4.0/-0.8 | D≥508, WELD | +17.5%/-12.5% | ||||
| 863.6 | +4.8/-0.8 | ||||||
| JIS 3459 Hot-Finished Smls Pipe | D＜50 | ±0.51 | S＜4 | ±0.5 | |||
| D≥50 | ±1.0% | S≥4 | ±12.5% | ||||
| JIS 3459 Cold-Finished | D＜30 | ±0.3 | S＜2 | ±0.2 | |||
| D≥30 | ±1.0% | S≥2 | ±10.0% | ||||
| JIS G3463 Hot-Finished Smls Pipe | 100 | +0.4/-0.8 | D＜100， S<2 | / | D<50, L<7M | +7/0 | |
| D＜100， 2≤S<2.4 | +40%/0 | D<50,7< L<10M | +10/0 | ||||
| D＜100， 2.4≤S<3.8 | +35%/0 | ||||||
| D＜100， 3.8≤S<4.6 | +33%/0 | ||||||
| D＜100， 4.6≤S | +28%/0 | D<50,10< L<13M | +13/0 | ||||
| 100≤D<120 | +0.4/-1.2 | D>100, S＜2 | / | ||||
| 120≤D<160 | D>100， 2≤S<2.4 | / | D<50,13M< L | +15/0 | |||
| 160≤D<200 | +0.4/-1.8 | D>100， 2.4≤S<3.8 | +35%/0 | ||||
| 200≤D | +0.4/-2.4 | D>100， 3.8≤S<4.6 | +33%/0 | D>50,7< L<7M | +10/0 | ||
| D>100， 4.6≤S | +28%/0 | ||||||
| JIS G3463 Cold-finished | <60 | +0.4/-0.8 | D<40, S<2.0 | +0.4/0 | |||
| 60≤D<80 | ±0.3 | D<40, S≥2.0 | +20%/0 | D>50,7< L<10M | +13/0 | ||
| 80≤D<100 | ±0.4 | D≥40 | +22%/0 | ||||
| 100≤D<120 | +0.4/-0.6 | ||||||
| 120≤D<160 | +0.4/-0.8 | D>50,10M< L | +15/0 | ||||
| 160≤D<200 | +0.4/-1.2 | ||||||
| 200≤D | +0.4/-1.6 | ||||||
| GB/T 14975 冷拔(扎)钢管 | D<12.7 | ±0.3 | ±0.1 | 所有壁厚，普通级PA | +12.5%/-10% | ||
| 12.7 | ±0.15 | ||||||
| 38.1 | ±0.4 | ±0.3 | |||||
| 88.9 | ±0.9% | ±0.4 | |||||
| 139.7 | ±0.8 | 所有壁厚，高级PC | ±10% | ||||
| 203.2 | ±1.1 | ||||||
| 219.1 | ±1.6 | ||||||
| D≥323.9 | ±0.5% | ||||||
| GB/T 14976 冷拔(轧)钢管 | 6 | ±0.2 | ±0.15 | S≤3 | ±12%(10% /0高级PC) | ||
| 10≤D<30 | ±0.2 | ±0.2 | |||||
| 30≤D<50 | ±0.2 | ±0.3 | S>3 | +12.5%/-10%(10%/0高级PC) | |||
| 50≤D<219 | 0.85% | 0.75% | |||||
| D>219 | 0.9% | 0.8% | Smin, all | +22%/0(+20%/0高级PC) | |||
Typical Applications of ASTM A312 TP304L Seamless Pipe
Due to its corrosion resistance and excellent weldability, TP304L seamless stainless steel pipe is widely used in industries that require extensive welding and high structural reliability.
Petrochemical and Oil Refining
- Process piping systems
- Heat exchanger tubing
- Corrosion-resistant pipelines
- Field-welded piping installations
Nuclear and Power Generation
- Cooling water systems
- Structural containment components
- Corrosion-resistant piping for high-reliability systems
Chemical Processing Industry
TP304L pipes are commonly used for handling:
- Nitric acid
- Oxidizing chemicals
- Industrial solvents
- Corrosive process fluids
High-Purity Processing Industries
Because of its smooth internal surface and hygienic properties, TP304L is widely used in:
- Food and beverage processing
- Pharmaceutical manufacturing
- Biotechnology production systems
- CIP (Clean-in-Place) sanitary piping systems
Quality Assurance and Compliance Standards
To ensure reliability and full traceability, all Seamless Stainless Steel TP304L Pipes are supplied with comprehensive testing and certification documentation in compliance with ASTM A312 / ASME SA312 standards.
Certification & Test | Technical Description |
Material Test Certificates | Fully compliant with EN 10204 3.1 / 3.2 certification |
Alloy Verification | 100% Positive Material Identification (PMI) to confirm chemical composition |
Non-Destructive Testing | Ultrasonic Testing (UT) and Eddy Current Testing (ECT) according to ASTM E213 |
Pressure Testing | Hydrostatic pressure testing to verify pipe integrity |
Dimensional Inspection | Precision measurement of OD, wall thickness (WT), and surface roughness (Ra) |
Heat Treatment Records | Solution annealing documentation and metallurgical grain size analysis |
