Seamless Stainless Steel TP304 Pipe
Our TP304 seamless pipes offer exceptional corrosion resistance and mechanical strength, making them indispensable for chemical processing, oil & gas, and high-pressure construction projects. Known for its superior formability and weldability, our 304 stainless steel tubing is also a reliable choice for the food and beverage industry, ensuring long-lasting performance and hygienic integrity. Through advanced cold-drawing and vacuum annealing, GZH guarantees tight dimensional tolerances and a superior surface finish for every order.
Seamless Stainless Steel TP304 Pipe – Versatile Corrosion-Resistant Austenitic Stainless Steel Pipe
ASeamless Stainless Steel TP304 Pipe is a high-quality industrial pipe manufactured from a solid stainless steel billetusinghot extrusion or cold drawing processes. Unlike welded pipes, seamless pipes contain no longitudinal weld seams, ensuring a uniform metallurgical structure and superior mechanical reliability.
Under the ASTM A312 specification,TP304 (Type 304 Stainless Steel) is an austenitic chromium-nickel alloy widely recognized as the most commonly used stainless steel grade worldwide.
The alloy typically contains 18% chromium and 8% nickel, often referred to as 18/8 stainless steel. This composition provides excellent corrosion resistance, weldability, formability, and oxidation resistance, making ASTM A312 TP304 seamless pipes suitable for a wide range of industrial applications.
Because of its balanced performance and cost efficiency, 304 stainless steel seamless pipe has become the industry standard material for general corrosion-resistant piping systems.
Key Technical Advantages of TP304 Seamless Pipe
ChoosingSeamless TP304 Stainless Steel Pipe provides several important engineering benefits compared with welded alternatives.
Excellent Corrosion Resistance
Thehigh chromium-nickel content forms a stable passive oxide layer on the steel surface, providing strong resistance to oxidation, atmospheric corrosion, moisture, and a wide range of organic and inorganic chemicals.
Higher Pressure Capability
Because seamless pipes do not contain weld seams, they eliminate the weld efficiency factor typically applied to welded pipes, allowing for higher allowable working pressures and improved operational safety.
Uniform Mechanical Properties
The absence of a heat-affected zone (HAZ)ensuresconsistent tensile strength, yield strength, and hardness across the entire pipe wall.
Hygienic Internal Surface
Thesmooth internal bore of TP304 seamless tubing minimizes bacterial growth, scale formation, and sediment buildup, which is essential for sanitary processing systems.
Excellent Low-Temperature Toughness
Austenitic stainless steel maintains high impact toughness and ductility at cryogenic temperatures, making it suitable for low-temperature and LNG applications.
Table 1: Chemical Composition of 304 Stainless Steel
The superior properties of TP304 stainless steel are a direct result of its precisely controlled chemical composition. Below are the typical elemental content ranges for this grade:
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 TP304 Stainless Steel
Mechanical properties are key indicators of how a material behaves under various forces. These figures directly relate to the strength, ductility, and overall resilience of TP304 seamless pipes.
| 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 | ≤90HR |
Table 3: Typical Physical Properties of TP304 Stainless Steel
Physical properties dictate a material's inherent characteristics under different environmental conditions, such as density, melting point, and thermal conductivity.
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 TP304 Seamless Pipe
Due to its versatility and compliance with ASME and ASTM standards,TP304 seamless stainless steel pipe is widely used across multiple industries.
Oil & Gas and Petrochemical Industry
- Instrumentation tubing
- Low-pressure process piping
- Heat exchanger systems
- Corrosion-resistant fluid transport lines
Food and Beverage Processing
TP304 stainless steel is widely recognized as the preferred material for hygienic piping systems, including:
- Breweries and beverage production lines
- Dairy processing equipment
- Liquid food transport systems
Pharmaceutical and Biotechnology
The smooth surface and corrosion resistance of 304 stainless steel tubing make it suitable for:
- Purified Water (PW) systems
- Water for Injection (WFI) systems
- Sterile process piping
Chemical Processing Industry
TP304 pipes are commonly used for transporting:
- Mild acids
- Alkalis
- Chemical solvents
- Process fluids requiring corrosion resistance
Architectural and Structural Applications
Because of its clean appearance and long-term durability, TP304 stainless steel pipe is also used in:
- Architectural railings
- Structural supports
- Decorative stainless steel structures
Quality Assurance and International Compliance
To guarantee consistent quality and full traceability, all Seamless TP304 Stainless Steel Pipes are supplied with comprehensive testing and certification documentation.
Certification & Test | Technical Description |
Material Test Certificates (MTC) | Fully compliant with EN 10204 3.1 / 3.2 certification standards |
Material Verification | 100% Positive Material Identification (PMI) to verify alloy composition |
Non-Destructive Testing (NDT) | Ultrasonic Testing (UT) and Eddy Current Testing (ECT) for internal defect detection |
Pressure Testing | Hydrostatic pressure testing to ensure leak-free performance |
Dimensional Inspection | Full dimensional inspection and surface roughness (Ra) measurement |
Heat Treatment Records | Solution annealing charts and quenching documentation |
