Our Stainless Steel 304 Seamless Pipe is manufactured to ASTM A312
TP304 standards, offering exceptional corrosion resistance,
high-temperature strength, and dimensional precision. Produced by
extruding solid billet without any weld seam, this seamless
stainless steel pipe is the preferred choice for critical
applications in chemical processing, food & beverage,
pharmaceutical, oil & gas, and power generation industries
where weld integrity is a primary concern.
Available in a full range of schedules (Sch 10, Sch 40, Sch 80, Sch
160) and sizes from 1/8″ to 24″ NPS, our SS 304 seamless pipe
delivers reliable performance in both high-pressure and
high-temperature environments.
What is Stainless Steel 304 Seamless Pipe?
Stainless Steel 304 is the most widely used austenitic stainless
steel grade, known for its excellent formability, weldability, and
corrosion resistance. When manufactured as a seamless pipe (per
ASTM A312 TP304), the product contains no longitudinal weld seam,
eliminating the risk of weld-related failures in critical service
conditions.
The seamless manufacturing process involves heating a solid
stainless steel billet and piercing it to create a hollow tube,
which is then rolled and drawn to achieve precise dimensions. This
results in a pipe with uniform wall thickness, superior mechanical
properties, and complete material homogeneity.
Key Specifications at a Glance:
| Specification | Details |
|---|
| Standard | ASTM A312 / ASME SA312 |
| Grade | TP304, TP304L , TP304H |
| Type | Seamless (SMLS) – No weld seam |
| Size Range | 1/8″ to 24″ NPS (DN6 to DN600) |
| Schedules | Sch 5S, 10S, 20, 30, 40S, 60, 80S, 100, 120, 140, 160, XXS |
| Lengths | Single Random (16-22 ft), Double Random (35-40 ft), or Custom |
| End Finish | Plain Ends, Beveled Ends, Threaded |
| Surface Finish | Mill Finish, Pickled & Annealed, Bright Annealed, Polished |
Chemical Composition of SS 304 Seamless Pipe (ASTM A312 TP304)
| Element | TP304 | TP304L | TP304H |
|---|
| Carbon (C) | ≤ 0.08% | ≤ 0.035% | 0.04 – 0.10% |
| Manganese (Mn) | ≤ 2.00% | ≤ 2.00% | ≤ 2.00% |
| Phosphorus (P) | ≤ 0.045% | ≤ 0.045% | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% | ≤ 0.030% | ≤ 0.030% |
| Silicon (Si) | ≤ 1.00% | ≤ 1.00% | ≤ 1.00% |
| Chromium (Cr) | 18.0 – 20.0% | 18.0 – 20.0% | 18.0 – 20.0% |
| Nickel (Ni) | 8.0 – 11.0% | 8.0 – 12.0% | 8.0 – 11.0% |
Mechanical Properties
| Property | TP304 | TP304L | TP304H |
|---|
| Tensile Strength (min) | 75 ksi (515 MPa) | 70 ksi (485 MPa) | 75 ksi (515 MPa) |
| Yield Strength (min) | 30 ksi (205 MPa) | 25 ksi (170 MPa) | 30 ksi (205 MPa) |
| Elongation (min) | 35% | 35% | 35% |
| Hardness (max HRB) | 90 | 90 | 90 |
Physical Properties of SS 304 Seamless Pipe
| Property | Value |
|---|
| Density | 8.0 g/cm³ (0.289 lb/in³) |
| Melting Point | 1400 – 1450°C (2550 – 2650°F) |
| Modulus of Elasticity | 193 GPa (28 x 10⁶ psi) |
| Thermal Conductivity (100°C) | 16.2 W/m·K |
| Specific Heat (0-100°C) | 500 J/kg·K |
| Electrical Resistivity | 72 μΩ·cm |
| Mean Coefficient of Expansion (0-315°C) | 17.2 µm/m·K |
Dimensions: 304 Seamless Pipe Schedule Chart
SS 304 seamless pipe follows the dimensional standards of ASME
B36.10 (for heavy wall) and ASME B36.19 (for stainless steel).
Below are common dimensions:
| NPS | OD (inches) | Sch 10S | Sch 40S | Sch 80S | Sch 160 |
|---|
| 1/2″ | 0.840 | 0.083″ | 0.109″ | 0.147″ | 0.188″ |
| 3/4″ | 1.050 | 0.083″ | 0.113″ | 0.154″ | 0.219″ |
| 1″ | 1.315 | 0.109″ | 0.133″ | 0.179″ | 0.250″ |
| 1-1/2″ | 1.900 | 0.109″ | 0.145″ | 0.200″ | 0.281″ |
| 2″ | 2.375 | 0.109″ | 0.154″ | 0.218″ | 0.344″ |
| 3″ | 3.500 | 0.120″ | 0.216″ | 0.300″ | 0.438″ |
| 4″ | 4.500 | 0.120″ | 0.237″ | 0.337″ | 0.531″ |
| 6″ | 6.625 | 0.134″ | 0.280″ | 0.432″ | 0.719″ |
| 8″ | 8.625 | 0.148″ | 0.322″ | 0.500″ | 0.906″ |
| 10″ | 10.750 | 0.165″ | 0.365″ | 0.594″ | 1.000″ |
| 12″ | 12.750 | 0.180″ | 0.375″ | 0.687″ | 1.125″ |
Note: Sch 40S and Sch 80S are the standard schedules for stainless
steel pipe. The "S" designation indicates stainless steel
dimensions.
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