what is ASME SA312 Specification?
ASME SA312 is a standard specification for seamless, welded, and heavily cold-worked austenitic stainless steel pipes intended for high-temperature and general corrosive service. It covers common grades like TP304/304L and TP316/316L, focusing on chemical composition, mechanical properties, and heat treatment.
What is the material grade SA312 TP 304?
ASME SA312 TP304 is a standard specification applicable to seamless, welded, and heavily cold-worked austenitic stainless steel pipes, primarily intended for use in high-temperature and general corrosive service conditions. This material typically consists of 18% chromium and 8% nickel, with a tensile strength of 515 MPa [75 ksi] and a yield strength of 205 MPa [30 ksi].
SA 312 Gr 304 Tube Chemical Composition
| GRADES | UNS | C | Mn | P | S | Si | Cr | Ni |
|---|---|---|---|---|---|---|---|---|
| TP304 | S30400 | 0.08 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 8.0-11.0 |
ASTM A312 304 Stainless Steel Tube Mechanical Properties
| Material | Temperure | Yield Strength | Tensile Strength | Heat | Elongation %, Min |
|---|---|---|---|---|---|
| Min.º F(º C) | Ksi (MPa), Min. | Ksi (MPa), Min. | Treatment | ||
| TP304 | 1900 (1040) | 30(205) | 75(515) | Solution | 35 |
ASME SA 312 304 Cold Drawn Seamless Tube Physical Properties
| Grade | Elastic Modulus (GPa) | Density (kg/m3) | Thermal Conductivity (W/m.K) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Electrical Resistivity (nΩ.m) | Specific Heat 0-100°C (J/kg.K) | |||
|---|---|---|---|---|---|---|---|---|---|
| at 100°C | at 500°C | 0-100°C | 0-315°C | 0-538°C | |||||
| 304 | 193 | 8000 | 16.2 | 21.5 | 17.2 | 17.8 | 18.4 | 720 | 500 |
304 Stainless Steel Pipe Tolerances
| Nominal Pipe Size (NPS) | ASTM A312 304 Welded Pipe |
|---|---|
| IPS 1/4 to 1-1/2 | +.015/-.031 |
| IPS 2 to 4 | +.031/-.031 |
| IPS 5 to 8 | +.093/-.031 |
SA 312 TP 304 Welded Tube Weight Chart
| NPS (DN) | ID | SCH | OD IN (Milimeter) | WEIGHT LB/FT (KG/M) | WT IN (Milimeter) |
|---|---|---|---|---|---|
| 32 (800) | .0.0.0 | .0.0.0 | 32.00 (813) | 84.085 (126.032) | 0.025 (6.035) |
| 32 (800) | .0.0.0 | .0.0.0 | 32.00 (813) | 95.028 (141.09) | 0.0281 (7.014) |
| 32 (800) | .0.0.0 | 10 | 32.00 (813) | 105.069 (157.025) | 0.0312 (7.092) |
| 32 (800) | .0.0.0 | .0.0.0 | 32.00 (813) | 116.041 (173.035) | 0.0344 (8.074) |
| 32 (800) | STD | .0.0.0 | 32.00 (813) | 126.078 (188.083) | 0.0375 (9.053) |
| 32 (800) | .0.0.0 | .0.0.0 | 32.00 (813) | 137.012 (204.009) | 0.0406 (10.031) |
| 32 (800) | .0.0.0 | .0.0.0 | 32.00 (813) | 147.078 (220.01) | 0.0438 (11.013) |
| 32 (800) | .0.0.0 | .0.0.0 | 32.00 (813) | 158.008 (235.029) | 0.0469 (11.091) |
| 32 (800) | XS | 20 | 32.00 (813) | 168.037 (250.065) | 0.05 (12.07) |
| 32 (800) | .0.0.0 | .0.0.0 | 32.00 (813) | 188.087 (281.009) | 0.0562 (14.027) |
| 32 (800) | .0.0.0 | 30 | 32.00 (813) | 209.062 (312.017) | 0.0625 (15.088) |
HS Code For stainless steel pipe 304
| Product | Country | HS Code |
|---|---|---|
| 304 Stainless Steel Pipe | Malaysia | 73049000 |
| Maldives | 73042400 | |
| Netherlands | 73044100 | |
| Singapore | 73049000 | |
| Italy | 73044100 | |
| Oman | 73049000 | |
| Qatar | 73041990 | |
| China | 73041110 | |
| United Arab Emirates (UAE) | 73041990 | |
| Saudi Arabia (KSA) | 73049000 |
What is the difference between ASTM A312 TP304 and TP316?
The primary difference between ASTM A312 TP304 and TP316 is that TP316 contains 2–3% molybdenum, offering superior corrosion resistance (especially against chlorides and pitting) compared to TP304, which contains little to no molybdenum. TP304 is the standard, lower-cost stainless steel for general use, while TP316 is suited for marine and high-corrosion chemical environments.
A312 TP 304 Stainless Steel Pipe Applications
ASTM A312 TP304 stainless steel pipes are versatile, austenitic pipesknown for high corrosion resistance, excellent strength, and durabilityat temperatures up to 870°C. They are widely used in petroleum,chemical, pharmaceutical, food processing, water treatment, andmarine applications. These pipes are frequently used forprocessing, transport, and structural tasks.
Lead Time
Typically, packaging and delivery to the port (Tianjin, Shanghai, or Qingdao) can be completed within 3 to 7 days.
If special wall thicknesses (such as extra-thick pipes) or specific lengths are required, the lead time is generally around 15 to 45 days.
Non-Destructive Testing (NDT):
Eddy Current Testing (ET): Detects surface and near-surface defects.
Ultrasonic Testing (UT): Detects internal defects.
Hydrostatic Testing: Verifies the leak-tightness and pressure-bearing capacity of piping under high pressure (mandatory for TP304).
Intergranular Corrosion Testing: Conducted in accordance with ASTM A262 (per client requirements) to ensure the absence of corrosion risks.
Packaging Methods
To prevent scratches, deformation, or moisture damage during sea or land transport:
End Protection: Plastic caps are fitted to both ends of the pipes to prevent dust ingress and protect the pipe openings from impact damage.
Bundling: Small-diameter pipes are typically bundled using steel straps and wrapped externally with woven nylon fabric or plastic film.
Crate Packing: For precision tubes or thin-walled pipes, fumigation-free wooden crates or metal frames are utilized to prevent compression damage.
Marking & Labeling: Each pipe is clearly stenciled on its surface with markings indicating the material grade (TP304), standard (A312), specifications (Size/Schedule), and Heat Number.
