ASTM A312 304 Stainless Steel Seamless Pipe
The ASTM A312 specification covers seamless and welded austenitic stainless steel pipes used for high temperature and general corrosive service. The 304 grade stainless steel is the most commonly used stainless steel alloy and is known for its excellent corrosion resistance, high strength, and good formability.
ASTM 304 Stainless Steel Seamless Pipe is commonly used in various industries such as oil and gas, chemical, petrochemical, food processing, pharmaceutical, and water treatment. It is also used in architectural applications, such as for handrails, balustrades, and structural components.
The dimensions and specifications of 304 Stainless Steel Seamless Pipe are defined by the ASTM A312 standard. It is available in various sizes ranging from 1/8" to 24" in nominal diameter and in various schedules (wall thicknesses) such as Sch 5, Sch 10, Sch 40, and Sch 80.
The 304 grade stainless steel used in this pipe has a composition of 18% chromium and 8% nickel, which gives it excellent corrosion resistance and durability. It is also non-magnetic and can be easily welded and fabricated.
| Specifications | ASTM A312, A213, A269 / ASME SA 312, SA 213, SA 269 |
| Dimensions | ASTM, ASME, and API |
| Seamless Pipe Size | 1/2″ NB – 16″ NB |
| Seamless Tube Size | 1/8" To 30″NB Inch OD: 0.35 to 6.35mm |
| Thickness | 0.35 mm – 50 mm |
| Specialized in | Large Diameter Pipe Size |
| Schedule | SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, SCH 80S, SCH60, SCH80, SCH120, SCH140, SCH160, SCH XXS, SCH XS |
| Type | Seamless Pipes, Seamless Tubes |
| Form | Round, Square, Hydraulic, U Shape, Rectangular, Pan Cake Coils, Coiled, Hex, Honed, Etc |
| Length | Single Random, Double Random & Required Length. |
| End | Plain End, Beveled End, Treaded End |
| Value Added Service | Draw & Expansion as per required Size & Length Polish (Electro & Commercial) Heat Treatment Bending Annealed & Pickled Sand Blasting Machining Etc. |
PHYSICAL PROPERTIES
| Grade | Density (kg/m3) | Specific Heat 0-1000C (J/kg.K) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Electrical Resistivity (n.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 304 | 8000 | 500 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 720 |
Grade Specifications
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 304 | S30400 | 304S31 | 58E | 1.4301 | X5CrNi18-10 | 2332 | SUS 304 |
Mechanical Properties
| Grade | 304 |
| Tensile Strength (MPa) min | 515 |
| Yield Strength 0.2% Proof (MPa) min | 205 |
| Elongation (% in 50mm) min | 40 |
| Hardness | |
| Rockwell B (HR B) max | 92 |
| Brinell (HB) max | 201 |
Grade Specifications
Chemical Composition of Stainless Steel Pipes & Tubes
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| SS 304 | 0.08 max | 2 max | 0.75 max | 0.045 max | 0.030 max | 18 – 20 | – | 8 – 11 | 0.10 max |
| SS 304L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.03 max | 18 – 20 | – | 8 – 13 | – |
| SS 316 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.00 – 18.00 | 2.00 – 3.00 | 11.00 – 14.00 | 0.10 max |
| SS 316L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.00 – 18.00 | 2.00 – 3.00 | 10.00 – 14.00 | 68.89 min |
| SS 904L | 0.020 max | 2.00 max | 1.00 max | 0.040 max | 0.030 max | 19.00 – 23.00 | 4.00 – 5.00 max | 23.00 – 28.00 | – |
Mechanical Properties of ASME SA 312 SS Pipes & Tubes
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| SS 304 | 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
| SS 316 | 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
| SS 904L | 7.95 g/cm3 | 1350 °C (2460 °F) | Psi – 71000 , MPa – 490 | Psi – 32000 , MPa – 220 | 35 % |
Stainless Steel 304 Pipe Applications & Usage:
Some of the major applications of grade stainless steel 304 Pipe include:
AISI 304 Pipe also useful for Gas scrubbing plants
INOX 304 Pipe are also suitable for Acetic, phosphoric and sulphuric acid processing plants
Alloy 304 Pipe available for Oil and Gas Production- offshore process equipment
SUS 304 Pipe are commonly used by Pulp and paper processing industries
SAE 304 Pipe for Flue gas desulfurization systems
UNS S30400 Pipe mainly used for Chemical process vessels
304 Stainless Steel ERW Pipe mainly used for Condensers in power generation
SS 304 Welded Pipe can be use in Petrochemical
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