sa 312 tp 304 specification

Overview of ASME SA 312 TP 304 Specification

ASME SA 312/SA 312M specifies seamless, straight-seam welded, and heavily cold-worked welded austenitic stainless steel pipes for high-temperature and general corrosive service, equivalent to ASTM A312/A312M. SA 312 TP 304 (UNS S30400) is a key grade, similar to SA 240 GR 304 (used for plates) but optimized for piping applications like SA 240 GR 304 pipe.

With a density of 8.00 g/cm³ and SA 240 304 non magnetic properties in the annealed state, SA 312 TP 304 is ideal for demanding environments. The specification covers dimensions, chemical composition, mechanical properties, and testing requirements (e.g., hydrostatic, nondestructive) to ensure performance. Gangsteel can source SA 312 TP 304 pipes and supplies related sa 240 gr 304 plates.

Chemical Composition of SA 312 TP 304

The chemical composition of SA 312 TP 304, as per ASME SA 312, ensures excellent corrosion resistance and formability:

• Chromium (Cr): Forms a passive oxide layer for corrosion resistance.
• Nickel (Ni): Enhances ductility and SA 240 304 non magnetic properties.
• Carbon (C): Limited to ≤0.08% for weldability, though SA 312 TP 304L (≤0.035%) is preferred for critical welds to avoid sensitization.

For comparison, SA 312 TP 304L and SA 240 GR 304L have lower carbon for enhanced weldability. See our sa 240 gr 304l for plate equivalents.

Mechanical Properties of SA 312 TP 304

The mechanical properties of SA 312 TP 304 for seamless and welded pipes (annealed condition) ensure suitability for high-pressure and corrosive environments:

*Source: ASME SA 312 standards, as of October 14, 2025. Properties are for seamless and welded pipes; heavily cold-worked pipes may have higher strength (e.g., 620 MPa tensile for Schedule 80S). For plate equivalents, see our SS 304 data sheet.

Physical Properties

• Density: 8.00 g/cm³ (SA 240 GR 304 density), ideal for lightweight piping.
• Melting Point: ~1400-1450°C, suitable for high-temperature service.
• Thermal Conductivity: 16.2 W/m·K, moderate for heat transfer.
• Coefficient of Thermal Expansion: 17.2 × 10⁻⁶/K, stable across temperatures.
• Electrical Resistivity: 0.72 × 10⁻⁶ Ω·m, good for non-conductive applications.

These properties align with SA 240 GR 304, supporting applications like plat stainless 304.

Corrosion Resistance and Weldability

SA 312 TP 304 offers excellent corrosion resistance in:

• Atmospheric conditions, freshwater, and mild acids (food-grade).
• General environments, outperforming SS204 vs SS 304 due to higher nickel content.

It’s less resistant to chloride-induced pitting compared to SA 312 TP 316L. Weldability is good with ER308 or ER308L fillers, but SA 312 TP 304L is preferred for critical welds to minimize sensitization. For chloride-heavy environments, explore our sa 240 gr 316l plate equivalents or asme sa 312/sa 312m stainless pipe.

Applications of SA 312 TP 304

SA 312 TP 304 is used in:

• Chemical Processing: Piping for mild corrosives, similar to SA 240 GR 304 pipe.
• Food and Beverage: Hygienic piping for liquids and solids.
• Oil and Gas: Pipelines requiring corrosion resistance.
• Pharmaceuticals: Non-reactive, cleanable piping for sterile environments.

For high-temperature applications, consider sa 240 gr 304h plates or related pipe grades.

Comparison with Other Grades

• Vs. SA 312 TP 304L: Lower carbon (≤0.035%) improves weldability, ideal for heavy welding.
• Vs. SA 312 TP 316L: Similar properties, but 316L’s molybdenum (2-3%) enhances pitting resistance, at a higher SS 304 steel price.
• Vs. SA 240 GR 304: Similar composition, but SA 312 TP 304 is optimized for pipes, while SA 240 GR 304 is for plates like plat SS 304 3mm.

For harsher conditions, explore our sa 240 gr 317l or sa 240 gr 321.

Pricing and Availability at Gangsteel

As of October 14, 2025, SA 312 TP 304 pipe prices vary by size and schedule, but plate equivalents (SA 240 GR 304, 2B finish, 3-6mm) range from $1.55-$3.50/kg globally. Gangsteel offers competitive pricing for sa 240 gr 304 plates at $1.60/kg FOB (MOQ 1 ton) and can source SA 312 TP 304 pipes upon request.

Why Choose Gangsteel?

Gangsteel supplies certified SA 240 GR 304 plates and can provide SA 312 TP 304 pipes, offering competitive SS 304 plate price and custom sizes like plate 2 mm SUS 304. For quotes or to learn what is SA 304, visit our astm a 240 stainless plate or asme sa 312/sa 312m stainless pipe pages, or email admin@gangsteel.com.