A312 304H Pipe Equivalent and Standards

At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply high-quality A312 304H stainless steel pipe compliant with ASTM A312 and ASME SA 312 standards. A312 304H stainless steel pipe, also known as TP304H or AISI 304H, is a high-carbon austenitic stainless steel designed for high-temperature service up to 1500°F (815°C), offering enhanced creep and rupture strength. This guide details the equivalents, standards, specifications, and applications of A312 304H stainless steel pipe. Contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet offerings.

Overview of A312 304H Stainless Steel Pipe

A312 304H stainless steel pipeis specified under ASTM A312 for seamless, welded, and heavily cold-worked austenitic stainless steel pipes for high-temperature and corrosive service. It is the pipe equivalent to SA 240 GR 304H plates, with high carbon (0.04-0.10%) for improved high-temperature strength. Non-magnetic with a density of 8.00 g/cm³, it is ideal for demanding environments like boilers and heat exchangers. See sa240 gr 304h for plate details.

Chemical Composition

The chemical composition of A312 304H stainless steel pipe is:

High carbon (0.04-0.10%) boosts creep resistance. See sa240 gr 304l for low-carbon variants.

Mechanical Properties

High strength at high temperatures (25.5 ksi allowable at 1000°F). See sa240 gr 304.

Physical Properties

• Density: 8.00 g/cm³.
• Melting Point: 1400-1450°C.
• Thermal Conductivity: 16.2 W/m·K.
• Coefficient of Thermal Expansion: 17.2 × 10⁻⁶/K.
• Max Service Temperature: 1500°F (815°C) continuous.

Corrosion Resistance

A312 304H stainless steel pipe resists mild acids and atmospheric conditions, outperforming SS204 vs SS 304. Higher carbon risks sensitization in welds; anneal for protection. See sa240 gr 316l for chlorides.

Weldability

Fair with ER308H fillers; low heat input (<2.0 kJ/mm) and annealing required. See sa240 gr 321.

Applications of A312 304H Stainless Steel Pipe

A312 304H stainless steel pipe is used in:

• Boiler and superheater tubes.
• Heat exchanger tubes.
• Power generation piping.
• High-temperature chemical processing lines.

For cost-effective alternatives, see sa240 gr 201.

Equivalents of A312 304H Stainless Steel Pipe

ASME SA 312 TP 304H: Direct equivalent for BPVC pressure vessels.

EN 1.4948: European equivalent with matching high-carbon composition for creep resistance.

JIS SUS 304H: Japanese standard for Asian markets.

GB 06Cr19Ni10H: Chinese equivalent for domestic manufacturing.

Pricing and Availability

As of October 19, 2025, A312 304H stainless steel pipe prices (Sch 10S, 1-4" OD) range from $1.80-$4.00/kg. Gangsteel offers $1.80/kg FOB (MOQ 1 ton) for sa240 gr 304h. Contact admin@gangsteel.com or visit astm a 240 stainless plate.

FAQ on A312 304H Pipe Equivalents

What is the ASME equivalent of A312 304H pipe?

ASME SA 312 TP 304H, identical for high-temperature boiler tubes.

What is the EN equivalent of A312 304H pipe?

EN 1.4948 (X6CrNi18-10), matching the high-carbon composition for creep resistance.

What is the JIS equivalent of A312 304H pipe?

JIS SUS 304H, used in Asia for piping and sheets with similar properties.

What is the GB equivalent of A312 304H pipe?

GB 06Cr19Ni10H, prevalent in Chinese manufacturing for high-temperature applications.

Why are equivalents important for A312 304H pipe?

They ensure global sourcing compatibility for high-temperature applications like boilers and heat exchangers.