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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.
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.
The chemical composition of A312 304H stainless steel pipe is:
Element |
Range (%) |
---|---|
Carbon (C) |
0.04 - 0.10 |
Manganese (Mn) |
0.00 - 2.00 |
Silicon (Si) |
0.00 - 0.75 |
Phosphorus (P) |
0.00 - 0.045 |
Sulfur (S) |
0.00 - 0.030 |
Chromium (Cr) |
18.00 - 20.00 |
Nickel (Ni) |
8.00 - 10.50 |
Nitrogen (N) |
0.00 - 0.10 |
Iron (Fe) |
Balance |
High carbon (0.04-0.10%) boosts creep resistance. See sa240 gr 304l for low-carbon variants.
Property |
Value (Min) |
---|---|
Tensile Strength |
515 MPa (75 ksi) |
Yield Strength |
205 MPa (30 ksi) |
Elongation |
35% |
Hardness (Brinell) |
≤ 201 HB |
High strength at high temperatures (25.5 ksi allowable at 1000°F). See sa240 gr 304.
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.
Fair with ER308H fillers; low heat input (<2.0 kJ/mm) and annealing required. See sa240 gr 321.
A312 304H stainless steel pipe is used in:
For cost-effective alternatives, see sa240 gr 201.
Standard |
Equivalent Grade |
UNS Number |
---|---|---|
ASME SA 312 |
SA 312 TP 304H |
S30409 |
EN (Europe) |
1.4948 (X6CrNi18-10) |
S30409 |
JIS (Japan) |
SUS 304H |
S30409 |
GB (China) |
06Cr19Ni10H |
S30409 |
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.
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.
ASME SA 312 TP 304H, identical for high-temperature boiler tubes.
EN 1.4948 (X6CrNi18-10), matching the high-carbon composition for creep resistance.
JIS SUS 304H, used in Asia for piping and sheets with similar properties.
GB 06Cr19Ni10H, prevalent in Chinese manufacturing for high-temperature applications.
They ensure global sourcing compatibility for high-temperature applications like boilers and heat exchangers.
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