ASTM A312 TP304H Stainless Steel Seamless Pipe SCH80 High Temperature Boiler Tube
Product Introduction
ASTM A312 TP304H is a high carbon variant of the 304 grade, with a controlled carbon range of 0.04% to 0.10%. The higher carbon content delivers improved creep and rupture strength at elevated temperatures, making it a workhorse material for high-temperature steam and process service.
TP304H pipe is typically supplied solution annealed with a grain size of ASTM 7 or coarser to meet the elevated temperature design requirements of the ASME and ASTM specifications.
Chemical Composition
| Element |
ASTM A312 TP304H (%) |
| Carbon (C) |
0.04 - 0.10 |
| Silicon (Si) |
0.75 max |
| Manganese (Mn) |
2.00 max |
| Phosphorus (P) |
0.045 max |
| Sulfur (S) |
0.030 max |
| Chromium (Cr) |
18.0 - 20.0 |
| Nickel (Ni) |
8.0 - 11.0 |
Mechanical Properties
| Property |
Unit |
Value |
| Tensile Strength, min. |
MPa (ksi) |
515 (75) |
| Yield Strength (0.2% offset), min. |
MPa (ksi) |
205 (30) |
| Elongation in 2 in. or 50 mm, min. |
% |
35 |
| Hardness, max. |
HRB |
90 |
Applications
- Boiler tubes, superheaters and reheater tube systems
- High temperature steam and process piping
- Heat exchangers and pressure vessels in power plants
- Refinery and petrochemical high temperature service
- Industrial furnace and heat treatment equipment
- Steam distribution and turbine piping