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At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply high-quality A240 304H stainless steel plates compliant with ASTM A240 and ASME SA 240 standards. A240 304H, also known as AISI 304H, UNS S30409, or EN 1.4948, is a high-carbon austenitic stainless steel optimized for high-temperature strength and creep resistance up to 1500°F (815°C). This guide explains the P Number, welding group, and classification for A240 304H under ASME Section IX, along with its properties and applications for uses like plat stainless 304 and SA 240 GR 304 pipe. For inquiries, contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet offerings.
The P Number for A240 304H is P8, Group 1, as classified under ASME Section IX for welding procedure qualifications. P Numbers group base metals with similar weldability, mechanical properties, and base metal grouping for procedure qualification. Austenitic stainless steels like 304H are assigned P8 due to their high chromium and nickel content, ensuring compatibility in welding processes.
Group 1 within P8 includes non-stabilized austenitic grades with carbon ≤0.10%, encompassing 304H's high-carbon composition (0.04-0.10%). This classification simplifies welding qualification, allowing procedures for P8 Group 1 to apply broadly to 300-series austenitics. For low-carbon variants, see sa240 gr 304l.
See sa240 gr 304h for stock.
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 |
Carbon (0.04-0.10%) aids creep resistance. See sa240 gr 304l.
Property |
Value (Minimum) |
---|---|
Tensile Strength |
515 MPa (75 ksi) |
Yield Strength (0.2% Offset) |
205 MPa (30 ksi) |
Elongation (A5, 50 mm) |
40% |
Hardness (Brinell) |
≤ 201 HB |
Hardness (Rockwell B) |
≤ 92 HRB |
High-temperature: Allowable stress 25.5 ksi at 1000°F (538°C).
A240 304H 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.
A240 304H is used in:
For cost-effective options, see sa240 gr 201.
As of October 19, 2025, A240 304H plate prices (2B finish, 3-6mm) range from $1.60-$3.50/kg. Gangsteel offers $1.60/kg FOB (MOQ 1 ton) for sa240 gr 304h. Contact admin@gangsteel.com or visit astm a 240 stainless plate.
P8, Group 1, under ASME Section IX, for austenitic stainless steels with carbon ≤0.10%.
P8 Group 1, including non-stabilized austenitics like 304H, for procedure qualification.
Base metal group QW/QB-422 for austenitic stainless steels, requiring impact testing for low temperatures but not for high-temperature service.
P8 Group 1 simplifies qualification; use F8 fillers like ER308H for matching strength and corrosion resistance.
It groups 304H with similar weldable austenitics, ensuring compatibility for high-temperature welds in boilers.
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