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SA240 304 plate and steel represent the gold standard in austenitic stainless steel engineering, defined by the ASME SA240 specification for chromium-nickel alloys used in pressure vessels, piping, and structural components. This "18-8" grade—featuring 18% chromium and 8% nickel—delivers unparalleled corrosion resistance, formability, and cost-efficiency, making it the go-to material for industries from petrochemical refining to architectural marvels. As plates form the base stock for fabricated steel elements like flanges and beams, understanding SA240 304's dual role is vital for procurement and design. Gangsteel, China's powerhouse in stainless steel innovation, manufactures SA240 304 plates with cutting-edge electric arc furnace technology, exporting to over 80 countries. Specializing in ASME SA240 stainless steel plates, Gangsteel guarantees dual certification to ASTM A240, complete with mill test reports for seamless compliance. In this 2025 guide, we dissect specifications, real-world applications, and pricing trends to equip you with actionable intelligence for optimizing your supply chain.
SA240 304 plate and steel are rolled products with thicknesses from 0.3 mm (sheet) to 100 mm (heavy plate), widths up to 2500 mm, and lengths to 12000 mm, available in finishes like 2B, No.1, or polished for aesthetic demands. The specification mandates annealing at 1010-1120°C followed by rapid cooling to restore austenitic structure, ensuring non-magnetic properties (permeability <1.02) and cryogenic toughness to -196°C. Density at 7.93 g/cm³ enables precise weight calculations for transport and load-bearing designs. Gangsteel's SA240 Gr 304 plates undergo 100% ultrasonic testing per ASTM A435, detecting flaws <1 mm, while steel derivatives like welded pipes inherit this integrity. Compared to carbon steel, SA240 304's PREN of 18-19 offers 10x lifespan in humid atmospheres, per ASTM G150 salt spray tests.
The alloying in SA240 304 plate and steel is fine-tuned for balance, with maxima per ASME SA240:
|
Element |
Max (%) |
Typical (%) |
Engineering Benefit |
|---|---|---|---|
|
Carbon (C) |
0.08 |
0.05 |
Boosts hardness without brittleness; controlled to avert sensitization. |
|
Chromium (Cr) |
18.0–20.0 |
18.5 |
Passivates surface against rust in 5% NaCl solutions. |
|
Nickel (Ni) |
8.0–10.5 |
8.5 |
Stabilizes austenite for 50% elongation in forming. |
|
Manganese (Mn) |
2.0 |
1.0 |
Deoxidizes during melt, enhancing hot ductility. |
|
Silicon (Si) |
0.75 |
0.5 |
Improves 870°C oxidation resistance for furnace linings. |
|
Phosphorus (P) |
0.045 |
0.025 |
Limits grain boundary weakening in welds. |
|
Sulfur (S) |
0.030 |
0.015 |
Minimizes pitting sites; low levels for marine use. |
|
Nitrogen (N) |
0.10 |
0.05 |
Interstitial strengthening without cold work embrittlement. |
Gangsteel's vacuum induction melting refines these to sub-max levels, yielding PREN >19 for edge over standard 304.
SA240 304 plate and steel's mechanicals support diverse loads, with minima for annealed material:
|
Property |
Minimum |
Typical |
Design Implication |
|---|---|---|---|
|
Ultimate Tensile Strength |
515 MPa |
620 MPa |
Handles 10 bar vessels per ASME VIII Div 1. |
|
Yield Strength (0.2% Offset) |
205 MPa |
310 MPa |
Safety factor 1.5 for seismic piping. |
|
Elongation (50 mm) |
40% |
55% |
Enables 180° bends in 3mm sheet. |
|
Rockwell B Hardness |
92 max |
82 |
Polishes to Ra 0.4 μm for sanitary. |
|
Impact Toughness (Charpy V) |
100 J min |
150 J |
Survives -196°C LNG spills. |
These exceed ASTM A 959 stainless steel plates for premium variants, with Gangsteel's ESR process boosting fatigue life 25%.
SA240 304's universality shines through equivalents:
|
Standard |
Equivalent Grade |
Tolerance Edge |
Sourcing Perk |
|---|---|---|---|
|
UNS (USA) |
S30400 |
ASME-aligned. |
Code-stamped for US fabs. |
|
EN/DIN (Europe) |
1.4301 |
EN 10088 tight P/S. |
CE-marked for EU. |
|
JIS (Japan) |
SUS304 |
G4305 cold-roll focus. |
Asia cost leader. |
|
GB (China) |
0Cr18Ni9 |
GB/T 20878 local. |
Bulk domestic savings. |
|
BS (UK) |
304S31 |
BS EN post-Brexit. |
UKCA compliant. |
|
AFNOR (France) |
Z7CN18-09 |
NF wrought. |
French nuclear qual. |
|
SS (Sweden) |
2332 |
SS-EN cold variants. |
Nordic shipyards. |
Gangsteel's JIS G 4304 stainless steel plate multi-equivalents cut sourcing risks.
SA240 304 plate and steel power innovation:
|
Sector |
Deployment |
Performance Metric |
Gangsteel Impact |
|---|---|---|---|
|
Petrochemical |
Distillation columns |
25-year uptime in H2S. |
50MT for Qatar, 15% under bid. |
|
Food Processing |
Mixer bowls, conveyors |
Zero contamination per FDA. |
20MT EU, Ra 0.8 μm finish. |
|
Renewable Energy |
Solar frame brackets |
30% weight reduction vs Al. |
30MT US farm, corrosion-free. |
|
Medical Devices |
Implant trays |
Sterilizable 500 cycles. |
10MT German, ISO 13485. |
Gangsteel's ASME SA 213/SA 213M stainless pipes forge complete assemblies.
Gangsteel's nickel alloy steel plates hybridize for niches.
Gangsteel elevates SA240 304 with:
View SA240 Gr 347 for heat.
SA240 304 plate and steel fuse corrosion defiance with engineering prowess, fueling chemical tanks to skyscrapers. Specs and equivalents like EN 1.4301 cement its ubiquity, while Gangsteel's finesse—from SA240 Gr 316L for seas to SA240 Gr 904L for acids—ignites progress. Engage Gangsteel for UNS stainless steel plates and propel your vision.
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