1.4301 vs ASME SA240 304L Stainless Steel Plate

SA-240 304 vs SA-240 304L: Key Differences in Composition, Properties, and Applications

Introduction to SA-240 304 vs SA-240 304L

SA-240 304 and SA-240 304L are both austenitic stainless steel grades under the ASME SA-240 specification for chromium-nickel stainless steel plates, sheets, and strips used in pressure vessels and general applications. While they share similar base compositions, the primary distinction lies in carbon content, which impacts weldability and corrosion resistance. SA-240 304 is a standard grade for general use, whereas SA-240 304L is the low-carbon variant designed to minimize carbide precipitation during welding. This comparison is essential for engineers selecting materials for corrosive or high-temperature environments. Gangsteel, a top manufacturer and exporter in China, produces both grades with precision. As specialists in ASME SA 240 stainless steel plate, Gangsteel offers certified products for global projects. This article details the differences between SA-240 304 and SA-240 304L, including composition, properties, and uses.

What is SA-240 304 Stainless Steel?

SA-240 304 is the standard grade of Type 304 stainless steel in the ASME SA-240 specification, known for its excellent corrosion resistance and strength. It is widely used in applications requiring durability in mildly corrosive environments, such as food processing equipment and architectural structures. Equivalent to UNS S30400, EN 1.4301, and JIS SUS304, it is non-magnetic and has good formability. Gangsteel’s SA240 Gr 304 meets ASTM A240 stainless plate standards, making it ideal for general fabrication.

What is SA-240 304L Stainless Steel?

SA-240 304L is the low-carbon version of Type 304L stainless steel in the ASME SA-240 specification, with carbon limited to 0.03% to prevent intergranular corrosion after welding. It is preferred for welded structures in corrosive settings, like chemical tanks and piping. Equivalent to UNS S30403, EN 1.4307, and JIS SUS304L, it maintains similar strength but offers better weldability. Gangsteel’s SA240 Gr 304L is optimized for JIS G 4304 stainless steel plate compliance.

Chemical Composition Comparison

The main difference is carbon content, affecting corrosion after welding. The table below shows compositions per ASME SA-240:

Gangsteel ensures low impurities in both for enhanced performance.

Mechanical Properties Comparison

Mechanical properties are similar, but 304 has slightly higher strength. The table below summarizes as per ASME SA-240:

These make 304 suitable for general use, 304L for welds.

Corrosion Resistance: SA-240 304 vs SA-240 304L

Both have good corrosion resistance (PREN ~19), but SA-240 304L is better in welded areas, resisting intergranular corrosion per ASTM A262. SA-240 304 may require annealing after welding. Gangsteel’s low-sulfur versions enhance pitting resistance for both.

Weldability and Formability

SA-240 304L excels in weldability, avoiding carbide formation without annealing. SA-240 304 is weldable but risks corrosion in HAZ without treatment. Both have excellent formability. Gangsteel recommends 304L for multi-pass welds.

Applications of SA-240 304 and SA-240 304L

The table below highlights applications:

Gangsteel’s ASME SA 213/SA 213M stainless pipes pair with both grades.

Comparing SA-240 304 and SA-240 304L with Other Grades

SA-240 304 vs 316: SA-240 304 is cost-effective for general corrosion, while 316 has molybdenum for chloride resistance.

SA-240 304L vs 316L: SA-240 304L for mild corrosives, 316L for harsher environments.

SA-240 304 vs 201: SA-240 304 has better corrosion due to nickel, 201 is cheaper but less durable.

SA-240 304 vs 430: SA-240 304 is non-magnetic with better formability, 430 is magnetic and cheaper for mild use.

Gangsteel’s nickel alloy steel plates offer advanced options.

Why Choose Gangsteel for SA-240 304 and SA-240 304L?

Gangsteel provides both grades with:

• Quality Assurance: Compliant with ASME SA240 and ASTM A240.
• Customization: Various sizes and finishes.
• Export Excellence: Worldwide delivery.
• Variety: Including SA240 Gr 347 and SA240 Gr 201L.

Conclusion

SA-240 304 and SA-240 304L provide strength and corrosion resistance for various applications, with 304L better for welding. Supported by equivalents like EN 1.4301. Gangsteel’s solutions in China, including SA240 Gr 316L and SA240 Gr 904L, ensure quality. Contact Gangsteel for UNS stainless steel plates to meet your needs.