ASME SA240 304L Stainless Steel Plate | SA240 Type 304L

As a professional stainless steel plate supplier and China Mill-Direct Supply / Mill Direct Exporter, SHH STEEL is pleased to present ASME SA240 304L Stainless Steel Plate, also known as SA240 Type 304L.

ASME SA240 Type 304L is the low-carbon version of the classic 18-8 austenitic stainless steel. With a maximum carbon content of 0.030%, this grade provides significantly improved resistance to intergranular corrosion after welding compared with standard SA240 Type 304. It retains the excellent corrosion resistance, formability, toughness and fabricability that have made 304 the most widely used stainless steel in the world, while offering superior performance in welded constructions.

SHH STEEL supplies ASME SA240 304L as true Mill Direct Supply, sourcing directly from major Chinese stainless steel mills. This allows us to offer competitive mill pricing, consistent quality, shorter lead times and complete traceability. We provide thicknesses from 0.4 mm to 100 mm (thicker plates available on request), widths up to 2000–3000 mm, and lengths up to 12000 mm or custom cut-to-length. Both hot-rolled and cold-rolled conditions are available, together with a full range of surface finishes.

ASME SA240 304L is the preferred choice for pressure vessels, welded tanks, chemical equipment, food processing machinery and any application where the material will undergo significant welding and must maintain corrosion resistance in the as-welded condition.

Chemical composition of ASME SA240 Type 304L (Heat Analysis):

The ultra-low carbon content is the defining feature of SA240 Type 304L. By keeping carbon at or below 0.030%, the formation of chromium carbides at grain boundaries during welding or exposure to the sensitization temperature range is greatly minimized. This results in excellent resistance to intergranular corrosion in the as-welded condition without the need for post-weld annealing in most cases.

Mechanical properties of ASME SA240 Type 304L in the annealed condition:

Although the minimum tensile and yield strength values are slightly lower than those of standard Type 304, ASME SA240 304L still offers outstanding ductility, toughness and formability. The grade retains excellent impact properties at cryogenic temperatures and is widely used in low-temperature service.

Density: 7.93 g/cm³ Magnetic: Non-magnetic in the annealed condition (may become slightly magnetic after heavy cold working)

Understanding the differences between related grades helps in correct material selection:

In most welded pressure vessel and process equipment applications, ASME SA240 304L is preferred over standard 304 because it eliminates the need for post-weld solution annealing while maintaining excellent corrosion performance. When the environment contains significant chlorides or requires higher pitting resistance, upgrading to astm a240 type 316l stainless steel sheet plate is recommended. For high-temperature service, stabilized grades such as astm a240 type 321 stainless steel sheet plate or astm a240 type 347 stainless steel sheet plate are often selected.

Japanese equivalent grades frequently requested alongside ASME SA240 304L include jis g4305 sus304l steel plate and jis g4305 sus304 steel plate.

ASME SA240 304L provides excellent corrosion resistance in a wide range of atmospheric, aqueous and chemical environments. Its primary advantage over standard 304 is the markedly improved resistance to intergranular corrosion after welding or after heating in the temperature range of approximately 450–850°C.

It performs well in:

• Food processing and sanitary environments
• Oxidizing acids (e.g., nitric acid)
• Organic compounds and mild chemical solutions
• Fresh water and many industrial atmospheres

For environments containing significant chlorides or requiring higher resistance to pitting and crevice corrosion, molybdenum-bearing grades such as 316L or higher alloys should be considered.

ASME SA240 304L offers outstanding weldability by all conventional welding methods. Because of its low carbon content, it can be used in the as-welded condition in most corrosive environments without the risk of intergranular attack.

Recommended filler metals include E308L / ER308L. The grade can be readily welded to other austenitic stainless steels and to carbon steels using appropriate procedures. Post-weld heat treatment is generally unnecessary for corrosion resistance purposes.

ASME SA240 304L is supplied in the solution-annealed condition. The typical annealing temperature range is 1010–1120°C followed by rapid cooling. This treatment restores maximum corrosion resistance and ductility.

Surface Finishes

Related grades that customers frequently evaluate together with ASME SA240 304L include astm a240 type 304 stainless steel sheet plate, astm a240 type 316l stainless steel sheet plate, astm a240 type 316ti stainless steel sheet plate and jis g4305 sus304l steel plate.

ASME SA240 304L is the preferred material for a wide range of welded stainless steel equipment:

SHH STEEL is a China Mill-Direct Supply and Mill Direct Exporter of stainless steel plate. We maintain long-term cooperation with major Chinese mills and supply ASME SA240 304L with:

• Competitive mill-direct pricing
• Consistent quality and full traceability
• Complete Mill Test Certificates (EN 10204 3.1 / ASME)
• Flexible dimensions and surface finishes
• Processing services and worldwide logistics support

ASME SA240 304L Stainless Steel Plate (SA240 Type 304L) is the preferred low-carbon austenitic stainless steel for welded constructions requiring excellent corrosion resistance and freedom from intergranular attack. As a professional China Mill-Direct Supply and Mill Direct Exporter, SHH STEEL provides reliable material, competitive pricing and full technical support for this grade.

Contact SHH STEEL today for stock availability, processing options or a competitive quotation.

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