ASTM A240 Type 304L Stainless Steel Sheet & Plate
What Is ASTM A240 Type 304L Stainless Steel Sheet and Plate?
As a production and export expert at SHH STEEL, we are pleased to present our ASTM A240 Type 304L Stainless Steel Sheet and Plate, also known as SS304L, UNS S30403, or SUS304L. This low-carbon version of Type 304 is specifically designed under the ASTM A240 / ASME SA240 specification to provide superior resistance to intergranular corrosion after welding.
The maximum carbon content of 0.03% in ASTM A240 304L significantly reduces the risk of carbide precipitation during welding, making it the preferred choice for welded pressure vessels, tanks, and process equipment in corrosive environments. SHH STEEL supplies ASTM A240 304L stainless steel plate and ASTM A240 304L sheet in thicknesses ranging from 0.3 mm to 100 mm, with widths up to 2500 mm and lengths up to 12000 mm. Custom sizes and dual-certified 304/304L material are also available.
Our ASTM A240 Type 304L products are typically delivered in the annealed condition with excellent formability, weldability, and corrosion resistance. All material is supplied with Mill Test Certificates (EN 10204 3.1) for complete traceability. Whether you need thin 304L stainless steel sheet for fabrication or thick 304L stainless steel plate for structural applications, SHH STEEL provides reliable quality and competitive pricing for global customers.
Material Specification of ASTM A240 Type 304L
ASTM A240 Type 304L stainless steel sheet and plate are manufactured in accordance with ASTM A240/A240M and ASME SA240. This specification covers chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and general applications. SHH STEEL offers material in annealed condition with various surface finishes including 2B, No.1, BA, and HL. Thickness ranges from 0.3 mm (sheet) to 100 mm (plate), with custom dimensions available upon request.
| Specification Element | Requirement | SHH STEEL Compliance | Keywords |
|---|---|---|---|
| Primary Standard | ASTM A240 / ASME SA240 Type 304L | Full compliance | ASTM A240 304L specification |
| Product Form | Sheet & Plate | Both available | ASTM A240 304L sheet plate |
| Thickness Range | 0.3–100 mm | Custom sizes available | ASTM A240 304L dimensions |
| Width / Length | Up to 2500 mm / 12000 mm | Custom fabrication | ASTM A240 304L size options |
| Surface Finish | 2B, No.1, BA, HL, No.4 | Multiple options | ASTM A240 304L finish |
| Heat Treatment | Annealed | Standard supply condition | ASTM A240 304L annealed |
Chemical Composition of ASTM A240 Type 304L
The chemical composition of ASTM A240 Type 304L is carefully controlled, with special emphasis on low carbon content to enhance weldability and corrosion resistance.
| Element | Content (%) | Standard Limit | Role | Keywords |
|---|---|---|---|---|
| Carbon (C) | ≤0.030 | 0.030 max | Prevents intergranular corrosion | ASTM A240 304L carbon |
| Manganese (Mn) | ≤2.00 | 2.00 max | Deoxidation and strength | ASTM A240 304L manganese |
| Phosphorus (P) | ≤0.045 | 0.045 max | Impurity control | ASTM A240 304L phosphorus |
| Sulfur (S) | ≤0.030 | 0.030 max | Cleanliness | ASTM A240 304L sulfur |
| Silicon (Si) | ≤0.75 | 0.75 max | Deoxidation | ASTM A240 304L silicon |
| Chromium (Cr) | 18.00–20.00 | 18.00–20.00 | Corrosion resistance | ASTM A240 304L chromium |
| Nickel (Ni) | 8.00–12.00 | 8.00–12.00 | Austenite stability | ASTM A240 304L nickel |
| Nitrogen (N) | ≤0.10 | 0.10 max | Strength contribution | ASTM A240 304L nitrogen |
Mechanical Properties ASTM A240 Type 304L
ASTM A240 304L in the annealed condition provides good strength combined with excellent ductility.
| Property | Value | Test Method | Keywords |
|---|---|---|---|
| Tensile Strength | ≥485 MPa (70 ksi) | ASTM A370 | ASTM A240 304L tensile |
| Yield Strength (0.2% Offset) | ≥170 MPa (25 ksi) | ASTM A370 | ASTM A240 304L yield |
| Elongation | ≥40% | ASTM A370 | ASTM A240 304L elongation |
| Hardness | ≤201 HB / ≤92 HRB | ASTM E10 / E18 | ASTM A240 304L hardness |
| Density | 8.00 g/cm³ | Standard | ASTM A240 304L density |
Delivery Conditions
SHH STEEL supplies ASTM A240 Type 304L stainless steel sheet and plate primarily in the annealed condition. Popular surface finishes include 2B, No.1, BA (Bright Annealed), and HL (Hairline). Protective PVC film can be applied for surface protection during transportation and fabrication.
| Condition | Description | Keywords |
|---|---|---|
| Annealed | Standard supply condition | ASTM A240 304L annealed |
| Surface Finish | 2B, No.1, BA, HL, No.4 | ASTM A240 304L surface |
| Protective Film | Available on request | ASTM A240 304L protection |
Tolerances
Dimensional tolerances for ASTM A240 304L sheet and plate comply with ASTM A480. Tighter tolerances are available for precision applications.
| Tolerance Type | Standard | Keywords |
|---|---|---|
| Thickness / Width / Length | ASTM A480 | ASTM A240 304L tolerance |
| Flatness | Per ASTM A480 | ASTM A240 304L flatness |
Weldability
One of the key advantages of ASTM A240 Type 304L is its excellent weldability. The low carbon content minimizes the risk of intergranular corrosion in the heat-affected zone after welding. It can be welded using common methods such as TIG, MIG, and SMAW without preheating in most cases. Matching filler metals such as ER308L are recommended. Post-weld heat treatment is generally not required.
| Weldability Factor | Recommendation | Keywords |
|---|---|---|
| Preheating | Usually not required | ASTM A240 304L welding |
| Filler Metal | ER308L | ASTM A240 304L filler |
| Post-Weld Heat Treatment | Generally not required | ASTM A240 304L PWHT |
ASTM A240 Type 304L Equivalent Material Grade
ASTM A240 Type 304L has widely recognized international equivalents, making it easy to substitute in global projects.
| Grade | Standard | Designation | Keywords |
|---|---|---|---|
| Type 304L | ASTM A240 / ASME SA240 | — | ASTM A240 304L equivalent |
| UNS S30403 | Unified Numbering System | S30403 | ASTM A240 304L UNS |
| 1.4307 | EN 10088 | X2CrNi18-9 | ASTM A240 304L EN |
| SUS304L | JIS G4304 / G4305 | — | ASTM A240 304L JIS / SUS304L |
| X2CrNi18-9 | DIN / EN | — | ASTM A240 304L DIN |
Supplementary Requirements
Additional testing available for ASTM A240 304L includes intergranular corrosion testing (ASTM A262 Practice E), ultrasonic testing, product analysis, and dual certification as 304/304L.
Applications Due to its superior weldability and corrosion resistance, ASTM A240 Type 304L stainless steel sheet and plate are widely used in the following industries:
| Application | Typical Use | Keywords |
|---|---|---|
| Chemical Processing | Welded tanks, reactors, piping | ASTM A240 304L chemical |
| Food & Beverage | Processing equipment, storage tanks | ASTM A240 304L food |
| Pharmaceutical | Clean equipment and vessels | ASTM A240 304L pharma |
| Pressure Vessels | Welded pressure-containing equipment | ASTM A240 304L vessel |
| Architectural & Industrial | Structural and decorative applications | ASTM A240 304L architecture |
Why Choose SHH STEEL
SHH STEEL is a professional supplier of ASTM A240 Type 304L stainless steel sheet and plate. We offer competitive pricing, flexible custom sizes, multiple surface finishes, and reliable worldwide delivery. All material is supplied with full Mill Test Certificates and can be dual-certified 304/304L when required.
Advantage | Benefit | Keywords —|—|—|— Full Certification | ASTM A240 / ASME SA240 + MTC 3.1 | ASTM A240 304L certified Flexible Supply | Sheet & Plate, custom sizes | ASTM A240 304L custom Global Experience | Export to 50+ countries | ASTM A240 304L trusted supplier
FAQ: Common Questions About ASTM A516 GR 70 Steel Plate
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What is the main difference between ASTM A240 304 and ASTM A240 304L?
- The primary difference is carbon content. ASTM A240 Type 304L has a maximum carbon content of 0.03%, while Type 304 allows up to 0.08%. The lower carbon in 304L provides better resistance to intergranular corrosion after welding.
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Is ASTM A240 304L the same as SS304L or SUS304L?
- Yes. ASTM A240 Type 304L, SS304L, SUS304L, and UNS S30403 all refer to the same low-carbon austenitic stainless steel grade.
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When should I choose ASTM A240 304L instead of 304?
- Choose ASTM A240 304L when the material will be welded and used in corrosive environments, or when intergranular corrosion resistance after welding is critical.
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Can you supply dual-certified ASTM A240 304/304L material?
- Yes. SHH STEEL regularly supplies dual-certified 304/304L material that meets the requirements of both grades.
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What is the density of ASTM A240 Type 304L?
- The density of ASTM A240 Type 304L is 7.93 g/cm³.
Conclusion
SHH STEEL’s ASTM A240 Type 304L Stainless Steel Sheet and Plate provide excellent corrosion resistance, superior weldability, and reliable performance for demanding welded applications. With strict quality control, flexible sizing options, and professional global export service, we deliver high-quality 304L stainless steel plate and 304L stainless steel sheet solutions to customers worldwide. Contact SHH STEEL today for your ASTM A240 304L requirements.
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