ASTM A240 304 Cold Rolled Stainless Steel Coil 2B Finish 0.3–6mm For Industrial Use
Product Details
ASTM A240 304 stainless steel coil
,cold rolled stainless steel coil 2B finish
,industrial stainless steel sheet 0.3–6mm
| Specification | Details |
|---|---|
| Product | 304 Cold Rolled Stainless Steel Coil |
| Grade | 304 |
| UNS No. | S30400 |
| Standard | ASTM A240 / ASME SA240 |
| Material Type | Austenitic Stainless Steel |
| Manufacturing Process | Cold Rolled |
| Thickness | 0.3–6.0 mm |
| Width | 1000–2000 mm, customized |
| Surface Finish | 2B |
| Surface Treatment | Cold Rolled, Annealed & Pickled, Skin Passed |
| Edge | Mill Edge (No. 1) / Slit Edge (No. 4), as required |
| Coil ID | Commonly 508 mm or 610 mm, customizable |
| Coil Weight | Customized according to customer requirements |
| Delivery Condition | Annealed and Pickled / 2B |
| Shape | Coil / Strip |
| Tolerance | According to ASTM A480/A480M or customer requirements |
| Processing | Slitting, Cutting, Leveling, Bending, Stamping, Welding |
ASTM A240 304 cold-rolled stainless steel coils refer to 18-8 austenitic stainless steel that complies with the American Society for Testing and Materials (ASTM) A240/A240M standard. These coils are produced through cold rolling and are suitable for applications requiring corrosion resistance and mechanical properties, such as pressure vessels, construction, food processing, and chemical equipment.
Standard and ScopeASTM A240/A240M is a general-purpose standard for chromium (Cr) and chromium-nickel (Cr-Ni) stainless steel plates, sheets, and strips, covering pressure vessels and general-purpose applications.
A240: Imperial units
A240M: Metric units
This standard specifies the chemical composition, mechanical properties, dimensional tolerances, surface conditions, heat treatment requirements, and testing and certification methods for the material, ensuring consistent performance during machining, welding, and service.
Chemical Composition (Typical Range):
The typical chemical composition of ASTM A240 304 Stainless Steel is shown below:
Carbon (C): ≤0.07% (304) or ≤0.03% (304L)
Chromium (Cr): 17.50–19.50%
Nickel (Ni): 8.00–10.50%
Molybdenum (Mo): 0% (distinguishing it from 316)
| Element | Composition (wt. %) |
|---|---|
| Carbon (C) | ≤ 0.07 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.5–19.5 |
| Nickel (Ni) | 8.0–10.5 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical Values):
The typical mechanical properties of ASTM A240 304 Cold Rolled Stainless Steel Coil are as follows:
Tensile Strength: Approximately 75 ksi (515 MPa)
Yield Strength: Approximately 30 ksi (207 MPa)
Elongation: ≥40%
Hardness: Approximately 201 HBW
| Property | Typical Value |
|---|---|
| Tensile Strength, min. | 515 MPa |
| Yield Strength (0.2% Offset), min. | 207 MPa |
| Elongation in 50 mm, min. | 40% |
| Hardness, max. | 201 HB |
| Rockwell Hardness, max. | B92 |
| Modulus of Elasticity | ~193 GPa |
| Density | ~7.93 g/cm³ |
Characteristics of the Cold Rolling Process
Cold rolling is a process performed at temperatures below the recrystallization temperature of the material. It improves surface finish, dimensional accuracy, and strength, but reduces ductility.
Common surface finishes include: 2B (cold-rolled, annealed, pickled, and finished), BA (bright annealed), No. 1 (annealed, pickled), etc.
Cold-rolled coils are suitable for subsequent processing such as stamping, deep drawing, and welding, and offer superior surface quality compared to hot-rolled materials.
Typical Applications
Construction and Finishing: Curtain walls, railings, interior structures
Food Processing: Equipment housings, containers, workbenches
Chemical Processing and Pressure Vessels: Piping and storage tanks in non-highly corrosive environments
Automotive and Home Appliances: Trim parts, component housings
1. What is ASTM A240 304 Cold Rolled Stainless Steel Coil?
ASTM A240 304 Cold Rolled Stainless Steel Coil is an austenitic stainless steel coil made from Grade 304 stainless steel and processed through cold rolling. It offers good corrosion resistance, strength, formability, weldability, and a smooth 2B surface finish, making it suitable for a wide range of industrial applications.
2. What is the chemical composition of 304 stainless steel?
304 stainless steel typically contains approximately 17.5–19.5% chromium and 8.0–10.5% nickel, with carbon limited to 0.07% maximum under commonly specified ASTM A240 requirements. Iron makes up the balance.
3. What thicknesses are available for 304 cold rolled stainless steel coil?
Our 304 cold rolled stainless steel coils can be supplied in thicknesses from 0.3 to 6.0 mm, subject to production capability and applicable dimensional tolerances. Custom thicknesses can be discussed according to project requirements.
4. What does 2B finish mean on stainless steel coil?
2B finish is a smooth cold-rolled stainless steel surface produced through cold rolling, heat treatment, pickling, and a final light pass. It provides a uniform, smooth appearance and is one of the most widely used finishes for 304 stainless steel coil.
5. Is 304 stainless steel coil corrosion resistant?
Yes. 304 stainless steel provides good general corrosion resistance in many atmospheric and industrial environments. However, the appropriate grade should be selected based on the specific chemical environment, temperature, chloride exposure, and service conditions.
6. Can 304 cold rolled stainless steel coil be welded?
Yes. 304 stainless steel has good weldability and can be welded using common stainless steel welding processes, including TIG, MIG, and resistance welding. For demanding applications, welding procedures should be selected according to the material thickness and service requirements.
7. Can 304 cold rolled stainless steel coil be stamped or deep drawn?
Yes. 304 has good formability and can be used for stamping, bending, forming, and deep drawing. The specific cold-rolled condition and thickness should be considered when designing highly formed components.
8. What widths are available?
The coil can be supplied in standard or customized widths, depending on production requirements. Slitting can also be provided to produce narrower stainless steel strips for specific applications.
9. What is the difference between 304 cold rolled and hot rolled stainless steel?
The primary difference is the manufacturing process and resulting surface and dimensional characteristics. Cold rolled 304 stainless steel generally provides better surface quality, tighter dimensional control, and higher strength than hot rolled material, while hot rolled material is commonly selected for thicker sections and applications where surface appearance and tight dimensional tolerances are less critical.
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