Type 304 Sheets
About Type 304 Sheets
Type 304 stainless steel sheet provides excellent corrosion resistance and high ductility. Conforming to ASTM A240, it is ideal for food processing equipment and architectural trim. In-stock with custom cutting available.
Quick Facts
- Material: 304 Stainless Steel
- ASTM Standard: A240
- Available Sizes: 10, 11, 12 gauge
- Finishes: 2-B Mill, #4 Brushed
- Location: Los Angeles warehouse
- Services: Custom size, same-day pickup
Overview
Type 304 is the most widely used austenitic stainless steel, also known as 18-8 for its nominal composition of 18% chromium and 8% nickel. This composition provides excellent resistance to a wide range of atmospheric and corrosive environments. It is non-magnetic in the annealed condition and cannot be hardened by heat treatment, but its strength can be increased through cold working. Its combination of properties makes it a versatile choice.
As a sheet product, 304 stainless steel offers exceptional formability, making it suitable for deep drawing and bending operations. It is available in several finishes, including the standard dull 2-B mill finish and the popular #4 brushed finish for aesthetic applications. Its excellent weldability by all common fusion techniques allows for complex fabrications, from kitchen sinks to architectural panels, without requiring pre- or post-heating for most sections.
Technical Specifications
Mechanical Properties
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 73,200 | PSI |
| Yield Strength | 31,200 | PSI |
| Elongation | 70 | % |
| Hardness | 123 | HB |
Applicable Standards
- ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
Common Applications
- Food & Beverage: Countertops, sinks, and processing equipment - for its hygienic, non-reactive surface.
- Architecture: Wall panels, column covers, decorative trim, and roofing - for its clean appearance and weather resistance.
- Automotive: Exhaust components, trim, and wheel covers - for heat and corrosion resistance.
- Medical: Surgical instruments, medical carts, and sterilization trays - due to its sterilizability and corrosion resistance.
- Kitchenware: Cookware, flatware, and appliances - for durability and food-safe properties.
- Chemical Processing: Storage tanks, piping, and vessels - for its resistance to a wide range of chemicals.
- HVAC: Ductwork, furnace parts, and filter frames - for its durability and resistance to moisture.
Working with Type 304 Sheets
Machining
Type 304 has fair machinability. Its tendency to work-harden requires the use of sharp tooling, slow speeds, and heavy, continuous feeds to prevent glazing. Chip breakers are recommended as the chips can be stringy and tough.
Welding
Excellent weldability with all standard fusion methods, both with and without filler metals. AWS E/ER308 or 308L filler rods are commonly used. For maximum corrosion resistance, a post-weld anneal is recommended to redissolve any chromium carbide precipitation.
Finishing
304 stainless steel can be mechanically polished to a variety of finishes, including the common #4 brushed finish and a highly reflective #8 mirror finish. It is also suitable for chemical coloring and passivation to enhance corrosion resistance.
Related Products
Frequently Asked Questions
Q: What is the difference between 304 and 304L stainless steel?
A: 304L has a lower carbon content (0.03% max vs 0.08% max for 304) to minimize carbide precipitation during welding. This improves corrosion resistance in the heat-affected zone of the weld, making 304L a better choice for heavy-gauge welded components.
Q: Is 304 stainless steel magnetic?
A: In its annealed, austenitic state, 304 is non-magnetic. However, it can become slightly magnetic after cold working processes like bending, forming, or drawing due to the formation of martensite in the microstructure.
Q: When should I use 316 instead of 304 stainless steel sheet?
A: Use 316 stainless steel for applications with significant exposure to chlorides (such as salt water, de-icing salts) or more aggressive chemical environments. The added molybdenum in 316 provides superior resistance to pitting and crevice corrosion compared to 304.
Stock & Custom Sizes
Available thicknesses: 10 gauge (0.135"), 11 gauge, 12 gauge (0.105"). Standard sheets available in 4x8 ft and 4x10 ft. Custom size available.
Same-day cutting and Los Angeles pickup available.
View Sizes & PricingNeed Type 304 Sheets? Contact Bobco Metals for availability and Los Angeles pickup.
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