What is ASTM A276 Type 304 material?
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If you're sourcing stainless steel bars for industrial, structural, or manufacturing use, you may come across the designation ASTM A276 Type 304. But what exactly does it mean? And how does it compare to other stainless steel standards?
In this article, we'll explain the ASTM A276 standard, the chemical and mechanical properties of Type 304 stainless steel, its typical applications, and why it's one of the most widely used stainless steels globally.
Keyword Covered: ASTM A276 standard, ASTM A276 stainless steel bar specification, ASTM A276 304 round bar
What is ASTM A276?
ASTM A276 is a standard issued by ASTM International that specifies the requirements for hot-finished or cold-finished stainless steel bars (excluding rebar and forged bars). It applies to various shapes including round, square, hexagonal, and flat bars.
What is ASTM A276 Type 304?
ASTM A276 Type 304 refers to Type 304 stainless steel bar produced according to ASTM A276 standard. It is an austenitic stainless steel containing 18% chromium and 8% nickel, with excellent corrosion resistance, formability and weldability. Commonly used in structural supports, machined parts, shafts, fasteners and accessories, food processing equipment.
Chemical Composition of ASTM A276 304 round bar
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2%) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness (HRB) | ≤ 95 |
What is the yield strength of ASTM A240 Type 304?
The ASTM A276 specification covers stainless steel bars and shapes, including Type 304. The minimum yield strength for hot-finished and cold-finished Type 304 bars per ASTM A276 is 30 ksi (205 MPa). The minimum tensile strength is 75 ksi (515 MPa).
Is ASTM A276 304 the same as 304 stainless steel?
Yes, ASTM A276 304 refers to 304 stainless steel bar specifically produced under ASTM A276 specifications. It defines mechanical properties, tolerances, and manufacturing methods.
What is the difference between ASTM A276 and ASTM A182?
The main difference between ASTM A276 and ASTM A182 lies in their application and product form: ASTM A276 covers stainless steel bars and shapes in hot-finished or cold-finished condition for general structural and mechanical use, while ASTM A182 specifies forged or rolled stainless steel products (such as flanges, fittings, and valves) intended for high-temperature or pressure piping systems. In short, A276 is for structural bars, and A182 is for pressure-bearing forged components.
What is the difference between ASTM A276 and A240?
ASTM A276 is for stainless steel bars, while ASTM A240 is for plates and sheets. Both can refer to Type 304 material but in different forms.
What is AISI 304 vs ASTM A276 304?
AISI 304 is the general material grade name, while ASTM A276 304 refers to the production standard for bar form under ASTM specifications.
GNEE is a trusted supplier of ASTM A276 Type 304 stainless steel bars, offering a comprehensive range of options to meet diverse industrial needs. We provide round bars from 6mm to 300mm in diameter, with custom lengths up to 6 meters, available in cold-drawn, centerless ground, or polished finishes. All materials come with EN 10204 3.1 certification, and we offer in-house processing services including cutting, chamfering, and machining. With global shipping, competitive pricing, and full OEM support, GNEE is your reliable partner for high-quality stainless steel bar solutions.
Forms Available Under ASTM A276 Type 304
Round bar (cold-drawn or hot-rolled),Hex bar,Flat bar,Square bar,Custom cut lengths available
