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ASTM A276 vs ASTM A479 – What’s the Difference

ASTM A276 vs ASTM A479

When selecting the suitable material for your project, it’s crucial to clearly understand the different standards and specifications. ASTM A276 and ASTM A479 are widely used specifications for stainless steel bars, forgings, and shapes. However, both specifications have subtle differences that could significantly impact your project’s success. In this blog post, we’ll look closer at ASTM A276 vs ASTM A479 and help you make an informed decision.

Difference Between ASTM A276 and ASTM A479

ASTM A276 and ASTM A479 are both standard specifications for stainless steel materials. ASTM A276 is a standard specification that covers stainless steel bars, including round bars, square bars, and hex bars, while ASTM A479 is a specification that covers hot and cold-finished bars and shapes. Both specifications cover various grades of stainless steel, including 304, 316, 410, and 416.

Composition and Chemical Properties

One of the main differences between ASTM A276 and ASTM A479 lies in their chemical compositions. ASTM A276 specifies that the material should have a maximum of 0.08% carbon, whereas ASTM A479 allows for a slightly higher carbon content of up to 0.15%. The chemical composition of the material can impact its performance properties, such as its corrosion resistance, toughness, and ductility.

Mechanical Properties

The mechanical property requirements are another significant difference between ASTM A276 and ASTM A479. ASTM A276 specifies that the material should meet specific automated tests such as yield strength, tensile strength, and elongation. In contrast, ASTM A479 stipulates that the material should meet only minimum yield and tensile strengths. This means that materials meeting the ASTM A276 specification will typically exhibit superior mechanical properties compared to materials meeting the ASTM A479 specification.

Applications

The choice between ASTM A276 and ASTM A479 largely depends on the application requirements. ASTM A276 is typically used in applications requiring higher mechanical properties or tighter chemical composition tolerances, such as pump shafts, valve components, and bolts. ASTM A479 is commonly used for less critical or more general-purpose applications such as fasteners, machining components, and structural parts.

Cost and Availability

Regarding cost and availability, ASTM A276 and ASTM A479 materials are generally similar. However, there may be differences in pricing depending on the availability and the specific application requirements. Working with a reputable supplier who can provide you with the best quality materials according to your project requirements is essential.

Conclusion

In conclusion, understanding the differences between ASTM A276 and ASTM A479 is essential for selecting suitable materials for your project. While both specifications cover various grades and types of stainless steel, they have subtle differences, such as chemical composition and mechanical properties, that can significantly affect their suitability for different applications. Considering these differences, you can choose the correct specification for your project and ensure your materials perform as expected.

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