What is ASTM A479 material?

What is ASTM A479 material?

ASTM A479 is a standard specification that covers stainless steel bars and shapes, including rounds, squares, and hexagons, for use in the construction of boilers and pressure vessels. These materials are available in hot-finished and cold-finished forms and can be manufactured from various stainless steel alloys, such as austenitic, duplex, and super duplex grades, meeting specific chemical and mechanical property requirements.

 

ASTM A479 covers numerous grades of stainless steel for bars and shapes used in boilers and pressure vessels, including austenitic (e.g., 304, 304L, 316, 316L, 904L), austenitic-ferritic (duplex), ferritic (e.g., 430, 444), and martensitic (e.g., 410, 431) grades, providing various options with different mechanical properties and corrosion resistance for specialized applications.

 

What is the chemical composition of ASTM A479 ?

ASTM A479 is a material specification for stainless steel bars and shapes used in boilers and pressure vessels, not a single chemical composition itself. Therefore, the specific chemical composition depends on the specific alloy grade covered by A479, which can include widely used grades like Type 304, Type 316, Duplex S31803, or XM-19. Each of these alloys has its own distinct range of percentages for elements like carbon, chromium, nickel, molybdenum, and nitrogen.

What are the mechanical properties of ASTM A479?

ASTM A479 specifies mechanical properties like tensile strength, yield strength, and elongation for various grades of stainless steel, including 304/304L, 316/316L, 310, and 347. For example, ASTM A479 Type 304 typically exhibits a minimum tensile strength of 515 MPa (75 ksi) and a minimum elongation of 40% in 50mm.

 

 

What is the difference between ASTM A182 and ASTM A479?
Duplex Steel A182 F51 Bolts are known for their higher strength compared to most stainless steel grades and exhibit better resistance to stress corrosion cracking. Also, A182 is the ASTM standard for flanges whereas A479 is for heat treated bars, wire, forgings and cold finishes.

 

What is the difference between ASTM A276 and A479?

ASTM A276 and ASTM A479 are both specifications for stainless steel bars, but they differ in their intended applications. A276 covers general-purpose stainless steel bars, while A479 specifically addresses bars for use in boilers and pressure vessels. A479 bars are designed to withstand higher temperatures and pressures and are often used in more critical applications.

 

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