Astm A479 39.pdfl ((EXCLUSIVE))
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What is Astm A479 39.pdfl and why is it important for boiler and pressure vessel construction
Astm A479 39.pdfl is a PDF file that contains the standard specification for stainless steel bars and shapes for use in boilers and other pressure vessels. This specification covers hot- and cold-finished bars of stainless steel, including rounds, squares, and hexagons, and hot-rolled or extruded shapes such as angles, tees, and channels. The specification also defines the heat treatment, mechanical testing, and chemical composition requirements for different grades of stainless steel.
Stainless steel bars and shapes are widely used in boiler and pressure vessel construction because they offer high strength, corrosion resistance, and durability. They can withstand high temperatures, pressures, and stresses without cracking or failing. They can also resist oxidation, scaling, and intergranular attack in various environments. The Astm A479 39.pdfl specification ensures that the stainless steel bars and shapes meet the quality and performance standards for safe and reliable operation of boilers and pressure vessels.
The Astm A479 39.pdfl specification was developed by ASTM International, a global organization that develops and publishes voluntary consensus standards for materials, products, systems, and services. The specification was approved by ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and Subcommittee A01.17 on Flat-Rolled and Wrought Stainless Steel. The specification is also used by ASME Boiler and Pressure Vessel Code applications as SA-479/SA-479M in Section II of that Code.
The Astm A479 39.pdfl specification is available for download from the ASTM website at https://www.modiranahan.com/uploads/pdf/ASTM-A479-2019a.pdf. The PDF file contains 16 pages of detailed information on the scope, referenced documents, ordering information, general requirements, heat treatment, chemical composition, mechanical properties, general conditions for delivery, product analysis, permissible variations in dimensions, certification, product marking, keywords, supplementary requirements, annexes, tables, figures, notes, references, and footnotes of the specification.
The Astm A479 39.pdfl specification covers different grades of stainless steel, such as austenitic, austenitic-ferritic (duplex), ferritic, and martensitic. Each grade has its own characteristics and applications depending on the chemical composition, microstructure, and mechanical properties. For example, austenitic stainless steels have high corrosion resistance and ductility, but low strength and hardness. They are suitable for cryogenic to high-temperature applications. Duplex stainless steels have a balanced microstructure of austenite and ferrite, which gives them high strength and corrosion resistance, but also high susceptibility to stress corrosion cracking. They are suitable for moderate to high-temperature applications.
The Astm A479 39.pdfl specification also specifies the heat treatment for each grade of stainless steel. Heat treatment is a process of heating and cooling the metal to alter its structure and properties. Heat treatment can improve the strength, hardness, toughness, ductility, corrosion resistance, and wear resistance of stainless steel. The specification defines the minimum annealing temperature, cooling rate, and holding time for each grade. Annealing is a heat treatment that softens the metal and relieves internal stresses. It also dissolves carbides that can cause intergranular corrosion in austenitic stainless steels.
The Astm A479 39.pdfl specification also defines the mechanical testing requirements for each grade of stainless steel. Mechanical testing is a process of applying force or deformation to the metal to measure its response and behavior. Mechanical testing can evaluate the tensile strength, yield strength, elongation, reduction of area, hardness, impact toughness, and fatigue strength of stainless steel. These properties indicate the ability of the metal to resist fracture, deformation, wear, and fatigue under various loading conditions. The specification also provides the test methods and equipment for conducting the mechanical tests. aa16f39245