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ASTM A479-2018 pdf free download

ASTM A479-2018 pdf free download.Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
1. Scope
1.1 This specification 2 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 for use in boiler and pressure vessel construction. 2 N OTE 1—There are standards covering high nickel, chromium, auste- nitic corrosion, and heat-resisting alloy materials. These standards are under the jurisdiction ofASTM Subcommittee B02.07 and may be found in Annual Book ofASTM Standards, Vol 02.04. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.3 Unless the order specifies the applicable “M” specifica- tion designation, the material shall be furnished to the inch- pound units. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
5. Chemical Composition
5.1 Chemical composition shall be reported to the purchaser, or his representative, and shall conform to the requirements specified in Table 1. 5.2 When a product analysis is performed or requested by the purchaser, the tolerance limits as described in Specification A484/A484M apply unless Supplementary Requirement S3 is invoked. 5.3 Methods and practices relating to chemical analysis required by this specification shall be in accordance with Test Methods, Practices, and Terminology A751.
6. Grain Size for Austenitic Grades
6.1 All austenitic grades shall be tested for average grain size by Test Methods E112. 6.2 The H grades shall conform to an average grain size as follows: 6.2.1 ASTM No. 6 or coarser for Types 304H, 309H, 310H, and 316H, 6.2.2 ASTM No. 7 or coarser for Types 321H, 347H, and 348H. 6.3 For S32615, the grain size as determined in accordance with Test Methods E112, comparison method, Plate 11, shall be No. 3 or finer. 6.4 For N08810 and N08811, the average grain size as determined in accordance with Test Methods E112 shall be No. 5 or coarser. 6.5 Supplementary Requirement S1 shall be invoked when non–H grade austenitic stainless steels are ordered for ASME Code applications for service above 1000°F [540°C].
7. Mechanical Properties Requirements
7.1 The material shall conform to the mechanical property requirements specified in Table 2 for the grade ordered. At least one room-temperature test shall be performed by the manufac- turer on a sample from at least one bar or shape from each lot of material. 7.2 The yield strength shall be determined by the offset (0.2 %) method as prescribed in Test Methods and Definitions A370. 7.3 Martensitic material supplied in the annealed condition shall be capable of meeting the hardened and tempered mechanical properties when heat treated. 7.4 Hardness measurements, when required, shall be made at a location midway between the surface and the center of the cross section.
8. Testing for Intermetallic Compounds
8.1 When specified by the purchaser in the purchase order, the manufacturer shall test the austenitic or austenitic-ferritic (duplex) stainless steel material in its final condition in accordance with supplementary test requirements S6. N OTE 2—Many, if not all, duplex stainless steels and some austenitic stainless steels will form intermetallic phases or compounds such as sigma, chi, and laves phases when exposed to temperatures below the specified annealing temperature or cooled slowly from a higher tempera- ture during casting, welding, or annealing. These phases can have a negative effect on mechanical properties and corrosion resistance. These phases can typically be removed by correct annealing and cooling practices. The presence of these phases can be demonstrated by tests, typically involving metallography, impact toughness, or corrosion resistance, although the testing requirements may be different for different alloy grades. Such testing may or may not be routinely performed by the manufacturer.

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