ASME SA-334-SA-334M:2021 pdf download

ASME SA-334-SA-334M:2021 pdf download.SPECIFICATION FOR SEAMLESS AND WELDED CARBON AND ALLOY-STEEL TUBES FOR LOW- TEMPERATURE SERVICE
1. Scope
1.1 This specification covers several grades of mini- mum-wall-thickness, seamless and welded, carbon and alloy-steel tubes intended for use at low temperatures. Some product sizes may not be available under this speci- fication because heavier wall thicknesses have an adverse affect on low-temperature impact properties. 1.2 Supplementary Requirement S1 of an optional nature is provided. This shall apply only when specified by the purchaser. NOTE 1 — For tubing smaller than 1 ⁄ 2 in. [12.7 mm] in outside diameter, the elongation values given for strip specimens in Table 1 shall apply. Mechanical property requirements do not apply to tubing smaller than 1 ⁄ 8 in. [3.2 mm] in outside diameter and with a wall thickness under 0.015 in. [0.4 mm]. 1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each systemmustbeusedindependentlyoftheother. Combining values fromthe two systems may resultin nonconformance with the specification. The inch-pound units shall apply unless the “M” designation ofthis specification is specified in the order.
6. Heat Treatment
6.1 All seamless and welded tubes, other than Grades 8 and 11, shall be treated to control their microstructure in accordance with one of the following methods: 6.1.1 Normalize by heating to a uniform temperature of not less than 1550°F [845°C] and cool in air or in the cooling chamber of an atmosphere controlled furnace. 6.1.2 Normalize as in 10.1.1, and, at the discretion ofthe manufacturer, reheat to a suitable tempering temper- ature. 6.1.3 For the seamless process only, reheat and con- trol hot working and the temperature of the hot-finishing operation to a finishing temperature range from 1550 to 1750°F [845 to 955°C] and cool in a controlled atmosphere furnace from an initial temperature ofnot less than 1550°F [845°C]. 6.1.4 Treat as in 6.1.3 and, at the discretion of the manufacturer, reheat to a suitable tempering temperature. 6.2 Grade 8 tubes shall be heat treated by the manufac- turer by either of the following methods. 6.2.1 Quenched and Tempered — Heat to a uniform temperature of 1475 ± 25°F [800 ± 15°C]; hold at this temperature for a minimum time in the ratio of 1 h/in. [2 min/mm] of thickness, but in no case less than 15 min; quench by immersion in circulating water. Reheat until the pipe attains a uniform temperature within the range from 1050 to 1125°F [565 to 605°C]; hold at this temperature for a minimum time in the ratio of 1 h/in. [2 min/mm] of thickness, but in no case less than 15 min; cool in air or water quench at a rate no less than 300°F [165°C]/h.6.2.2 Double Normalized and Tempered — Heat to a uniform temperature of 1650 ± 25°F [900 ± 15°C]; hold at this temperature for a minimum time in the ratio of 1 h/in. [2 min/mm] of thickness, but in no case less than 15 min; cool in air. Reheat until the pipe attains a uniform temperature of 1450 ± 25°F [790 ± 15°C]; hold at this temperature for a minimum time in the ratio of 1 h/in. [2 min/mm] of thickness, but in no case less than 15 min; cool in air. Reheat to a uniform temperature within the range from 1050 to 1125°F [565 to 605°C]; hold at this temperature for a minimum time of 1 h/in. [2 min/mm] of thickness but in no case less than 15 min; cool in air or water quench at a rate not less than 300°F [165°C]/h. 6.3 Material fromwhichimpactspecimens are obtained shall be in the same condition of heat treatment as the finished tubes. 6.4 Whether to anneal Grade 11 tubes is per agreement between purchaser and supplier. When Grade 11 tubes are annealed they shall be normalized in the range of 1400 to 1600°F [760 to 870°C].