Tonga ASTMA334 Seamless and Welded Alloy Steel Tubes for Low Temperature Service

 1. Scope* 

1.1 This specification2 covers several grades of minimumwall-thickness, seamless and welded, carbon and alloy-steel tubes intended for use at low temperatures. Some product sizes may not be available under this specification 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 system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M”designation of this specification is specified in the order. 
 

2. Referenced Documents 
2.1 ASTM Standards: 3 
A 370 Test Methods and Definitions for Mechanical Testing of Steel Products 
A 1016/A 1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes 
E 23 Test Methods for Notched Bar Impact Testing of Metallic Materials 

3. Ordering Information 
3.1 Orders for material under this specification should include the following, as required to describe the desired material adequately: 
3.1.1 Quantity (feet, metres, or number of lengths), 
3.1.2 Name of material (seamless or welded tubes), 
3.1.3 Grade (Table 1), 
3.1.4 Size (outside diameter and minimum wall thickness), 
3.1.5 Length (specific or random), 
3.1.6 Optional requirements (other temperatures, Section 14; hydrostatic or electric test, Section 16), 
3.1.7 Test report required, (Certification Section of Specification 
A 1016/A 1016M), 
3.1.8 Specification designation, and 
3.1.9 Special requirements and any supplementary requirements selected. 
 

4. General Requirements 
4.1 Material furnished under this specification shall conform to the applicable requirements of the current edition of Specification A 1016/A 1016M, unless otherwise provided herein. 
 

5. Materials and Manufacture 
5.1 The tubes shall be made by the seamless or automatic welding process with no addition of filler metal in the welding operation. 
 

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 
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 of the manufacturer, reheat to a suitable tempering temperature. 
6.1.3 For the seamless process only, reheat and control 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 of not 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 manufacturer by either of the following methods. 
6.2.1 Quenched and Tempered—Heat to a uniform temperature of 1475 6 25 °F [800 6 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 6 25 °F [900 6 15 °C]; hold at this temperature for a minimum time in the ratio of 1 h/in. [2min/mm] of thickness, but in no case less than 15 min; cool in air. Reheat until the pipe attains a uniform temperature of 1450 6 25 °F [790 6 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. [2min/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 from which impact specimens 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].

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