ASTM A953 Austenitic Chromium Nickel Silicon Alloy Steel Seamless and Welded Tubing

1. Scope 
1.1 This specification covers grades of nominal-wallthickness,austenitic alloy steel tubing for general corrosionresisting and low- or high-temperature service, having a specified minimum chromium content of less than 10.50 %. 
1.2 The tubing sizes and thicknesses usually furnished to this specification are 1⁄4 in. (6.4 mm) in inside diameter and larger and 0.020 in. (0.51 mm) in nominal wall-thickness and heavier. 
1.3 Mechanical property requirements do not apply totubing smaller than 1⁄8 in. (3.2 mm) in inside diameter or 0.015 in. (0.38 mm) in thickness. 
1.4 Some steels covered by this specification, especially the high silicon containing steels, because of their particular alloy content and specialized properties, may require special care in their fabrication and welding. Specific procedures are of fundamental importance, and it is presupposed that all parameters will be in accordance with approved methods capable of producing the desired properties in the finished fabrication. 
1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. 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. Unless the order specifies the applicabl“M” specification designation (SI units), the material shall be furnished in inch-pound units. 
 

2. Referenced Documents 
2.1 ASTM Standards: 
A 370 Test Methods and Definitions for Mechanical Testing of Steel Products2 
A 480/A 480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip2 
A 632 Specification for Seamless and Welded Austenitic Stainless Steel Tubing (Small-Diameter) for General Service3 
A 1016/A 1016M Specification for General Requirements for Ferritic Alloy Steels, Austenitic and Stainless Steel Tubes3 
2.2 ANSI Standard: 
B 31.3 Chemical Plant and Petroleum Refinery Piping4 
2.3 ASME Pressure Vessel Code: Section VIII Division 1, Pressure Vessels5 

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 nominal wall thickness), 
3.1.5 Length (specific or random), 
3.1.6 Test report required (see Section on Inspection of Specification A 1016/A 1016M), 
3.1.7 Specification designation, and 
3.1.8 Special requirements. 
 

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. Manufacture 
5.1 The tubes shall be made by the seamless or welded process. 
5.2 At the manufacturer's option, tubing may be furnished either hot finished or cold finished. 
 

6. Heat Treatment 
6.1 All material shall be furnished in the heat-treated condition. Except as provided in 6.2, the heat-treatment procedure shall, consist of heating the material to a minimum temperature of 1900°F (1040°C) and quenching in water or rapidly cooling by other means. 
6.2 Controlled structural or special service characteristics shall be specified as a guide for the most suitable heat treatment. If the final heat treatment is at a temperature under 
1900°F and is so specified on the order, each tube shall be stenciled with the final heat treatment temperature in degrees Fahrenheit after the suffix “HT.”
6.3 S70003 shall be heat treated in the range 1920°F(1050°C) minimum to 2010°F (1100°C) maximum followed by a water quench or rapid cooling by other means. 
 

9. Mechanical Tests Required 
9.1 Flaring Test (Seamless Tubes)—One test shall be made on specimens from one end of one tube from each lot (see Note1) of finished tubes. 
NOTE 1—The term lot applies to all tubes prior to cutting to length of the same nominal size and wall thickness which are produced from the same heat of steel. When final heat treatment is in a batch-type furnace, a heat-treatment lot shall include only those tubes of the same size and from 
the same heat that are heat treated in the same furnace charge. When the final heat treatment is in a continuous furnace, the number of tubes of the same size and from the same heat in a heat-treatment lot shall be determined from the size of the tubes as prescribed in Table 2. 
9.2 Flange Test (Welded Tubes)—One test shall be made on specimens from one end of one tube from each lot (see Note 1) of finished tubes. 
9.3 Hardness Test—Brinell or Rockwell hardness determination shall be made on specimens from two tubes from each lot. The term lot applies to all tubes prior to cutting, of the same nominal diameter and wall thickness that are produced from the same heat of steel. When final heat treatment is in a batch-type furnace, a lot shall include only those tubes of the same size and the same heat which are heat treated in the same furnace charge. When the final heat treatment is in a continuous furnace, a lot shall include all tubes of the same size and heat, heat treated in the same furnace at the same temperature, time at heat, and furnace speed. 
9.4 When more than one heat is involved, the flaring,flanging, and hardness test requirements shall apply to each heat. 
9.5 Reverse Flattening Test—For welded tubes, one reverse flattening test shall be made on a specimen from each 1500 ft(460 m) of finished tubing. Coiled tubing greater than 1500 ft(450 m) in length shall be sampled at both ends. A coil must be continuous without any circumferential butt welds. 
9.6 Hydrostatic or Nondestructive Electric Test—Each tube, seamless or welded, shall be subjected to the Nondestructive Electric Test or the Hydrostatic Test. Unless specified by the purchaser, either test may be used at the option of the producer. 

10. Hardness Requirements 
10.1 S70003 shall have a maximum hardness of 220 HV or 95 HRB in the annealed condition. 
10.2 For tubing less than 0.065 in. (1.65 mm) in wall thickness, it is permissible to use the Rockwell superficial hardness test or the Vickers hardness test. The superficial hardness number for S70003 shall not exceed 79 on the 30 T scale or 91 on the 15 T scale. 
10.3 No hardness test shall be required on tubes smaller than 1⁄4 in. (6.4 mm) in inside diameter or tubes having a wall thickness thinner than 0.020 in. (0.51 mm).

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