ASTM A135 Grade A

ASTM A135 Grade A

ASTM A135 Grade A

ASTM A135 Grade A is a steel grade used for Electric-Resistance-Welded (ERW) steel pipes. The chemical and mechanical properties of ASTM A135 Grade A pipes make them ideal for use in high-pressure applications, such as conveying gas, vapor, water, or other fluid. In some countries, ASTM A135 Grade A pipes are also used as fire sprinkler pipes. According to the standard, only Grade A pipes are adapted for flanging and bending.

ASTM A135 Grade A is a type of carbon steel that shall be made by either or both basic oxygen or electric-furnace processes. Steel may be cast in ingots or may be strand cast. The pipe shall be manufactured from flat-rolled steel in individual lengths or continuous lengths by electric-resistance or electric-induction welding without the addition of extraneous material. Tensile and chemical requirements of the steel are provided. Specimens of the steel pipes are subject to flattening tests and hydrostatic tests. A nondestructive electric test, either electromagnetic (eddy current) or ultrasonic test, may be preferred as an alternative to the hydrostatic test.

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Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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Chemical Composition of ASTM A135 Grade A

Element Carbon Manganese Phosphorus Sulfur
Grade B 0.3 1.2 0.035 0.035

Mechanical Properties of ASTM A135 Grade A

ITEM Grade A
Tensile strength, min, ksi (MPa) 48 (331)
Yield strength, min, ksi (MPa) 30 (207)
Elongation in 2 in. (50 mm), min, %
For pipe having a specified wall thickness of5 ⁄16in. (7.9 mm) or more, if tested using a longitudinal strip test specimen 35
For pipe having a specified wall thickness of less than5 ⁄16 in. (7.9 mm), if tested using a longitudinal strip test specimen A
For pipe of any size, if tested using a full-size longitudinal test specimen 35

Specifications of ASTM A135 Grade A

The American Society for Testing and Materials ASTM A135 Grade A covers electric-resistance-welded (ERW) steel pipe in sizes NPS 2 to 30, with nominal (average) wall thickness up to 12.7mm, inclusive. It also covers ERW steel pipe in sizes NPS 3/4 to 5 with a nominal (average) wall thickness of 2.11mm to 3.40mm, depending on size. The ASTM A135 standard is widely used in the construction and oil & gas industries because it covers a wide range of applications, including water transmission lines; process piping; distribution piping; condenser and heat exchanger tubes; high-temperature steam lines; and general service lines. This comprehensive listing of standardized pipe dimensions will help engineers and specifiers select the right size pipe for their needs.

Outside Diameter Wall Thickness Weight Of Black Pipes Test Pressure
Nominal Pipe Size Standard Standard Plain End Pipes
INCH MM INCH MM INCH MM KG/MTR MTR/TON LB/FT FT/TON PSI KPA
3/4 20 1.050 26.7 0.083* 2.11 1.28 781 0.86 2562 700 4830
1 25 1.315 33.4 0.109* 2.77 2.09 478 1.41 1568 700 4830
1.1/4 32 1.660 42.2 0.109* 2.77 2.69 372 1.81 1221 1000 6890
1.1/2 40 1.900 48.3 0.109* 2.77 3.11 322 2.09 1056 1000 6890
2 50 2.375 60.3 0.109* 2.77 3.93 254 2.64 833 1000 6890
2.1/2 65 2.875 73.0 0.120* 3.05 5.26 190 3.53 623 1000 6890
3 80 3.500 88.9 0.120* 3.05 6.46 155 4.34 509 1000 6890
3.1/2 90 4.000 101.6 0.120* 3.05 7.41 135 4.98 443 1200 8270
4 100 4.500 114.3 0.120* 3.05 8.37 119 5.62 390 1200 8270
5 125 5.563 141.3 0.134* 3.4 11.58 86 7.78 283 1200 8270
6 150 6.625 168.3 0.134* 3.4 13.85 72 9.3 237 1000 6890
8 200 8.625 219.1 0.188** 4.78 25.26 40 16.96 130 800 5520
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