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ASTM A135 Grade A

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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

ElementCarbonManganesePhosphorusSulfur
Grade A0.250.950.0350.035

Mechanical Properties of ASTM A135 Grade A

ITEMGrade 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 specimen35
For pipe having a specified wall thickness of less than5 ⁄16 in. (7.9 mm), if tested using a longitudinal strip test specimenA
For pipe of any size, if tested using a full-size longitudinal test specimen35

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.

N.D.O.D.SCH 10SCH 30/40
WALL THICKNESSNOMINAL WEIGHTWALL THICKNESSNOMINAL WEIGHT
(mm)(inch)(mm)(inch)(mm)(inch)(kg/mtrs)(lbs/ft)(mm)(inch)(kg/mtrs)(lbs/ft)
151/221.300.84—-—-—-—-2.770.1091.270.85
203/426.701.052.110.0831.280.962.870.1131.691.13
25133.401.322.770.1092.091.413.380.1332.51.68
321-1/442.201.662.770.1092.691.813.560.143.392.27
401-1/248.301.902.770.1093.112.093.680.1454.052.72
50260.302.382.770.1093.932.643.910.1545.453.66
652-1/273.002.883.050.125.263.535.160.2038.645.8
80388.903.503.050.126.464.345.490.21611.297.58
903-1/2101.604.003.050.127.414.985.740.22613.589.12
1004114.304.503.050.128.375.626.020.23716.0910.8
1255141.305.563.40.13411.587.786.550.25821.7914.63
1506168.306.633.40.13413.859.307.110.2828.2918.99
2008219.108.634.780.18825.2616.967.040.27736.8224.72
25010273.1010.754.780.18831.6221.237.080.30751.0534.27
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