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.
Chemical Composition of ASTM A135 Grade A
| Element | Carbon | Manganese | Phosphorus | Sulfur |
| Grade A | 0.25 | 0.95 | 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.
| N.D. | O.D. | SCH 10 | SCH 30/40 | ||||||||
| WALL THICKNESS | NOMINAL WEIGHT | WALL THICKNESS | NOMINAL WEIGHT | ||||||||
| (mm) | (inch) | (mm) | (inch) | (mm) | (inch) | (kg/mtrs) | (lbs/ft) | (mm) | (inch) | (kg/mtrs) | (lbs/ft) |
| 15 | 1/2 | 21.30 | 0.84 | —- | —- | —- | —- | 2.77 | 0.109 | 1.27 | 0.85 |
| 20 | 3/4 | 26.70 | 1.05 | 2.11 | 0.083 | 1.28 | 0.96 | 2.87 | 0.113 | 1.69 | 1.13 |
| 25 | 1 | 33.40 | 1.32 | 2.77 | 0.109 | 2.09 | 1.41 | 3.38 | 0.133 | 2.5 | 1.68 |
| 32 | 1-1/4 | 42.20 | 1.66 | 2.77 | 0.109 | 2.69 | 1.81 | 3.56 | 0.14 | 3.39 | 2.27 |
| 40 | 1-1/2 | 48.30 | 1.90 | 2.77 | 0.109 | 3.11 | 2.09 | 3.68 | 0.145 | 4.05 | 2.72 |
| 50 | 2 | 60.30 | 2.38 | 2.77 | 0.109 | 3.93 | 2.64 | 3.91 | 0.154 | 5.45 | 3.66 |
| 65 | 2-1/2 | 73.00 | 2.88 | 3.05 | 0.12 | 5.26 | 3.53 | 5.16 | 0.203 | 8.64 | 5.8 |
| 80 | 3 | 88.90 | 3.50 | 3.05 | 0.12 | 6.46 | 4.34 | 5.49 | 0.216 | 11.29 | 7.58 |
| 90 | 3-1/2 | 101.60 | 4.00 | 3.05 | 0.12 | 7.41 | 4.98 | 5.74 | 0.226 | 13.58 | 9.12 |
| 100 | 4 | 114.30 | 4.50 | 3.05 | 0.12 | 8.37 | 5.62 | 6.02 | 0.237 | 16.09 | 10.8 |
| 125 | 5 | 141.30 | 5.56 | 3.4 | 0.134 | 11.58 | 7.78 | 6.55 | 0.258 | 21.79 | 14.63 |
| 150 | 6 | 168.30 | 6.63 | 3.4 | 0.134 | 13.85 | 9.30 | 7.11 | 0.28 | 28.29 | 18.99 |
| 200 | 8 | 219.10 | 8.63 | 4.78 | 0.188 | 25.26 | 16.96 | 7.04 | 0.277 | 36.82 | 24.72 |
| 250 | 10 | 273.10 | 10.75 | 4.78 | 0.188 | 31.62 | 21.23 | 7.08 | 0.307 | 51.05 | 34.27 |
