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Welded steel pipe is made by rolling of a steel coil to the required gauge thickness, a manufacturing procedure that leaves a seam on the pipe's body. According to the welding method, welded steel pipe can be divided into electric resistance welded pipe (ERW pipe), spiral submerged arc-welding pipe (SSAW pipe), and longitudinal submerged arc-welding pipe (LSAW pipe). These three types of welded steel pipe are manufactured in significantly different ways.
Because of the welding method, welded steel pipe was less strong than seamless steel pipe. Thus welded steel pipe often used in low pressure application. But welded steel pipes are widely used in major pipeline projects, and they can also be used a lot water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction, liquid transportation, (such as water supply and drainage), gas transportation ( such as gas, steam, liquefied petroleum gas etc).
| Standard | Grade | Chemical Components (% | Mechanical Properties | |||||
| ASTM A53 | C | Si | Mn | P | S | Tensile STrength(Mpa) | Yield STrength(Mpa） | |
| A | ≤0.25 | 一 | ≤0.95 | ≤0.05 | ≤0.06 | ≥330 | ≥205 | |
| B | ≤0.30 | 一 | 51.2 | S0.05 | S0.06 | 2415 | ≥240 | |
| ASTM A106 | A | ≤0.30 | 20.1 | 0.29-1.06 | ≤0.035 | ≤0,035 | 2415 | 2240 |
| B | ≤0.35 | 20.1 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≥485 | ≥275 | |
| ASTM SA179 | A179 | 0.06-0.18 | 0.27-0.63 | ≤0.035 | ≤0.035 | ≥325 | ≥180 | |
| ASTM SA192 | A192 | 0.06-0.18 | ≤0.25 | 0.27-0.63 | ≤0.035 | 50.035 | ≥325 | ≥180 |
| API5L PSL1 | A | 0.22 | 一 | 0.9 | 0.03 | 0.03 | 2331 | ≥207 |
| B | 0.28 | 一 | 1.2 | 0.03 | 0.03 | ≥414 | ≥241 | |
| X42 | 0.28 | 一 | 1.3 | 0.03 | 0.03 | ≥414 | ≥290 | |
| X46 | 0.28 | 一 | 1.4 | 0.03 | 0.03 | 2434 | 2317 | |
| X52 | 0.28 | 一 | 1.4 | 0.03 | 0.03 | ≥455 | ≥359 | |
| X56 | 0.28 | 1.4 | 0.03 | 0.03 | ≥490 | ≥386 | ||
| X60 | 0.28 | 1.4 | 0.03 | 0.03 | 2517 | ≥448 | ||
| X65 | 0.28 | 一 | 1.4 | 0.03 | 0.03 | ≥531 | ≥448 | |
| X70 | 0.28 | 一 | 1.4 | 0.03 | 0.03 | ≥565 | 2483 | |
| API5L PSL2 | B | 0.24 | 一 | 1.2 | 0.025 | 0.015 | ≥414 | ≥241 |
| X42 | 0.24 | 1.3 | 0.025 | 0.015 | 2414 | ≥290 | ||
| X46 | 0.24 | 一 | 1.4 | 0.025 | 0.015 | ≥434 | ≥317 | |
| X52 | 0.24 | 一 | 1.4 | 0.025 | 0.015 | ≥455 | ≥359 | |
| X56 | 0.24 | 1.4 | 0.025 | 0.015 | ≥490 | ≥386 | ||
| X60 | 0.24 | 一 | 1.4 | 0.025 | 0.015 | ≥517 | 2414 | |
| X65 | 0.24 | 一 | 1.4 | 0.025 | 0.015 | ≥531 | ≥448 | |
| X70 | 0.24 | 一 | 1.4 | 0.025 | 0.015 | ≥565 | 2483 | |
| X80 | 0.24 | 1.4 | 0.025 | 0.015 | ≥621 | ≥552 | ||
Uses of welded steel pipe include energy, construction, automotive, marine and offshore industries, telecommunication, agriculture and general fabrication.
Welded steel pipe has a large number of applications in the field of construction, mainly used in building structures and reinforced concrete formwork.
Welded steel pipe also has important applications in shipbuilding. It is mainly used to build the main structure of the ship, such as the hull, deck, bow, stern and other parts.
Widely used in oil and gas extraction, transportation and processing. It is used in the manufacture of oil well pipes, pipelines, drilling pipes and other petroleum equipment.
Welded steel pipe is widely used to manufacture a variety of mechanical equipment and parts, such as automobiles, ships, airplanes and construction machinery etc.
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