Specification Octal supply API 5L welded ( ERW, EFW , LSAW, SSAW ) steel line pipe in Gr B, X42, X46, X52, X56, X60, X65 PSL1, PSL2 and for sour service (NACE pipe). Line pipe brief introduction API 5L steel line pipe is for oil and gas ind.
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carbon steel pipe
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Mild and low carbon steel
Mild steel is the most common form of steel because its price is relatively low while it provides material properties that are acceptable for many applications. Low carbon steel contains approximately 0.05–0.15% carbon and mild steel contains 0.16–0.29% carbon; therefore, it is neither brittle nor ductile. Mild steel has a relatively low tensile strength, but it is cheap and malleable; surface hardness can be increased through carburizing.
It is often used when large quantities of steel are needed, for example as structural steel. The density of mild steel is approximately 7.85 g/cm3 (7850 kg/m3 or 0.284 lb/in3) and the Young's modulus is 210 GPa (30,000,000 psi).
Low carbon steels suffer from yield-point runout where the material has two yield points. The first yield point (or upper yield point) is higher than the second and the yield drops dramatically after the upper yield point. If a low carbon steel is only stressed to some point between the upper and lower yield point then the surface may develop Lüder bands.
carbon steel pipe
Similar to a heat-transfer system, the petroleum industry typically will use a seamless carbon steel pipe to transfer petroleum. This pipe typically is much larger thancarbon steel pipes used for other purposes to allow the pipe to carry the large amount of petroleum.
Pipes are a common product made from the higher carbon category. Generally, a low carbon steel pipe is used for transmitting substances such as gas and oil. The steelmaking process as well as the deoxidation method can influence the properties of low carbon steel.
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