Introduction and Application of X70 Pipeline Steel

Main properties of X70 pipeline steel

X70 pipeline steel has high strength, high toughness, good weldability, certain resistance to HIC and SSC, and the improvement of pipeline steel grade can save construction costs.

Delivery status of X70 pipeline steel

X70 pipeline steel is mainly supplied in hot rolled or normalized state and implement API 5L-2012 standard, GB national standard, special standards for various projects.

Analysis of chemical composition of X70 pipeline steel

Early pipeline steels always used ordinary carbon steels of C, Mn, and Si types, which focused on performance in metallurgy and did not have strict regulations on chemical composition. Since the 1960s, with the increase in the pressure and diameter of oil and gas pipelines, low-alloy high-strength steel (HSLA) has been adopted.

Chemical composition of X70 pipeline steel:

Grade	C	Si	Mn	P	S	V+Nb+Ti
X70 pipeline steel	≤0.12	≤0.45	≤;1.70	≤0.025	≤0.015	≤0.15

Attachment: Cu≤0.50%; Ni≤0.50%; Cr≤0.50%; Mo≤0.50%; B≤0.001%

Mechanical properties of X70 pipeline steel:

Grade	Yield strength MPa	Tensile strength MPa	Yield strength ratio
X70 pipeline steel	485-635	570-760	≥0.93

Practical application of X70 pipeline steel: X70 pipeline steel is mainly used in oil and gas pipelines.