Our ASTM A709 bridge steel plate pipeline steel has once again helped the construction of the China-Russia East Line Natural Gas Pipeline. During 2017 - 2018, the company successively supplied more than 10,000 tons of high-grade pipeline steel materials for the northern section of the Sino-Russian Eastern Gas Pipeline project, helping the northern section of the ASTM A709 bridge steel plate project to be successfully completed. Now we reload the task and will provide API 5L X80 high-grade pipeline steel for the middle section of the China-Russia Eastern Gas Pipeline project.
Chromium element (Cr element) can improve the strength and hardness of ASTM A709 bridge steel plate, carbon steel in rolling state, reduce elongation and area reduction. When the chromium content is more than 15%, the strength and hardness will decrease, while the elongation and reduction of area will increase correspondingly. It is easy to obtain high surface processing quality for steel parts containing chromium after grinding. The main function of chromium element (Cr element) in quenched and tempered steel structure is to improve hardenability, so that the steel has better comprehensive mechanical properties after quenching and tempering.
SA514 grade S high strength steel alloy element composition% C: 0.11-0.21, Si: 0.15-0.45, Mn: 1.10-1.50, P max.: 0.035, S max.: 0.035, B max.: 0.005, Mo: 0.10-0.60, V max.: 0.06. The mechanical properties in thickness (mm) T≤65 Yield strength (≥Mpa): 690 Tensile strength (Mpa):760-895 Elongation in ≥,%: 18
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