The weldability of A572 Grade 42 high quality is good. It means that under certain process and construction conditions, A572 Grade 42 high quality can obtain good performance after welding. Weldability is a measure of the hot workability of steel. Weldability can be divided into weldability in construction and weldability in use. Weldability in construction refers to the sensitivity of cracking in weld metal and near seam zone, and hardening sensitivity of steel in near seam zone. Good weldability means that under certain welding process conditions, the weld metal and steel near the seam do not produce cracks. Weldability in use means that the mechanical properties of weld and HAZ steel are not lower than those of base metal.
After the official operation of the national pipeline network in October 2020, relevant oil and gas pipeline construction projects have accelerated. The main planned projects include West-East Gas Pipeline 4 and 5, New Gas Pipeline (Xinjiang Coal-to-Gas Export Pipeline Project) and LNG ( Liquefied natural gas) export pipelines, etc.
High purity of A572 Grade 42 high quality, steel for hydropower: the inclusions P, S and H, O, N gas content in steel are strictly controlled.The steel for hydropower has ideal strength reserve: the yield strength and tensile strength level are controlled moderately, and the surplus is usually controlled in a reasonable yield strength ratio of 50-3.3 and 80MPac6. The yield strength ratio is more reasonable by adjusting the composition and improving the technology.