A kind of n800cf steel for pumped storage pressure steel pipe and its manufacturing method

Abstract

The invention discloses N800CF steel for pumped storage pressure steel pipes and a manufacturing method thereof, and relates to the technical field of iron and steel production. Its chemical composition and mass percentage are as follows: C: 0.070%-0.10%, Si: 0.10%-0.30%, Mn : 1.20%~1.50%, P≤0.015%, S≤0.0050%, Ti: 0.006%~0.020%, Cr: 0.20%~0.30%, Ni: 0.40%~0.50%, Mo: 0.10%~0.30%, Cu ≤0.05%, Al: 0.005%~0.015%, Mg: 0.0008%~0.0015%, N≤0.0050%, the balance is Fe and unavoidable impurities. Stirring desulfurization, converter smelting, LF+RH refining, microalloying technology in the refining process reduces the size of inclusions, and nano-scale particles become austenite nucleation particles. After TMCP rolling and quenching and tempering, crystals are formed. The fine tempered sorbite structure can improve the strength and toughness of the steel plate and the welding requirements.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to N800CF steel for pumped-storage pressure steel pipes and a manufacturing method thereof. Background technique [0002] With the transformation and development of the macro economy, clean energy is becoming more and more important to the sustainable development of the country. As a clean energy, hydropower has the characteristics of being renewable, non-polluting, low operating cost, and convenient for power peak regulation, which is conducive to improving resource utilization. Therefore, under the circumstance that traditional energy sources are increasingly tense, countries around the world generally give priority to the use of water resources and vigorously develop hydropower. In 2010, the number of hydropower stations built in my country exceeded 200 million kilowatts, and in 2020 it will reach 330 million kilowatts. With the acceleration of my country's hy...

AI Technical Summary

Problems solved by technology

However, compared with foreign countries, domestic product quality is relatively close in terms of strength level, but there is still a certain gap in terms of plasticity index and low temperature impact performance.

Images