Low-carbon peritectic steel continuous casting round billet for high-pressure boiler and manufacturing method of low-carbon peritectic steel continuous casting round billet

Abstract

The invention discloses a low-carbon peritectic steel continuous casting round billet for a high-pressure boiler and a manufacturing method of the low-carbon peritectic steel continuous casting round billet, and relates to the technical field of steel production, and the low-carbon peritectic steel continuous casting round billet is characterized by comprising the following chemical components in percentage by mass: 0.08-0.16% of C, 0.13-0.38% of Si, 0.40-0.60% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.80-1.10% of Cr, 0.20-0.35% of Mo, 0.13-0.25% of V, less than or equal to 0.015% of Ti, less than or equal to 0.25% of Ni, less than or equal to 0.28% of Cu, less than or equal to 0.025% of Al, less than or equal to 0.015% of Zr According to the high-pressure boiler pipe and the preparation method thereof, the finally manufactured high-pressure boiler pipe has the advantages of being good in cleanliness, narrow in component control and the like through the reasonable element proportion and the LF and VD refining treatment processes, and the use requirements of the high-pressure boiler pipe are completely met.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a low-carbon peritectic steel continuous casting round billet for high-pressure boilers and a manufacturing method thereof. Background technique [0002] High pressure boiler seamless steel tube round tube billet is mainly used to manufacture seamless steel tubes for heating surface pipes, headers, economizers and other equipment of steam boilers for high pressure boilers in thermal power plants. The working pressure is generally above 9.8MPa and the working temperature is Between 450 and 650 °C, the operating environment is relatively harsh, often under high temperature and high pressure conditions, and the steel pipe will be oxidized and corroded under the action of high temperature flue gas and water vapor. Steel pipes are required to have good strength, toughness, oxidation and corrosion resistance, and good stability. Therefore, the quality requirements for...

AI Technical Summary

Problems solved by technology

[0003] Alloy steel pipes for high-pressure boilers are mostly low-carbon peritectic steels, and the carbon content of low-carbon peritectic steels generally ranges from 0.08% to 0.17%. Usually, high-pressure boiler alloy tube billet steels mostly belong to this type of steel, and low-carbon peritectic steels range from When the liquid phase is cooled to 1495°C, peritectic reaction occurs, which is easy to produce strong linear shrinkage and volume shrinkage, resulting in uneven shrinkage and uneven thickness of the billet shell, and it is easy to form surface quality defects such as cracks and depressions in weak places, which is continuous One of the steel types that are difficult to produce in the casting process. For many years, high-pressure boiler tube manufacturers have used hot-rolled round steel + cold-rolled and cold-drawn tubes to make tubes, and the manufacturing cost is relatively high.