Cerium-contained steel for centrifugal ductile ink cast tube die and preparation method of cerium-contained steel

Abstract

The invention relates to cerium-contained steel for a centrifugal ductile ink cast tube die and a preparation method of the cerium-contained steel and belongs to the field of steel and iron materials.The cerium element is added to 21CrMo10 steel, and ingredient optimization is performed. The activity of the molybdenum in the steel is improved through the addition of the cerium, the effect of themolybdenum is enhanced, and the effect of combination alloying is achieved; the cerium can improve the high-temperature mechanical performance and corrosion resistance of the steel, and meanwhile thecerium can also improve the high-temperature oxidation resistance performance of the steel; and the cerium can refine grains, the toughness of the steel is further improved, and thus the thermal fatigue life of the steel is prolonged. The content of the cerium element added to the steel is not large, the content of the molybdenum is lowered through ingredient optimization, and the production costis slightly lowered.

Description

technical field [0001] The invention relates to a cerium-containing centrifugal nodular cast pipe mold steel and a preparation method thereof, belonging to the field of iron and steel materials. Background technique [0002] Due to its excellent performance and low price, nodular cast pipes are widely used in the transportation of water, gas and oil. 21CrMo10 is the steel used for pouring pipe molds for centrifugal nodular cast pipes with a large amount, and has broad market prospects. The working environment of the pipe mold is harsh. During pouring, the molten iron is deposited on the inner wall of the pipe mold due to centrifugal action, so that the temperature of the pipe mold rises sharply, and the outer surface is cooled by circulating water to reduce the temperature. Changes in temperature cause alternating changes in stress, and thermal fatigue will occur after a period of service, eventually forming large-scale cracks. The national standard GB / T 25715-2010 "Centrif...

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Problems solved by technology

The Cr element in 21CrMo10 steel plays a role in improving the high-temperature mechanical properties, corrosion resistance and hardenability of the steel. The Mo element improves the hardenability and high-temperature strength of the steel and improves the tempering stability of the steel, but the Mo element is expensive. , the improvement of the strength and toughness of steel is limited