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

A centrifugal ball and cast tube technology, applied in the field of iron and steel materials, can solve the problems of high price of Mo element and limited improvement in strength and toughness.

Pending Publication Date: 2018-06-15
JIANGSU UNIV
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AI Technical Summary

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 hardenabilit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A 25kg vacuum induction furnace is used for smelting. The material of the induction furnace crucible is MgO. Steel ingots can be poured in the vacuum chamber. The induction furnace is equipped with a three-time addition device in a vacuum state. The raw materials for smelting include industrial pure iron, metal manganese, metal molybdenum, metal cerium, aluminum, ferrosilicon and waste graphite electrodes (used for composition adjustment of C), etc. In order to prevent the cold steel remaining in the crucible from different steel types smelted in the previous period from interfering with the composition of the test steel, the furnace was "washed" twice with industrial pure iron before smelting. Before smelting, the alloy is accurately weighed according to the 21kg steel ingot, and the ingredients are accurately proportioned to ensure that the smelting composition is within the control range.

[0020] Put the weighed industrial pure iron, metal nickel, metal molybdenum, ...

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/22C22C33/06
CPCC22C33/06C22C38/005C22C38/02C22C38/04C22C38/22C22C38/44
Inventor 李亚波赵继朋孙国辉王董浩郭愚于超
Owner JIANGSU UNIV
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