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MC5 Steel and large-sized flattening roll prepared by using the same, and manufacturing process of MC5 steel

A leveling roll and process technology, applied in the field of large leveling roll, large leveling roll and MC5 steel manufacturing process

Active Publication Date: 2012-05-02
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]At present, large smooth rolls with a finished roll body diameter of 800mm or more are made of 2%Cr steel, which has a low degree of alloying and a hardened layer thickness of only 10mm-15mm , when rolling steel plates, the rolling capacity per 1mm roll body thickness is about 3200 tons. When rolling high-strength metal plates, water ripple-like surface defects are often formed on the surface of the plates, which is difficult to meet product requirements. Therefore, it can no longer adapt to the current high-end metal High service life requirements for plate rolling and skin pass rolls

Method used

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  • MC5 Steel and large-sized flattening roll prepared by using the same, and manufacturing process of MC5 steel
  • MC5 Steel and large-sized flattening roll prepared by using the same, and manufacturing process of MC5 steel
  • MC5 Steel and large-sized flattening roll prepared by using the same, and manufacturing process of MC5 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] Electric furnace ingredients: 35% to 50% of high-quality steel scrap, 15% to 25% of returned steel, 15% to 30% of high-quality refining

[0050] Steel pig iron or 35% hot-charged molten iron and 10%-20% sponge iron are charged and melted by electricity.

[0051] Melt analysis of harmful elements As, Sn, Pb are all ≤0.02%.

[0052] Oxidation temperature ≥ 1550 ℃, decarburization ≥ 0.40%.

[0053] Electric furnace tapping conditions: C ≥ 0.50%, P ≤ 0.007%, temperature ≥ 1640 ℃.

[0054] When the steel is tapped, 1Kg to 1.5Kg per ton of steel is added to the ladle for pre-deoxidation, and at the same time, lime or pre-melted slag accounting for about 2% of the molten steel is added, and 70% of Cr, Ni, Mo alloy.

[0055] After tapping, transfer to LF / VD refining station, then add lime and fluorite accounting for about 2% of the molten steel weight, heat with electricity and use 3Kg~5Kg carbon powder per ton of steel and 2Kg~5Kg ferrosilicon powder per ton of steel for de...

specific Embodiment approach

[0130] A kind of technique of manufacturing described MC5 steel is characterized in that: comprise the following steps:

[0131] ①Select steelmaking raw materials and add sponge iron accounting for 10 wt%-20 wt% of the raw materials, and control the content of harmful elements such as Cu, Pb, As, Sn, Sb, and Bi to the range of the above-mentioned MC5 steel;

[0132] ②Control the smelting temperature of the electric arc furnace, and the amount of oxidation and decarburization is ≥0.40wt%. And according to the composition calculation, add the required amount of 60wt% ~ 80wt% Cr, Ni, Mo alloy;

[0133] ③The ladle furnace adopts bottom-blown argon stirring and vacuum degassing compound refining, adding slag material at 2wt%~4wt% of the total weight of molten steel, adding deoxidizer at 6Kg~10Kg per ton of steel, adding the remaining alloy after sampling and analyzing the slag white , adjust the composition to the specified range, transfer the molten steel to the vacuum tank after...

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Abstract

The invention relates to an MC5 steel and a large-sized flattening roll prepared by using the same, and a manufacturing process of the MC5 steel, wherein the MC5 steel comprises the following chemical components in weight percentages: 0.75%-0.90% C, 0.40%-0.80% Si, 0.20%-0.50% Mn, 4.80%-5.20% Cr, 0.30%-0.60% Ni, 0.20%-0.60% Mo, 0.10%-0.20% V, less than or equal to 0.015% P, less than or equal to 0.015% S, less than or equal to 0.20% Cu, less than or equal to 0.01% Al, less than or equal to 0.02% Pb, less than or equal to 0.02% As, less than or equal to 0.02% Sn, less than or equal to 0.02% Sb, less than or equal to 0.02% Bi, less than or equal to 2 ppm of H, less than or equal to 30 ppm of O, less than or equal to 120 ppm of N, and rest being Fe and inevitable impurities; and the MC5 steel is capable of meeting the utilization requirements of high-end metal plate rolling and long service life of the flattening roll.

Description

technical field [0001] The invention belongs to the technical field of high-end metallurgical equipment manufacturing, relates to a 5±0.2wt%Cr-MC5 steel, and uses the steel type to manufacture large-scale leveling rolls with a finished roll body diameter of more than 800mm, and specifically relates to an MC5 steel and its preparation The large-scale leveling roll and the manufacturing process of MC5 steel. Background technique [0002] There are various methods and techniques for processing metal materials, but no matter what technique is used, it is finally put into use after rolling, forging, cutting and necessary performance treatment. Among the current processing techniques, the proportion of rolled products is far greater than that of other production techniques, and it is widely used, especially in high-end wide-width alloy plates for aerospace, steel plates for cars and other non-ferrous metals. In the production of metal materials such as strips, precision rolling i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/46C21C5/52C21C7/10C21C7/072C21D8/02C21D1/28C21D1/30C21D1/26C22B9/18
CPCY02P10/20
Inventor 薛正国王国宣高全德刘秀珍高英丽杨丽霞
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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