阅读说明：本技术 一种高耐磨高铬铸铁万能辊环及其制备方法 (High-wear-resistance high-chromium cast iron universal roll collar and preparation method thereof ) 是由 刘娣 杜江伟 杜旭景 胡兵 于 2021-06-15 设计创作，主要内容包括：本发明涉及一种高耐磨高铬铸铁万能辊环及其制备方法,属于机械加工技术领域,各合金元素成分及重量百分含量为C：2.00～3.00%,Si：0.30～1.20%,Mn：0.50～1.50%,P≤0.03%；S≤0.03%,Cr：12.0～22.0%,Ni：0.50～3.00%,Mo：0.60～2.00%,V：0.10-2.00%,其余为Fe和不可避免的杂质；将配好的合金原料放入中频炉中熔炼后采用整体方式进行浇注。本发明制备的万能辊环的综合性能能够满足型钢轧线万能轧机水平辊环的要求,延长了在机周期,提高了轧材的过钢量,且提升了轧材表面质量；整体浇注方式提高了辊环组织的致密性,改善了产品整体的使用效果。(The invention relates to a high-wear-resistance high-chromium cast iron universal roll collar and a preparation method thereof, belonging to the technical field of machining, wherein the high-wear-resistance high-chromium cast iron universal roll collar comprises the following alloy elements in percentage by weight: 2.00-3.00%, Si: 0.30-1.20%, Mn: 0.50-1.50% and P is less than or equal to 0.03%; s is less than or equal to 0.03%, Cr: 12.0-22.0%, Ni: 0.50-3.00%, Mo: 0.60-2.00%, V: 0.10-2.00%, and the balance of Fe and inevitable impurities; and putting the prepared alloy raw materials into an intermediate frequency furnace for smelting, and then pouring in an integral mode. The universal roll collar prepared by the method has the advantages that the comprehensive performance can meet the requirements of a horizontal roll collar of a universal rolling mill on a section steel rolling line, the machine period is prolonged, the steel passing amount of a rolled material is increased, and the surface quality of the rolled material is improved; the integral casting mode improves the compactness of the roll collar structure and improves the integral using effect of the product.)

1. The utility model provides a high wear-resisting high chromium cast iron omnipotent collars which characterized in that: the high-chromium cast iron comprises the following alloy element components in percentage by weight: 2.00-3.00%, Si: 0.30-1.20%, Mn: 0.50-1.50%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr: 12.0-22.0%, Ni: 0.50-3.00%, Mo: 0.60-2.00%, V: 0.10-2.00%, and the balance of Fe and inevitable impurities.

2. The high wear resistant high chromium cast iron universal roll collar of claim 1, wherein: the high-chromium cast iron comprises the following alloy element components in percentage by weight: 2.30-2.80%, Si: 0.80-1.00%, Mn: 0.80-1.20%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr: 15.0-20.0%, Ni: 1.40-2.00%, Mo: 1.40-2.00%, V: 0.70-1.20%, and the balance of Fe and inevitable impurities.

3. A method for preparing the high wear-resistant high chromium cast iron universal roll collar of claim 1 or 2, characterized by comprising the steps of:

(1) putting the prepared alloy raw materials into an intermediate frequency furnace for smelting, and adjusting chemical components;

(2) the molten steel melted in the step (1) is calmed for a period of time;

(3) when the molten steel in the step (2) reaches the pouring temperature, pouring can be carried out in an integral mode;

(4) machining the cast finished in the step (3), quenching at a certain temperature, and cooling;

(5) and (4) when the temperature is cooled to a certain temperature in the step (4), tempering treatment is carried out to obtain the high-wear-resistance high-chromium cast iron universal roll collar.

4. The method for preparing the high-wear-resistance high-chromium cast iron universal roll collar as claimed in claim 3, wherein the method comprises the following steps: the molten steel calming time in the step (2) is more than or equal to 20 min.

5. The method for preparing the high-wear-resistance high-chromium cast iron universal roll collar as claimed in claim 3, wherein the method comprises the following steps: the pouring temperature in the step (3) is not less than (molten steel melting point) +80 ℃.

6. The method for preparing the high-wear-resistance high-chromium cast iron universal roll collar as claimed in claim 3, wherein the method comprises the following steps: the quenching temperature in the step (4) is 1050-.

7. The method for preparing the high-wear-resistance high-chromium cast iron universal roll collar as claimed in claim 3, wherein the method comprises the following steps: after the step (5) is cooled to 350-450 ℃, not less than two-stage tempering treatment is carried out, wherein the tempering temperature is 550-650 ℃ and the tempering time is 30-40 h.

Technical Field

The invention relates to a high-wear-resistance high-chromium cast iron universal roll collar and a preparation method thereof, belonging to the technical field of machining.

Background

When a rack of the section steel universal rolling mill works, a section steel web and a flange are in contact with the excircle and two end faces of a horizontal roll collar, the main working faces of the horizontal roll collar are the excircle and two end faces, the section steel flange and the web carry out continuous contact abrasion on the roll collar, and the horizontal roll collar has good abrasion resistance and accident resistance, namely the horizontal roll collar is required to have higher abrasion resistance and small hardness drop.

The horizontal roll collar of the existing section steel universal mill can be made of graphite steel, semisteel and high-carbon semisteel, and the horizontal roll collar made of the three materials has the advantages of good strength and toughness, poor wear resistance, short rolling period and no wear resistance. The high-chromium cast iron material contains high-content alloy elements such as Ni, Cr, Mo and V, and the horizontal roll collar with a matrix structure of martensite and residual austenite + carbide and granular carbide dispersed in the matrix structure can be obtained by reasonably controlling the content of each alloy element and reasonably smelting, pouring and heat treatment processes, so that the good wear resistance of the horizontal roll collar can be ensured. The hardness of the prepared horizontal roll collar finished product can be kept above 60HSD, the roll surface of the lower roll collar is smoother than that of the conventional material, and the surface quality and yield of the rolled material are effectively improved.

Disclosure of Invention

The invention aims to provide a high-wear-resistance high-chromium cast iron universal roll collar and a preparation method thereof, so that a roll can adapt to complex rolling conditions of a universal rack of a section mill, and has comprehensive properties of high wear resistance, good heat cracking resistance and the like.

In order to achieve the purpose, the invention adopts the technical scheme that:

the high-wear-resistance high-chromium cast iron universal roll collar comprises the following alloy element components in percentage by weight: 2.00-3.00%, Si: 0.30-1.20%, Mn: 0.50-1.50%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr: 12.0-22.0%, Ni: 0.50-3.00%, Mo: 0.60-2.00%, V: 0.10-2.00%, and the balance of Fe and inevitable impurities.

The technical scheme of the invention is further improved as follows: the high-chromium cast iron comprises the following alloy element components in percentage by weight: 2.30-2.80%, Si: 0.80-1.00%, Mn: 0.80-1.20%, P is less than or equal to 0.03%, S is less than or equal to 0.03%, Cr: 15.0-20.0%, Ni: 1.40-2.00%, Mo: 1.40-2.00%, V: 0.70-1.20%, and the balance of Fe and inevitable impurities.

A method for preparing a high-wear-resistance high-chromium cast iron universal roll collar comprises the following steps:

(1) putting the prepared alloy raw materials into an intermediate frequency furnace for smelting, and adjusting chemical components;

(2) the molten steel melted in the step (1) is calmed for a period of time;

(3) when the molten steel in the step (2) reaches the pouring temperature, pouring can be carried out in an integral mode;

(4) machining the cast finished in the step (3), quenching at a certain temperature, and cooling;

(5) and (4) when the temperature is cooled to a certain temperature in the step (4), tempering treatment is carried out to obtain the high-wear-resistance high-chromium cast iron universal roll collar.

The technical scheme of the invention is further improved as follows: the molten steel calming time in the step (2) is more than or equal to 20 min.

The technical scheme of the invention is further improved as follows: the pouring temperature in the step (3) is not less than (molten steel melting point) +80 ℃.

The technical scheme of the invention is further improved as follows: the quenching temperature in the step (4) is 1050-.

The technical scheme of the invention is further improved as follows: after the step (5) is cooled to 350-450 ℃, not less than two-stage tempering treatment is carried out, wherein the tempering temperature is 550-650 ℃ and the tempering time is 30-40 h.

Due to the adoption of the technical scheme, the invention has the following technical effects:

according to the invention, by reasonably controlling the content and the corresponding proportion of each alloy element, the comprehensive performance of the prepared universal roll collar can meet the requirements of a horizontal roll collar of a universal rolling mill on a section steel rolling line, the on-machine period is prolonged compared with that of a conventional material, the steel passing amount of a rolled material is increased, the single steel passing amount of the high-chromium cast iron roll collar is 1.5 times that of a semi-steel roll collar, and the surface quality of the rolled material is improved.

According to the invention, through the production mode of integral casting, the compactness of the roll collar structure is improved, and the integral use effect of the product is improved; through the cooperative control of the molten steel calming time and the pouring temperature, the casting quality and the structure guarantee force of the product are improved, and the machine period is obviously prolonged.

By adopting the quenching and tempering process, the invention not only ensures higher surface hardness and tissue uniformity of the horizontal roll collar, but also prevents the cracking risk of high alloy materials.

Drawings

FIG. 1 is a metallographic structure diagram of a roll collar in example 1 of the present invention.

Detailed Description

The present invention will be further described in detail with reference to specific examples below:

the invention discloses a high-wear-resistance high-chromium cast iron universal roll collar and a preparation method thereof, and aims to prepare a high-chromium iron universal roll collar with excellent heat cracking resistance and accident resistance, effectively prolong the on-machine period, increase the steel passing amount of a rolled material and obviously improve the surface quality of the rolled material.

The high-wear-resistance high-chromium cast iron universal roll collar comprises the following alloy element components in percentage by weight: 2.00-3.00%, Si: 0.30-1.20%, Mn: 0.50-1.50% and P is less than or equal to 0.03%; s is less than or equal to 0.03%, Cr: 12.0-22.0%, Ni: 0.50-3.00%, Mo: 0.60-2.00%, V: 0.10-2.00%, and the balance of Fe and inevitable impurities; preferably C: 2.30-2.80%, Si: 0.80-1.00%, Mn: 0.80-1.20 percent of P, and less than or equal to 0.03 percent of P; s is less than or equal to 0.03%, Cr: 15.0-20.0%, Ni: 1.40-2.00%, Mo: 1.40-2.00%, V: 0.70-1.20%, and the balance of Fe and inevitable impurities.

A method for preparing a high-wear-resistance high-chromium cast iron universal roll collar comprises the following steps:

(1) putting the prepared alloy raw materials into an intermediate frequency furnace for smelting, and adjusting chemical components;

(2) the molten steel melted in the step (1) is calmed for more than or equal to 20 min;

(3) when the molten steel in the step (2) is more than or equal to (the melting point of the molten steel) +80 ℃, pouring in an integral mode;

(4) after machining the casting finished in the step (3), quenching at 1050-;

(5) cooling to 350-450 ℃, and then performing at least two-stage tempering treatment at the tempering temperature of 550-650 ℃ for 30-40h to obtain the high-wear-resistant high-chromium cast iron universal roll collar.

Example 1:

(1) putting the prepared alloy raw materials into an intermediate frequency furnace for smelting, wherein the raw material alloy components and the weight percentage of each alloy component are as follows: 2.40%, Si: 0.80%, Mn: 0.85%, Cr: 15.0%, Ni: 1.45%, Mo: 1.40%, V: 0.85 percent of the total weight of the active carbon, and less than or equal to 0.03 percent of P; less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities.

(2) After the smelting in the step (1) is finished, the molten steel is kept for 25 min.

(3) When the temperature of the molten steel reaches the melting point of the molten steel plus 80 ℃, pouring in an integral mode;

(4) machining the cast in the step (3), quenching at 1060 ℃, and cooling;

(5) and when the temperature is cooled to 420 ℃, stopping cooling and carrying out two-stage tempering treatment, wherein the tempering temperature is 570 +/-5 ℃, and the tempering time is 35 hours respectively, so that the high-wear-resistance high-chromium cast iron universal roll collar is obtained, and the metallographic structure diagram of the roll collar is shown in figure 1.

Examples 2 to 4 and comparative examples 1 to 3

The manufacturing method of each embodiment and the comparative example has the same process steps as the embodiment 1, the comparative example 1 is made of a conventional semisteel material, and the differences are shown in the following table:

the results of the tests of examples 1 to 4 and comparative examples 1 to 3 were as follows:

the detection result in the embodiment shows that the hardness of the working layer of the high-wear-resistance high-chromium iron horizontal roll collar is 60-75 HSD, and the working requirement is met.

The embodiments of the present invention are merely preferred embodiments, and the scope of the present invention is not limited thereby.