阅读说明：本技术 一种耐磨耐热钢及其制备方法 (Wear-resistant and heat-resistant steel and preparation method thereof ) 是由 朱鹤峰 于 2018-06-20 设计创作，主要内容包括：本发明的目的在于提供一种耐磨耐热钢的制备方法,降低成本；本发明一种耐磨耐热钢,其特征是由以下成分及重量百分比组成：C：0.24-0.4％、Mn：9.5-10.5％、Si：1.5-1.9％、Nb：0.7-1.20％、V：0.5-0.8％、Cr：19-21％、Ni：5-6％、P：0-0.045％、S：0.2-0.3％,余量为Fe；本发明的有益效果为,耐热耐磨合金性能良好,具有高硬度、高强度、高韧性等特点,适汽车、推土机、装载机、挖掘机、自卸车等各种矿山机械、工程机械。(The invention aims to provide a preparation method of wear-resistant and heat-resistant steel, which reduces the cost; the invention relates to wear-resistant heat-resistant steel which is characterized by comprising the following components in percentage by weight: c: 0.24-0.4%, Mn: 9.5-10.5%, Si: 1.5-1.9%, Nb: 0.7-1.20%, V: 0.5-0.8%, Cr: 19-21%, Ni: 5-6%, P: 0-0.045%, S: 0.2-0.3%, the balance being Fe; the invention has the advantages of good heat-resistant and wear-resistant alloy performance, high hardness, high strength, high toughness and the like, and is suitable for various mining machines and engineering machines such as automobiles, bulldozers, loaders, excavators, dump trucks and the like.)

1. The wear-resistant heat-resistant steel is characterized by comprising the following components in percentage by weight: c: 0.24-0.4%, Mn: 9.5-10.5%, Si: 1.5-1.9%, Nb: 0.7-1.20%, V: 0.5-0.8%, Cr: 19-21%, Ni: 5-6%, P: 0-0.045%, S: 0.2-0.3%, and the balance of Fe.

2. A wear and heat resistant steel as claimed in claim 1, characterized by consisting of the following components in weight percent: c: 0.3-0.35%, Mn: 9.8-10.3%, Si: 1.7-1.8%, Nb: 0.75-1.0%, V: 0.7-0.75%, Cr: 19.5-20%, Ni: 5.5-5.9%, P: 0.005-0.040%, S: 0.25-0.28% and the balance Fe.

3. The preparation method of the heat-resistant and wear-resistant steel is characterized by comprising the following steps of:

s1: smelting according to the component proportion to obtain the basic chemical components of the molten steel;

s2: heating and baking the sulfur ore with the sulfur content of 40% at 280-320 ℃ for 25-35 minutes;

s3: adding the sulfur ore into furnace burden for three times;

s4: sampling and sample preparation are carried out after the melting is finished, and qualified tapping and pouring are confirmed.

4. The method for preparing heat and wear resistant steel according to claim 3, wherein the charge heating temperature is 300 ℃.

5. The method for preparing heat-resistant and wear-resistant steel according to claim 3, wherein the first sulfur ore is added in an amount of 30%, and molten steel is melted in an amount of 80%; after the sulfur ore is added into the molten steel, a deslagging agent is immediately added for covering, and the temperature is raised by 30 percent of power.

6. The method for preparing heat-resistant and wear-resistant steel according to claim 5, wherein the sulfur ore is added in an amount of 40% for the second time, and the molten steel is melted by 90%; adding sulfur ore into molten steel at the heating temperature of 300 ℃, adding a deslagging agent to cover and heating at the power of 30%.

7. The method for preparing heat-resistant and wear-resistant steel according to claim 6, wherein the sulfur ore is added in an amount of 30% for the third time, and after the sulfur ore is added into the molten steel, a deslagging agent is added to cover the molten steel and the molten steel is dissolved by heating with a power of 30%.

8. The method for preparing heat-resistant and wear-resistant steel according to claim 3, wherein the burning loss rate of the added sulfur ore is 30-35%.

Technical Field

The invention relates to the field of metal materials, in particular to a preparation method of wear-resistant and heat-resistant steel.

Background

There are many products of low-alloy wear-resistant steel, but in order to ensure good billet quality and properties, the content (mass percentage) of sulfur element is generally controlled within 3.00% when the steel is manufactured. In order to obtain qualified sulfur-containing elements, alloys with high sulfur content are generally adopted, materials are difficult to find, and ingredients are difficult to control, so that the production cost is extremely high. In addition, the addition of more alloy elements increases the carbon content and affects the material performance, so that even if more alloy elements such as Cr, Ni, Mo and the like are added, the core part of the alloy is difficult to be completely quenched, the hardness difference between the surface and the core part of the manufactured alloy is larger, and the service life of the material is shortened.

The published Chinese utility model patent has the publication number: CN105803339A, patent name: a heat-resistant wear-resistant alloy steel and a preparation method thereof are disclosed in the application date: 20160406, which discloses a heat-resistant wear-resistant alloy steel, which comprises the following components in percentage by weight: c: 0.25-0.35%, Cr: 17-19%, Mn: 17-19%, Si: 0.6-1.2%, Ti: 0.6-1.0%, W: 1.2-2.0%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, Y: 0.05-0.25%, Ce: 0.05-0.25% and Al: 0.025-0.05%, and the balance of Fe. The preparation method of the heat-resistant wear-resistant alloy steel comprises the following steps: charging scrap steel, low-carbon ferrochromium and electrolytic manganese into a furnace for melting; blowing oxygen when the temperature of the molten steel is more than 1580 ℃; 70 percent of aluminum, 20 percent of silicon and 10 percent of calcium wire per ton are inserted into molten steel, 1 percent of carbon, 50 percent of silicon and 49 percent of calcium composite powder are added into the liquid surface for slagging, ferrotitanium and ferrotungsten are added, yttrium-cerium-based mixed rare earth is added into the bottom of a steel ladle, and the tapping temperature is 1620-1640 ℃; the casting pouring temperature is 1530 and 1580 ℃; the heat treatment temperature is 1050-. The invention obtains the heat-strength and high-wear-resistance heat-resistant steel through the optimization design of components and the optimization of melt purification and heat treatment processes.

Disclosure of Invention

The invention aims to provide a preparation method of wear-resistant and heat-resistant steel, which reduces the cost.

The invention relates to wear-resistant heat-resistant steel which is characterized by comprising the following components in percentage by weight: c: 0.24-0.4%, Mn: 9.5-10.5%, Si: 1.5-1.9%, Nb: 0.7-1.20%, V: 0.5-0.8%, Cr: 19-21%, Ni: 5-6%, P: 0-0.045%, S: 0.2-0.3%, and the balance of Fe.

Preferably, the wear-resistant heat-resistant steel is characterized by comprising the following components in percentage by weight: c: 0.3-0.35%, Mn: 9.8-10.3%, Si: 1.7-1.8%, Nb: 0.75-1.0%, V: 0.7-0.75%, Cr: 19.5-20%, Ni: 5.5-5.9%, P: 0.005-0.040%, S: 0.25-0.28% and the balance Fe.

The preparation method of the heat-resistant and wear-resistant steel is characterized by comprising the following steps of:

s1: smelting according to the component proportion to obtain the basic chemical components of the molten steel;

s2: heating and baking the sulfur ore with the sulfur content of 40% at 280-320 ℃ for 25-35 minutes;

s3: adding the sulfur ore into furnace burden for three times;

s4: sampling and sample preparation are carried out after the melting is finished, and qualified tapping and pouring are confirmed.

Preferably, the heating temperature of the charge is 300 ℃.

Preferably, the adding amount of the first sulfur ore is 30 percent, and the molten steel is melted by 80 percent; after the sulfur ore is added into the molten steel, a deslagging agent is immediately added for covering, and the temperature is raised by 30 percent of power.

Preferably, the adding amount of the second sulfur ore is 40 percent, and the molten steel is melted by 90 percent; adding sulfur ore into molten steel at the heating temperature of 300 ℃, adding a deslagging agent to cover and heating at the power of 30%.

Preferably, the adding amount of the sulfur ore for the third time is 30%, and after the sulfur ore is added into the molten steel, the deslagging agent is added to cover and dissolve by 30% power heating.

Preferably, the burning loss rate of the added sulfur ore is 30-35%.

The invention has the beneficial effects that through the idea of smelting high manganese and high sulfur, the high manganese and high sulfur are mutually matched in three time periods at different time periods, no precious alloy element is added, the defect of high production cost caused by adding other alloy elements due to the difficulty of adding sulfur in the prior art is overcome, and the advantages of wear resistance, heat resistance and low cost are met. Through detection, the mechanical properties of the wear-resistant steel provided by the invention are as follows: the ball-milling alloy has the Brinell hardness of 230-285, the tensile strength of more than or equal to 710MPa, the elongation of more than or equal to 16 percent, good heat-resistant and wear-resistant alloy performance, high hardness, high strength, high toughness and the like, and is suitable for various mining machines and engineering machines such as automobiles, bulldozers, loaders, excavators, dump trucks and the like.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The invention is described in detail below, and the description in this section is merely exemplary and explanatory and should not be construed as limiting the scope of the invention in any way.

The invention relates to wear-resistant heat-resistant steel which is characterized by comprising the following components in percentage by weight: c: 0.24-0.4%, Mn: 9.5-10.5%, Si: 1.5-1.9%, Nb: 0.7-1.20%, V: 0.5-0.8%, Cr: 19-21%, Ni: 5-6%, P: 0-0.045%, S: 0.2-0.3%, and the balance of Fe.

In the preferred embodiment, the wear-resistant and heat-resistant steel is characterized by comprising the following components in percentage by weight: c: 0.3-0.35%, Mn: 9.8-10.3%, Si: 1.7-1.8%, Nb: 0.75-1.0%, V: 0.7-0.75%, Cr: 19.5-20%, Ni: 5.5-5.9%, P: 0.005-0.040%, S: 0.25-0.28% and the balance Fe.

The preparation method of the heat-resistant and wear-resistant steel is characterized by comprising the following steps of:

s1: smelting according to the component proportion to obtain the basic chemical components of the molten steel;

s2: heating and baking the sulfur ore with the sulfur content of 40% at 280-320 ℃ for 25-35 minutes;

s3: adding the sulfur ore into furnace burden for three times;

s4: sampling and sample preparation are carried out after the melting is finished, and qualified tapping and pouring are confirmed.

In the embodiment, the heating temperature of the furnace charge is preferably 300 ℃.

In the embodiment, preferably, the adding amount of the first sulfur ore is 30 percent, and the molten steel is melted by 80 percent; after the sulfur ore is added into the molten steel, a deslagging agent is immediately added for covering, and the temperature is raised by 30 percent of power.

In the preferred embodiment, the adding amount of the second sulfur ore is 40 percent, and the molten steel is melted by 90 percent; adding sulfur ore into molten steel at the heating temperature of 300 ℃, adding a deslagging agent to cover and heating at the power of 30%.

In the preferred embodiment, the adding amount of the third sulfur ore is 30%, and after the sulfur ore is added into the molten steel, the slag removing agent is added to cover the molten steel and the molten steel is dissolved by heating with 30% power.

In the embodiment, the burning loss rate of the added sulfur ore is preferably 30 to 35 percent.

It is to be understood that the terms "central," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the indicated orientations and positional relationships and are used merely for convenience in describing and simplifying the present invention, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus are not to be considered limiting of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.