阅读说明：本技术 一种耐腐蚀复合金属材料及其制备方法 (Corrosion-resistant composite metal material and preparation method thereof ) 是由 张聪正 梁晨 于 2020-07-13 设计创作，主要内容包括：本发明提供了一种耐腐蚀复合金属材料,属于金属材料技术领域。包括以下重量份的原料：Ti：0.07～0.15wt％、Nb：0.02～0.03wt％、Zr：0.01～0.02wt％、2205双相不锈钢：99.8～99.9wt％。本发明还提供了一种耐腐蚀复合金属材料的制备方法。本发明基于现有的2205双相不锈钢,加入定量的钛、铌及锆微量元素,具有细化晶粒的作用,可使2205双相不锈钢的耐蚀性能显著的提升,且能够体现出更加的力学性能,避免了2205双相不锈钢在500～1000℃范围时会产生有害析出相,导致不锈钢力学性能下降,而降低耐腐蚀性能。(The invention provides a corrosion-resistant composite metal material, and belongs to the technical field of metal materials. The feed comprises the following raw materials in parts by weight: ti: 0.07 to 0.15 wt%, Nb: 0.02 to 0.03 wt%, Zr: 0.01 to 0.02 wt%, 2205 duplex stainless steel: 99.8 to 99.9 wt%. The invention also provides a preparation method of the corrosion-resistant composite metal material. Based on the existing 2205 duplex stainless steel, the invention adds quantitative titanium, niobium and zirconium microelements, has the function of refining crystal grains, can obviously improve the corrosion resistance of the 2205 duplex stainless steel, can embody more mechanical properties, and avoids that the 2205 duplex stainless steel generates harmful precipitated phases at the temperature of 500-1000 ℃ to reduce the mechanical properties of the stainless steel and further reduce the corrosion resistance.)

1. The corrosion-resistant composite metal material is characterized by comprising the following raw materials in parts by weight: ti: 0.07 to 0.15 wt%, Nb: 0.02 to 0.03 wt%, Zr: 0.01 to 0.02 wt%, 2205 duplex stainless steel: 99.8 to 99.9 wt%.

2. The corrosion-resistant composite metal material according to claim 1, wherein the 2205 duplex stainless steel comprises the following components in percentage by mass: cr: 21.0-23.0 wt%, Ni: 4.5-6.5 wt%, Mo: 2.5-3.5 wt%, Mn: 2.0 wt% or less, Si: less than or equal to 1.0 wt%, N: 0.08-0.2 wt%, P: less than or equal to 0.03 wt%, S: less than or equal to 0.02 wt%, C: less than or equal to 0.03wt percent, and the balance being Fe.

3. A method of making the corrosion resistant composite metal material of claim 1, comprising the steps of:

weighing pure iron and ferrochrome, putting the pure iron and ferrochrome into a medium-frequency induction furnace, electrifying and melting, then sequentially adding metal nickel, metal manganese, chromium nitride, ferrosilicon, ferromolybdenum, ferrotitanium, ferroniobium and ferrozirconium, and continuously melting to form a metal liquid; heating the molten metal to 1550-1600 ℃, and then sequentially carrying out deoxidation treatment and deslagging treatment;

and then pouring the molten metal into a mold, cooling the molten metal to room temperature in an air cooling mode, carrying out solid solution treatment at 1100-1150 ℃ for 3-5 hours, and then cooling the molten metal in a water cooling mode to obtain the corrosion-resistant composite metal material.

4. The method for preparing the corrosion-resistant composite metal material according to claim 3, wherein all the required raw materials are subjected to oil removal, degassing, rust removal and drying treatment before being added into the medium-frequency induction furnace for smelting.

5. The preparation method of the corrosion-resistant composite metal material according to claim 3, wherein a silicon-calcium-manganese deoxidizer is selected in the deoxidation treatment process, and the addition amount of the deoxidizer is 0.2-0.3% of the total weight of the raw materials.

6. The method of claim 3, wherein the required amounts of the raw materials are calculated by Matlab software, wherein the Cr burn-out rate is calculated as 4%, the Si burn-out rate is calculated as 20%, the Mn burn-out rate is calculated as 18%, and the other elements are calculated as no burn-out.

Technical Field

The invention belongs to the technical field of metal materials, and particularly relates to a corrosion-resistant composite metal material and a preparation method thereof.

Background

The solid solution structure of the duplex stainless steel contains ferrite and austenite, has the characteristics of both ferrite and austenite, has excellent corrosion resistance, and plays an important role in various fields of production and life.

The excellent corrosion resistance of the duplex stainless steel is mainly determined by solid solution ferrite, austenite structures and two similar phases, harmful precipitated phases can obviously reduce the corrosion resistance of the duplex stainless steel, and the duplex stainless steel mainly contains abundant alloy elements, and the addition of complex alloy elements such as Cr, Mo and the like can cause the duplex stainless steel to contain two phases of ferrite and austenite and can also generate a plurality of intermetallic harmful precipitated phases under a proper temperature condition.

2205 duplex stainless steel is the most widely used duplex stainless steel at present due to its excellent corrosion resistance and comprehensive mechanical properties. However, 2205 duplex stainless steel can generate harmful precipitated phases in a certain temperature range, which can cause the mechanical property of the stainless steel to be reduced, and more importantly, the precipitated phases can easily cause the corrosion resistance of the stainless steel to be reduced, thereby causing damage to the material.

Disclosure of Invention

The invention aims to provide a corrosion-resistant composite metal material and a preparation method thereof aiming at the defects in the prior art.

The first purpose of the invention is to provide a corrosion-resistant composite metal material, which comprises the following raw materials in parts by weight: ti: 0.07 to 0.15 wt%, Nb: 0.02 to 0.03 wt%, Zr: 0.01 to 0.02 wt%, 2205 duplex stainless steel: 99.8 to 99.9 wt%.

Preferably, the 2205 duplex stainless steel comprises the following components in percentage by mass: cr: 21.0-23.0 wt%, Ni: 4.5-6.5 wt%, Mo: 2.5-3.5 wt%, Mn: 2.0 wt% or less, Si: less than or equal to 1.0 wt%, N: 0.08-0.2 wt%, P: less than or equal to 0.03 wt%, S: less than or equal to 0.02 wt%, C: less than or equal to 0.03wt percent, and the balance being Fe.

The second object of the present invention is to provide a method for preparing a corrosion-resistant composite metal material,

the method comprises the following steps: weighing pure iron and ferrochrome, putting the pure iron and ferrochrome into a medium-frequency induction furnace, electrifying and melting, then sequentially adding metal nickel, metal manganese, chromium nitride, ferrosilicon, ferromolybdenum, ferrotitanium, ferroniobium and ferrozirconium, and continuously melting to form a metal liquid; heating the molten metal to 1550-1600 ℃, and then sequentially carrying out deoxidation treatment and deslagging treatment;

and then pouring the molten metal into a mold, cooling the molten metal to room temperature in an air cooling mode, carrying out solid solution treatment at 1100-1150 ℃ for 3-5 hours, and then cooling the molten metal in a water cooling mode to obtain the corrosion-resistant composite metal material.

Preferably, all the required raw materials are subjected to oil removal, degassing, rust removal and drying treatment before being added into the medium-frequency induction furnace for smelting.

Preferably, a silicon-calcium-manganese deoxidizer is selected in the deoxidation treatment process, and the addition amount of the deoxidizer is 0.2-0.3% of the total weight of the raw materials.

Preferably, the required raw material usage is calculated by Matlab software, wherein the Cr burning loss rate is calculated according to 4%, the Si burning loss rate is calculated according to 20%, the Mn burning loss rate is calculated according to 18%, and other elements are calculated according to no burning loss.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a corrosion-resistant composite metal material, which is based on the existing 2205 duplex stainless steel, is added with quantitative titanium, niobium and zirconium microelements, has the function of refining crystal grains, can obviously improve the corrosion resistance of the 2205 duplex stainless steel, and avoids that the mechanical property of the stainless steel is reduced and the corrosion resistance is reduced because harmful precipitated phases are generated in the 2205 duplex stainless steel at the temperature of 500-1000 ℃. Meanwhile, the mechanical property of 2205 duplex stainless steel can be effectively improved.

Detailed Description

In order to make the technical solutions of the present invention better understood and enable those skilled in the art to practice the present invention, the following embodiments are further described, but the present invention is not limited to the following embodiments.

The 2205 duplex stainless steel used in the following examples has a composition and mass percentages of 22.36 wt% Cr, 5.21 wt% Ni, 3.18 wt% Mo, 1.37 wt% Mn, 0.65 wt% Si, 0.15 wt% N, 0.014 wt% P, 0.0008 wt% S, 0.03 wt% C, and the balance Fe; meanwhile, the required raw material usage is calculated by Matlab software, wherein the Cr burning loss rate is calculated according to 4%, the Si burning loss rate is calculated according to 20%, the Mn burning loss rate is calculated according to 18%, and other elements are calculated according to no burning loss.