CN117467911A

CN117467911A - Corrosion-resistant wear-resistant steel plate and manufacturing method thereof

Info

Publication number: CN117467911A
Application number: CN202310951052.6A
Authority: CN
Inventors: 李红斌; 丁建华; 苗雨川; 刘自成; 梅峰
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2022-07-29
Filing date: 2023-07-31
Publication date: 2024-01-30
Also published as: WO2024022531A1

Abstract

The present disclosure discloses a corrosion-resistant and wear-resistant steel sheet and a method of manufacturing the same. The steel plate comprises the following components in percentage by weight: c is more than or equal to 0.15 percent and less than or equal to 0.25 percent; si is more than or equal to 0.10 percent and less than or equal to 0.50 percent; mn is more than or equal to 0.50 percent and less than or equal to 1.50 percent; mo is more than or equal to 0.01 percent and less than or equal to 0.50 percent; nb is more than or equal to 0.005 percent and less than or equal to 0.050 percent; v is more than or equal to 0.01% and less than or equal to 0.10%; ti is more than or equal to 0.005% and less than or equal to 0.050%; al is more than or equal to 0.010 percent and less than or equal to 0.060 percent; cr is 2.00 percent or more and is 5.00 percent or less; b:0.0005 to 0.0050wt.%; p: p is more than or equal to 0.010% and less than or equal to 0.030%, and in addition, the method further comprises the following steps: cu is more than or equal to 0.10 and less than or equal to 0.40 percent, ni is more than or equal to 0.20 and less than or equal to 1.00 percent, RE is more than or equal to 0.01 and less than or equal to 0.10 percent, sb: more than one of 0.01 percent and less than or equal to 0.20 percent of Sb, and the balance of Fe and unavoidable impurities, and the manufacturing method of the steel plate comprises the following steps: (1) a smelting and casting step; (2) a heating step; (3) a rolling step; (4) an on-line cooling step. The steel sheet of the present disclosure combines excellent acid resistance, alkali resistance and wear resistance.

Description

Corrosion-resistant wear-resistant steel plate and manufacturing method thereof

Technical Field

The present disclosure relates to a steel sheet and a method of manufacturing the same, and more particularly, to a corrosion-resistant and wear-resistant steel sheet and a method of manufacturing the same.

Background

The working conditions of mechanical equipment such as engineering, mining, cement production, harbors, electric power, metallurgy and the like are particularly severe, and products such as scraper conveyors, dumper boxes and the like are required to have high strength, high hardness and high toughness. However, in some special working conditions, such as treatment of industrial waste and other wear-resistant equipment, the service life is very short, which is mainly due to corrosion and decay of the waste, which causes corrosion of the equipment and further shortens the service life.

Currently, studies on acid-resistant steel sheets, for example, patent application No. 201480021680.3, entitled "steel sheet for thick-wall high-strength line pipe and line pipe excellent in acid resistance, fracture resistance and low-temperature toughness", have been conducted, and it is intended to provide a steel sheet for thick-wall high-strength line pipe excellent in acid resistance, fracture resistance and low-temperature toughness, which has only acid resistance, and a method for producing the same.

In addition, studies on alkali-resistant steel sheets are underway, for example, patent application No. 201010168491.2 entitled "alkali-soil corrosion-resistant steel for hot-rolled U-shaped steel sheet pile and production method thereof", which provides an alkali-soil corrosion-resistant steel for hot-rolled U-shaped steel sheet pile and production method thereof, but the steel sheet has alkali resistance only.

However, there is no steel sheet which is resistant to alkali and acid and has excellent wear resistance against environmental changes.

In view of the above-mentioned drawbacks of the prior art, it is desirable to obtain a low-carbon low-alloy steel sheet that combines corrosion resistance and wear resistance, while ensuring excellent wear resistance of the material, and also has excellent acid resistance and alkali resistance, and can reduce manufacturing costs, and is suitable for mass production.

Disclosure of Invention

The aim of the present disclosure is to provide a corrosion-resistant and wear-resistant steel plate and a manufacturing method thereof, wherein the corrosion-resistant and wear-resistant dry plate has excellent wear resistance, acid resistance and alkali resistance, can meet the requirements of the steel plate on the wear resistance and the corrosion resistance of the steel plate under the particularly severe working condition, and reduces the manufacturing cost.

In order to achieve the above object, the present disclosure provides a corrosion-resistant and wear-resistant steel sheet comprising, in weight percent:

C：0.10％≤C≤0.30％；

Si：0.10％≤Si≤0.50％；

Mn：0.50％≤Mn≤1.50％；

Mo：0.01％≤Mo≤0.50％；

Nb：0.005％≤Nb≤0.050％；

V：0.01％≤V≤0.10％；

Ti：0.005％≤Ti≤0.050％；

Al：0.010％≤Al≤0.060％；

Cr：2.00％≤Cr≤5.00％；

B：0.0005％≤B≤0.0050％；

Sb：0.01％≤Sb≤0.20％；

P：0.010％≤P≤0.030％；

in addition, it also includes: cu is more than or equal to 0.10 and less than or equal to 0.40 percent, ni is more than or equal to 0.20 and less than or equal to 1.00 percent, RE is more than or equal to 0.01 and less than or equal to 0.10 percent, and the balance is Fe and unavoidable impurities.

Another embodiment of the present disclosure is a corrosion-resistant and wear-resistant steel sheet characterized by comprising, in weight percent, fe and unavoidable impurities:

C：0.10％≤C≤0.30％；

Si：0.10％≤Si≤0.50％；

Mn：0.50％≤Mn≤1.50％；

Mo：0.01％≤Mo≤0.50％；

Nb：0.005％≤Nb≤0.050％；

V：0.01％≤V≤0.10％；

Ti：0.005％≤Ti≤0.050％；

Al：0.010％≤Al≤0.060％；

Cr：2.00％≤Cr≤5.00％；

B：0.0005％≤B≤0.0050％；

Sb：0.01％≤Sb≤0.20％；

P：0.010％≤P≤0.030％；

also comprises: more than one of Cu more than or equal to 0.10% and less than or equal to 0.40%, ni more than or equal to 0.20% and less than or equal to 1.00% and RE more than or equal to 0.01% and less than or equal to 0.10%.

In some embodiments, the corrosion resistant wear resistant steel sheet of the present disclosure comprises, in weight percent: c is more than or equal to 0.15 percent and less than or equal to 0.25 percent; si is more than or equal to 0.10 percent and less than or equal to 0.50 percent; mn is more than or equal to 0.50 percent and less than or equal to 1.50 percent; mo is more than or equal to 0.01 percent and less than or equal to 0.50 percent; nb is more than or equal to 0.005 percent and less than or equal to 0.050 percent; v is more than or equal to 0.01% and less than or equal to 0.10%; ti is more than or equal to 0.005% and less than or equal to 0.050%; al is more than or equal to 0.010 percent and less than or equal to 0.060 percent; cr is 2.00 percent or more and is 5.00 percent or less; b is more than or equal to 0.0005 percent and less than or equal to 0.0050 percent; and P: p is more than or equal to 0.010% and less than or equal to 0.030%; also comprises: cu is more than or equal to 0.10 and less than or equal to 0.40 percent, ni is more than or equal to 0.20 and less than or equal to 1.00 percent, RE is more than or equal to 0.01 and less than or equal to 0.10 percent and Sb: more than one of 0.01% or more and 0.20% or less of Sb, and the balance of Fe and unavoidable impurities.

In some embodiments, the corrosion resistant wear resistant steel sheet of the present invention comprises, in weight percent:

C：0.10％≤C≤0.30％；

Si：0.25％≤Si≤0.45％；

Mn：0.65％≤Mn≤1.50％；

Mo：0.10％≤Mo≤0.35％；

Nb：0.01％≤Nb≤0.045％；

V：0.01％≤V≤0.08％；

Ti：0.010％≤Ti≤0.045％；

Al：0.020％≤Al≤0.050％；

Cr：2.30％≤Cr≤4.60％；

B：0.0015％≤B≤0.0040％；

Sb：0.06％≤Sb≤0.19％；

P：0.010％≤P≤0.016％；

S：≤0.005％；

Cu：≤0.35％；

Ni：≤0.75％；

RE：≤0.10％；

the balance being Fe and unavoidable impurities.

Further, in the steel sheet of the present disclosure, the following weight percentages are:

0.10≤Mo≤0.40％；

0.010％≤Nb≤0.045％；

0.02％≤V≤0.10％；

0.015％≤Ti≤0.050％。

2.50％≤Cr≤5.00％；

0.012％≤P≤0.030％；

0.12％≤Cu≤0.40％；

0.20％≤Ni≤0.90％。

further, in the steel sheet of the present disclosure, S in the unavoidable impurities is as follows: <0.010%.

In the corrosion-resistant and wear-resistant steel sheet of the present disclosure, the design principle of each chemical element is specifically as follows (the following contents are all in mass percent):

carbon (C): carbon is the most basic and important element in wear-resistant steel, and can improve the strength and hardness of the steel, so that the wear resistance of the steel is improved, but the carbon is unfavorable for the toughness and welding performance of the steel. Thus, the content of carbon is controlled to 0.10.ltoreq.C.ltoreq.0.30% in the present disclosure, more preferably 0.12.ltoreq.C.ltoreq.0.29%.

Silicon (Si): silicon is solid-dissolved in ferrite and austenite to improve their hardness and strength, whereas too high a silicon content causes a sharp decrease in toughness of the steel. Meanwhile, considering that the affinity of silicon and oxygen is stronger than that of iron, silicate with low melting point is easy to generate during welding, the fluidity of slag and molten metal is increased, and the quality of a welding seam is affected, so that the content is not excessive. The Si content is controlled to be 0.10% or less and 0.50% or less, and more preferably 0.15% or less and 0.50% or less. In some embodiments, the silicon content is controlled to 0.25% Si.ltoreq.0.45%.

Manganese (Mn): manganese strongly increases the hardenability of the steel, reducing the transformation temperature of the wear-resistant steel and the critical cooling rate of the steel. However, when the manganese content is high, the crystal grains tend to coarsen, the tempering embrittlement sensitivity of the steel is increased, segregation and cracks are easily caused in a cast blank, and the performance of the steel sheet is lowered. The Mn content is controlled to be 0.50% or less and Mn 1.50% or less, and more preferably 0.60% or less and Mn 1.50% or less. In some embodiments, the manganese content is controlled to 0.65% Mn 1.50%.

Molybdenum: the molybdenum can refine grains and improve strength and toughness. Molybdenum exists in the steel in a solid solution phase and a carbide phase, and therefore, the molybdenum-containing steel has both solid solution strengthening and carbide dispersion strengthening effects. Molybdenum is an element for reducing temper brittleness, and can improve temper stability. The content of Mo is controlled to be 0.01% or more and 0.50% or less, and more preferably 0.10% or less and 0.40% or less.

Niobium (Nb): the refined grains and precipitation strengthening effect of Nb are extremely remarkable in improving the toughness of the material, are strong C, N compound forming elements, and strongly inhibit the growth of austenite grains. Nb improves and enhances the properties of steel through grain refinement while enhancing the strength and toughness of steel, mainly through precipitation strengthening and phase transformation strengthening, and has been used as one of the most effective strengthening agents in HSLA steel. Thus, nb is controlled to 0.005% or less than or equal to Nb 0.050% or less, and more preferably 0.010% or less than or equal to Nb 0.045%.

Vanadium (V): the vanadium is mainly added to refine grains, so that austenite grains of the steel billet are not too coarse during the heating stage, and thus, the grains of the steel can be further refined during the subsequent multi-pass rolling process, and the strength and toughness of the steel are improved. Therefore, the vanadium content is controlled to be 0.01% or less and 0.10% or less, and more preferably 0.02% or less and 0.10% or less. In some embodiments, the vanadium content is controlled to 0.01% V.ltoreq.0.08%.

Titanium (Ti): titanium is one of the strong carbide-forming elements and forms fine TiC particles with carbon. TiC particles are fine and distributed in grain boundaries, so that the effect of grain refinement is achieved, and the harder TiC particles improve the wear resistance of the steel. Therefore, the content of titanium is controlled to be 0.005% or less and Ti 0.050% or less, and more preferably 0.015% or less and < Ti 0.050% or less.

Aluminum (Al): the nitrogen in the aluminum and steel can form tiny indissolvable AlN particles, so as to refine the crystal grains of the steel. Aluminum can refine the grains of the steel, fix nitrogen and oxygen in the steel, lighten the sensitivity of the steel to gaps, reduce or eliminate the aging phenomenon of the steel, and improve the toughness of the steel. Therefore, the content of aluminum is controlled to 0.010% or less Al or less than 0.060%, more preferably 0.015% or less Al or less than 0.060%. In some embodiments, the aluminum content is controlled to 0.02% V.ltoreq.0.05%.

Chromium (Cr): chromium can reduce critical cooling rate and improve hardenability of steel. Chromium can be formed in steel (Fe, cr) ₃ C、(Fe，Cr) ₇ C ₃ And (Fe, cr) ₂₃ C ₇ And multiple carbides, improving strength andhardness. Chromium can prevent or slow down the precipitation and aggregation of carbide during tempering, and can improve the tempering stability of steel. In addition, it can improve the acid corrosion resistance of steel. In the oxidizing medium, there is an oxide of chromium which forms a layer of firm and dense on the surface of the steel, so that the steel is protected. Chromium is dissolved in steel, so that the electrode potential of the steel can be obviously improved, and electrochemical corrosion caused by different electrode potentials is reduced. Thus, the content of chromium is controlled to 2.00% or less and 5.00% or less of Cr, and more preferably 2.50% or less and 5.00% or less of Cr.

Boron (B): boron increases the hardenability of steel but excessively high content causes hot embrittlement phenomenon, affecting the weldability and hot workability of steel, so that it is necessary to strictly control the B content. Therefore, the boron content is controlled to be 0.0005% B.ltoreq.0.0050%, more preferably 0.0008% B.ltoreq.0.0050%. In some embodiments, the boron content is controlled to 0.0015% B.ltoreq.0.0040%.

Antimony (Sb): antimony can increase the acid corrosion resistance of steel and increase the hardness of the alloy. In an acidic environment, passivation occurs due to dissolution, and a passivation layer rich in alloy elements such as Sb is formed on the surface of steel, so that the steel has high acid corrosion resistance. Therefore, the content of Sb is controlled to be 0.01% or less and 0.20% or less, and more preferably 0.03% or less and 0.20% or less. In some embodiments, the antimony content is controlled to 0.05% Sb.ltoreq.0.20%.

Copper (Cu): the solid solution state and the single phase precipitation state exist in the steel, and the solid solution Cu plays a solid solution strengthening role; since the solid solubility of Cu in ferrite decreases rapidly with decreasing temperature, cu in supersaturated solid solution is precipitated in the form of simple substance at lower temperature, which plays a role of precipitation strengthening. Meanwhile, cu is added into the steel, so that the atmospheric corrosion resistance of the steel can be obviously improved, and the effect is particularly obvious when the steel coexists with phosphorus. Therefore, when copper is added, the copper content can be controlled to 0.10% or less than or equal to 0.40% or less of Cu, and more preferably 0.12% or less than or equal to 0.40% or less of Cu. The content of phosphorus element is controlled to be 0.010% or less and P0.030% or less, and more preferably 0.012% or less and P0.030% or less.

Nickel (Ni): nickel has the effect of obviously reducing the cold-embrittlement transition temperature, but the excessive content is easy to cause that the oxide scale on the surface of the steel plate is difficult to fall off, and the cost is obviously increased. Therefore, when nickel is added, the content of nickel is controlled to 0.20% or less Ni 1.00% or less, and more preferably 0.45% or less Ni 0.8% or less.

Rare Earth (RE): the rare earth is added into the steel to reduce segregation of elements such as sulfur, phosphorus and the like, improve the shape, the size and the distribution of nonmetallic inclusions, refine grains and improve the ultra-high hardness. In addition, rare earth can improve corrosion resistance of steel. The rare earth content is not excessive, otherwise serious segregation can be generated, and the quality and mechanical property of the casting blank are reduced. Thus, RE content is controlled to be 0.01% or less and RE 0.10% or less, more preferably 0.02% or less and RE 0.90% or less.

Sulfur: sulfur is a harmful element, the content is strictly controlled, and the sulfur content S in the steel grade is controlled to be less than or equal to 0.010 percent.

Further, the steel sheet of the present disclosure has a Brinell hardness of 350 to 520HBW, such as 350 to 500HBW. In some embodiments, the steel sheet of the present disclosure has a brinell hardness of 370 to 520HBW.

Further, the steel sheet of the present disclosure comprises lath martensite structure, bainite, and residual austenite, wherein the volume fraction of the bainite is 10 to 40%, and the volume fraction of the residual austenite is 5 to 15%.

Further, the thickness of the steel sheet of the present disclosure is 15 to 40mm.

A second aspect of the present disclosure is a method for manufacturing a corrosion-resistant and wear-resistant steel sheet, comprising the steps of:

(1) Smelting and casting;

(2) A heating step;

(3) A rolling step;

(4) And (5) an online cooling step.

In the manufacturing method of the corrosion-resistant and wear-resistant steel plate, in the heating step (2), the heating temperature of a plate blank is 1000-1200 ℃, and the heat is preserved for 1-3 hours; in the rolling step (3), the initial rolling temperature of rough rolling is 900-1150 ℃ (such as 1000-1100 ℃), and the final rolling temperature of finish rolling is 780-880 ℃ (such as 810-870 ℃); in the (4) online cooling step, the cooling mode can be water cooling, the water cooling can be carried out to below 350 ℃ (such as 150-350 ℃), then the air cooling is carried out to room temperature, and the cooling speed of the water cooling can be 15-50 ℃/s.

Further, in the steel sheet of the present disclosure, the finish rolling deformation ratio of the steel sheet is 60 to 80%.

Advantageous effects

The corrosion-resistant and wear-resistant steel sheet and the manufacturing method thereof of the present disclosure have the following advantages and beneficial effects as compared with the prior art:

the corrosion-resistant and wear-resistant steel plate has obvious advantages, is excellent in acid resistance and wear resistance by controlling the content of carbon and alloy elements and each heat treatment process, and is low in cost, simple in process, high in strength and hardness, excellent in machining performance, easy to weld and excellent in acid corrosion resistance, and specifically:

1. from the aspect of chemical components, the alloy components of the corrosion-resistant and wear-resistant steel plate mainly comprise low-carbon low-alloy, the characteristics of refinement, reinforcement and the like of Cr, mo, ni, cu, nb, ti and other alloy elements are fully utilized, the steel plate is guaranteed to have good mechanical properties, good corrosion resistance and the like, and the corrosion-resistant and wear-resistant steel plate has the advantages of high strength, high hardness, excellent acid resistance, alkali resistance and the like, and has good welding performance.

2. From the aspect of production technology, the corrosion-resistant and wear-resistant steel plate improves the structure refinement and strengthening effects by controlling the technological parameters such as the start and finish rolling temperature, the finish rolling deformation rate, the cooling speed and the like in the manufacturing method, further reduces the content of carbon and alloy elements, and obtains the steel plate with excellent mechanical properties, welding properties and the like. In addition, the process has the characteristics of short production flow, high efficiency, energy conservation, low cost and the like.

3. The corrosion-resistant wear-resistant steel plate disclosed by the invention fully utilizes the alloying element addition and the controlled rolling and cooling process to obtain lath martensite structure and residual austenite, and is beneficial to the good matching of the strength, hardness and toughness of the wear-resistant steel plate. The higher the residual austenite content, the higher the self-corrosion potential, the lower the residual austenite content, and the lower the self-corrosion potential, the increase of the residual austenite contributes to the improvement of the corrosion resistance of the material.

Drawings

Fig. 1 is a metallographic structure diagram of a steel sheet of the present disclosure.

Detailed Description

Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which is a description of specific embodiments. While the description of the present disclosure will be presented in connection with the preferred embodiments, it is not intended to limit the features of the invention to the implementation. Rather, the invention has been described in connection with specific embodiments, and is intended to cover other alternatives or modifications, which may be extended by the claims based on this disclosure. The following description will contain numerous specific details in order to provide a thorough understanding of the present disclosure. The present disclosure may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the focus of the disclosure.

Examples 1 to 8 and comparative example 1

Table 1 shows the mass percentages of the chemical elements corresponding to the corrosion-resistant and wear-resistant steel sheets of examples 1 to 8 and comparative example 1.

Table 1: chemical composition (wt.%) of examples 1-8 and comparative example 1

The corrosion-resistant and wear-resistant steel plates in examples 1 to 8 of the present disclosure are prepared by the following steps:

the manufacturing method of the wear resistant steel plates of examples 1 to 8 is:

(1) Smelting, casting, heating, rolling, online quenching and the like;

(2) Heating, namely heating the plate blank at the temperature of 1000-1200 ℃ and preserving heat for 1-3 hours;

(3) A rolling step, wherein the initial rolling temperature of rough rolling is 900-1150 ℃ and the final rolling temperature of finish rolling is 780-880 ℃;

(4) And (3) performing online cooling and the like, wherein water cooling is adopted to cool to below 350 ℃ (the cooling stop temperature) and then air cooling is performed to room temperature, and the water cooling speed is 15-50 ℃/s.

The abrasion-resistant steel sheet of comparative example 1 was produced in the same manner as described above, except that the raw material composition and specific process parameters in each step were different from those of examples 1 to 8. The specific process parameters of examples 1 to 8 and comparative example 1 are shown in Table 2.

Table 2: specific process parameters in examples 1 to 8 and comparative example 1

The corrosion-resistant and abrasion-resistant steel sheets of examples 1 to 8 and comparative example 1 were subjected to an acid resistance test, an alkali resistance test, and a mechanical property test, and the test results obtained are shown in tables 3 to 5.

The acid resistance testing method comprises the following steps: adopting a constant temperature test tank, and heating at 23+ -2deg.C and 10% H ₂ SO ₄ Corrosion tests were performed in a +3.5% NaCl, full immersion for 24 hours ". The specific method refers to a method for uniform corrosion full immersion test in a JB/T7901-2001 metal material laboratory;

the alkali resistance testing method comprises the following steps: performing a week leaching experiment under an alkaline atmosphere, wherein the experiment temperature is 45+/-2 ℃, the relative humidity is 70+/-5%, and the week leaching speed is as follows: 1/60 (cycles/min), pH 9.5;

brinell hardness test: brinell hardness test was performed according to GB/T231.1 standard using a SCL246 Brinell hardness tester at room temperature. Hardness tests were conducted on the surface positions of the abrasion resistant steel samples of examples 1 to 8 and comparative example 1, respectively, to obtain corresponding brinell hardness.

Table 3: corrosion Properties of examples 1 to 8 and comparative example 1

Examples/comparative example numbering	Test time, h	Acid corrosion rate, g/(m) ² ·h)
			Example 1	24	0.31
Example 2	24	0.33
			Example 3	24	0.30
Example 4	24	0.28
			Example 5	24	0.35
Example 6	24	0.23
			Example 7	24	0.26
Example 8	24	0.22
			Comparative example 1	24	3.51

Table 4: alkali resistance Corrosion Properties of examples 1 to 8 and comparative example 1

Table 5: mechanical Properties of examples 1 to 8 and comparative example 1

Examples/comparative example numbering	Hardness, HBW
		Example 1	375
Example 2	416
		Example 3	426
Example 4	449
		Example 5	440
Example 6	463
		Example 7	495
Example 8	513
		Comparative example 1	235

As can be seen from tables 1 to 5, the acid corrosion rates of the steel sheets of examples 1 to 8 obtained by optimizing the chemical elements and controlling the manufacturing process were only 0.33 g/(m) at maximum ² H) the alkali corrosion rate is only 0.51 g/(m) at maximum ² H) the Hardness (HBW) is also at a minimum of 375. Chemical element and production method of comparative example 1 unlike the present invention, the acid etching rate of comparative example 1 was 3.51 g/(m) ² H) the alkali corrosion rate was 2.56 g/(m) ² H) Hardness (HBW) was 235. The steel sheet of comparative example 1 has much higher acid corrosion rate and alkali corrosion rate than the steel sheet of the present invention, i.e., is inferior in acid resistance and alkali resistance, and also inferior in hardness. Namely, the acid resistance and the alkali resistance of the steel plate obtained by optimizing chemical elements and controlling the manufacturing process are greatly improved. The wear-resistant steel plate has excellent acid resistance and alkali resistance, and has a hardness HBW of more than 375.

In summary, it can be seen that the steel plate disclosed by the disclosure has excellent acid resistance, alkali resistance and wear resistance through reasonable chemical composition design and combination of optimization process, and the production process is simple, can be used for severe working environment, prolongs service life, and has wide application prospect.

It should be noted that the prior art part in the protection scope of the present disclosure is not limited to the embodiments set forth in the present application, and all prior art that does not contradict the scheme of the present disclosure, including but not limited to the prior patent document, the prior publication, the prior public use, etc., can be included in the protection scope of the present disclosure. In addition, the combination of the features described in the present application is not limited to the combination described in the claims or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradiction occurs between them.

It should also be noted that the above-recited embodiments are merely specific examples of the present disclosure. It is apparent that the present disclosure is not limited to the above embodiments, and similar changes or modifications may be made thereto, which may be directly or easily suggested to one skilled in the art from the present disclosure, should fall within the scope of the present disclosure.

Claims

1. A corrosion resistant and wear resistant steel sheet comprising, in weight percent: c is more than or equal to 0.15 percent and less than or equal to 0.25 percent; si is more than or equal to 0.10 percent and less than or equal to 0.50 percent; mn is more than or equal to 0.50 percent and less than or equal to 1.50 percent; mo is more than or equal to 0.01 percent and less than or equal to 0.50 percent; nb is more than or equal to 0.005 percent and less than or equal to 0.050 percent; v is more than or equal to 0.01% and less than or equal to 0.10%; ti is more than or equal to 0.005% and less than or equal to 0.050%; al is more than or equal to 0.010 percent and less than or equal to 0.060 percent; cr is 2.00 percent or more and is 5.00 percent or less; b is more than or equal to 0.0005 percent and less than or equal to 0.0050 percent; and P: p is more than or equal to 0.010% and less than or equal to 0.030%; also comprises: cu is more than or equal to 0.10 and less than or equal to 0.40 percent, ni is more than or equal to 0.20 and less than or equal to 1.00 percent, RE is more than or equal to 0.01 and less than or equal to 0.10 percent and Sb: more than one of 0.01% or more and 0.20% or less of Sb, and the balance of Fe and unavoidable impurities.

2. A corrosion-resistant and wear-resistant steel sheet characterized by comprising, in weight percent, fe and unavoidable impurities: c is more than or equal to 0.10 percent and less than or equal to 0.30 percent; si is more than or equal to 0.10% and less than or equal to 0.50%; mn is more than or equal to 0.50% and less than or equal to 1.50%; mo is more than or equal to 0.01% and less than or equal to 0.50%; nb is more than or equal to 0.005% and less than or equal to 0.050%; v is more than or equal to 0.01% and less than or equal to 0.10%; ti is more than or equal to 0.005% and less than or equal to 0.050%; al is more than or equal to 0.010% and less than or equal to 0.060%; cr is more than or equal to 2.00% and less than or equal to 5.00%; b is more than or equal to 0.0005% and less than or equal to 0.0050%; and P: p is more than or equal to 0.010% and less than or equal to 0.030%; also comprises: cu is more than or equal to 0.10 and less than or equal to 0.40 percent, ni is more than or equal to 0.20 and less than or equal to 1.00 percent, RE is more than or equal to 0.01 and less than or equal to 0.10 percent and Sb: more than one of 0.01 percent and less than or equal to 0.20 percent of Sb.

3. A corrosion resistant and wear resistant steel sheet, comprising, in weight percent: c: c is more than or equal to 0.10 percent and less than or equal to 0.30 percent; si: si is more than or equal to 0.10% and less than or equal to 0.50%; mn: mn is more than or equal to 0.50% and less than or equal to 1.50%; mo: mo is more than or equal to 0.01% and less than or equal to 0.50%; nb: nb is more than or equal to 0.005% and less than or equal to 0.050%; v: v is more than or equal to 0.01% and less than or equal to 0.10%; ti: ti is more than or equal to 0.005% and less than or equal to 0.050%; al: al is more than or equal to 0.010% and less than or equal to 0.060%; cr: cr is more than or equal to 2.00% and less than or equal to 5.00%; b: b is more than or equal to 0.0005% and less than or equal to 0.0050%; sb: sb is more than or equal to 0.01% and less than or equal to 0.20%; p: p is more than or equal to 0.010% and less than or equal to 0.030%; also comprises: cu is more than or equal to 0.10 and less than or equal to 0.40 percent, ni is more than or equal to 0.20 and less than or equal to 1.00 percent, RE is more than or equal to 0.01 and less than or equal to 0.10 percent, and the balance is Fe and unavoidable impurities.

4. A corrosion resistant wear resistant steel sheet according to any one of claims 1 to 3, wherein, in weight percent: mo is more than or equal to 0.10 and less than or equal to 0.40 percent; nb is more than or equal to 0.010 percent and less than or equal to 0.045 percent; v is more than or equal to 0.02% and less than or equal to 0.10%; ti is more than or equal to 0.015% and less than or equal to 0.050%.

5. A corrosion resistant wear resistant steel sheet according to any one of claims 1 to 3, wherein, in weight percent: cr is more than or equal to 2.50% and less than or equal to 5.00%; p is more than or equal to 0.012 percent and less than or equal to 0.030 percent; cu is more than or equal to 0.12 and less than or equal to 0.40 percent; ni is more than or equal to 0.20 and less than or equal to 0.90 percent.

6. A corrosion-resistant and wear-resistant steel sheet according to any one of claims 1 to 3, wherein the unavoidable impurities are S: <0.010%.

7. A corrosion resistant wear resistant steel sheet according to any one of claims 1 to 3, wherein, in weight percent: b is more than or equal to 0.0015 percent and less than or equal to 0.0040 percent.

8. Corrosion-resistant and wear-resistant steel sheet according to any one of claims 1 to 7, wherein the steel sheet has a brinell hardness of 350 to 520HBW, preferably 350 to 500HBW.

9. The corrosion-resistant and wear-resistant steel sheet according to any one of claims 1 to 8, wherein the steel sheet comprises a lath martensitic structure, bainite, and retained austenite, wherein the volume fraction of the bainite is 10 to 40%, and the volume fraction of the retained austenite is 5 to 15%.

10. The method for producing a corrosion-resistant and wear-resistant steel sheet according to any one of claims 1 to 9, comprising:

(1) Smelting and casting;

(2) A heating step;

(3) A rolling step, wherein the finish rolling temperature is 780-880 ℃;

(4) And (5) an online cooling step.

11. The method of producing a corrosion-resistant and wear-resistant steel sheet according to claim 10, wherein in the in-line cooling step (4), the steel sheet is cooled by water cooling at a cooling rate of 15 to 50 ℃/s.

12. The method for producing a corrosion-resistant and wear-resistant steel sheet according to claim 10, wherein in said (2) heating step, the slab heating temperature is 1000 to 1200 ℃, and the heat is preserved for 1 to 3 hours; in the online cooling step (4), the water cooling is carried out to below 350 ℃ and then the air cooling is carried out to the room temperature.

13. The method of producing a corrosion-resistant and wear-resistant steel sheet according to claim 10, wherein the finish rolling deformation ratio of the steel sheet is 60% to 80%.

14. The method for producing a corrosion-resistant and wear-resistant steel sheet according to claim 10, wherein in the step (3), the rough rolling start temperature is 900 to 1150 ℃.

15. The method of producing a corrosion-resistant and wear-resistant steel sheet according to claim 12, wherein (4) in the in-line cooling step, the steel sheet is cooled to 150 to 350 ℃ by water cooling and then cooled to room temperature by air cooling.