CN104711480A - Dedicated wear-resisting anticorrosion steel plate for storage rack platform and preparation method of steel plate - Google Patents

Abstract

The invention discloses a dedicated wear-resisting anticorrosion steel plate for a storage rack platform and a preparation method of the steel plate. The steel plate comprises the following components by mass percent: 0.28-0.31% of C, 0.45-0.47% of Mn, 0.09-0.12% of Si, 0.006-0.008% of P, S less than or equal to 0.004%, 0.07-0.09% of V, 0.08-0.12% of Ti, 0.10-0.13% of Al, N less than or equal to 0.006%, 0.012-0.015% of Cu, 0.4-0.6% of Cr, 0.33-0.36% of Mo, 0.015-0.032% of rare earth trace elements, and the balance of Fe and unavoidable impurities; the rare earth trace elements comprise the following chemical components in mass percent: 8-12% of Nd, 11-16% of Ce, 3-5% of Er, 2-6% of Pr, 1-4% of Pm, 0-5% of Dy, and the balance of La. The preparation method of the steel plate disclosed by the invention can be used for achieving a reasonable two-phase ratio, small ferrites and dispersed pearlites, avoids banded structures, and further improves the acid resistance due to lack of the banded structures.

Description

A kind of shelf platform-specific Wear-resistant corrosion-resistant steel plate and preparation method thereof

Technical field

The present invention relates to a kind of steel plate and preparation method thereof, specifically a kind of shelf platform-specific Wear-resistant corrosion-resistant steel plate and preparation method thereof.

Background technology

Shelf platform builds a steel platform and pallets and platforms at heavy weight shelving top in the steel construction of one, needs are deposited for special material, working conditions and the environment of shelf are more and more harsher, more and more thicker to the thickness requirement of steel plate, correspondingly the technical requirements of the steel plate for storage facilities is also improved constantly.Especially for when depositing some corrosive cargos, usually can the column of humus body panel and loading steel plate, cause storage facilities just to damage at short notice, add warehouse cost.Therefore the Wear-resistant corrosion-resistant performance how effectively improving shelf steel is those skilled in the art's technical issues that need to address always.

Summary of the invention

Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of shelf platform-specific Wear-resistant corrosion-resistant steel plate and preparation method thereof, makes the steel plate produced have good wear resistance and corrosion resistance.

The technical scheme that the present invention solves above technical problem is: provide a kind of shelf platform-specific Wear-resistant corrosion-resistant steel plate, the composition of this steel plate and mass percent are: C:0.28-0.31%, Mn:0.45-0.47%, Si:0.09-0.12%, P:0.006-0.008%, S≤0.004%, V:0.07-0.09%, Ti:0.08-0.12%, Al:0.10-0.13%, N≤0.006%, Cu:0.012-0.015%, Cr:0.4-0.6%, Mo:0.33-0.36%, rare earth microelement: 0.015-0.032%, and surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:8-12%, Ce:11-16%, Er:3-5%, Pr:2-6%, Pm:1-4%, Dy:0-5%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, and at thickness place, surface to 1/4, second-phase percent by volume is 2.7-2.9%, and 1/4 thickness is 7.0-7.5% to center second-phase percent by volume, and without banded structure;

This steel plate is 3.2-3.4 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.2-5.6 μm, and 1/4 thickness is 4.8-5.1 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.0-7.3 μm.

The technical scheme that the present invention limits further is: aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, the composition of this steel plate and mass percent are: C:0.28%, Mn:0.45%, Si:0.09%, P:0.006%, S≤0.004%, V:0.07%, Ti:0.08-0.12%, Al:0.10%, N≤0.006%, Cu:0.012%, Cr:0.4%, Mo:0.33%, rare earth microelement: 0.015%, and surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:8-%, Ce:11%, Er:3%, Pr:2%, Pm:1%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, be 2.7%, 1/4 thickness is 7.0% to center second-phase percent by volume in thickness place, surface to 1/4 second-phase percent by volume, and without banded structure;

This steel plate is 3.2 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.2 μm, and 1/4 thickness is 4.8 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.0 μm.

Aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, the composition of this steel plate and mass percent are: C:0.29%, Mn:0.46%, Si:0.10%, P:0.007%, S≤0.004%, V:0.08%, Ti:0.10%, Al:0.11%, N≤0.006%, Cu:0.013%, Cr:0.5%, Mo:0.35%, rare earth microelement: 0.022%, and surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:10%, Ce:15%, Er:4%, Pr:4%, Pm:2%, Dy:3%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, be 2.8%, 1/4 thickness is 7.4% to center second-phase percent by volume in thickness place, surface to 1/4 second-phase percent by volume, and without banded structure;

This steel plate is 3.3 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.4 μm, and 1/4 thickness is 5.0 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.1 μm.

Aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, the composition of this steel plate and mass percent are: C:0.31%, Mn:0.47%, Si:0.12%, P:0.008%, S≤0.004%, V:0.09%, Ti:0.12%, Al:0.13%, N≤0.006%, Cu:0.015%, Cr:0.6%, Mo:0.36%, rare earth microelement: 0.032%, and surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:12%, Ce:16%, Er:5%, Pr:6%, Pm:4%, Dy:5%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, be 2.9%, 1/4 thickness is 7.5% to center second-phase percent by volume in thickness place, surface to 1/4 second-phase percent by volume, and without banded structure;

This steel plate is 3.4 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.6 μm, and 1/4 thickness is 5.1 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.3 μm.

A preparation method for shelf platform-specific Wear-resistant corrosion-resistant steel plate, comprises following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1150-1170 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1560-1580 DEG C, to add rare earth microelement; Ladle temperature controls at 1610-1630 DEG C; The whole atm number of tapping process stirs, and tolerance is 450-750L/min, and after having gone out steel, little tolerance stirs, and tolerance is 10-50 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 8000W-9000W, controls conduction time to drop into Ca after 10-12min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 20-22min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 15-17min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1150-1170 DEG C, entrance finishing temperature is 730-750 DEG C, finishing temperature is 670-690 DEG C, adopt the air-cooled rate of cooling with 2-4 DEG C/s that slab is chilled to 550-570 DEG C after hot rolling, adopt again water-cooled with the rate of cooling of 4-6 DEG C/s by slab water-cooled to 370-390 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 7-9 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1250-1270 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 950-770 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 570-590 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 15-17 DEG C/s, steel plate is chilled to 570-590 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 7-9 DEG C/s by steel plate water-cooled to 420-450 DEG C, then air cooling is to 350-370 DEG C, then adopt water-cooled with the rate of cooling of 4-6 DEG C/s by steel plate water-cooled to room temperature;

Reasonable two fine ferrite compared and perlite are obtained by above thermomechanical controlled rolling and controlled cooling technique and thermal treatment, at thickness place, surface to 1/4, second-phase percent by volume is 2.5-2.8%, 1/4 thickness is 7.0-7.5% to center second-phase percent by volume, and without banded structure.

The preparation method of aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, comprises following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1150 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1560 DEG C, to add rare earth microelement; Ladle temperature controls at 1610 DEG C; The whole atm number of tapping process stirs, and tolerance is 450L/min, and after having gone out steel, little tolerance stirs, and tolerance is 10-50 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 8000W, controls conduction time to drop into Ca after 10min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 20min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 15min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1150 DEG C, entrance finishing temperature is 730 DEG C, finishing temperature is 670 DEG C, adopt after hot rolling and air-cooledly with the rate of cooling of 2 DEG C/s, slab is chilled to 550 DEG C, adopt water-cooled again with the rate of cooling of 4 DEG C/s by slab water-cooled to 370 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 7 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1250 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 950 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 570 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 15 DEG C/s, steel plate is chilled to 570 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 7 DEG C/s by steel plate water-cooled to 420 DEG C, then air cooling to 350 DEG C, then adopt water-cooled with the rate of cooling of 4 DEG C/s by steel plate water-cooled to room temperature.

The preparation method of aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, comprises following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1160 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1570 DEG C, to add rare earth microelement; Ladle temperature controls at 1620 DEG C; The whole atm number of tapping process stirs, and tolerance is 550L/min, and after having gone out steel, little tolerance stirs, and tolerance is 35 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 8500W, controls conduction time to drop into Ca after 11min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 21min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 16min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1160 DEG C, entrance finishing temperature is 740 DEG C, finishing temperature is 680 DEG C, adopt after hot rolling and air-cooledly with the rate of cooling of 3 DEG C/s, slab is chilled to 560 DEG C, adopt water-cooled again with the rate of cooling of 5 DEG C/s by slab water-cooled to 380 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 8 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1260 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 960 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 580 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 16 DEG C/s, steel plate is chilled to 580 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 8 DEG C/s by steel plate water-cooled to 430 DEG C, then air cooling to 360 DEG C, then adopt water-cooled with the rate of cooling of 5 DEG C/s by steel plate water-cooled to room temperature.

Further, the preparation method of aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, comprises following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1150-1170 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1580 DEG C, to add rare earth microelement; Ladle temperature controls at 1630 DEG C; The whole atm number of tapping process stirs, and tolerance is 750L/min, and after having gone out steel, little tolerance stirs, and tolerance is 50 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 9000W, controls conduction time to drop into Ca after 12min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 22min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 17min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1170 DEG C, entrance finishing temperature is 750 DEG C, finishing temperature is 690 DEG C, adopt after hot rolling and air-cooledly with the rate of cooling of 4 DEG C/s, slab is chilled to 570 DEG C, adopt water-cooled again with the rate of cooling of 6 DEG C/s by slab water-cooled to 390 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 9 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1270 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 770 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 590 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 17 DEG C/s, steel plate is chilled to 590 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 9 DEG C/s by steel plate water-cooled to 450 DEG C, then air cooling to 370 DEG C, then adopt water-cooled with the rate of cooling of 6 DEG C/s by steel plate water-cooled to room temperature.

The invention has the beneficial effects as follows:

Al and Nb in composition of steel of the present invention, the effect that the control of V, Ti, Cu, Cr and Mo content is played are: steel plate of the present invention, containing C, Si, Mn element, adds Al and Nb, V, Ti, Cu, Cr and Mo can refined crystalline strengthening and precipitation strengths, and with low cost; Add rare earth microelement, the deleterious effect of the element such as phosphorus and low melting point can be reduced by the degree of depth content that reduces oxygen and sulphur; And by controlling Molten Steel Cleanliness in conjunction with LF, RH, continuous casting process, adopt two-stage controlled rolling, the cold and process of thermal treatment of ACC control can obtain ferrite and add pearlitic structure, successfully produce the antiacid steel plate of normalizing, steel plate has good obdurability and Antacid effectiveness.

The effect that the control of thermomechanical controlled rolling and controlled cooling technique of the present invention and thermal treatment process is played is: thick steel plates differs greatly in operation of rolling light plate Deformation in thickness amount, speed of cooling along plate thickness in process of cooling differs greatly, thus cause changing greatly along the Ferrite Grain Size of thickness x cross sectional, volume fraction, easily form banded structure in central zone; Because surface of steel plate distortion is higher than heart portion, and cooling rate is higher than heart portion, and Ferrite Grain Size is increased to center gradually by surface, and perlite volume fraction is increased gradually by centripetal portion, surface; The present invention passes through the control of thermomechanical controlled rolling and controlled cooling technique and thermal treatment process, obtain the perlite of rational two-phase when fine ferrite and Dispersed precipitate, avoid the formation of banded structure, occur without banded structure, improve Antacid effectiveness, thickness directional properties and low-temperature flexibility, thus be reached through the object that microtexture controls effectively to improve steel plate Antacid effectiveness.

Embodiment

Below in conjunction with specific embodiment, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited thereto.

embodiment 1

The present embodiment is a kind of shelf platform-specific Wear-resistant corrosion-resistant steel plate, the composition of this steel plate and mass percent are: C:0.28%, Mn:0.45%, Si:0.09%, P:0.006%, S≤0.004%, V:0.07%, Ti:0.08-0.12%, Al:0.10%, N≤0.006%, Cu:0.012%, Cr:0.4%, Mo:0.33%, rare earth microelement: 0.015%, and surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:8-%, Ce:11%, Er:3%, Pr:2%, Pm:1%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, be 2.7%, 1/4 thickness is 7.0% to center second-phase percent by volume in thickness place, surface to 1/4 second-phase percent by volume, and without banded structure; This steel plate is 3.2 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.2 μm, and 1/4 thickness is 4.8 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.0 μm.

The preparation method of the shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, comprises following steps:

Comprise following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1150 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1560 DEG C, to add rare earth microelement; Ladle temperature controls at 1610 DEG C; The whole atm number of tapping process stirs, and tolerance is 450L/min, and after having gone out steel, little tolerance stirs, and tolerance is 10-50 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 8000W, controls conduction time to drop into Ca after 10min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 20min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 15min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1150 DEG C, entrance finishing temperature is 730 DEG C, finishing temperature is 670 DEG C, adopt after hot rolling and air-cooledly with the rate of cooling of 2 DEG C/s, slab is chilled to 550 DEG C, adopt water-cooled again with the rate of cooling of 4 DEG C/s by slab water-cooled to 370 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 7 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1250 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 950 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 570 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 15 DEG C/s, steel plate is chilled to 570 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 7 DEG C/s by steel plate water-cooled to 420 DEG C, then air cooling to 350 DEG C, then adopt water-cooled with the rate of cooling of 4 DEG C/s by steel plate water-cooled to room temperature.

embodiment 2

The shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, the composition of this steel plate and mass percent are: C:0.29%, Mn:0.46%, Si:0.10%, P:0.007%, S≤0.004%, V:0.08%, Ti:0.10%, Al:0.11%, N≤0.006%, Cu:0.013%, Cr:0.5%, Mo:0.35%, rare earth microelement: 0.022%, and surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:10%, Ce:15%, Er:4%, Pr:4%, Pm:2%, Dy:3%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, be 2.8%, 1/4 thickness is 7.4% to center second-phase percent by volume in thickness place, surface to 1/4 second-phase percent by volume, and without banded structure; This steel plate is 3.3 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.4 μm, and 1/4 thickness is 5.0 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.1 μm.

The preparation method of the shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, comprises following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1160 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1570 DEG C, to add rare earth microelement; Ladle temperature controls at 1620 DEG C; The whole atm number of tapping process stirs, and tolerance is 550L/min, and after having gone out steel, little tolerance stirs, and tolerance is 35 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 8500W, controls conduction time to drop into Ca after 11min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 21min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 16min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1160 DEG C, entrance finishing temperature is 740 DEG C, finishing temperature is 680 DEG C, adopt after hot rolling and air-cooledly with the rate of cooling of 3 DEG C/s, slab is chilled to 560 DEG C, adopt water-cooled again with the rate of cooling of 5 DEG C/s by slab water-cooled to 380 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 8 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1260 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 960 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 580 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 16 DEG C/s, steel plate is chilled to 580 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 8 DEG C/s by steel plate water-cooled to 430 DEG C, then air cooling to 360 DEG C, then adopt water-cooled with the rate of cooling of 5 DEG C/s by steel plate water-cooled to room temperature.

embodiment 3

The shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, the composition of this steel plate and mass percent are: C:0.31%, Mn:0.47%, Si:0.12%, P:0.008%, S≤0.004%, V:0.09%, Ti:0.12%, Al:0.13%, N≤0.006%, Cu:0.015%, Cr:0.6%, Mo:0.36%, rare earth microelement: 0.032%, and surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:12%, Ce:16%, Er:5%, Pr:6%, Pm:4%, Dy:5%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, be 2.9%, 1/4 thickness is 7.5% to center second-phase percent by volume in thickness place, surface to 1/4 second-phase percent by volume, and without banded structure; This steel plate is 3.4 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.6 μm, and 1/4 thickness is 5.1 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.3 μm.

The preparation method of the shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, comprises following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1150-1170 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1580 DEG C, to add rare earth microelement; Ladle temperature controls at 1630 DEG C; The whole atm number of tapping process stirs, and tolerance is 750L/min, and after having gone out steel, little tolerance stirs, and tolerance is 50 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 9000W, controls conduction time to drop into Ca after 12min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 22min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 17min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1170 DEG C, entrance finishing temperature is 750 DEG C, finishing temperature is 690 DEG C, adopt after hot rolling and air-cooledly with the rate of cooling of 4 DEG C/s, slab is chilled to 570 DEG C, adopt water-cooled again with the rate of cooling of 6 DEG C/s by slab water-cooled to 390 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 9 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1270 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 770 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 590 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 17 DEG C/s, steel plate is chilled to 590 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 9 DEG C/s by steel plate water-cooled to 450 DEG C, then air cooling to 370 DEG C, then adopt water-cooled with the rate of cooling of 6 DEG C/s by steel plate water-cooled to room temperature.

The performance of each embodiment steel plate is as shown in table 1.

The performance of each embodiment steel plate of table 1

Embodiment	Tensile strength, MPa	Yield strength, MPa	Unit elongation, %	Thickness direction relative reduction in area, %	-20 DEG C of Charpy-V impact powers, J	CLR, %	CTR, %	CSR,%	SSC
										Embodiment 1	447	314	33	60.0	225	0	0	0	Flawless
Embodiment 2	427	299	36	60.7	206	0	0	0	Flawless
										Embodiment 3	472	335	39.5	70.0	232	0	0	0	Flawless

As seen from the above table, steel grade steel of the present invention is pure, has good intensity, plasticity and low-temperature flexibility, Properties of HIC resistance and anti-SSC performance.

In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.

Claims (8)

1. a shelf platform-specific Wear-resistant corrosion-resistant steel plate, it is characterized in that: the composition of this steel plate and mass percent are: C:0.28-0.31%, Mn:0.45-0.47%, Si:0.09-0.12%, P:0.006-0.008%, S≤0.004%, V:0.07-0.09%, Ti:0.08-0.12%, Al:0.10-0.13%, N≤0.006%, Cu:0.012-0.015%, Cr:0.4-0.6%, Mo:0.33-0.36%, rare earth microelement: 0.015-0.032%, surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:8-12%, Ce:11-16%, Er:3-5%, Pr:2-6%, Pm:1-4%, Dy:0-5%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, and at thickness place, surface to 1/4, second-phase percent by volume is 2.7-2.9%, and 1/4 thickness is 7.0-7.5% to center second-phase percent by volume, and without banded structure;

This steel plate is 3.2-3.4 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.2-5.6 μm, and 1/4 thickness is 4.8-5.1 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.0-7.3 μm.

2. shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 1, it is characterized in that: the composition of this steel plate and mass percent are: C:0.28%, Mn:0.45%, Si:0.09%, P:0.006%, S≤0.004%, V:0.07%, Ti:0.08-0.12%, Al:0.10%, N≤0.006%, Cu:0.012%, Cr:0.4%, Mo:0.33%, rare earth microelement: 0.015%, surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:8-%, Ce:11%, Er:3%, Pr:2%, Pm:1%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, be 2.7%, 1/4 thickness is 7.0% to center second-phase percent by volume in thickness place, surface to 1/4 second-phase percent by volume, and without banded structure;

This steel plate is 3.2 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.2 μm, and 1/4 thickness is 4.8 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.0 μm.

3. shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 1, it is characterized in that: the composition of this steel plate and mass percent are: C:0.29%, Mn:0.46%, Si:0.10%, P:0.007%, S≤0.004%, V:0.08%, Ti:0.10%, Al:0.11%, N≤0.006%, Cu:0.013%, Cr:0.5%, Mo:0.35%, rare earth microelement: 0.022%, surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:10%, Ce:15%, Er:4%, Pr:4%, Pm:2%, Dy:3%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, be 2.8%, 1/4 thickness is 7.4% to center second-phase percent by volume in thickness place, surface to 1/4 second-phase percent by volume, and without banded structure;

This steel plate is 3.3 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.4 μm, and 1/4 thickness is 5.0 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.1 μm.

4. shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 1, it is characterized in that: the composition of this steel plate and mass percent are: C:0.31%, Mn:0.47%, Si:0.12%, P:0.008%, S≤0.004%, V:0.09%, Ti:0.12%, Al:0.13%, N≤0.006%, Cu:0.015%, Cr:0.6%, Mo:0.36%, rare earth microelement: 0.032%, surplus is Fe and inevitable impurity;

The chemical composition mass percentage of described rare earth microelement is: Nd:12%, Ce:16%, Er:5%, Pr:6%, Pm:4%, Dy:5%, and surplus is La;

In this steel plate, first-phase is ferrite, and second-phase is perlite, be 2.9%, 1/4 thickness is 7.5% to center second-phase percent by volume in thickness place, surface to 1/4 second-phase percent by volume, and without banded structure;

This steel plate is 3.4 μm at thickness place, surface to 1/4 ferrite average crystal grain diameter, and pearlite colony mean diameter is 5.6 μm, and 1/4 thickness is 5.1 μm to center ferrite average crystal grain diameter, and pearlite colony mean diameter is 7.3 μm.

5. the preparation method of the shelf platform-specific Wear-resistant corrosion-resistant steel plate as described in claim arbitrary in claim 1-4, is characterized in that: comprise following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1150-1170 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1560-1580 DEG C, to add rare earth microelement; Ladle temperature controls at 1610-1630 DEG C; The whole atm number of tapping process stirs, and tolerance is 450-750L/min, and after having gone out steel, little tolerance stirs, and tolerance is 10-50 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 8000W-9000W, controls conduction time to drop into Ca after 10-12min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 20-22min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 15-17min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1150-1170 DEG C, entrance finishing temperature is 730-750 DEG C, finishing temperature is 670-690 DEG C, adopt the air-cooled rate of cooling with 2-4 DEG C/s that slab is chilled to 550-570 DEG C after hot rolling, adopt again water-cooled with the rate of cooling of 4-6 DEG C/s by slab water-cooled to 370-390 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 7-9 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1250-1270 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 950-770 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 570-590 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 15-17 DEG C/s, steel plate is chilled to 570-590 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 7-9 DEG C/s by steel plate water-cooled to 420-450 DEG C, then air cooling is to 350-370 DEG C, then adopt water-cooled with the rate of cooling of 4-6 DEG C/s by steel plate water-cooled to room temperature;

Reasonable two fine ferrite compared and perlite are obtained by above thermomechanical controlled rolling and controlled cooling technique and thermal treatment, at thickness place, surface to 1/4, second-phase percent by volume is 2.5-2.8%, 1/4 thickness is 7.0-7.5% to center second-phase percent by volume, and without banded structure.

6. the preparation method of shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 5, is characterized in that: comprise following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1150 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1560 DEG C, to add rare earth microelement; Ladle temperature controls at 1610 DEG C; The whole atm number of tapping process stirs, and tolerance is 450L/min, and after having gone out steel, little tolerance stirs, and tolerance is 10-50 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 8000W, controls conduction time to drop into Ca after 10min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 20min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 15min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1150 DEG C, entrance finishing temperature is 730 DEG C, finishing temperature is 670 DEG C, adopt after hot rolling and air-cooledly with the rate of cooling of 2 DEG C/s, slab is chilled to 550 DEG C, adopt water-cooled again with the rate of cooling of 4 DEG C/s by slab water-cooled to 370 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 7 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1250 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 950 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 570 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 15 DEG C/s, steel plate is chilled to 570 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 7 DEG C/s by steel plate water-cooled to 420 DEG C, then air cooling to 350 DEG C, then adopt water-cooled with the rate of cooling of 4 DEG C/s by steel plate water-cooled to room temperature.

7. the preparation method of shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 5, is characterized in that: comprise following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1160 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1570 DEG C, to add rare earth microelement; Ladle temperature controls at 1620 DEG C; The whole atm number of tapping process stirs, and tolerance is 550L/min, and after having gone out steel, little tolerance stirs, and tolerance is 35 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 8500W, controls conduction time to drop into Ca after 11min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 21min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 16min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1160 DEG C, entrance finishing temperature is 740 DEG C, finishing temperature is 680 DEG C, adopt after hot rolling and air-cooledly with the rate of cooling of 3 DEG C/s, slab is chilled to 560 DEG C, adopt water-cooled again with the rate of cooling of 5 DEG C/s by slab water-cooled to 380 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 8 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1260 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 960 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 580 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 16 DEG C/s, steel plate is chilled to 580 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 8 DEG C/s by steel plate water-cooled to 430 DEG C, then air cooling to 360 DEG C, then adopt water-cooled with the rate of cooling of 5 DEG C/s by steel plate water-cooled to room temperature.

8. the preparation method of shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 5, is characterized in that: comprise following steps:

(i) hot metal pretreatment:

Mg powder or Mg powder+CaO is adopted Sulfur Content in Hot Iron content to be dropped to less than 0.005%, the temperature after hot metal pretreatment: 1150-1170 DEG C;

(ii) top and bottom combined blown converter smelting;

Terminal Composition Control requires: P≤0.008%, N≤0.006%; Terminal temperature controls, at 1580 DEG C, to add rare earth microelement; Ladle temperature controls at 1630 DEG C; The whole atm number of tapping process stirs, and tolerance is 750L/min, and after having gone out steel, little tolerance stirs, and tolerance is 50 L/min;

(iii) LF stove refining:

Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting; Use high-power power supply, power is 9000W, controls conduction time to drop into Ca after 12min, LF process;

(iv) RH Fruit storage:

RH condition of high vacuum degree≤5.0mbar, hold-time 22min; Vacuum terminates to carry out Calcium treatment to molten steel afterwards, carries out quiet stir process, soft blow time 17min after Calcium treatment to molten steel;

(v) continuous casting:

Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and middle bag superheating temperature controls within 20 DEG C;

(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:

Roughing finishing temperature is 1170 DEG C, entrance finishing temperature is 750 DEG C, finishing temperature is 690 DEG C, adopt after hot rolling and air-cooledly with the rate of cooling of 4 DEG C/s, slab is chilled to 570 DEG C, adopt water-cooled again with the rate of cooling of 6 DEG C/s by slab water-cooled to 390 DEG C, adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 9 DEG C/s, slab is chilled to room temperature, thus obtain the perlite of fine ferrite and Dispersed precipitate, and without banded structure;

(vii) steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate through thermal treatment process:

Steel plate is heated to 1270 DEG C by tempering stove tempering, after coming out of the stove, is cooled fast to 770 DEG C by pressurized air, through the first refrigerating work procedure, steel plate fast speed is cooled to 590 DEG C online, then be cooled to normal temperature by the second process for cooling;

Described first refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 17 DEG C/s, steel plate is chilled to 590 DEG C;

Described second refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 9 DEG C/s by steel plate water-cooled to 450 DEG C, then air cooling to 370 DEG C, then adopt water-cooled with the rate of cooling of 6 DEG C/s by steel plate water-cooled to room temperature.