AU2019373520B2 - 80 mm large-thickness high-toughness low-alloy wear-resistant steel plate and manufacturing method therefor - Google Patents
80 mm large-thickness high-toughness low-alloy wear-resistant steel plate and manufacturing method therefor Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The present invention relates to a 80 mm large-thickness high-toughness low-alloy wear-resistant steel plate and a manufacturing method therefor. The 80 mm large-thickness high-toughness low-alloy wear-resistant steel plate comprises the following components: 0.18-0.20% of C, 0.20-0.40% of Si, 0.90-1.20% of Mn, 0.012% or less of P, 0.002% or less of S, 0.90-1.20% of Cr, 0.20 0.40% of Mo, 0.50-0.80% of Ni, 0.008-0.030% of Ti, 0.01-0.050% of Nb, 0.030% or less of V, 0.0008-0.0025% of B, 0.02-0.06% of Alt, 0.0040% or less of N, 0.0002% or less of H, and the balance comprising Fe and inevitable impurities. The manufacturing method comprises: molten iron desulfurization pretreatment-converter smelting-LF and RH refinement-continuous casting-casting blank stacking for slow-cooling-casting blank inspection-casting blank determination-casting blank inspection and acceptance-casting blank heating-phosphorus removal-rolling-air cooling-flaw detection-shot blasting-quenching-tempering-straightening-cutting and sampling-logo spray printing-inspection-stocking. The steel plate obtained in the present invention has the surface Brinell hardness greater than 400 HB, the core Brinell hardness greater than 330 HB, and the low-temperature impact energy at -40°Ϲ higher than or equal to 20 J.
Description
80 mm Large-Thickness High-Toughness Low-Alloy Wear-Resistant Steel Plate and Manufacturing Method Therefor
The present invention relates to the field of manufacturing of wear-resistant steel, and to a wear-resistant steel plate with large thickness, and manufacturing method thereof, specifically to an 80mm wear-resistant steel plate with large thickness, high toughness and low alloy, and a manufacturing method thereof.
Low-alloy wear-resistant steel is widely used to produce mechanical equipment for engineering, mining, construction, agriculture, cement, ports, electric power and metallurgy with harsh working conditions, such as bulldozers, loaders, excavators, dump trucks, ball mills and various kinds of mining machines, grabbing cranes, stacker-reclaimers, and bending structures for material conveyance. Such components generally work in an extremely harsh environment with alternate wetting and drying, have a difficulty in replacement and require the steel plates to have high strength and hardness, excellent wear resistance and corrosion resistance, good low-temperature toughness and good welding performance to ensure a longer service life of the equipment.
Low-alloy wear-resistant steel typically has low impact toughness and is not stable in production, which leads to problems such as easy fracture and poor wear resistance of steel plates under impact conditions. There have been many patent reports on low-alloy wear-resistant steel, but there are no substantial reports on NM400 wear-resistant steel with large thickness. In addition, the hardness and low-temperature toughness of wear-resistant steel are poorly matched, and it is difficult to meet the requirements of equipment manufacturing for a large size, light weight and long life.
The patent with publication number CN 101880831 B discloses a wear-resistant steel with high strength, high toughness and low alloy and a manufacturing method thereof. Through a reasonable composition design, after subcritical quenching, reasonable properties are obtained, but this patent discloses that the product thickness is 6mm to 60mm, the Brinell hardness is above 330HB, -20°C impact toughness is below 50J, the thickness is small and the -40°C impact toughness was not assessed.
The 80mm wear-resistant steel plates with large thickness, low alloy and the best performance shall have not only high strength and hardness, but also good low-temperature toughness under the precondition of easy production and low cost; in the prior art, there are no technologies relating to an 80mm wear-resistant steel plate with large thickness, high toughness and low alloy, and a manufacturing method thereof.
A technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide an 80mm wear-resistant steel plate with large thickness, high toughness and low alloy, and a manufacturing method thereof. The production method is simple and easy, the production process is short, the cost is low, and the produced 80mm wear-resistant steel plate with large thickness, high toughness and low alloy has good mechanical properties, large thickness, high strength, high hardness, and good plasticity. More importantly, the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy also has good impact property at low temperature, and greater than or equal to 30J of -40°C low-temperature impact energy.
The present invention adopts the following technical solution to solve the foregoing technical problem:
An manufacturing method of an 80mm wear-resistant steel plate with large thickness, high toughness and low alloy, comprising the following components by weight percentage: C: 0.18-0.20%, Si: 0.20-0.40%, Mn: 0.90-1.20%, P<0.012%, S<0.002%, Cr: 0.90-1.20%, Mo: 0.20-0.40%, Ni: 0.50-0.80%, Ti: 0.008-0.030%, Nb: 0.01-0.050%, V<0.030%, B: 0.0008-0.0025%, Al: 0.02-0.06%, N<0.0040%, H<0.0002%, and the balance Fe and inevitable impurities, the mechanical properties of the wear-resistant steel plate reach the following level: yield strength >1,000 MPa, tensile strength >1,050 MPa, elongation >10%, and -40 °CA impact energy >20 J; the microstructure is a tempered martensite structure and the content of the tempered martensite in the core structure is greater than 50%, the method comprises the steps of carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining Ladle Furnace (LF) and Ruhrstahl-Heraeus (RH), continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, checking the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing; the molten steel smelted according to the required proportion of steel components is subjected to continuous casting after RH vacuum treatment, and the continuous cast blanks are 320mm thick; the casting blanks are heated, the temperature in the heating zone is 1,180-1,220°C, the temperature in the soaking zone is controlled at 1,200-1,250°C, the time in furnace is 352-450min, the soaking time is 45-50min, and the tapping temperature is 1,180-1,200°C; after heating, two-stage controlled rolling is carried out, the reduction rates of the last three passes during rolling at the first stage are all greater than or equal to 15%, the required cumulative reduction rate during rolling at the second stage is greater than or equal to 35%, the initial rolling temperature at the second stage is lower than or equal to 960°C, the finish rolling temperature at the second stage is 930-940°C, the thickness of the temperature-holding casting blanks is controlled at 112mm or more, the final rolling thickness is 80mm and after rolling, the plate is cooled in the air to room temperature; off-line heat treatment is conducted after rolling, the quenching temperature is controlled at 900-930°C, the heating rate is 1.3±0.lmin/mm, the temperature holding time is 45-50min, the quenched steel plate is tempered in a car-bottom furnace, the tempering temperature is controlled at 350-400°C, the heating rate is 40-45°C/h and the temperature holding time is 480-500min.
Beneficial effects of the present invention:
1. The present invention adopts a reasonable composition design of medium carbon and alloying, produces a wear-resistant steel with a thickness of 80mm through the interaction of alloy elements such as carbon, manganese, chromium, nickel, molybdenum and copper, and microalloy elements such as niobium and titanium and a controlled rolling process, and achieves a good match between hardness and low temperature toughness through a reasonable off-line heat treatment process.
2. The 80mm steel plate of the present invention is rolled at high temperature and high pressure in a controlled manner, the compression ratio is 4:1, the soaking temperature is controlled at approximately 1,200°C and the time in furnace is lengthened appropriately to ensure overall uniformity of the steel temperature;
3. The finished product is 80mm thick and rolled through two-stage control, the reduction rates of the last three passes during rolling at the first stage are all greater than or equal to 15% and the required cumulative reduction rate during rolling at the second stage is greater than or equal to 35% to ensure no obvious structural difference from the surface to the core.
4. The structure of the steel plate in the present invention is essentially a martensite structure. The wear resistance is improved mainly through the high hardness and good toughness of martensite.
5. The wear-resistant steel plate of the present invention has good low-temperature impact toughness and cold roll forming performance, which meet the requirements of greater than or equal to 20J of -40°C low-temperature impact toughness.
Figure 1 is a photo of the metallographic structure on the surface of the wear-resistant steel with large thickness, high toughness and low alloy in Embodiment 2 of the present invention;
Figure 2 is a photo of the metallographic structure at 1/4 thickness of the wear-resistant steel with large thickness, high toughness and low alloy in Embodiment 2 of the present invention.
Figure 3 is a photo of the metallographic structure at 1/2 thickness of the wear-resistant steel with large thickness, high toughness and low alloy in Embodiment 2 of the present invention.
Embodiment 1
This embodiment is an 80mm wear-resistant steel plate with large thickness, high toughness and low alloy, comprising the following components by weight percentage: C: 0.18%, Si: 0.20%, Mn: 1.20%, P<0.012%, S<0.0015%, Cr: 1.20%, Mo: 0.20%, Ni: 0.50%, Ti: 0.008%, Nb: 0.01%, V<0.030%, B: 0.0008%, Al: 0.035%, N<0.0040%, H<0.0002%, and the balance Fe and inevitable impurities.
A manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy in this embodiment, comprising the steps of carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, checking the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing;
The molten steel smelted according to the required proportion of steel components is subjected to continuous casting after RH vacuum treatment, and the continuous cast blanks are 320mm thick;
The casting blanks are heated, the temperature in the heating zone is 1,190°C, the temperature in the soaking zone is controlled at 1,200°C, the time in furnace is 400min, the soaking time is 50min, and the tapping temperature is 1,185°C; after heating, two-stage controlled rolling is carried out, the reduction rates of the last three passes during rolling at the first stage are all greater than or equal to 15%, the required cumulative reduction rate during rolling at the second stage is greater than or equal to 35%, the initial rolling temperature at the second stage is 951°C, the finish rolling temperature at the second stage is 932°C, the thickness of the temperature-holding casting blanks is controlled at 112mm or more, the final rolling thickness is 80mm and after rolling, the plate is cooled in the air to room temperature;
Off-line heat treatment is conducted after rolling, the quenching temperature is controlled at 910°C, the heating rate is 1.3min/mm, the temperature holding time is 48min, the quenched steel plate is tempered in a car-bottom furnace, the tempering temperature is controlled at 360°C, the heating rate is 40°C/h and the temperature holding time is 485min.
Embodiment 2
This embodiment is an 80mm wear-resistant steel plate with large thickness, high toughness and low alloy, comprising the following components by weight percentage: C: 0.19%, Si: 0.30%, Mn: 1.10%, P<0.012%, S<0.0015%, Cr: 1.10%, Mo: 0.32%, Ni: 0.70%, Ti: 0.013%, Nb: 0.013%, V<0.030%, B: 0.0013%, Al: 0.040%, N<0.0040%, H<0.0002%, and the balance Fe and inevitable impurities.
A manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy in this embodiment, comprising the steps of carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, checking the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing;
The molten steel smelted according to the required proportion of steel components is subjected to continuous casting after RH vacuum treatment, and the continuous cast blanks are 320mm thick;
The casting blanks are heated, the temperature in the heating zone is 1,200°C, the temperature in the soaking zone is controlled at 1,210°C, the time in furnace is 392min, the soaking time is 48min, and the tapping temperature is 1,197°C; after heating, two-stage controlled rolling is carried out, the reduction rates of the last three passes during rolling at the first stage are all greater than or equal to 15%, the required cumulative reduction rate during rolling at the second stage is greater than or equal to 35%, the initial rolling temperature at the second stage is 937°C, the finish rolling temperature at the second stage is 937°C, the thickness of the temperature-holding casting blanks is controlled at 112mm or more, the final rolling thickness is 80mm and after rolling, the plate is cooled in the air to room temperature;
Off-line heat treatment is conducted after rolling, the quenching temperature is controlled at 912°C, the heating rate is 1.2min/mm, the temperature holding time is 45min, the quenched steel plate is tempered in a car-bottom furnace, the tempering temperature is controlled at 375°C, the heating rate is 43°C/h and the temperature holding time is 480min.
Embodiment 3
This embodiment is an 80mm wear-resistant steel plate with large thickness, high toughness and low alloy, comprising the following components by weight percentage: C: 0.20%, Si: 0.40%, Mn: 0.90%, P<0.012%, S<0.0015%, Cr: 0.90%, Mo: 0.40%, Ni: 0.80%, Ti: 0.030%, Nb: 0.050%, V<0.030%, B: 0.0025%, Al: 0.035%, N<0.0040%, H<0.0002%, the balance Fe and inevitable impurities.
A manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy in this embodiment, comprising the steps of carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, checking the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing;
The molten steel smelted according to the required proportion of steel components is subjected to continuous casting after RH vacuum treatment, and the continuous cast blanks are 320mm thick;
The casting blanks are heated, the temperature in the heating zone is 1,210°C, the temperature in the soaking zone is controlled at 1,250°C, the time in furnace is 380min, the soaking time is 45min, and the tapping temperature is 1,190°C; after heating, two-stage controlled rolling is carried out, the reduction rates of the last three passes during rolling at the first stage are all greater than or equal to 15%, the required cumulative reduction rate during rolling at the second stage is greater than or equal to 35%, the initial rolling temperature at the second stage is 935°C, the finish rolling temperature at the second stage is 935°C, the thickness of the temperature-holding casting blanks is controlled at 112mm or more, the final rolling thickness is 80mm and after rolling, the plate is cooled in the air to room temperature;
Off-line heat treatment is conducted after rolling, the quenching temperature is controlled at 910°C, the heating rate is 1.4min/mm, the temperature holding time is 46min, the quenched steel plate is tempered in a car-bottom furnace, the tempering temperature is controlled at 390°C, the heating rate is 45°C/h and the temperature holding time is 482min.
The mechanical properties of the steel plates in the embodiments were tested. To be specific, the strength was tested according to GB/T228-2002 Metallic materials - tensile testing at ambient temperature, the low temperature impact toughness was tested according to GB/T 229-2007 Metallic materials - Charpy pendulum impact test method, and hardness was tested according to GB/T231.1-2009. The obtained results are shown in Table 1.
Table 1 Mechanical properties of steel plates of the present invention
Tensile strength Elongation -40°C impact Surface Core Yield strength Embodiment /MPa /MPa A50/% energy KV2/J hardness hardness /HB /HB
1 1041 1340 14.5 21 417 346
2 1034 1318 14 28 422 342
3 1021 1262 15 32 397 336
From Table 1, it can be seen that the surface Brinell hardness of the wear-resistant steel of the present invention is greater than 400HB, the core Brinell hardness is greater than 334HB, the tensile strength is greater than 1,OOOMPa, the elongation is greater than 10% and the -40°C impact energy is greater than 20J. It can be seen that the wear-resistant steel related to in the present invention has good resistance to deformation and wear and meanwhile has good low-temperature impact toughness.
Fig. 1 to Fig. 3 show the metallographic structures of the steel after tempering in Embodiment 2. From the structures in the figures, it can be seen that metallographic structures from surface to 1/4 thickness are all tempered martensite structures, and the content of the tempered martensite structure at 1/2 thickness is greater than 50%.
In addition to the foregoing embodiments, the present invention may also have other implementation manners. All the technical solutions formed through identical replacement or equivalent transformation fall in the scope of the claims of the present invention.
The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that such prior art forms part of the common general knowledge.
It will be understood that the terms "comprise" and "include" and any of their derivatives (e.g. comprises, comprising, includes, including) as used in this specification, and the claims that follow, is to be taken to be inclusive of features to which the term refers, and is not meant to exclude the presence of any additional features unless otherwise stated or implied.
In some cases, a single embodiment may, for succinctness and/or to assist in understanding the scope of the disclosure, combine multiple features. It is to be understood that in such a case, these multiple features may be provided separately (in separate embodiments), or in any other suitable combination. Alternatively, where separate features are described in separate embodiments, these separate features may be combined into a single embodiment unless otherwise stated or implied. This also applies to the claims which can be recombined in any combination. That is a claim may be amended to include a feature defined in any other claim. Further a phrase referring to "at least one of' a list of items refers to any combination of those items, including single members. As an example, "at least one of: a, b, or c" is intended to cover: a,b, c, a-b, a-c,b-c, and a-b-c.
Claims (8)
1. A manufacturing method of an 80 mm wear-resistant steel plate with large thickness, high toughness and low alloy, wherein the steel plate comprises the following components by weight percentage: C: 0.18-0.20%, Si: 0.20-0.40%, Mn: 0.90-1.20%, P<0.012%, S<0.002%, Cr: 0.90-1.20%, Mo: 0.20-0.40%, Ni: 0.50-0.80%, Ti: 0.008-0.030%, Nb: 0.01-0.050%, V<0.030%, B: 0.0008-0.0025%, Al: 0.02-0.06%, N<0.0040%, H<0.0002%, and the balance Fe and inevitable impurities, the mechanical properties of the wear-resistant steel plate reach the following level: yield strength >1,000 MPa, tensile strength >1,050 MPa, elongation >10%, and -40 °CA impact energy >20 J; the microstructure is a tempered martensite structure and the content of the tempered martensite in the core structure is greater than 50%,
the method comprises the steps of carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining Ladle Furnace (LF) and Ruhrstahl-Heraeus (RH), continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, checking the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing, and wherein
the molten steel smelted according to the required proportion of steel components is subjected to continuous casting after RH vacuum treatment, and the continuous cast blanks are 320mm thick;
the casting blanks are heated, the temperature in the heating zone is 1,180-1,220 °C, the temperature in the soaking zone is controlled at 1,200-1,250 °C, the time in furnace is 352-450 min, the soaking time is 45-50 min, and the tapping temperature is 1,180-1,200 °C; after heating, two-stage controlled rolling is carried out, the reduction rates of the last three passes during rolling at the first stage are all greater than or equal to 15%, the required cumulative reduction rate during rolling at the second stage is greater than or equal to 35%, the initial rolling temperature at the second stage is lower than or equal to 960 °C, the finish rolling temperature at the second stage is 930-940 °C, the thickness of the temperature-holding casting blanks is controlled at 112 mm or more, the final rolling thickness is 80 mm and after rolling, the plate is cooled in the air to room temperature;
off-line heat treatment is conducted after rolling, the quenching temperature is controlled at
900-930 °C, the heating rate is 1.3±0.1 min/mm, the temperature holding time is 45-50 min, the quenched steel plate is tempered in a car-bottom furnace, the tempering temperature is controlled at 350-400 °C, the heating rate is 40-45 °C/h and the temperature holding time is 480-500 min.
2. The manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy according to claim 1, wherein the steel plate comprises the following components by weight percentage: C: 0.18%, Si: 0.20%, Mn: 1.20%, P<0.012%, S<0.0015%, Cr: 1.20%, Mo: 0.20%, Ni: 0.50%, Ti: 0.008%, Nb: 0.01%, V<0.030%, B: 0.0008%, Al: 0.035%, N<0.0040%, H<0.0002%, and the balance Fe and inevitable impurities.
3. The manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy according to claim 1, wherein the steel plate comprises the following components by weight percentage: C: 0.19%, Si: 0.30%, Mn: 1.10%, P<0.012%, S<0.0015%, Cr: 1.10%, Mo: 0.32%, Ni: 0.70%, Ti: 0.013%, Nb: 0.013%, V<0.030%, B: 0.0013%, Al: 0.040%, N<0.0040%, H<0.0002%, and the balance Fe and inevitable impurities.
4. The manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy according to claim 1, wherein the steel plate comprises the following components by weight percentage: C: 0.20%, Si: 0.40%, Mn: 0.90%, P<0.012%, S<0.0015%, Cr: 0.90%, Mo: 0.40%, Ni: 0.80%, Ti: 0.030%, Nb: 0.050%, V<0.030%, B: 0.0025%, Al: 0.035%, N<0.0040%, H<0.0002%, and the balance Fe and inevitable impurities.
5. The manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy according to any of claims 1 to 4, wherein the microstructure of the wear-resistant steel plate is a tempered martensite structure, and the content of the tempered martensite in the core structure is greater than 50%.
6. The manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy according to any one of claims 1 to 5, wherein the molten steel smelted according to the required proportion of steel components is subjected to continuous casting after RH vacuum treatment, and the continuous cast blanks are 320mm thick;
the casting blanks are heated, the temperature in the heating zone is 1,190°C, the temperature in the soaking zone is controlled at 1,200°C, the time in furnace is 400min, the soaking time is 50min, and the tapping temperature is 1,185°C; after heating, two-stage controlled rolling is carried out, the reduction rates of the last three passes during rolling at the first stage are all greater than or equal to 15%, the required cumulative reduction rate during rolling at the second stage is greater than or equal to 35%, the initial rolling temperature at the second stage is 951°C, the finish rolling temperature at the second stage is 932°C, the thickness of the temperature-holding casting blanks is controlled at 112mm or more, the final rolling thickness is 80mm and after rolling, the plate is cooled in the air to room temperature; off-line heat treatment is conducted after rolling, the quenching temperature is controlled at 910°C, the heating rate is 1.3min/mm, the temperature holding time is 48min, the quenched steel plate is tempered in a car-bottom furnace, the tempering temperature is controlled at 360°C, the heating rate is 40°C/h and the temperature holding time is 485min.
7. The manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy according to any one of claims 1 to 5, wherein the molten steel smelted according to the required proportion of steel components is subjected to continuous casting after RH vacuum treatment, and the continuous cast blanks are 320mm thick;
the casting blanks are heated, the temperature in the heating zone is 1,200°C, the temperature in the soaking zone is controlled at 1,210°C, the time in furnace is 392min, the soaking time is 48min, and the tapping temperature is 1,197°C; after heating, two-stage controlled rolling is carried out, the reduction rates of the last three passes during rolling at the first stage are all greater than or equal to 15%, the required cumulative reduction rate during rolling at the second stage is greater than or equal to 35%, the initial rolling temperature at the second stage is 937°C, the finish rolling temperature at the second stage is 937°C, the thickness of the temperature-holding casting blanks is controlled at 112mm or more, the final rolling thickness is 80mm and after rolling, the plate is cooled in the air to room temperature;
off-line heat treatment is conducted after rolling, the quenching temperature is controlled at 912°C, the heating rate is 1.2min/mm, the temperature holding time is 45min, the quenched steel plate is tempered in a car-bottom furnace, the tempering temperature is controlled at 375°C, the heating rate is 43°C/h and the temperature holding time is 480min.
8. The manufacturing method of the 80mm wear-resistant steel plate with large thickness, high toughness and low alloy according to any one of claims 1 to 5, wherein the molten steel smelted according to the required proportion of steel components is subjected to continuous casting after RH vacuum treatment, and the continuous cast blanks are 320mm thick; the casting blanks are heated, the temperature in the heating zone is 1,210C, the temperature in the soaking zone is controlled at 1,250C, the time in furnace is 380min, the soaking time is 45min, and the tapping temperature is 1,190°C; after heating, two-stage controlled rolling is carried out, the reduction rates of the last three passes during rolling at the first stage are all greater than or equal to 15%, the required cumulative reduction rate during rolling at the second stage is greater than or equal to 35%, the initial rolling temperature at the second stage is 935°C, the finish rolling temperature at the second stage is 935°C, the thickness of the temperature-holding casting blanks is controlled at 112mm or more, the final rolling thickness is 80mm and after rolling, the plate is cooled in the air to room temperature; off-line heat treatment is conducted after rolling, the quenching temperature is controlled at 910C, the heating rate is 1.4min/mm, the temperature holding time is 46min, the quenched steel plate is tempered in a car-bottom furnace, the tempering temperature is controlled at 390C, the heating rate is 45°C/h and the temperature holding time is 482min.
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| CN201811266764.XA CN109280850B (en) | 2018-10-29 | 2018-10-29 | 80mm large-thickness high-toughness low-alloy wear-resistant steel plate and manufacturing method thereof |
| PCT/CN2019/093658 WO2020087961A1 (en) | 2018-10-29 | 2019-06-28 | 80 mm large-thickness high-toughness low-alloy wear-resistant steel plate and manufacturing method therefor |
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| CN109280850B (en) * | 2018-10-29 | 2020-09-25 | 南京钢铁股份有限公司 | 80mm large-thickness high-toughness low-alloy wear-resistant steel plate and manufacturing method thereof |
| CN112195397A (en) * | 2020-09-11 | 2021-01-08 | 南京钢铁股份有限公司 | Large-thickness low-carbon-equivalent high-toughness wear-resistant steel plate and manufacturing method thereof |
| CN113005354A (en) * | 2021-03-23 | 2021-06-22 | 山东钢铁集团日照有限公司 | Preparation method of low-alloy-cost large-thickness high-low-temperature-toughness 13MnNi6-3 quenched and tempered container steel |
| CN113755763B (en) * | 2021-07-26 | 2022-11-04 | 安徽瑞泰新材料科技有限公司 | Large-diameter medium-carbon low-alloy wear-resistant steel ball and preparation method thereof |
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| CN116891975A (en) * | 2023-07-24 | 2023-10-17 | 鞍钢股份有限公司 | Ultrahigh-strength steel plate for ships in ice areas and manufacturing method |
| CN116926431A (en) * | 2023-08-03 | 2023-10-24 | 湖南华菱湘潭钢铁有限公司 | High-strength high-toughness NM450 wear-resistant steel plate and production method thereof |
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| JP5833964B2 (en) * | 2012-03-29 | 2015-12-16 | 株式会社神戸製鋼所 | Steel sheet excellent in bending workability, impact property and tensile property, and method for producing the same |
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| CN107299279A (en) * | 2017-06-28 | 2017-10-27 | 山东钢铁股份有限公司 | A kind of 100mm thickness 410HB grade wear-resisting steel plates and preparation method thereof |
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