CN111778450A - Medium-manganese medium-thickness steel for 800MPa engineering machinery and manufacturing method thereof - Google Patents
Medium-manganese medium-thickness steel for 800MPa engineering machinery and manufacturing method thereof Download PDFInfo
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- CN111778450A CN111778450A CN202010584497.1A CN202010584497A CN111778450A CN 111778450 A CN111778450 A CN 111778450A CN 202010584497 A CN202010584497 A CN 202010584497A CN 111778450 A CN111778450 A CN 111778450A
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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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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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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- 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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Abstract
The invention discloses medium-manganese medium-thickness steel for 800MPa engineering machinery and a manufacturing method thereof, and relates to the technical field of steel smelting, wherein the medium-manganese medium-thickness steel comprises the following chemical components in percentage by mass: c: 0.05-0.08%, Mn: 4.8% -5.8%, Si: 0.10-0.35%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, Ti: 0.01-0.05%, Ni + Cr + Mo: 0.7 to 1.2 percent, and the balance of Fe and inevitable impurities. The steel can obtain excellent core mechanical properties which are not possessed by common 800MPa grade high-strength structural steel, and meets the requirements of engineering machinery industry on the safety performance and low manufacturing cost of the ultrahigh-strength steel in complex and severe environments.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to medium-manganese medium-thickness steel for 800MPa engineering machinery and a manufacturing method thereof.
Background
The 800MPa grade steel for the engineering machinery is mainly applied to large electric shovels, drilling rigs, buckets of bulldozers, crane booms, rotary tables, coal machine structural parts and the like, the component system of the grade steel for the high-strength engineering machinery is added with more noble metal elements such as high-content Cr, Ni, Mo and the like, the P, S content and inclusions in the steel are reduced through LF and RH vacuum treatment, and molten steel is purified; the grain is refined by adopting the process means of controlled rolling and controlled cooling, the relaxation control precipitation principle, microalloy precipitation strengthening and the like, the strength of the steel plate is improved, the thick steel plate needs to be subjected to quenching and tempering treatment, and the problems of high raw material cost and high process cost exist. Particularly, the hardenability of thick materials is poor, the uniformity of structures in the thickness direction is poor, the low-temperature impact toughness of a steel core is poor, the yield ratio is too high (generally reaching about 0.95), the deformation capacity of the materials is reduced due to the too high yield ratio, the safety of a structural part in the use process cannot be guaranteed, so that the yield ratio needs to be reduced while the strength is improved, and reasonable toughness and plasticity matching are the primary conditions for designing the high-strength structural steel for engineering machinery.
In recent years, medium manganese steel is a research hotspot in the field of steel materials, the content of Mn in the material is improved, the content of noble alloy elements such as Ni, Cr, Mo and the like in the steel is reduced, and the comprehensive cost of the material can be greatly reduced. The characteristics of the medium manganese material can solve the problems of poor low-temperature impact toughness, overhigh yield ratio and the like of the steel for the high-strength structure in the engineering machinery industry, and can meet the requirements on the safety performance and the construction cost of the steel for the high-strength engineering machinery in the complex and severe environment of the engineering machinery industry.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides the medium-manganese medium-thickness steel for the 800MPa engineering machinery and the manufacturing method thereof, and the manufactured steel plate has excellent comprehensive mechanical property and can meet the requirements of the engineering machinery field on the safety performance and low manufacturing cost of the ultrahigh-strength steel under the complicated and severe environment.
In order to solve the technical problems, the invention provides medium-manganese medium-thickness steel for 800MPa engineering machinery, which comprises the following chemical components in percentage by mass: c: 0.05-0.08%, Mn: 4.8% -5.8%, Si: 0.10-0.35%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, Ti: 0.01-0.05%, Ni + Cr + Mo: 0.7 to 1.2 percent, and the balance of Fe and inevitable impurities.
The technical effects are as follows: the steel manufactured by the invention takes manganese as an important alloying element, expensive Ni-Cr-Mo alloy is replaced by cheap Mn element, the hardenability of the steel plate is improved by the Mn element, so that the steel plate obtains martensite structure in a wide cooling speed range, then a small amount of reverse transformation austenite is formed in the tempering process of a two-phase region, the strength of the steel is improved by the reverse transformation martensite structure, the toughness and the plasticity of the steel are improved by the reverse transformation austenite, the steel has high strength and low yield ratio, the uniformity of the structure along the thickness direction is good, excellent core mechanical properties which are not possessed by common 800MPa grade high-strength structural steel can be obtained, and the requirements of engineering machinery industry on the safety performance and the low manufacturing cost of the ultrahigh-strength steel in complicated and severe environments are met.
The technical scheme of the invention is further defined as follows:
the medium manganese medium-thickness steel for 800MPa engineering machinery has the product thickness of 12-50 mm.
The yield ratio of the medium-manganese medium-thickness steel for the 800MPa engineering machinery is less than or equal to 0.88.
The medium-manganese medium-thickness steel for the 800MPa engineering machinery comprises the following chemical components in percentage by mass: c: 0.055% -0.080%, Mn: 4.85% -5.80%, Si: 0.11-0.35%, P is less than or equal to 0.009%, S is less than or equal to 0.002%, Ti: 0.015% -0.045%, Ni + Cr + Mo: 0.75 to 1.20 percent, and the balance of Fe and inevitable impurities.
The medium-manganese medium-thickness steel for the 800MPa engineering machinery comprises the following chemical components in percentage by mass: c: 0.055% -0.080%, Mn: 4.85% -5.80%, Si: 0.11-0.35%, P is less than or equal to 0.009%, S is less than or equal to 0.002%, Ti: 0.015% -0.045%, Ni + Cr + Mo: 0.75 to 1.20 percent, and the balance of Fe and inevitable impurities.
The invention also aims to provide a method for manufacturing the medium-manganese medium-thickness steel for the 800MPa engineering machinery,
molten iron desulfurization treatment and converter smelting: p in molten steel is less than or equal to 0.010 percent, and S in molten steel is less than or equal to 0.003 percent;
LF refining: the alloying requirement of a component system is met;
continuous casting: the pulling speed is less than or equal to 1.5m/min, and surface defects are cleaned;
heating the plate blank: the temperature is 1080-1200 ℃;
rolling a plate blank: two-stage rolling is carried out, wherein the initial rolling temperature of one stage is less than or equal to 1030 ℃, the final rolling temperature is greater than or equal to 930 ℃, the initial rolling temperature of the two stages is less than or equal to 890 ℃, and the final rolling temperature is greater than or equal to 800 ℃;
ACC after rolling: the cooling rate is more than or equal to 1 ℃/s, and the surface red returning temperature of the steel plate after the cooling is stopped is less than or equal to 200 ℃;
heat treatment after rolling: the tempering temperature is 600-650 ℃, and the steel plate is air-cooled to normal temperature after tempering.
The manufacturing method of the medium manganese medium-thickness steel for the 800MPa engineering machinery comprises a slab heating step, wherein the soaking time is calculated by the thickness x (1.2-2.5 min/cm).
The manufacturing method of the medium manganese medium-thickness steel for the 800MPa engineering machinery comprises a heat treatment step after rolling, and the soaking time is calculated by plate thickness x (1.5-3 min/mm).
The manufacturing method of the medium manganese medium-thickness steel for the 800MPa engineering machinery comprises the step of heat treatment after rolling, wherein the steel plate with the thickness of less than 40mm is sent to a heat treatment furnace for tempering within 72 hours after rolling, and the steel plate with the thickness of more than 40mm is sent to the heat treatment furnace for tempering within 48 hours after rolling.
The invention has the beneficial effects that:
(1) c is a main strengthening element, can obviously improve the strength of the structure through interstitial solid solution strengthening and is an important element for improving the stability of austenite, but in order to obtain good low-temperature impact toughness and weldability, the content of C needs to be controlled in a reasonable range;
mn can improve the strength of the structure through solid solution strengthening, the reasonable Mn content can also greatly improve the stability of austenite, and the Mn content can improve the hardenability of steel, so that the steel can obtain martensite even full martensite in a very wide cooling speed range, and further a small amount of reverse transformation austenite is formed in the tempering of a two-phase region, the strength of the steel can be improved through the tempered martensite structure, the toughness and plasticity of the steel can be improved through the reverse transformation austenite structure, and the steel has excellent comprehensive mechanical properties;
si is a deoxidizing element in the steelmaking process, a proper amount of Si can inhibit segregation of Mn and P and improve toughness, the Si can inhibit formation of cementite, but the content cannot be too high, or the toughness of the material can be obviously reduced, and the Si is controlled to be 0.10-0.35%; under the condition of adding a certain Mn content, Mn is easy to form MnS with S so as to reduce the plasticity of steel, P is easy to segregate in grain boundaries, and the crack propagation resistance of the grain boundaries is reduced, so that the toughness is reduced, therefore, the content of P, S needs to be strictly controlled, and the invention requires that P is less than or equal to 0.010 percent and S is less than or equal to 0.003 percent;
ti can prevent the grain boundary migration at high temperature through the precipitation of a fine dispersed second phase, thereby refining grains and improving the comprehensive mechanical property of steel, and the addition amount is controlled within the range of 0.01-0.05 percent;
a certain amount of Cr can generate obvious solid solution strengthening effect, and is beneficial to improving the strength of steel; a proper amount of Ni can stabilize austenite phase, improve hardenability, reduce brittle transition temperature and is beneficial to improving welding performance; mo can improve the strength of the martensite after tempering, and can weaken the grain boundary segregation of Mn in a certain content range so as to improve the toughness, the content of Ni + Cr + Mo is controlled to be 0.7-1.2%, and the cost is not remarkably increased while the effects of the Ni + Cr + Mo are exerted;
(2) on the premise of keeping higher manganese content, the designed components can be added with no or less noble alloy elements, and the cost per ton of steel has great cost advantage compared with the cost of the traditional high-strength steel with the same grade;
(3) the microstructure of the product is composed of tempered martensite and a small part of reverse transformation austenite, the tempered martensite can ensure that the steel has high strength, the small part of reverse transformation austenite can ensure that the material has good plastic toughness and good hardenability under the condition of ensuring the high strength of the material, and the tempered martensite and the small part of reverse transformation austenite are all along the whole thickness direction;
(4) the thickness of the steel plate produced by the method is 12-50 mm, the comprehensive mechanical property of the steel plate reaches the technical requirement of Q800F steel in a GB/T16270-2009 high-strength structure quenched and tempered steel plate, and the yield ratio is not more than 0.88.
Drawings
FIG. 1 is a metallographic structure of the product of example 1 at a thickness of 1/2;
FIG. 2 is a metallographic structure of the product of example 1 at a thickness of 1/4.
Detailed Description
Example 1
The medium-manganese medium-thickness steel for 800MPa engineering machinery provided by the embodiment has a thickness of 16mm, and comprises the following chemical components in percentage by mass: c: 0.06%, Mn: 5.1%, Si: 0.26%, P: 0.007%, S: 0.001%, Ti: 0.035%, Ni + Cr + Mo: 0.92%, and the balance of Fe and inevitable impurities.
The manufacturing method comprises the following steps: and the molten iron enters a converter for smelting after desulfurization treatment so as to reduce the P, S content in the molten iron, wherein P: 0.007%, S: 0.001 percent; performing LF refining to complete the mass fraction alloying of each element, wherein the continuous casting drawing speed is 1.2m/min, a plate blank with the thickness of 320mm is obtained, and surface defects need to be cleaned; heating the plate blank to 1160 ℃, and soaking for 48 min; controlled rolling is carried out on the heated plate blank, wherein the initial rolling temperature of the first stage is 1030 ℃, the final rolling temperature is 945 ℃, the initial rolling temperature of the second stage is 882 ℃, and the final rolling temperature is 811 ℃; water cooling the rolled steel plate, wherein the average cooling rate is 5.1 ℃/s, and the surface re-reddening temperature of the cooled steel plate is lower than 200 ℃; and (4) conveying the rolled steel plate to a heat treatment furnace within 48 hours, immediately carrying out tempering heat treatment at the tempering temperature of 630 ℃ for soaking time of 35min, and air-cooling the tempered steel plate to the normal temperature.
Example 2
The medium-manganese medium-thickness steel for 800MPa engineering machinery provided by the embodiment has the thickness of 35mm, and comprises the following chemical components in percentage by mass: c: 0.065%, Mn: 5.3%, Si: 0.26%, P: 0.007%, S: 0.001%, Ti: 0.021%, Ni + Cr + Mo: 1.13%, and the balance of Fe and inevitable impurities.
The manufacturing method comprises the following steps: and the molten iron enters a converter for smelting after desulfurization treatment so as to reduce the P, S content in the molten iron, wherein P: 0.007%, S: 0.001 percent; performing LF refining to complete the mass fraction alloying of each element, wherein the continuous casting drawing speed is 1.2m/min, a plate blank with the thickness of 320mm is obtained, and surface defects need to be cleaned; heating the plate blank to 1150 ℃ and soaking for 48 min; rolling the heated plate blank under control, wherein the first-stage rolling temperature is 1030 ℃, the final rolling temperature is 940 ℃, the second-stage rolling temperature is 865 ℃, and the final rolling temperature is 825 ℃; water cooling the rolled steel plate, wherein the average cooling rate is 6.3 ℃/s, and the surface re-reddening temperature of the cooled steel plate is lower than 200 ℃; and (4) immediately carrying out tempering heat treatment after rolling, wherein the tempering temperature is 630 ℃, the soaking time is 77min, and the steel plate is air-cooled to the normal temperature after tempering.
Example 3
The medium-manganese medium-thickness steel for 800MPa engineering machinery provided by the embodiment has a thickness of 50mm, and comprises the following chemical components in percentage by mass: c: 0.075%, Mn: 5.5%, Si: 0.23%, P: 0.007%, S: 0.001%, Ti: 0.021%, Ni + Cr + Mo: 1.15%, and the balance of Fe and inevitable impurities.
The manufacturing method comprises the following steps: and the molten iron enters a converter for smelting after desulfurization treatment so as to reduce the P, S content in the molten iron, wherein P: 0.007%, S: 0.001 percent; performing LF refining to complete the mass fraction alloying of each element, wherein the continuous casting drawing speed is 1.2m/min, a plate blank with the thickness of 320mm is obtained, and surface defects need to be cleaned; heating the plate blank to 1125 ℃, and soaking for 55 min; controlling rolling of the heated plate blank, wherein the starting temperature of the first stage is 1025 ℃, the finishing temperature is 945 ℃, the starting temperature of the second stage is 870 ℃, and the finishing temperature is 845 ℃; water cooling the rolled steel plate, wherein the average cooling rate is 10.3 ℃/s, and the surface re-reddening temperature of the cooled steel plate is lower than 200 ℃; and (4) conveying the rolled steel plate to a heat treatment furnace within 72 hours, immediately carrying out tempering heat treatment at the tempering temperature of 620 ℃ for soaking for 110min, and air-cooling the tempered steel plate to the normal temperature.
The products of example 1, example 2 and example 3 were subjected to mechanical property tests, and the results are shown in the following table:
as can be seen from FIGS. 1 and 2, the microstructure of the product of example 1 is composed of tempered martensite and a small amount of reverse transformation austenite, the tempered martensite can ensure that the steel has high strength and the small amount of reverse transformation austenite can ensure that the steel has good ductility and toughness under the condition of ensuring the high strength of the material. From the table, the comprehensive mechanical properties of the product prepared by the method all meet the technical requirements of Q800F steel in the quenched and tempered steel plate for the GB/T16270-2009 high-strength structure, and simultaneously the yield ratio is not more than 0.88. The component design of the invention can not add or less noble alloy elements on the premise of keeping higher manganese content, and the cost per ton of steel has great cost advantage, excellent comprehensive performance and great cost advantage compared with the traditional high-strength steel with the same grade, so that the invention has wide application prospect.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (9)
1. The medium manganese medium-thickness steel for 800MPa engineering machinery is characterized in that: the chemical components and the mass percentage are as follows: c: 0.05-0.08%, Mn: 4.8% -5.8%, Si: 0.10-0.35%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, Ti: 0.01-0.05%, Ni + Cr + Mo: 0.7 to 1.2 percent, and the balance of Fe and inevitable impurities.
2. The medium manganese medium thickness steel for 800MPa engineering machinery as claimed in claim 1, wherein: the thickness of the product is 12-50 mm.
3. The medium manganese medium thickness steel for 800MPa engineering machinery as claimed in claim 1, wherein: the yield ratio of the product is less than or equal to 0.88.
4. The medium manganese medium thickness steel for 800MPa engineering machinery as claimed in claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.055% -0.080%, Mn: 4.85% -5.80%, Si: 0.11-0.35%, P is less than or equal to 0.009%, S is less than or equal to 0.002%, Ti: 0.015% -0.045%, Ni + Cr + Mo: 0.75 to 1.20 percent, and the balance of Fe and inevitable impurities.
5. The medium manganese medium thickness steel for 800MPa engineering machinery as claimed in claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.055% -0.080%, Mn: 4.85% -5.80%, Si: 0.11-0.35%, P is less than or equal to 0.009%, S is less than or equal to 0.002%, Ti: 0.015% -0.045%, Ni + Cr + Mo: 0.75 to 1.20 percent, and the balance of Fe and inevitable impurities.
6. A method for manufacturing the medium manganese medium thickness steel for 800MPa construction machinery according to any one of claims 1 to 5, wherein:
molten iron desulfurization treatment and converter smelting: p in molten steel is less than or equal to 0.010 percent, and S in molten steel is less than or equal to 0.003 percent;
LF refining: the alloying requirement of a component system is met;
continuous casting: the pulling speed is less than or equal to 1.5m/min, and surface defects are cleaned;
heating the plate blank: the temperature is 1080-1200 ℃;
rolling a plate blank: two-stage rolling is carried out, wherein the initial rolling temperature of one stage is less than or equal to 1030 ℃, the final rolling temperature is greater than or equal to 930 ℃, the initial rolling temperature of the two stages is less than or equal to 890 ℃, and the final rolling temperature is greater than or equal to 800 ℃;
ACC after rolling: the cooling rate is more than or equal to 1 ℃/s, and the surface red returning temperature of the steel plate after the cooling is stopped is less than or equal to 200 ℃;
heat treatment after rolling: the tempering temperature is 600-650 ℃, and the steel plate is air-cooled to normal temperature after tempering.
7. The manufacturing method of the medium manganese medium thickness steel for the 800MPa engineering machinery as claimed in claim 6, characterized in that: and a slab heating step, wherein soaking time is calculated by thickness x (1.2-2.5 min/cm).
8. The manufacturing method of the medium manganese medium thickness steel for the 800MPa engineering machinery as claimed in claim 6, characterized in that: and a step of heat treatment after rolling, wherein the soaking time is calculated by the plate thickness x (1.5-3 min/mm).
9. The manufacturing method of the medium manganese medium thickness steel for the 800MPa engineering machinery as claimed in claim 6, characterized in that: and (3) a post-rolling heat treatment step, namely feeding the rolled steel plates with the thickness of less than 40mm into a heat treatment furnace for tempering within 72 hours, and feeding the rolled steel plates with the thickness of more than 40mm into the heat treatment furnace for tempering within 48 hours.
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| CN202010584497.1A CN111778450A (en) | 2020-06-24 | 2020-06-24 | Medium-manganese medium-thickness steel for 800MPa engineering machinery and manufacturing method thereof |
| AU2020455074A AU2020455074B2 (en) | 2020-06-24 | 2020-10-22 | 800 MPa construction machinery medium-manganese medium-thickness steel and manufacturing method therefor |
| PCT/CN2020/122967 WO2021258584A1 (en) | 2020-06-24 | 2020-10-22 | 800 mpa construction machinery medium-manganese medium-thickness steel and manufacturing method therefor |
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| WO2021258584A1 (en) * | 2020-06-24 | 2021-12-30 | 南京钢铁股份有限公司 | 800 mpa construction machinery medium-manganese medium-thickness steel and manufacturing method therefor |
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| CN104630641B (en) * | 2014-12-11 | 2017-02-22 | 武汉钢铁(集团)公司 | 800MPa-grade high-strength high-plasticity low-carbon medium-manganese steel and manufacturing method thereof |
| EP3512967A1 (en) * | 2016-09-16 | 2019-07-24 | Salzgitter Flachstahl GmbH | Method for producing a re-shaped component from a manganese-containing flat steel product and such a component |
| KR102030815B1 (en) * | 2016-12-28 | 2019-10-11 | 연세대학교 산학협력단 | High intensity medium manganese steel forming parts for warm stamping and manufacturing method for the same |
| CN108660395B (en) * | 2018-05-30 | 2019-12-06 | 东北大学 | 690 MPa-grade low-carbon medium-manganese high-strength medium plate |
| EP3594368A1 (en) * | 2018-07-13 | 2020-01-15 | voestalpine Stahl GmbH | Medium manganese steel intermediate product with reduced carbon content and method for providing such a steel intermediate product |
| CN109652733B (en) * | 2019-01-07 | 2021-01-26 | 南京钢铁股份有限公司 | 690 MPa-grade super-thick steel plate and manufacturing method thereof |
| CN110714173A (en) * | 2019-07-25 | 2020-01-21 | 东莞材料基因高等理工研究院 | Low-carbon medium manganese steel medium plate containing epsilon martensite and preparation method thereof |
| CN110846577A (en) * | 2019-11-20 | 2020-02-28 | 南京钢铁股份有限公司 | 690 MPa-grade high-strength low-yield-ratio medium-thickness manganese steel and manufacturing method thereof |
| CN110983158B (en) * | 2019-12-16 | 2021-04-20 | 南京钢铁股份有限公司 | 550 MPa-grade medium manganese steel plate and manufacturing method thereof |
| CN111778450A (en) * | 2020-06-24 | 2020-10-16 | 南京钢铁股份有限公司 | Medium-manganese medium-thickness steel for 800MPa engineering machinery and manufacturing method thereof |
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2020
- 2020-06-24 CN CN202010584497.1A patent/CN111778450A/en not_active Withdrawn
- 2020-10-22 WO PCT/CN2020/122967 patent/WO2021258584A1/en active Application Filing
- 2020-10-22 AU AU2020455074A patent/AU2020455074B2/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021258584A1 (en) * | 2020-06-24 | 2021-12-30 | 南京钢铁股份有限公司 | 800 mpa construction machinery medium-manganese medium-thickness steel and manufacturing method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021258584A1 (en) | 2021-12-30 |
| AU2020455074A1 (en) | 2023-02-02 |
| AU2020455074B2 (en) | 2024-03-28 |
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