CN114427064A - Production method of high-strength high-low-temperature-toughness railway steel rail joint clamping plate - Google Patents
Production method of high-strength high-low-temperature-toughness railway steel rail joint clamping plate Download PDFInfo
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- CN114427064A CN114427064A CN202111449607.4A CN202111449607A CN114427064A CN 114427064 A CN114427064 A CN 114427064A CN 202111449607 A CN202111449607 A CN 202111449607A CN 114427064 A CN114427064 A CN 114427064A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B11/00—Rail joints
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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
- C21D2211/005—Ferrite
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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
- C21D2211/009—Pearlite
Abstract
The invention relates to the field of production of steel for connecting railway rails, and discloses a method for producing a high-strength high-low-temperature-toughness railway rail joint splint, which aims at solving the problems of low strength and poor low-temperature toughness of the railway rail joint splint in the prior art, and provides the following scheme, comprising the following steps of: and S1, steel making, namely smelting the molten steel into molten steel by adopting a 100t oxygen top-bottom combined blown converter, and refining for 40-45min at 100t LF. And S2, continuous casting, wherein the whole-process protection casting is adopted, the secondary pollution of molten steel is prevented, the casting blank quality is improved, and a square billet of 1502mm is cast in a six-flow square billet continuous casting machine, and the drawing speed is 2.3-2.5 mpm. The method is clear and simple to operate, improves the hardenability of the steel without reducing the toughness of the steel, has elements with certain corrosion resistance, has certain corrosion resistance to acid, alkali, salt and atmosphere, and has obvious effect and wide popularization and application.
Description
Technical Field
The invention relates to the field of production of steel for railway steel rail connection, in particular to a production method of a high-strength high-low-temperature-toughness railway steel rail joint clamp plate.
Background
The rail joint clamping plate mainly plays a role in connecting two ends of the rail and bears larger shearing stress. With the continuous development of economic scale at home and abroad and railway transportation industry, railway freight transport capacity and speed increasing capacity are improved, the material and performance of the steel rail meet the new changes at present, but the new variety of the steel rail joint splint has a slow changing speed, can meet the mechanical property only, but does not reflect the toughness requirement, particularly low-temperature toughness. For example, the current national railway rail joint splint still implements the national railway industry standard TB/T2345-2008 < 43kg/m-75kg/m rail joint splint ordering technical conditions >, the standard only has 2 steel grades, namely 55 and 56Nb, and only specifies the mechanical properties of the two grades, and has no requirement on impact toughness.
In recent years, along with the construction of Tibet railways in China and the improvement of the cargo carrying capacity of railways in foreign North America regions, the cold regions have higher requirements on the service performance of the steel rails and the steel rail joint splints of the railways, the strength of the steel rail joint splints is required to meet the requirements, the low-temperature toughness of the steel rail joint splints is also required, and the steel rail joint splints of the railways are required to have the characteristic that the impact energy is more than or equal to 27J under the cold condition of minus 40 ℃, so that the problem that the steel rail joint splints of the cold regions are frequently replaced is solved, the operation efficiency of the railways is improved, and the labor intensity is reduced. The technical acceptance conditions of a certain North American user for requiring a railway steel rail joint clamping plate are as follows: the yield strength Rel or Rp0.2 is more than or equal to 530MPa, the tensile strength Rm is more than or equal to 760MPa, the elongation A50 is more than or equal to 12 percent, the face shrinkage is more than or equal to 25 percent, the V-notch impact value at minus 40 ℃ is more than or equal to 27J, and the cold bending angle D is 3a and 180 degrees are intact. In order to meet the technical performance requirements, the invention provides the steel AG30 for the high-strength and high-low temperature toughness railway steel rail joint splint, which adopts a medium carbon component system, and is added with a proper amount of micro alloy elements such as Cr, Ni and the like, so that the strength and the low temperature toughness of the material are fully considered, and the service life of the railway steel rail joint splint which is increasingly developed in alpine regions is met.
In the production of low-temperature railway rail joint splints, the following patents exist: patent publication No. CN 101838776A "high-strength low-temperature toughness steel", the chemical components of the steel are slightly high in C content and high in Mn, and Mo element is added, so that the obtained product has higher performance; the patent publication No. CN 1375573 'YW 35 steel and application thereof', the chemical components of the patent steel have higher C content, and the performance of the obtained product is slightly lower by adopting a trace element component system of Mo, V, Nb, Cu and the like, therefore, the scheme designs a production method of the high-strength high-low-temperature toughness railway steel rail joint clamp plate.
Disclosure of Invention
The invention provides a production method of a high-strength high-low-temperature toughness railway steel rail joint clamp plate, which solves the problems of low strength and poor low-temperature toughness of the railway steel rail joint clamp plate in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method of a high-strength high-low-temperature toughness railway steel rail joint clamp plate comprises the following steps:
and S1, steel making, namely smelting the molten steel into molten steel by adopting a 100t oxygen top-bottom combined blown converter, and refining for 40-45min at 100t LF.
And S2, continuous casting, wherein the whole-process protection casting is adopted, the secondary pollution of molten steel is prevented, the casting blank quality is improved, and a square billet of 1502mm is cast in a six-flow square billet continuous casting machine, and the drawing speed is 2.3-2.5 mpm.
S3, heating and rolling, namely heating 1502mm square billets to 1200-1250 ℃ in a steel pushing type heating furnace, rolling 13 times on three phi 450mm section steel (with hole patterns) rolling machines to form 43-75 kg/m steel rail joint clamping plates, wherein the final rolling temperature is 980-1030 ℃, and then performing segmented sawing according to the ordered length.
S4, punching and dimension inspection, namely punching the cut railway steel rail joint clamping plate according to a production standard, and inspecting the punched railway steel rail joint clamping plate to ensure that the product is qualified;
s5, heating in a heat treatment furnace, namely, putting the punched steel rail joint clamp plate into a heating furnace for heating, wherein the heating temperature is 920-950 ℃, and the heat preservation time is 40-60 min.
And S6, quenching, namely, sending the heated steel rail joint clamping plate into cooling water with the water temperature of 55-75 ℃ for 60-70S.
S7, tempering, namely, sending the quenched steel rail joint clamping plate into a tempering furnace for high-temperature tempering at 580-610 ℃ for 60-70min, and then air-cooling to room temperature.
And S8, packaging and delivering the finished product after cooling.
Preferably, in the first step, 100t of converter smelting and LF furnace refining are adopted, and the refining time is 40-45min to ensure that the chemical components (by mass fraction) are as follows: 0.18 to 0.25 percent of C, 0.15 to 0.40 percent of Si, 80 to 1.20 percent of Mn O, less than or equal to 0.030 percent of P, less than or equal to 0.020 percent of S, 0.020 to 0.050 percent of Al, 0.40 to 0.60 percent of Cr, 0.30 to 0.60 percent of Ni, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities.
Preferably, in the steps S5 and S6, during the quenching treatment, the split rail joint clamp plate is gradually heated at 920-950 ℃ for 40-60min, and then the heated rail joint clamp plate is sent into cooling water with the water temperature of 55-75 ℃ for 60-70S.
Preferably, in the step S7, the tempering treatment is performed, in which the quenched rail joint clamp plate is sent into a tempering furnace for high-temperature tempering treatment, the tempering temperature is 580-610 ℃, and the tempering heat preservation time is 60-70 min.
In the invention:
in the actual components, firstly, a medium-low carbon component system is considered and selected, the content of C is 0.18-0.25%, a lath martensite structure is easily obtained during quenching, a tempered sorbite structure is obtained after tempering, the performance stability is facilitated, and then, trace elements Cr and Ni are reasonably selected, wherein Cr and C and Fe in steel form alloy cementite (FeCr)3C and alloy carbide (FeCr)7C3 which can be partially dissolved in a solid solution to strengthen a matrix and improve the hardenability of the steel; ni element and iron exist in alpha phase and gamma phase in steel in a mutual soluble form, improve the low temperature performance of the steel, strongly stabilize austenite, improve the hardenability of the steel without reducing the toughness of the steel, simultaneously have elements with certain corrosion resistance, have certain corrosion resistance to acid, alkali, salt and atmosphere, and the nickel-containing low alloy steel also has higher corrosion fatigue resistance.
Drawings
FIG. 1 is a phase diagram of a clamp plate of a rail joint of 43 kg/m.
FIG. 2 is a phase diagram of a 60kg/m rail joint clamp plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
Referring to fig. 1-2, a method for producing a high-strength high-low temperature toughness railroad rail joint clamp plate includes:
1) steelmaking, smelting by using a 100t oxygen top-bottom combined blown converter, then refining to 100t LF, wherein the refining time is 42min, the tapping temperature is 1550 ℃, and the chemical components (by mass fraction) during tapping are as follows: 0.20% of C, 0.12% of Si, 1.06% of Mn, 0.015% of P, 0.003% of S, 0.031% of Al, 0.45% of Cr, 0.45% of Ni, 0.0039% of N, and the balance of Fe and inevitable impurities.
2) Continuous casting, adopting full-process protection casting to prevent secondary pollution of molten steel, and casting into 1502mm square billets in a 6-flow square billet continuous casting machine, wherein the drawing speed is 2.38 mpm.
3) Heating and rolling, namely heating 1502mm square billets to 1230 ℃ in a steel pushing type heating furnace, and rolling the square billets to 43kg/m steel rail joint splints on three phi 450mm section steel (with hole patterns) rolling mills in 13 passes in total, wherein the final rolling temperature is 995 ℃. Then, the segmental sawing is carried out according to the ordered length of 890 mm.
4) And (3) heating in a heat treatment furnace, namely putting the slit railway steel rail joint clamping plate into a heating furnace for heating, wherein the heating temperature is 938 ℃ and the heat preservation time is 55 min.
5) And (3) quenching treatment, namely feeding the heated steel rail joint clamping plate into cooling water with the water temperature of 68 ℃ for 67 s.
6) And (3) tempering, namely conveying the quenched steel rail joint clamping plate into a tempering furnace for high-temperature tempering at 598 ℃ for 64min, and then air-cooling to room temperature.
7) The product performance is detected, and the detection result is as follows: the yield strength is 720MPa, the tensile strength is 846MPa, the elongation is 23%, the face shrinkage is 50%, the V-notch impact value at minus 40 ℃ is 106J, and the cold bending angle D is 3a and 180 degrees are intact.
8) And (3) detecting a metallographic structure to obtain a tempered sorbite + partial proeutectoid ferrite metallographic structure shown in the figure 1.
Example 2
1) Smelting steel by using a 100t oxygen top-bottom combined blown converter, then refining to 100t LF, wherein the refining time is 44min, the tapping temperature is 1553 ℃, and the chemical components (by mass fraction) during tapping are as follows: 0.22% of C, 0.23% of Si, 1.05% of Mn, 0.011% of P, 0.004% of S, 0.037% of Al, 0.46% of Cr, 0.47% of Ni, 0.0041% of N, and the balance of Fe and inevitable impurities.
2) Continuous casting, adopting whole-course protective casting to prevent secondary pollution of molten steel, and casting into 1502mm square billets in a 6-flow square billet continuous casting machine, wherein the drawing speed is 2.45 mpm.
3) Heating and rolling, namely heating 1502mm square billets to 1235 ℃ in a push steel type heating furnace, and rolling the square billets on three phi 450mm section steel (with hole patterns) rolling mills for 13 times to form 60kg/m steel rail joint splints, wherein the final rolling temperature is 1020 ℃. Then, the segmental sawing is carried out according to the ordered length of 890 mm.
4) Heating in a heat treatment furnace, namely putting the slit rail joint clamping plate into a heating furnace for heating, wherein the heating temperature is 925 ℃, and the heat preservation time is 45 min.
5) And (3) quenching treatment, namely feeding the heated steel rail joint clamping plate into cooling water with the water temperature of 65 ℃ for 62 s.
6) And (3) tempering, namely conveying the quenched steel rail joint clamping plate into a tempering furnace for high-temperature tempering at 605 ℃ for 68min, and then air-cooling to room temperature.
7) The product performance detection result is as follows: the yield strength is 680MPa, the tensile strength is 838MPa, the elongation is 25%, the face shrinkage is 55%, the V-notch impact value at minus 40 ℃ is 115J, and the cold bending angle D is 3a and 180 degrees are intact.
8) And (3) detecting a metallographic structure to obtain a tempered sorbite + partial proeutectoid ferrite metallographic structure shown in the figure 1.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The production method of the high-strength high-low-temperature-toughness railway steel rail joint splint is characterized by comprising the following steps of:
s1, steel making, namely smelting the molten steel into molten steel by adopting a 100t oxygen top-bottom combined blown converter, and refining the molten steel in 100t LF for 40-45 min;
s2, continuous casting, wherein the whole-process protection casting is adopted, the secondary pollution of molten steel is prevented, the casting blank quality is improved, and a 1502mm square blank is cast in a six-flow square blank continuous casting machine, and the drawing speed is 2.3-2.5 mpm;
s3, heating and rolling, namely heating 1502mm square billets to 1200-1250 ℃ in a steel pushing type heating furnace, rolling 13 times on three phi 450mm section steel (with hole patterns) rolling machines to form 43kg/m-75kg/m steel rail joint clamping plates, wherein the final rolling temperature is 980-1030 ℃, and then performing segmented sawing according to the ordered length;
s4, punching and dimension inspection, namely punching the cut railway steel rail joint clamping plate according to a production standard, and inspecting the punched railway steel rail joint clamping plate to ensure that the product is qualified;
s5, heating in a heat treatment furnace, namely, putting the punched steel rail joint clamp plate into a heating furnace for heating, wherein the heating temperature is 920-950 ℃, and the heat preservation time is 40-60 min;
s6, quenching, namely, sending the heated steel rail joint clamping plate into cooling water with the water temperature of 55-75 ℃ for 60-70S;
s7, tempering, namely delivering the quenched steel rail joint clamping plate into a tempering furnace for high-temperature tempering at 580-610 ℃ for 60-70min, and then air-cooling to room temperature;
and S8, packaging and delivering the finished product after cooling.
2. The method for producing the high-strength and low-temperature toughness railway steel rail joint clamp plate according to claim 1, wherein in the step S1, 100t converter smelting and LF furnace refining are adopted, and the refining time is 40-45min, so that the chemical components (by mass fraction) are as follows: 0.18 to 0.25 percent of C, 0.15 to 0.40 percent of Si, 0.80 to 1.20 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.020 percent of S, 0.020 to 0.050 percent of Al, 0.40 to 0.60 percent of Cr, 0.30 to 0.60 percent of Ni, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities.
3. The method for producing a high-strength and low-temperature toughness clamping plate for a railroad rail joint as claimed in claim 1, wherein in the steps S5 and S6, the split clamping plate for a railroad rail joint is gradually heated at 920-950 ℃ for 40-60min and then is put into cooling water at 55-75 ℃ for 60-70S.
4. The method for producing a high-strength high-low temperature toughness railway rail joint clamp plate as claimed in claim 1, wherein in S7, the steel rail joint clamp plate after quenching is sent into a tempering furnace for high-temperature tempering treatment, the tempering temperature is 580-610 ℃, and the tempering heat preservation time is 60-70 min.
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| CN202111449607.4A CN114427064A (en) | 2021-11-30 | 2021-11-30 | Production method of high-strength high-low-temperature-toughness railway steel rail joint clamping plate |
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| CN202111449607.4A CN114427064A (en) | 2021-11-30 | 2021-11-30 | Production method of high-strength high-low-temperature-toughness railway steel rail joint clamping plate |
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| CN111534740A (en) * | 2020-04-17 | 2020-08-14 | 南京钢铁股份有限公司 | 550MPa anti-fatigue high-strength high-toughness steel plate and manufacturing method thereof |
| AU2020103572A4 (en) * | 2018-05-25 | 2021-02-04 | Nanjing Iron & Steel Co., Ltd. | Ultra-fine grained high-strength steel plate with 1100 mpa-grade yield strength and production method thereof |
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2021
- 2021-11-30 CN CN202111449607.4A patent/CN114427064A/en not_active Withdrawn
Patent Citations (6)
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|---|---|---|---|---|
| CN101586450A (en) * | 2009-04-29 | 2009-11-25 | 天津钢管集团股份有限公司 | Have high strength and high toughness petroleum casing pipe and manufacture method thereof |
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| CN103469107A (en) * | 2013-09-18 | 2013-12-25 | 济钢集团有限公司 | A517Gr.B large pressure steel plate with low cost and high toughness and production method thereof |
| AU2020103572A4 (en) * | 2018-05-25 | 2021-02-04 | Nanjing Iron & Steel Co., Ltd. | Ultra-fine grained high-strength steel plate with 1100 mpa-grade yield strength and production method thereof |
| CN111363973A (en) * | 2020-03-11 | 2020-07-03 | 江阴兴澄特种钢铁有限公司 | Super-thick container steel plate with excellent core low-temperature impact toughness and manufacturing method thereof |
| CN111534740A (en) * | 2020-04-17 | 2020-08-14 | 南京钢铁股份有限公司 | 550MPa anti-fatigue high-strength high-toughness steel plate and manufacturing method thereof |
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