CN109161799B - Hot-rolled H-shaped steel for electrified railway contact net support and preparation method thereof - Google Patents
Hot-rolled H-shaped steel for electrified railway contact net support and preparation method thereof 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention provides hot-rolled H-shaped steel for an electrified railway contact net support and a preparation method thereof, wherein the hot-rolled H-shaped steel comprises the following chemical components in percentage by weight: 0.08 to 0.12 percent of C, 0.20 to 0.50 percent of Si, 1.45 to 1.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.01 to 0.03 percent of Nb, 0.05 to 0.07 percent of V, 0.006 to 0.012 percent of Ti, the balance of iron and inevitable trace impurities, and the carbon equivalent is controlled to be less than or equal to 0.43 percent. The preparation method comprises the following steps: molten iron pre-desulfurization → converter smelting → LF refining → near-net type shaped blank protection continuous casting → BD rough rolling-TM finish rolling mill arrangement type production line rolling → inspection warehousing. The high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net support column is characterized in that the yield strength is more than or equal to 390MPa, the low-temperature toughness at minus 40 ℃ is more than or equal to 37J, and the performance requirements of the high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net support column can be met.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to high-strength low-temperature-resistant steel for a railway strut and a preparation method thereof.
Background
In an electrified railway, a contact network is a main framework of railway electrification engineering and is used for an important task of directly transmitting electric energy obtained from a traction transformer to an electric locomotive for use. The most basic and widely applied supporting equipment in the contact network is a strut which is used for bearing the load of contact suspension and supporting equipment, and the existing hot-rolled H-shaped steel strut has basically replaced a reinforced concrete pole. For a construction unit, the construction strength is low, the speed is high, the construction period is short, and a large amount of manpower and material resources can be saved, so that the method is a necessary trend for future railway development in China. The hot-rolled H-shaped steel for the electrified railway contact net support column produced at present is usually 235 MPa and 345MPa, has the quality grade of B grade, and meets the requirement of 20 ℃ normal temperature impact energy. However, with the demand of construction and development of high-speed railways in China, the high-speed railways extend to areas such as cold areas, high-cold areas, sand storm areas and the like, so that the hot-rolled H-shaped steel support is required to have the advantages of high strength, high rigidity, strong bending resistance, good low-temperature toughness, good weldability, excellent processability and the like.
For hot-rolled H-shaped steel for electrified railway contact net struts in northeast and west areas of China with high wind speed, the yield strength of the hot-rolled H-shaped steel is required to reach 390MPa, and the low-temperature toughness at-40 ℃ is not lower than 37J. However, the current production method cannot meet the requirements of the hot-rolled H-shaped steel for the high-strength low-temperature-resistant electrified railway contact net support.
Disclosure of Invention
The invention aims to provide high-strength low-temperature-resistant hot-rolled H-shaped steel for an electrified railway contact net support column with good mechanical properties and a preparation method thereof. The hot-rolled H-shaped steel has high strength, good low-temperature resistance toughness and easy welding, the yield strength is more than or equal to 390MPa, the low-temperature toughness at minus 40 ℃ is more than or equal to 37J, and the performance requirements of the high-strength low-temperature resistance hot-rolled H-shaped steel for the overhead line system strut of the electrified railway can be met.
In order to achieve the purpose, the invention adopts the following technical scheme:
the hot-rolled H-shaped steel for the high-strength low-temperature-resistant electrified railway contact net support column comprises the following chemical components in percentage by weight: 0.08 to 0.12 percent of C, 0.20 to 0.50 percent of Si, 1.45 to 1.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.01 to 0.03 percent of Nb0.05 to 0.07 percent of V, 0.006 to 0.012 percent of Ti, the balance of iron and inevitable trace impurities, and the carbon equivalent is controlled to be less than or equal to 0.43 percent.
The invention also provides a preparation method of the high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net support, which comprises the following steps:
the molten iron is desulfurized by KR, and the sulfur content in the desulfurized molten iron is controlled not to exceed 0.010 wt%;
smelting in a converter by adopting a top-bottom combined blown converter, adopting a single slag method in a slagging mode, deoxidizing by adopting silico-calcium-barium and a compound deoxidizer in the tapping process of the converter, and alloying by adopting medium manganese, silico-manganese, vanadium-nitrogen and ferrocolumbium;
bottom blowing argon and stirring are carried out in the whole LF refining process, slag is fully stirred and melted in the refining process, and calcium carbide, silicon calcium barium and the like are used for adjusting furnace slag to produce white slag or yellow white slag; feeding a proper amount of titanium iron wires according to the components of the steel grade, and performing soft blowing operation on the molten steel after the adopted end-point components are qualified, wherein the soft blowing time is more than or equal to 8 minutes;
in the continuous casting process, a sleeve type protection pouring process is used, and near-net-shape profiled blank protection pouring is adopted; and rolling to obtain the hot-rolled H-shaped steel for the electrified railway contact net support.
Further, the desulfurizer used for molten iron desulphurization consists of lime powder, fluorite and the like, the added desulfurizer is 5-10 kg/t according to the original sulfur content of the molten iron, and the sulfur content in the desulfurized molten iron is controlled to be not more than 0.010 wt%.
Further, smelting in a converter by adopting a top-bottom combined blown converter in the smelting process, wherein the slagging mode is a single slag method, and the final slag alkalinity CaO%/SiO 2% is controlled to be 3.0-4.0; the slag is added 3 minutes before the end point, the slag is completely melted in the whole process, and the time of pressing the gun at the end point is more than or equal to 1 minute; deoxidizing by adopting silicon-calcium-barium and a composite deoxidizer, alloying by adopting medium manganese, silicon-manganese, vanadium-nitrogen and ferroniobium, starting to add when molten steel is discharged to 1/4, and finishing adding when the molten steel is discharged to 3/4; after steel is discharged, synthetic slag is added, and the adding amount is 5-15 kg/t.
Further, in the LF refining process, bottom blowing argon is carried out for stirring in the whole process; adjusting the slag by using calcium carbide, silicon calcium barium and the like, wherein the top slag is white slag or yellow white slag before leaving the station; feeding a proper amount of titanium iron wires according to the component requirements of the steel grade; and feeding pure calcium wires at the final stage of refining.
Further, a sleeve type protection pouring process is adopted for continuously casting the special-shaped blank; the secondary cooling adopts weak cooling; adopting special alloy steel covering slag; the tundish adopts a low-carbon alkaline covering agent.
Furthermore, in the rolling procedure, the soaking temperature of the heating furnace is 1250-1320 ℃, the starting rolling temperature is not lower than 1160 ℃, the finishing rolling temperature is not higher than 850 ℃, the rolled material adopts a cooling mode of natural cooling and water spray cooling in a cooling bed, and the straightening temperature is less than 100 ℃. According to the embodiment of the invention, the rolled material specification is the specification of the hot-rolled H-shaped steel for the common electrified railway pole contact net support, preferably the specification of H390 multiplied by 300 multiplied by 10 multiplied by 16 in the national standard GB/T34199-.
The invention mainly improves the strength by microalloying, the microalloying mainly applies niobium, vanadium and titanium composite microalloying, and the continuous casting process of the beam blank adopts a sleeve type protective pouring process. Therefore, the high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net support column has high strength and good mechanical property, the yield strength is more than or equal to 390MPa, the average yield strength is 410MPa, the low-temperature impact toughness at minus 40 ℃ is more than or equal to 37J, the average impact toughness is 45J, the carbon equivalent is controlled to be less than or equal to 0.43 percent in chemical composition design, and the performance requirements of the high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net support column can be. In addition, according to the method disclosed by the invention, the hot-rolled H-shaped steel for the electrified railway contact net support column, which is improved in strength, good in impact toughness and easy to weld, is obtained while the production cost is reduced.
Compared with the production of the hot-rolled H-shaped steel for the hot-rolled electrified railway contact net support at present, the technical scheme of the invention is characterized in that:
firstly, when smelting steel grades in a converter, silicon-calcium-barium and a composite deoxidizer are adopted for deoxidation, and the oxygen content in steel is less than 20ppm, so that clean steel with low oxygen content is produced.
And secondly, when the special-shaped blank is produced, the cleanliness of molten steel is improved under the condition of sleeve type protection casting, the constant drawing speed is realized, the quality of a casting blank is improved, and the high-strength and low-temperature-resistant hot-rolled H-shaped steel for the railway contact net support is produced.
Thirdly, a trace amount of niobium-vanadium-titanium alloy is added, the fine grain strengthening and precipitation strengthening mechanisms of niobium, vanadium and titanium are utilized, heat treatment is not needed after rolling, the component design and production of the high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net support are completed, and the alloy cost in the production process is reduced.
Fourthly, the hot-rolled H-shaped steel has good comprehensive mechanical properties, the average yield strength is 410MPa, the average tensile strength is 560MPa, the average elongation after fracture is 26 percent, and the-40 ℃ Charpy impact work (longitudinal direction) is 45J, so that the hot-rolled H-shaped steel is the hot-rolled H-shaped steel for the electrified railway contact net support with highest strength and best low-temperature toughness at present in China.
Detailed Description
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. Unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. The description is only for the purpose of facilitating understanding of the present invention and should not be construed as specifically limiting the present invention.
The invention mainly aims at the problems of components, smelting and rolling of high-strength low-temperature-resistant hot-rolled H-shaped steel for an electrified railway contact net support, and provides high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net support and a preparation method thereof. The hot-rolled H-shaped steel produced by the method has good mechanical property, the yield strength is more than or equal to 390MPa, the average yield strength is 410MPa, the low-temperature impact toughness at minus 40 ℃ is more than or equal to 37J, and the average yield strength is 45J; the carbon equivalent is controlled to be less than or equal to 0.43 percent in the chemical composition design, so that the easy weldability of the product is ensured.
The invention realizes the production of high-strength, low-temperature-resistant and easily-welded steel by mainly adopting niobium-vanadium-titanium composite microalloying, adopting profiled blank rolling and adopting a sleeve type protective pouring process in the continuous casting process.
The hot rolled H-section steel for a high-strength low-temperature-resistant electrified railway contact net post and the manufacturing method thereof according to the present invention will be described in detail below.
The high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net support column comprises the following chemical components in percentage by weight: 0.08 to 0.12 percent of C, 0.20 to 0.50 percent of Si, 1.45 to 1.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.01 to 0.03 percent of Nb, 0.05 to 0.07 percent of V, 0.006 to 0.012 percent of Ti, the balance of iron and inevitable trace impurities, and the carbon equivalent is controlled to be less than or equal to 0.43 percent.
According to the high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net strut, the carbon equivalent is controlled to be less than or equal to 0.43% in order to ensure the weldability of the steel, the design idea of low-carbon + niobium-vanadium-titanium composite microalloying process + low P, S control is adopted in the chemical composition design, and the low carbon can improve the weldability of the steel; the addition of trace niobium, vanadium and titanium microalloying elements plays roles in fine grain strengthening and precipitation strengthening, can effectively improve the strength of the product, refine grains and ensure that the product has the performance requirements of high strength and good low-temperature resistance toughness; the low P, S control is intended to improve molten steel purity, reduce harmful inclusions in the steel, and ensure high strength, good toughness stability of the product.
According to a preferred embodiment of the invention, the hot-rolled H-shaped steel for the high-strength low-temperature-resistant electrified railway contact net support column preferably comprises the following chemical components in percentage by weight: 0.09-0.12 percent of C, 0.25-0.45 percent of Si, 1.50-1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 0.015-0.030 percent of Nb, 0.050-0.065 percent of V, 0.006-0.010 percent of Ti, the balance of iron and inevitable trace impurities, and the carbon equivalent is controlled to be less than or equal to 0.42 percent.
According to the invention, the preparation method of the high-strength low-temperature resistant hot-rolled H-shaped steel for the electrified railway contact net support column comprises molten iron pre-desulfurization, converter smelting (such as 120-ton top-bottom combined blown converter smelting), LF refining, near-net-shape billet sleeve type protective continuous casting and rolling (such as BD rough rolling-TM finish rolling mill arrangement type production line rolling).
Specifically, according to the method, a desulfurizer used for molten iron desulphurization consists of lime powder, fluorite and the like, the added desulfurizer is 8-10 kg/t according to the original sulfur content of the molten iron, and the sulfur content in the desulfurized molten iron is controlled to be not more than 0.010 wt%;
according to the method, a top-bottom combined blown converter is adopted for smelting in the converter smelting process, the slagging mode is a single slag method, and the final slag alkalinity is CaO%/SiO2% is controlled to be 3.0-4.0; the slag is added 3 minutes before the end point, the slag is completely melted in the whole process, and the time of pressing the gun at the end point is more than or equal to 1 minute; deoxidizing by adopting silicon-calcium-barium and a composite deoxidizer, alloying by adopting medium manganese, silicon-manganese, vanadium-nitrogen and ferroniobium, starting to add when molten steel is discharged to 1/4, and finishing adding when the molten steel is discharged to 3/4; after steel is discharged, adding synthetic slag, wherein the adding amount is 8-12 kg/t; strictly performing slag stopping operation to reduce slag discharge; tapping time is not less than 3 minutes; the steel ladle adopts a red clean steel ladle with good bottom blowing, and the baking temperature is more than or equal to 800 ℃.
According to the method, in the LF refining process, argon is blown at the bottom in the whole process and stirred; adjusting the slag by using calcium carbide, silicon calcium barium and the like, wherein the top slag is white slag or yellow white slag before leaving the station; feeding a proper amount of titanium wires according to the component requirements of the steel grade; and feeding pure calcium wires at the final stage of refining.
In the LF refining process, bottom blowing argon is carried out for stirring in the whole process, the argon pressure can be properly increased in the early stage according to the condition, small-pressure soft blowing is adopted before the mixture is out of a station, impurities are guaranteed to float upwards, and the refining soft blowing argon is guaranteed to be more than 10 minutes; according to the viscosity, color and foaming degree of the slag, the slag is adjusted by calcium carbide, silicon calcium barium and the like, and the top slag is white slag or yellow white slag before leaving the station; feeding a ferrotitanium wire of 100-120 m and a pure calcium wire of 80-100 m/furnace in the last stage of refining; [ O ] in the steel at the refining station is less than 20 ppm.
According to the method, in the continuous casting process, the sleeve type protective pouring process is adopted for the continuous casting of the beam blank, the secondary cooling adopts weak cooling, and special alloy steel protective slag is adopted; the tundish adopts a low-carbon alkaline covering agent, and the adding amount is 1.0-1.8 Kg/tSteel(ii) a The cleanliness of molten steel is improved, constant-pulling-speed pouring is realized, and the quality of casting blanks is improved. Specifically, in the continuous casting process, weak cooling is adopted for secondary cooling, non-sinusoidal vibration is adopted for a crystallizer, the superheat degree of a tundish is controlled according to 15-25 ℃, a low-carbon alkaline covering agent is adopted for the tundish, and the adding amount of the covering agent is 1.0-1.5 kg/tSteel。
According to the method, in the rolling process, the soaking temperature of a heating furnace is 1250-1320 ℃, the starting rolling temperature is not lower than 1160 ℃, the final rolling temperature is not higher than 850 ℃, a rolled material adopts a cooling mode of natural cooling and water spray cooling in a cooling bed, and the straightening temperature is less than 100 ℃, so that the high-strength low-temperature resistant hot-rolled H-shaped steel for the electrified railway contact net support is obtained. According to one embodiment of the invention, the specification of the rolled stock can be H390X 300X 10X 16 in the national standard GB/T34199-2017.
In order to avoid obscuring the subject matter of the present invention, detailed descriptions of well-known techniques/procedures included herein will be omitted. Therefore, in the preparation method of the hot-rolled H-shaped steel for the high-strength low-temperature-resistant electrified railway contact net support column, the prior art can be adopted in the processes which are not mentioned here.
The hot rolled H-section steel for high-strength low-temperature resistant electrified railway contact network struts and the preparation method thereof according to the present invention will be further described with reference to specific examples, however, the present invention is not limited thereto.
Example 1
The hot-rolled H-shaped steel for the high-strength low-temperature-resistant electrified railway contact net support is prepared by the following process route: molten iron pre-desulfurization → converter smelting → LF refining → near-net type shaped blank protection continuous casting → BD rough rolling-TM finish rolling mill arrangement type production line rolling → inspection warehousing. The specific process parameters are as described above.
The chemical component weight percentages of the high-strength low-temperature-resistant hot-rolled H-shaped steel for the electrified railway contact net support column prepared by the embodiment are shown in table 1, the parameters of the converter smelting process are shown in table 2, the parameters of the continuous casting process are shown in table 3, and the mechanical properties of the obtained rolled material of the hot-rolled H-shaped steel for the electrified railway contact net support column are shown in table 4.
Table 1 chemical composition of example 1 (wt%)
TABLE 2 converter smelting Process parameters for example 1
Table 3 parameters of the continuous casting process of example 1
TABLE 4 mechanical Properties of rolled stock obtained in example 1
Therefore, the invention mainly realizes the excellent performances of high strength, good low-temperature toughness, easy welding and the like of the hot-rolled H-shaped steel for the electrified railway contact net strut by a low-carbon + niobium-vanadium-titanium composite microalloying process and a low P, S control process, wherein the steel billet adopts a special-shaped blank, and the continuous casting process adopts sleeve type protection casting. According to the preparation method of the hot-rolled H-shaped steel for the electrified railway contact net support, silicon-calcium-barium and a composite deoxidizer are adopted for deoxidation, and the oxygen content in the steel is less than 20 ppm. Therefore, the hot-rolled H-shaped steel for the electrified railway contact net support column produced by the method has good mechanical property, the average yield strength is 410MPa, the average tensile strength is 560MPa, the average elongation after fracture is 26%, and the Charpy impact work (longitudinal direction) at minus 40 ℃ is 45J.
The method can be realized by upper and lower limit values and interval values of intervals of process parameters (such as temperature, time and the like), and embodiments are not listed.
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. The preparation method of the hot-rolled H-shaped steel for the electrified railway contact net support is characterized in that the hot-rolled H-shaped steel comprises the following chemical components in percentage by weight: 0.08 to 0.12 percent of C, 0.20 to 0.50 percent of Si, 1.45 to 1.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.01 to 0.03 percent of Nb0.05 to 0.07 percent of V, 0.006 to 0.012 percent of Ti, the balance of iron and inevitable trace impurities, and the carbon equivalent is controlled to be less than or equal to 0.43 percent;
the preparation method comprises the following steps:
1) the molten iron is desulfurized by KR, and the sulfur content in the desulfurized molten iron is controlled not to exceed 0.010 wt%;
2) converter smelting, namely smelting by adopting a top-bottom combined blown converter, adopting a single slag method in a slagging mode, deoxidizing by adopting silicon-calcium-barium and a compound deoxidizer in the tapping process of the converter, alloying by adopting medium manganese, silicon-manganese, vanadium-nitrogen and ferrocolumbium, starting to add when molten steel is discharged to 1/4, and finishing adding when the molten steel is discharged to 3/4;
3) LF refining, wherein argon is blown at the bottom and stirred in the whole process, and slag is fully stirred and melted in the refining process to produce white slag or yellow and white slag; adding silicon-calcium-barium and a compound deoxidizer as required for deoxidation alloying, feeding a proper amount of titanium wire, and performing soft blowing operation on the molten steel after the adopted end-point components are qualified, wherein the soft blowing time is more than or equal to 8 minutes;
4) continuous casting, wherein in the continuous casting process, a sleeve type protection casting process is adopted, and a near-net-shape profiled blank is adopted for protection casting;
5) rolling to obtain hot-rolled H-shaped steel for the electrified railway contact net strut;
the desulfurizer used for molten iron desulphurization comprises lime powder and fluorite, and the added desulfurizer is 5-10 kg/t according to the original sulfur content of molten iron;
in the smelting process of a converter, the alkalinity of final slag is CaO%/SiO2% is controlled to be 3.0-4.0; the slag charge is added 3 minutes before the end point, and the time of pressing the gun at the end point is more than or equal to 1 minute; after steel is placed, adding synthetic slag, wherein the adding amount is 5-15 kg/t;
in the rolling process, the soaking temperature of the heating furnace is 1250-1320 ℃, the starting rolling temperature is not lower than 1160 ℃, the finishing rolling temperature is not higher than 850 ℃, the rolling material adopts a cooling mode of natural cooling and water spray cooling in a cooling bed, and the straightening temperature is less than 100 ℃.
2. The method according to claim 1, wherein in the continuous casting step, the secondary cooling is weak cooling; adopting special alloy steel covering slag; the tundish adopts a low-carbon alkaline covering agent.
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| CN105063485A (en) * | 2015-09-11 | 2015-11-18 | 山东钢铁股份有限公司 | 355MPa thick steel plate with low-temperature toughness and preparation method thereof |
| CN105177421B (en) * | 2015-10-08 | 2017-06-13 | 山东钢铁股份有限公司 | A kind of yield strength is 500MPa rank forklift truck transverse beam steel plate specials and preparation method thereof |
| CN107868907A (en) * | 2017-10-19 | 2018-04-03 | 山东钢铁股份有限公司 | High intensity pillar of electrification rail contacting net is with hot rolled H-shaped and preparation method thereof |
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