CN112522601A - Process method for producing Nb-containing low-cost small-medium-specification hot-rolled H-shaped steel - Google Patents
Process method for producing Nb-containing low-cost small-medium-specification hot-rolled H-shaped steel 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
- 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
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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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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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- 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
- B21B2001/225—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 by hot-rolling
Abstract
The invention discloses a process method for producing Nb-containing low-cost small and medium-sized hot-rolled H-shaped steel, which comprises a smelting process and a rolling process, wherein the components of the product are reasonably designed, the content of manganese is reduced except for adding niobium alloy, the mechanical property of the product meets the low-temperature impact requirement by optimizing the production process method, the production and the manufacture can be carried out by the simplest and most convenient and efficient method, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a process method for producing Nb-containing low-cost small and medium-sized hot-rolled H-shaped steel.
Background
The new national standard GB/T1591-2018 low-alloy high-strength structural steel is implemented in 2019 in 3 months, wherein the upper yield strength of the mark Q355B is more than 355MPa, the tensile strength range is 470-630 MPa, the impact at 20 ℃ is more than or equal to 34J, and the carbon equivalent CEV is less than or equal to 0.45. In the old national standard GB/T1591-2008 low-alloy high-strength structural steel, the lower yield strength of the mark Q345B is more than 345MPa, the tensile strength range is 470-630 MPa, the low-temperature impact at 20 ℃ is more than or equal to 34J, and the CEV is less than or equal to 0.44. From the viewpoint of the change in the standard, the strength tends to meet the european standard with a slight increase in the carbon equivalent. In the national standard GB1591-2008 low-alloy high-strength structural steel, Q345B is obtained by adopting a V microalloying mode to obtain low-temperature impact property for realizing the production of the steel grade at home.
Aiming at the current situation of low corrosion of the domestic steel market, the aim of reducing the production cost of steel is pursued by steel mills while ensuring the product quality to meet the product performance. The invention only adds the ferrocolumbium with lower cost in the alloy elements and reduces the manganese content in the steel so as to meet the requirement of the performance of low-cost steel. The invention produces 1.9924 ten thousand tons of low-cost niobium-containing special-shaped blanks in a large scale, the blanks are rolled into small and medium specifications of H150-H400, the product performance meets the technical requirements, the blanks are sent to users for use, and the surface quality of finished products is good. The chemical components of the low-cost niobium-containing hot-rolled H-shaped steel are designed, and the technical performance of the section steel is achieved through reasonable matching of niobium microalloy, carbon adjustment and manganese content reduction.
The purchase price of the niobium-iron alloy in the domestic market in 9 months in 2018 is 17 ten thousand yuan/ton, the purchase price of the vanadium-iron alloy is 31 ten thousand yuan/ton, the purchase price of the vanadium-nitrogen alloy is 32 ten thousand yuan/ton, the purchase price of the vanadium-nitrogen alloy in 9 months in 2019 is adjusted back to 21 ten thousand yuan/ton, and the purchase price of the niobium-iron alloy is 18 ten thousand yuan/ton. The method is characterized in that the manganese content in steel is reduced in a mode of substituting niobium for vanadium, so that the aims of reducing the alloy cost in steel and increasing the profit of a hot-rolled H-shaped steel product are fulfilled, and therefore the vanadium-niobium alloy can be switched to be used at any time according to the fluctuation of the price of the alloy in the market.
Disclosure of Invention
The invention aims to provide a process method for producing Nb-containing low-cost small and medium-sized hot-rolled H-shaped steel, which has low alloy cost and good toughness matching.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a process method for producing Nb-containing low-cost small and medium-sized hot-rolled H-shaped steel, which comprises the following steps:
1) composition control range
C% is less than or equal to 0.20%, Si% is less than or equal to 0.50%, and Mn%: 1.20-1.30 percent, P percent is less than or equal to 0.025 percent, S percent is less than or equal to 0.025 percent, Nb percent is less than or equal to 0.020 percent, gases in steel do not need to be treated, and the balance of Fe and inevitable impurities;
2) carbon equivalent
Carbon equivalent CEV is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15, CEV is less than or equal to 0.45;
3) process route
The steel-making process comprises the following steps: blast furnace molten iron-molten iron pretreatment-converter top and bottom combined blowing smelting-LF external refining-beam blank continuous casting
The steel rolling process comprises the following steps: feeding, a step heating furnace, high-pressure water once dephosphorization, BD, CCS universal rolling, hot saw sampling, step cooling bed cooling, straightening, appearance and surface quality inspection, saw cutting, packaging, warehousing and outward sending;
wherein:
the smelting conditions are as follows: the raw materials and alloy materials are required to meet the requirements of standard specification, the molten iron is pretreated, the molten iron is desulfurized, and the requirement P is less than or equal to 0.120 percent;
and (3) converter end point control: c is more than or equal to 0.06 percent, P is less than 0.020 percent, and the tapping temperature is more than or equal to 1640 ℃; deoxidizing and alloying silicon, manganese and ferromanganese, finally deoxidizing aluminum, tapping and pushing off slag;
the refining is as follows: refining white slag, wherein Ar blowing is carried out in the whole process according to a refining rule, and the soft blowing time is more than 8 minutes; desulfurizing, fine adjusting and heating up according to the components and temperature of the molten steel in the converter
The continuous casting comprises the following steps: liquidus temperature TL 1511 ℃, superheat degree of molten steel: delta T is less than or equal to 35 ℃, and the constant pulling speed operation is adopted;
the hot rolling comprises the following steps: the steel mill sends the steel billets to a steel mill after ensuring that the surface quality and the internal quality of the steel billets do not exist; in the steel rolling mill, visual inspection is carried out again before the casting blank is put into the heating furnace, and the steel blank with scabs, cracks and tilted skin is picked out; the rolling start temperature is 1150 +/-50 ℃, after the BD is cogging, the CCS frame is used for rolling, and the front temperature of the CCS finishing mill is 880-930 ℃;
and (4) carrying out high-pressure water descaling.
Further, the steel comprises the following chemical components in percentage by weight: 0.19% of C, 0.30% of Si, 1.24% of Mn1, 0.015% of P, 0.009% of S, 0.017% of Nb0.017% and the balance of Fe and inevitable impurities.
Furthermore, delta T is less than or equal to 30 ℃ in the continuous casting process.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention reasonably designs the components, reduces the manganese content except adding niobium alloy, ensures that the mechanical property of the alloy meets the low-temperature impact requirement by optimizing the production process method, can be produced and manufactured by the simplest and most convenient and efficient method, and reduces the production cost.
Detailed Description
A process method for producing Nb-containing low-cost small and medium-specification hot-rolled H-shaped steel comprises the following steps:
1 ingredient control
1.1 ingredient control Range
C% is less than or equal to 0.20%, Si% is less than or equal to 0.50%, and Mn%: 1.20 to 1.30 percent, less than or equal to 0.025 percent of P percent, less than or equal to 0.025 percent of S percent, less than or equal to 0.020 percent of Nb percent, no requirement on gas in steel, and the balance of Fe and inevitable impurities. The production process comprises the steps of converter-LF refining-special-shaped blank continuous casting-casting blank surface cleaning-universal mill rolling H-shaped steel-straightening.
1.2 carbon equivalent
Carbon equivalent CEV is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15, and CEV is less than or equal to 0.45.
2 mechanical Properties
The mechanical properties are specified in table 1.
TABLE 1 mechanical Properties
3 Standard
The patent relates to H150-H400 medium and small-sized hot-rolled H-shaped steel.
4.1 route of the Process
The steel-making process comprises the following steps: blast furnace molten iron-molten iron pretreatment-converter top and bottom combined blowing smelting-LF external refining-beam blank continuous casting
The steel rolling process comprises the following steps: feeding, step heating furnace, high-pressure water one-time dephosphorization, BD, CCS universal rolling, hot saw sampling, step cooling bed cooling, straightening, appearance and surface quality inspection, saw cutting, packaging, warehousing and external sending
4.2 smelting conditions
The raw materials and alloy materials are required to meet the requirements of standard specification, the molten iron is pretreated, the molten iron is desulfurized, and the P is required to be less than or equal to 0.120 percent.
4.3 revolving furnace
The control target values of the converter end point are that C is more than or equal to 0.06 percent, P is less than 0.020 percent, and the tapping temperature is more than or equal to 1640 ℃; the silicon-manganese and ferromanganese are adopted for deoxidation alloying, aluminum is finally deoxidized, and steel tapping and slag stopping are carried out.
4.4 refining
And (3) refining the white slag, wherein Ar blowing is carried out in the whole process according to the refining rule, and the soft blowing time is more than 8 minutes. And performing desulfurization, fine adjustment of components and heating operation according to the components and the temperature of the molten steel of the converter. The requirements for refining the components for the casting machine are shown in 3.
Table 3 refining for caster the composition requirement units: is based on
| C | Si | Mn | P | S | Nb |
| 0.19 | 0.35 | 1.25 | ≤0.020 | ≤0.020 | 0.015 |
4.5 continuous casting
Liquidus temperature TL 1511 ℃, superheat degree of molten steel: delta T is less than or equal to 35 ℃, the target delta T is less than or equal to 30 ℃, and the constant pulling speed operation is adopted.
4.6 Hot Rolling
4.6.1 furnace
The steel mill sends the steel billets to the steel mill after ensuring that the steel billets have no surface quality and no internal quality. And the steel rolling mill performs visual inspection again before the casting blank is put into the heating furnace, and the steel blank with scabs, cracks and tilted skin is picked out. The rolling start temperature is 1150 +/-50 ℃, after the BD is cogging, the CCS frame (universal mill) rolls, and the temperature before the CCS final mill is 880-930 ℃.
4.6.2 high-pressure water descaling.
5 inspection rules
5.1 quality of casting blank
And executing the inspection rule of Q/BG526-2015 continuous casting of the special blank.
5.2 non-metallic inclusions
The non-metallic inclusion rating of the steel material was performed in GB/T10561-2005, see Table 4.
TABLE 4 inclusion requirement level Unit level
| A | B | C | D | Ds |
| ≤1.5 | ≤1.5 | ≤1.5 | ≤2.0 | ≤2.0 |
The present invention will be described in further detail with reference to examples.
Example 1
The chemical components (weight percentage) of the steel are as follows: 0.19 of C, 0.30 of Si, 1.24 of Mn1, 0.015 of P, 0.009 of S, 0.017 of Nb0.017 and the balance of Fe and inevitable impurities. The production method sequentially comprises a 100t converter, external refining, continuous casting, heating, BD cogging and universal rolling.
In order to compare the influence of vanadium-nitrogen alloy and ferrocolumbium on the performance of hot-rolled H-shaped steel products, the vanadium-nitrogen alloy is added at a refining position in the first half part of continuous casting of one casting in the industrial trial production process, the ferrocolumbium is added at the refining position in the second half part, and the chemical components of microalloyed casting blanks in two modes are shown in the table 5. The contents of carbon, silicon, sulfur and phosphorus in the two design components are the same, the contents of vanadium and niobium in the finished product are the same, but the manganese content in the Nb-containing steel is obviously reduced compared with the manganese content in the V-containing steel.
In the production process, the carbon content in the smelting process is controlled according to the upper limit of the designed components in order to ensure the product performance because the manganese content of the Nb microalloyed hot-rolled H-shaped steel is reduced; in order to compare the performance differences of the two components, the smelting process ensures that the V-containing and Nb-containing special-shaped blanks are cast at the same time, and the rolling process adopts the same heating temperature, the same initial rolling temperature and the same final rolling temperature. The key of the heating temperature is to promote the micro-alloying elements to be fully dissolved in the steel, and the cogging temperature is controlled to be 1080-1200 ℃. Rolling in an austenite non-recrystallization region, wherein the temperature range is generally 950-Ar 3, so that the start rolling temperature of a universal rolling mill is controlled to be 920-980 ℃, the finish rolling temperature is controlled to be below 950 ℃, and the product performance of the low-alloy H-shaped steel is ensured.
TABLE 5 chemical composition (mass fraction)%
| C | Si | Mn | P | S | V | Nb | N |
| ≤0.20 | ≤0.5 | ≤1.55 | ≤0.025 | ≤0.025 | ≤0.020 | ≤0.012 | |
| ≤0.20 | ≤0.5 | ≤1.30 | ≤0.025 | ≤0.025 | ≤0.020 | ≤0.012 |
The mechanical property data of the hot rolled H-shaped steel containing V and Nb which is produced by industrial trial production are respectively counted and shown in the table 6 and the table 7. The V-containing hot-rolled H-shaped steel accounts for 1150 furnaces, the Nb-containing hot-rolled H-shaped steel accounts for 221 furnaces, the statistical data show that the small and medium specification product performances under two microalloying modes meet the technical requirements, the average values of the tables 7 and 8 show that the yield strength of the V-containing hot-rolled H-shaped steel is slightly lower than that of the Nb-containing hot-rolled H-shaped steel by 5-10MPa, the tensile strength has no obvious trend, the room-temperature impact toughness is basically the same, and the impact value is stable and has no fluctuation.
The stable performance and small fluctuation are ensured by controlling and optimizing the smelting process, the heating system, the initial rolling temperature, the final rolling temperature and other key processes of the low-cost Nb-containing hot-rolled H-shaped steel; realizes the mass production and supply of products.
TABLE 6 statistics of V-containing hot-rolled H-section
TABLE 7 statistics of Nb-containing hot-rolled H-section
The invention has the advantages that: compared with products containing V and Nb, the P, S elements in the products are relatively stable in mean value and small in standard deviation, which shows that the two elements in the design components have no influence on the yield strength, but the standard deviations of Mn, V and Nb are large, and the final product performances tend to be consistent, which shows that Mn, V and Nb have large influence on the yield strength. The main elements influencing the yield strength of the low-alloy H-shaped steel are C, Si, Mn, V and Nb, the strength is increased along with the increase of the content of C, Mn and Si, but the influence of the C element is most remarkable. The content of the internal control component C in actual production is consistent, the welding performance of steel is directly influenced by the increase of the content of C, and the welding performance of the steel is reduced and the toughness and the plasticity of the steel are reduced along with the increase of the content of Si; and when the Mn content is higher, the tempering brittleness phenomenon and the strip structure are more obvious, and the overheating sensitivity (coarse grains) and the low-temperature impact toughness of the steel are increased, so that the performance of the steel is ensured by reducing the Mn content in the steel and replacing V with Nb under the original design composition. On one hand, the manganese element is reduced by 0.25 percent, the ferrocolumbium is lower than the market price of vanadium-nitrogen alloy, and the alloy cost per ton of steel is reduced by 20 yuan/ton (2019).
By optimizing the components, V is replaced by Nb, Mn is properly reduced, the production cost of the product can be reduced, the economic benefit of a company is improved, various performances meet the standard requirements, degraded products with unqualified performances are not generated after optimization, and the market competitiveness of the product is improved.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. A process method for producing Nb-containing low-cost small and medium-sized hot-rolled H-shaped steel is characterized by comprising the following steps:
1) composition control range
C% is less than or equal to 0.20%, Si% is less than or equal to 0.50%, and Mn%: 1.20-1.30 percent, P percent is less than or equal to 0.025 percent, S percent is less than or equal to 0.025 percent, Nb percent is less than or equal to 0.020 percent, gases in steel do not need to be treated, and the balance of Fe and inevitable impurities;
2) carbon equivalent
Carbon equivalent CEV is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15, CEV is less than or equal to 0.45;
3) process route
The steel-making process comprises the following steps: blast furnace molten iron-molten iron pretreatment-converter top and bottom combined blowing smelting-LF external refining-beam blank continuous casting
The steel rolling process comprises the following steps: feeding, a step heating furnace, high-pressure water once dephosphorization, BD, CCS universal rolling, hot saw sampling, step cooling bed cooling, straightening, appearance and surface quality inspection, saw cutting, packaging, warehousing and outward sending;
wherein:
the smelting conditions are as follows: the raw materials and alloy materials are required to meet the requirements of standard specification, the molten iron is pretreated, the molten iron is desulfurized, and the requirement P is less than or equal to 0.120 percent;
and (3) converter end point control: c is more than or equal to 0.06 percent, P is less than 0.020 percent, and the tapping temperature is more than or equal to 1640 ℃; deoxidizing and alloying silicon, manganese and ferromanganese, finally deoxidizing aluminum, tapping and pushing off slag;
the refining is as follows: refining white slag, wherein Ar blowing is carried out in the whole process according to a refining rule, and the soft blowing time is more than 8 minutes; desulfurizing, fine adjusting and heating up according to the components and temperature of the molten steel in the converter
The continuous casting comprises the following steps: liquidus temperature TL 1511 ℃, superheat degree of molten steel: delta T is less than or equal to 35 ℃, and the constant pulling speed operation is adopted;
the hot rolling comprises the following steps: the steel mill sends the steel billets to a steel mill after ensuring that the surface quality and the internal quality of the steel billets do not exist; in the steel rolling mill, visual inspection is carried out again before the casting blank is put into the heating furnace, and the steel blank with scabs, cracks and tilted skin is picked out; the rolling start temperature is 1150 +/-50 ℃, after the BD is cogging, the CCS frame is used for rolling, and the front temperature of the CCS finishing mill is 880-930 ℃;
and (4) carrying out high-pressure water descaling.
2. The process for producing Nb-containing low-cost small and medium-sized hot-rolled H-shaped steel according to claim 1, wherein the steel comprises the following chemical components in percentage by weight: 0.19% of C, 0.30% of Si, 1.24% of Mn, 0.015% of P, 0.009% of S, 0.017% of Nb and the balance of Fe and inevitable impurities.
3. The process for producing Nb-containing, low-cost, small-and medium-sized hot-rolled H-section steel according to claim 1, wherein Δ T is not more than 30 ℃ during continuous casting.
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| CN113275530A (en) * | 2021-04-23 | 2021-08-20 | 包头钢铁（集团）有限责任公司 | Production method for reducing warping, rooting and scabbing of high-carbon hard wire rod |
| CN114058948A (en) * | 2021-10-18 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Large-size Z-direction hot-rolled H-shaped steel and production method thereof |
| CN114959461A (en) * | 2022-05-07 | 2022-08-30 | 柳州钢铁股份有限公司 | Micro niobium alloying Q355B low alloy high strength structural steel plate and manufacturing method thereof |
| CN115094308A (en) * | 2022-06-02 | 2022-09-23 | 包头钢铁（集团）有限责任公司 | Micro-alloy-element-free low-cost small-specification Q355B hot-rolled H-shaped steel and production method thereof |
| WO2023000479A1 (en) * | 2021-07-20 | 2023-01-26 | 山东钢铁股份有限公司 | Hot-rolled, low-temperature-resistant, h-shaped steel with grade of yield strength of 420 mpa, and preparation method therefor |
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| WO2023000479A1 (en) * | 2021-07-20 | 2023-01-26 | 山东钢铁股份有限公司 | Hot-rolled, low-temperature-resistant, h-shaped steel with grade of yield strength of 420 mpa, and preparation method therefor |
| CN114058948A (en) * | 2021-10-18 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Large-size Z-direction hot-rolled H-shaped steel and production method thereof |
| CN114959461A (en) * | 2022-05-07 | 2022-08-30 | 柳州钢铁股份有限公司 | Micro niobium alloying Q355B low alloy high strength structural steel plate and manufacturing method thereof |
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