CN111687211B - Rolling method of niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness - Google Patents
Rolling method of niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 54
- 239000010959 steel Substances 0.000 title claims abstract description 54
- 238000005096 rolling process Methods 0.000 title claims abstract description 32
- 239000010955 niobium Substances 0.000 title claims abstract description 26
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 23
- 229910052758 niobium Inorganic materials 0.000 title claims abstract description 20
- 239000011574 phosphorus Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000005266 casting Methods 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229910000870 Weathering steel Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a preparation method of niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness, which comprises the steps of a step-by-step heating furnace heating process, a BD cogging process → a CCS universal rolling unit (U)R1+ER+UR2+UR3+ EF + UF) rolling process → control of the cooling process of the stepping cooling bed, the niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness is successfully produced, and the surface quality, the appearance size and various properties of the H-shaped steel meet the requirements of users.
Description
Technical Field
The invention relates to the technical field of rolling, in particular to a method for rolling niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness.
Background
The rapidly developing modern industry is increasingly polluted by the environment, and more people pay attention to the corrosion loss of steel in the using process. The high-strength phosphorus-containing weathering steel is structural steel capable of prolonging the service life of components, and has special significance in the aspects of saving resources, protecting the environment and the like as well as good service properties such as weather resistance, mechanical property and weldability, so that the high-strength phosphorus-containing weathering steel is generally emphasized by countries all over the world and is widely applied. The method is mainly applied to vehicles, containers, buildings, towers or other structural members and the like in China. The weather-resistant alloy elements Ni and Cr in China are short in resources, so that the development of high weather-resistant steel based on Cu and P elements is a necessary trend in China. Because the P element is added into the steel and has the characteristic of cold brittleness, the P-containing weathering steel must be effectively controlled in the rolling process to refine grains and improve the low-temperature toughness of the steel in order to ensure the good low-temperature toughness of the steel.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a rolling method of hot-rolled H-shaped steel with high niobium content, high phosphorus content, stable low-temperature impact toughness, high strength and weather resistance.
In order to solve the technical problems, the invention adopts the following technical scheme:
a rolling method of niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness comprises the following rolling processes: heating in a step heating furnace → dephosphorization under high pressure → BD cogging → CCS universal rolling mill set (U)R1+ER+UR2+UR3+ EF + UF) → step cooling → straightening → checking of the shape and surface quality → baling;
wherein:
when the casting blank is heated to the melting point (1083 ℃) of copper, quick firing is adopted, so that the residence time of the casting blank at the melting point (1083 ℃) is shortened as much as possible, and meanwhile, the reducing atmosphere in the furnace is ensured; the temperature of the preheating section is controlled to be less than or equal to 900 ℃, the temperature of the first heating section is controlled to be less than or equal to 1100 ℃, the temperature of the second heating section is controlled to be 1150-1260 ℃, the temperature of the soaking section is controlled to be 1200-1250 ℃, and the total heating time of the casting blank is controlled to be 3-4h;
the BD cogging mill is designed to roll for 9 times, the cogging zone is not controlled to roll, the total reduction rate is more than or equal to 45 percent, and the cogging temperature is controlled to be 1150-1200 ℃;
the CCS universal rolling mill is designed to roll for 7 passes and is controlled to roll, so that sufficiently uniform deformation bands are generated in austenite crystals, ferrite cores in the crystals and the deformation bands, crystal grains are refined, and the final rolling temperature is controlled to be 850-900 ℃;
controlling the temperature of the upper cooling bed of the finished product H-shaped steel to be more than or equal to 800 ℃, and carrying out close packing cooling.
Furthermore, before the casting blank enters the BD1, high-pressure water dephosphorization is required, so that the surface defects of the finished H-shaped steel caused by pressing the iron oxide blank in the casting blank are prevented.
Further, the size of the finished H-shaped steel is H630mm multiplied by 200mm multiplied by 13mm multiplied by 20mm.
Further, the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.07-0.12 percent of C, 0.40-0.60 percent of Si, 0.20-0.50 percent of Mn, 0.06-0.12 percent of P, less than or equal to 0.015 percent of S, 0.30-0.50 percent of Cr, 0.25-0.40 percent of Cu, 0.20-0.40 percent of Ni, 0.02-0.06 percent of Nb, and the balance of Fe and impurities, wherein the mass fraction is 100 percent.
Furthermore, the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.08 percent of C, 0.40 percent of Si, 0.45 percent of Mn, 0.071 percent of P, 0.005 percent of S, 0.40 percent of Cr, 0.30 percent of Cu, 0.28 percent of Ni, 0.031 percent of Nb and the balance of Fe and impurities, wherein the mass fraction is 100 percent in total.
Furthermore, the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.09% of C, 0.48% of Si, 0.41% of Mn, 0.080% of P, 0.003% of S, 0.43% of Cr, 0.33% of Cu, 0.35% of Ni, 0.025% of Nb and the balance of Fe and impurities, wherein the mass fraction accounts for 100%.
Furthermore, the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.10% of C, 0.51% of Si, 0.48% of Mn, 0.080% of P, 0.007% of S, 0.41% of Cr, 0.33% of Cu, 0.32% of Ni, 0.038% of Nb and the balance of Fe and impurities, wherein the mass fraction accounts for 100%.
Furthermore, the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.11% of C, 0.44% of Si, 0.42% of Mn, 0.0650% of P, 0.009% of S, 0.45% of Cr, 0.36% of Cu, 0.34% of Ni, 0.043% of Nb and the balance of Fe and impurities, wherein the mass fraction accounts for 100%.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the invention, before the casting blank is fed into BD1, high-pressure water dephosphorization is carried out, so that the generation of surface defects of finished H-shaped steel due to the pressing of the iron oxide blank is prevented.
Meanwhile, the BD cogging mill is designed to roll for 9 times, the cogging zone is not controlled to roll, the total reduction rate is more than or equal to 45 percent, the cogging temperature is controlled to be 1150-1200 ℃, the CCS universal mill is designed to roll for 7 times, and controlled rolling is carried out, so that enough uniform deformation zones are generated in austenite crystals, ferrite is nucleated in the crystals and on the deformation zones, and grains are refined.
The cooling process controls the temperature of an upper cooling bed of the finished H-shaped steel, the temperature of the upper cooling bed is more than or equal to 800 ℃, and the close packing cooling (and heat preservation measures of a cooling bed area are needed during production in winter) is carried out to ensure that the structure of the finished H-shaped steel is uniform, so that the low-temperature impact toughness of the finished H-shaped steel is stable;
it has high strength, stable low-temperature impact toughness and good corrosion resistance.
Detailed Description
A rolling process of hot-rolled H-shaped steel containing niobium, high phosphorus, stable low-temperature impact toughness, high strength and weather resistance comprises the following steps: heating in a step heating furnace → dephosphorization under high pressure → BD cogging → CCS universal rolling mill set (U)R1+ER+UR2+UR3+ EF + UF → cooling by a step cooling bed → straightening → checking of the shape and surface quality → packaging.
Wherein:
when the casting blank is heated to the melting point (1083 ℃) of copper, quick firing is adopted, the residence time of the casting blank at 1083 ℃ is shortened as much as possible, and meanwhile, the reducing atmosphere in the furnace is ensured; the temperature of a preheating section is controlled to be less than or equal to 900 ℃, the temperature of a heating section is controlled to be less than or equal to 1100 ℃, the temperature of a heating section is controlled to be 1150 to 1260 ℃, the temperature of a soaking section is controlled to be 1200 to 1250 ℃, and the total heating time of a casting blank is controlled to be 3 to 4 hours;
after the weather-resistant steel billet is heated, the iron scale is hard and is not easy to remove, and high-pressure water dephosphorization is required before the casting blank enters the BD1, so that the surface defects of the finished product H-shaped steel caused by pressing the iron oxide billet into the steel billet are prevented.
The BD cogging mill is designed to roll for 9 times, the cogging zone is not controlled to roll, the total reduction rate is more than or equal to 45 percent, and the cogging temperature is controlled to be 1150-1200 ℃.
The CCS universal rolling mill is designed to roll for 7 times and is controlled to roll, so that a sufficiently uniform deformation zone is generated in austenite crystal, ferrite is nucleated in the crystal and on the deformation zone, crystal grains are refined, and the final rolling temperature is controlled to be 850-900 ℃.
Controlling the temperature of an upper cooling bed of the finished H-shaped steel to be more than or equal to 800 ℃, carrying out close-packed cooling, and during production in winter, making heat preservation measures in the cooling bed area to ensure the uniform structure of the finished H-shaped steel, so that the finished H-shaped steel has stable low-temperature impact toughness.
The finished H-shaped steel has the dimensions of H630mm multiplied by 200mm multiplied by 13mm multiplied by 20mm.
And (4) inspecting the surface quality and the overall dimension of the niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness.
Obvious surface defects of finished products are not found in the inspection process, the overall dimension of the finished H-shaped steel meets the standard requirements, the surface quality is good, various properties of the rolled H-shaped steel meet the standard requirements, and the stability of the low-temperature impact toughness is good.
Table 1 shows the chemical compositions of the steel grades of the examples, and tables 2, 3 and 4 further illustrate the present invention in connection with the examples.
Table 1 chemical composition (mass%/%)
| Examples | C | Si | Mn | P | S | Cu | Ni | Cr | Nb |
| Example 1 | 0.08 | 0.40 | 0.45 | 0.071 | 0.005 | 0.30 | 0.28 | 0.40 | 0.031 |
| Example 2 | 0.09 | 0.48 | 0.41 | 0.080 | 0.003 | 0.35 | 0.35 | 0.43 | 0.025 |
| Example 3 | 0.10 | 0.51 | 0.48 | 0.088 | 0.007 | 0.33 | 0.32 | 0.41 | 0.038 |
| Example 4 | 0.11 | 0.44 | 0.42 | 0.065 | 0.009 | 0.36 | 0.34 | 0.45 | 0.043 |
TABLE 2 control of the initial rolling temperature and the final rolling temperature for each example
| Examples | Initial Rolling temperature (. Degree.C.) | Finishing temperature (. Degree. C.) |
| Example 1 | 1161 | 883 |
| Example 2 | 1186 | 872 |
| Example 3 | 1175 | 854 |
| Example 4 | 1171 | 861 |
TABLE 3 Cooling bed temperature and Cooling Rate for the examples
| Examples | Temperature on Cooling bed (. Degree. C.) | Cooling Rate (. Degree. C/s) |
| Example 1 | 818 | 0.488 |
| Example 2 | 835 | 0.438 |
| Example 3 | 830 | 0.4153 |
| Example 4 | 825 | 0.4532 |
TABLE 4 mechanical Properties and grain sizes of rolled H-shaped steels in examples
TABLE 5 Corrosion resistance of the examples
As can be seen from the above examples, the H-shaped steel has high strength, stable low-temperature impact toughness and good corrosion resistance.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (7)
1. A rolling method of niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness is characterized by comprising the following rolling processes: heating by a stepping heating furnace → dephosphorization by high-pressure water → cogging for BD → universal rolling mill set for CCS → cooling by a stepping cooling bed;
wherein:
when the casting blank is heated to the melting point of copper, quick firing is adopted, so that the residence time of the casting blank at the melting point is shortened as much as possible, and the reducing atmosphere in a furnace is ensured; the temperature of the preheating section is controlled to be less than or equal to 900 ℃, the temperature of the first heating section is controlled to be less than or equal to 1100 ℃, the temperature of the second heating section is controlled to be 1150-1260 ℃, the temperature of the soaking section is controlled to be 1200-1250 ℃, and the total heating time of the casting blank is controlled to be 3-4h;
the BD cogging mill is designed to roll for 9 times, the cogging zone is not controlled to roll, the total reduction rate is more than or equal to 45 percent, and the cogging temperature is controlled to be 1150-1200 ℃;
the CCS universal rolling mill is designed to roll for 7 passes and is controlled to roll, so that sufficiently uniform deformation bands are generated in austenite crystals, ferrite cores in the crystals and the deformation bands, crystal grains are refined, and the final rolling temperature is controlled to be 850-900 ℃;
controlling the temperature of the finished product H-shaped steel on a cooling bed to be more than or equal to 800 ℃, and carrying out close packing cooling;
the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.07-0.12 percent of C, 0.40-0.60 percent of Si, 0.20-0.50 percent of Mn, 0.06-0.12 percent of P, less than or equal to 0.015 percent of S, 0.30-0.50 percent of Cr, 0.25-0.40 percent of Cu, 0.20-0.40 percent of Ni, 0.02-0.06 percent of Nb, and the balance of Fe and impurities, wherein the mass fraction is 100 percent.
2. The method for rolling the niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness according to claim 1, wherein before the casting blank is fed into the BD1, high-pressure water dephosphorization is required to prevent the generation of surface defects of the finished H-shaped steel due to the pressing of the iron oxide blank.
3. The method for rolling the niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness according to claim 1, wherein the finished H-shaped steel has dimensions H630mm x 200mm x 13mm x 20mm.
4. The method for rolling the niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness according to the claim 1, wherein the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.08 percent of C, 0.40 percent of Si, 0.45 percent of Mn0.45 percent, 0.071 percent of P, 0.005 percent of S, 0.40 percent of Cr, 0.30 percent of Cu, 0.28 percent of Ni, 0.031 percent of Nb, and the balance of Fe and impurities, wherein the mass fraction accounts for 100 percent.
5. The rolling method of the niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness according to the claim 1, wherein the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.09% of C, 0.48% of Si, 0.41% of Mn0.41%, 0.080% of P, 0.003% of S, 0.43% of Cr, 0.33% of Cu, 0.35% of Ni, 0.025% of Nb and the balance of Fe and impurities, wherein the mass fractions are 100%.
6. The rolling method of the niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness according to the claim 1, wherein the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.10% of C, 0.51% of Si, 0.48% of Mn0.48%, 0.080% of P, 0.007% of S, 0.41% of Cr, 0.33% of Cu, 0.32% of Ni, 0.038% of Nb, and the balance of Fe and impurities, wherein the mass fraction accounts for 100%.
7. The method for rolling the niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness according to the claim 1, wherein the chemical components of the H-shaped steel comprise the following components in percentage by mass: 0.11% of C, 0.44% of Si, 0.42% of Mn0.42%, 0.0650% of P, 0.009% of S, 0.45% of Cr, 0.36% of Cu, 0.34% of Ni, 0.043% of Nb and the balance of Fe and impurities, wherein the mass fraction accounts for 100%.
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