CN114395723A - Chromium-free SWRH82B high-carbon steel wire rod and production method thereof - Google Patents
Chromium-free SWRH82B high-carbon steel wire rod and production method thereof Download PDFInfo
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- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 50
- 239000011651 chromium Substances 0.000 claims abstract description 46
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 25
- 238000007670 refining Methods 0.000 claims abstract description 24
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 20
- 238000009749 continuous casting Methods 0.000 claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 238000007664 blowing Methods 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 229910000734 martensite Inorganic materials 0.000 abstract description 18
- 238000005204 segregation Methods 0.000 abstract description 6
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 abstract description 4
- 238000000265 homogenisation Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 16
- 230000009466 transformation Effects 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
-
- 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
- C21D2211/008—Martensite
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a chromium-free SWRH82B high-carbon steel wire rod and a production method thereof, wherein the wire rod comprises the following components: c: (0.80-0.84) wt%, Si: (0.15-0.30) wt%, Mn: (0.70-0.80) wt%, P: less than or equal to 0.015wt%, S: less than or equal to 0.010wt%, Cr: less than or equal to 0.10wt%, Al: less than or equal to 0.005 wt%; the method comprises the following steps: (1) smelting the raw materials by adopting a top-bottom combined blown converter, wherein chromium is not added during smelting; (2) refining by using an LF refining furnace after smelting, wherein chromium is not added during refining; (3) refining and then carrying out (150 mm multiplied by 150-; (4) heating the steel billet after continuous casting; (5) descaling the steel billet by using high-pressure water after heating; (6) carrying out high-speed wire rod rolling after descaling; (7) and after rolling, stelmor air cooling line control cooling is adopted. According to the invention, the ferrochrome is not added in the converter and the refining furnace, the steel billet is uniformly heated, the chemical composition homogenization is promoted, the cooling speed before the air cooling line phase change is increased to more than 10 ℃/s from 7.5 ℃/s, the sorbite proportion is up to 90% or more, and the strength and the surface shrinkage of the wire rod can meet the quality requirements while the segregation of steel billet elements is controlled and the martensite content and the martensite level are reduced.
Description
Technical Field
The invention belongs to the field of steel production and manufacturing, and particularly relates to a high-carbon steel wire rod without chromium added SWRH82B and a production method thereof.
Background
The SWRH82B high-carbon steel wire rod is generally used in the production field of high-strength metal products such as prestressed steel wires, steel strands and the like, and is mainly used for manufacturing prestressed steel strands through drawing and stranding, the prestressed steel strands are widely applied to the fields of bridges, buildings, water conservancy, energy sources, geotechnical engineering and the like, and the prestressed steel strands need to have the characteristics of high strength, low relaxation, high toughness and the like.
However, the drawing brittle failure problem of the phi 12.5 specification SWRH82B high-carbon steel wire rod is easy to occur in production, the main reason is that the central serious Mn and Cr segregation aggregation causes the martensite abnormal structure of the product, and further causes the wire breakage problem in the paying-off or drawing stage of the product, and the quality stability and the production efficiency of the product are seriously influenced, wherein the higher the critical martensite generation cooling rate is, the less martensite is generated during cooling. How to reduce the drawing brittle failure of the SWRH82B high-carbon steel wire rod is an urgent problem to be solved in production.
Disclosure of Invention
The invention provides a chromium-free SWRH82B high-carbon steel wire rod and a production method thereof, wherein chromium content in a steel billet is strictly controlled by not adding high-carbon ferrochrome in a converter and a refining furnace, the steel billet is uniformly heated, chemical composition homogenization is promoted, a stelmor air cooling line adopts a high-air-volume fan to control cooling phase change, the cooling speed of the steel wire rod is increased to more than 10 ℃/s from 7.5 ℃/s before the air cooling line phase change, the interlayer spacing of pearlite sheets is refined, the sorbite proportion is 90% or more, meanwhile, because chromium is not added in steel, the martensite critical generation cooling speed is increased to more than 10 ℃/s from the original 6 ℃/s, the steel billet chromium segregation is improved, the martensite content and the martensite level are reduced, and meanwhile, the strength and the dough surface shrinkage of the high-carbon steel wire rod are ensured to meet the quality requirement.
In order to solve the technical problems, the invention adopts the following technical scheme:
an uncolored SWRH82B high carbon steel wire rod, the SWRH82B high carbon steel wire rod comprises the following components: c: (0.80-0.84) wt%, Si: (0.15-0.30) wt%, Mn: (0.70-0.80) wt%, P: less than or equal to 0.015wt%, S: less than or equal to 0.010wt%, Cr: less than or equal to 0.10wt%, Al: less than or equal to 0.005wt percent.
Further, the composition of the SWRH82B high carbon steel wire rod comprises: c: 0.805wt%, Si: 0.247wt%, Mn: 0.772wt%, P: 0.012wt%, S: 0.008wt%, Cr: 0.059wt%, Al: less than or equal to 0.0022wt percent; or C: 0.814wt%, Si: 0.231wt%, Mn: 0.746wt%, P: 0.011wt%, S: 0.007wt%, Cr: 0.034wt%, Al: less than or equal to 0.0028wt percent; or C: 0.821wt%, Si: 0.239wt%, Mn: 0.754wt%, P: 0.012wt%, S: 0.008wt%, Cr: 0.039wt%, Al: less than or equal to 0.0020wt percent; or C: 0.829wt%, Si: 0.229wt%, Mn: 0.753wt%, P: 0.009wt%, S: 0.010wt%, Cr: 0.039wt%, Al: less than or equal to 0.0026wt percent; or C: 0.834wt%, Si: 0.232wt%, Mn: 0.745wt%, P: 0.013wt%, S: 0.006wt%, Cr: 0.073wt%, Al: less than or equal to 0.0023wt percent.
A production method of a chrome-free SWRH82B high-carbon steel wire rod comprises the following steps:
(1) smelting the raw materials by adopting a top-bottom combined blown converter, and adding high-carbon ferromanganese during smelting without adding high-carbon ferrochrome;
(2) refining by using an LF refining furnace after smelting, wherein high carbon ferrochrome is not added during refining;
(3) after refining, a continuous casting machine is adopted for continuous casting of square billets (150- & lt180- & gt) mm;
(4) heating the steel billet after continuous casting, wherein the temperature of a soaking section is controlled to be (1100-1120) DEG C during heating, and the heating time is controlled to be (80-300) min;
(5) descaling the steel billet by using high-pressure water after heating;
(6) high-pressure water is adopted for descaling and then high-speed wire rolling is carried out by adopting a rolling machine;
(7) after rolling the high-speed wire rod, controlling cooling by adopting a stelmor air cooling line, wherein the stelmor air cooling line control cooling is realized by adopting a large-air-volume fan to control cooling phase change;
(8) performing coil collection after stelmor air-cooled wire control cooling;
(9) inspecting after the coil collection;
(10) warehousing after inspection;
(11) and delivering for transportation after warehousing.
Further, in step (1): and controlling the oxygen property by adopting a high-tension complementary blowing method in a 150-ton top-bottom combined blowing converter, and controlling the content of an element C: (0.10-0.40) wt%, P: not more than 0.010wt%, the end point temperature of the converter is controlled at 1580-; alloying after the converter, and controlling the contents of all elements as follows: c: (0.72-0.77) wt%, Si: (0.15-0.21) wt%, Mn: (0.63-0.73 wt%), Cr is less than or equal to 0.08wt%, V is less than or equal to 0.006 wt%.
Further, in the step (2): the alkalinity of refined final slag is controlled to be 2.0-3.0, the white slag holding time is controlled to be (20-50) min, the argon soft blowing flow is controlled to be (14-30) NL/min, and the soft blowing time is controlled to be (15-40) min.
Further, in step (3): the amount of the secondary cooling water in the continuous casting is 0.8L/kg, the argon pressure of the long nozzle of the continuous casting ladle is controlled to be (90-130) mbar, the height of the tundish is more than or equal to 400mm, the continuous casting pulling speed is controlled to be (1.5-1.8) m/min, the current intensity of electromagnetic stirring of the crystallizer is controlled to be (350-350) A, the current frequency is 3Hz, the current intensity of electromagnetic stirring at the solidification tail end is controlled to be (300-350) A, and the current frequency is 6 Hz.
Further, in step (5): the water pressure during high-pressure water descaling is 19 MPa.
Further, in step (6): the initial rolling temperature during rolling is controlled at 930-.
Further, in step (7): the air volume of the first seven fans during stelmor air-cooled line control cold planting is 230000 m/h, the air volume of the last seven fans during stelmor air-cooled line control cold planting is 148000 m/h, and the heat preservation cover is fully opened.
Further, the specification of the SWRH82B high carbon steel wire rod is phi 12.5 mm.
Compared with the prior art, the invention has the beneficial effects that:
the invention does not add high carbon ferrochrome in a converter and a refining furnace to strictly control the chromium content in the steel billet, ensures low chromium in the steel billet and uniformly heats the steel billet so as to promote the homogenization of the chemical components of the steel billet, and the martensite of the SWRH82B high carbon steel wire rod is mainly the segregation of manganese and chromium elements, so that the cooling speed of the core part and the surface of the steel billet is not uniform when the steel billet is cooled by a large air cooling line, the segregation of the chromium elements is improved, and the front section of the stelmor air cooling line is strongly cooled by a large air volume so as to avoid the Fe net-shaped carbide during stelmor air cooling line control cooling3C is precipitated, the cooling speed of the steel wire rod is increased from 7.5 ℃/s to more than 10 ℃/s before the phase transformation of the air cooling line, the lamellar spacing of pearlite is thinned, the strength of the steel is improved, the sorbite proportion reaches 90% or more, meanwhile, because chromium is not added into the steel, the critical martensite generation cooling speed of the rear section is increased from the original 6 ℃/s to more than 10 ℃/s, and the strength and the surface shrinkage of the high-carbon steel wire rod can meet the quality requirements while the chromium segregation of the steel billet is improved and the martensite content and the martensite grade are reduced. Through inspection, the obtained SWRH82B high-carbon steel wire rod not only ensures low martensite grade, but also ensures good mechanical property and drawing property, and the wire breaking rate is low after drawing by a user, so that the applicability of the product is improved, and the cost is reduced;
in the invention, stelmor air cooling line control cooling is realized by adopting a large-air-volume fan to control cooling phase change, and the heat-insulating cover is fully opened, so that a pearlite structure with finer lamellar spacing is obtained, the strength of steel is improved, and the reticular carbide Fe is avoided3C is precipitated whileThe martensite grade is reduced, and the wire breakage in drawing by a user is reduced.
Detailed Description
An uncolored SWRH82B high carbon steel wire rod, the SWRH82B high carbon steel wire rod comprises the following components: c: (0.80-0.84) wt%, Si: (0.15-0.30) wt%, Mn: (0.70-0.80) wt%, P: less than or equal to 0.015wt%, S: less than or equal to 0.010wt%, Cr: less than or equal to 0.10wt%, Al: less than or equal to 0.005wt percent.
A production method of a chrome-free SWRH82B high-carbon steel wire rod comprises the following steps:
(1) smelting the raw materials by adopting a top-bottom combined blown converter, and adding high-carbon ferromanganese during smelting without adding high-carbon ferrochrome;
(2) refining by using an LF refining furnace after smelting, wherein high carbon ferrochrome is not added during refining;
(3) after refining, a continuous casting machine is adopted for continuous casting of square billets (150- & lt180- & gt) mm;
(4) heating the steel billet after continuous casting, wherein the temperature of a soaking section is controlled to be (1100-1120) DEG C during heating, and the heating time is controlled to be (80-300) min;
(5) descaling the steel billet by using high-pressure water after heating;
(6) high-pressure water is adopted for descaling and then high-speed wire rolling is carried out by adopting a rolling machine;
(7) after rolling the high-speed wire rod, controlling cooling by adopting a stelmor air cooling line, wherein the stelmor air cooling line control cooling is realized by adopting a large-air-volume fan to control cooling phase change;
(8) performing coil collection after stelmor air-cooled wire control cooling;
(9) inspecting after the coil collection;
(10) warehousing after inspection;
(11) and delivering for transportation after warehousing.
According to the invention, stelmor air-cooled wire controlled cooling realizes that the cooling speed of the steel wire rod is increased from 7.5 ℃/s to more than 10 ℃/s before the phase change of the air-cooled wire.
Example 1
An uncolored SWRH82B high carbon steel wire rod, the SWRH82B high carbon steel wire rod comprises the following components: c: 0.805wt%, Si: 0.247wt%, Mn: 0.772wt%, P: 0.012wt%, S: 0.008wt%, Cr: 0.059wt%, Al: less than or equal to 0.0022wt percent.
A production method of a chrome-free SWRH82B high-carbon steel wire rod comprises the following steps:
(1) smelting the raw materials by adopting a 150-ton top-bottom combined blowing converter, controlling the oxygen property in the 150-ton top-bottom combined blowing converter by adopting a high-tension complementary blowing method, and controlling the element C: (0.10-0.40) wt%, P: not more than 0.010wt%, controlling the end point temperature of the converter at (1580-; alloying after the converter, and controlling the contents of all elements as follows: c: (0.72-0.77) wt%, Si: (0.15-0.21) wt%, Mn: (0.63-0.73 wt%), Cr is less than or equal to 0.08wt%, V is less than or equal to 0.006 wt%;
(2) refining by using an LF refining furnace after smelting, wherein the alkalinity of refined final slag is controlled to be 2.0-3.0, the white slag holding time is controlled to be (20-50) min, the argon soft blowing flow is controlled to be (14-30) NL/min, the soft blowing time is controlled to be (15-40) min, and high-carbon ferrochrome is not added in the refining process;
(3) after refining, a continuous casting machine is adopted to carry out (150-;
(4) heating the steel billet after continuous casting, wherein the temperature of a soaking section is controlled to be (1052-;
(5) heating the steel billet and then descaling by adopting high-pressure water, wherein the water pressure during descaling by the high-pressure water is 19 MPa;
(6) high-pressure water is adopted for high-speed wire rod rolling after descaling, the rolling temperature is controlled to be (930-;
(7) after rolling the high-speed wire rod, stelmor air cooling line control cooling is adopted, and stelmor air cooling line control cooling is realized by adopting a large-air-volume fan to control cooling phase change, so that the Gauss transformation rate is realized, the air volume of the front seven fans is 230000m for cultivating each hour, the air volume of the rear seven fans is 148000m for cultivating each hour, the 1# -14# fans are opened by 100%, and the heat-insulating cover is fully opened. (8) Performing coil collection after stelmor air-cooled wire control cooling;
(9) inspecting after the coil collection;
(10) warehousing after inspection;
(11) and delivering for transportation after warehousing.
Wherein the specification of the SWRH82B high carbon steel wire rod is phi 12.5 mm.
Example 2
An uncolored SWRH82B high carbon steel wire rod, the SWRH82B high carbon steel wire rod comprises the following components: c: 0.814wt%, Si: 0.231wt%, Mn: 0.746wt%, P: 0.011wt%, S: 0.007wt%, Cr: 0.034wt%, Al: less than or equal to 0.0028wt percent.
The production method of the high carbon steel wire rod without adding chromium SWRH82B is the same as that of example 1.
Example 3
An uncolored SWRH82B high carbon steel wire rod, the SWRH82B high carbon steel wire rod comprises the following components: c: 0.821wt%, Si: 0.239wt%, Mn: 0.754wt%, P: 0.012wt%, S: 0.008wt%, Cr: 0.039wt%, Al: less than or equal to 0.0020wt percent.
The production method of the high carbon steel wire rod without adding chromium SWRH82B is the same as that of example 1.
Example 4
An uncolored SWRH82B high carbon steel wire rod, the SWRH82B high carbon steel wire rod comprises the following components: c: 0.829wt%, Si: 0.229wt%, Mn: 0.753wt%, P: 0.009wt%, S: 0.010wt%, Cr: 0.039wt%, Al: less than or equal to 0.0026wt percent.
The production method of the high carbon steel wire rod without adding chromium SWRH82B is the same as that of example 1.
Example 5
An uncolored SWRH82B high carbon steel wire rod, the SWRH82B high carbon steel wire rod comprises the following components: c: 0.834wt%, Si: 0.232wt%, Mn: 0.745wt%, P: 0.013wt%, S: 0.006wt%, Cr: 0.073wt%, Al: less than or equal to 0.0023wt percent.
The production method of the high carbon steel wire rod without adding chromium SWRH82B is the same as that of example 1.
The test results of the above five examples were analyzed as follows:
the chromium content of each section of the specific steel making in examples 1-5 is shown in Table 1.
TABLE 1 chromium content (wt%) of each steel-making stage
| Examples | Chromium content before converter exit | Chromium content of refining furnace | Chromium content in continuous casting |
| Example 1 | 0.054 | 0.061 | 0.059 |
| Example 2 | 0.035 | 0.036 | 0.034 |
| Example 3 | 0.041 | 0.039 | 0.039 |
| Example 4 | 0.035 | 0.039 | 0.039 |
| Example 5 | 0.072 | 0.075 | 0.073 |
The cooling rates of the air-cooled lines for examples 1-5 are shown in Table 2.
TABLE 2 Cooling Rate (DEG C/s) of air-cooled line blower
In table 2, the blower fan # 4-9 realizes isothermal transformation at 615 ℃ or so to obtain a high sorbite rate, the blower fan at the later stage controls the martensitic transformation, and the martensite grades of the embodiments 1-5 are all 0 grades in actual detection, and no martensite is generated.
The mechanical properties and user performance of the finished wire rods of examples 1-5 are shown in Table 3.
TABLE 3 mechanical Properties of the wire rod and user applications
As can be seen from the test data in Table 3, the wire rod obtained by the production method not only ensures low martensite grade, but also ensures good mechanical property and drawing property, and the wire breaking rate is low after drawing by a user, so that the applicability of the product is improved, and the cost is reduced.
Claims (10)
1. An uncolored SWRH82B high carbon steel wire rod, characterized in that the SWRH82B high carbon steel wire rod comprises the following components: c: (0.80-0.84) wt%, Si: (0.15-0.30) wt%, Mn: (0.70-0.80) wt%, P: less than or equal to 0.015wt%, S: less than or equal to 0.010wt%, Cr: less than or equal to 0.10wt%, Al: less than or equal to 0.005wt% C: 0.80-0.84wt%, Si: 0.15 to 0.30wt%, Mn: 0.70-0.80wt%, P: less than or equal to 0.015wt%, S: less than or equal to 0.010wt%, Cr: less than or equal to 0.10wt%, Al: less than or equal to 0.005wt percent.
2. The chrome-free SWRH82B high carbon steel wire rod of claim 1 wherein the composition of the SWRH82B high carbon steel wire rod comprises: c: 0.805wt%, Si: 0.247wt%, Mn: 0.772wt%, P: 0.012wt%, S: 0.008wt%, Cr: 0.059wt%, Al: less than or equal to 0.0022wt percent; or C: 0.814wt%, Si: 0.231wt%, Mn: 0.746wt%, P: 0.011wt%, S: 0.007wt%, Cr: 0.034wt%, Al: less than or equal to 0.0028wt percent; or C: 0.821wt%, Si: 0.239wt%, Mn: 0.754wt%, P: 0.012wt%, S: 0.008wt%, Cr: 0.039wt%, Al: less than or equal to 0.0020wt percent; or C: 0.829wt%, Si: 0.229wt%, Mn: 0.753wt%, P: 0.009wt%, S: 0.010wt%, Cr: 0.039wt%, Al: less than or equal to 0.0026wt percent; or C: 0.834wt%, Si: 0.232wt%, Mn: 0.745wt%, P: 0.013wt%, S: 0.006wt%, Cr: 0.073wt%, Al: less than or equal to 0.0023wt percent.
3. A method for producing a high carbon steel wire rod of SWRH82B without chromium addition according to any of claims 1 or 2, characterized by comprising the steps of:
(1) smelting the raw materials by adopting a top-bottom combined blown converter, and adding high-carbon ferromanganese during smelting without adding high-carbon ferrochrome;
(2) refining by using an LF refining furnace after smelting, wherein high carbon ferrochrome is not added during refining;
(3) after refining, a continuous casting machine is adopted for continuous casting of square billets (150- & lt180- & gt) with the size of 150mm multiplied by 150 mm;
(4) heating the steel billet after continuous casting, wherein the temperature of a soaking section is controlled to be (10501100-;
(5) descaling the steel billet by using high-pressure water after heating;
(6) high-pressure water is adopted for descaling and then high-speed wire rolling is carried out by adopting a rolling machine;
(7) after rolling the high-speed wire rod, controlling cooling by adopting a stelmor air cooling line, wherein the stelmor air cooling line control cooling is realized by adopting a large-air-volume fan to control cooling phase change;
(8) performing coil collection after stelmor air-cooled wire control cooling;
(9) inspecting after the coil collection;
(10) warehousing after inspection;
(11) and delivering for transportation after warehousing.
4. A method for producing a chrome-free SWRH82B high carbon steel wire rod according to claim 3, wherein in the step (1): and controlling the oxygen property by adopting a high-tension complementary blowing method in a 150-ton top-bottom combined blowing converter, and controlling the content of an element C: (0.10-0.40) wt%, P: not more than 0.010wt%, the end point temperature of the converter is controlled at (1580-; alloying after the converter, and controlling the contents of all elements as follows: c: (0.72-0.77) wt%, Si: (0.15-0.21) wt%, Mn: (0.63-0.73 wt%), Cr is less than or equal to 0.08wt%, V is less than or equal to 0.006 wt%.
5. A method for producing a chrome-free SWRH82B high carbon steel wire rod according to claim 3, wherein in the step (2): the alkalinity of refined final slag is controlled to be 2.0-3.0, the white slag holding time is controlled to be (20-50) min, the argon soft blowing flow is controlled to be (14-30) NL/min, and the soft blowing time is controlled to be (15-40) min.
6. A method for producing a chrome-free SWRH82B high carbon steel wire rod according to claim 3, wherein in the step (3): the secondary cooling water amount of the continuous casting is 0.8L/kg, the argon pressure of the long nozzle of the continuous casting ladle is controlled to be (90-130) mbar, the height of the tundish is more than or equal to 400mm, the continuous casting pulling speed is controlled to be 1.5-1.8m/min, the current intensity of electromagnetic stirring of the crystallizer is controlled to be (350- & gt 400) A, the current frequency is 3Hz, the current intensity of electromagnetic stirring at the solidification tail end is controlled to be (300- & gt 350) A, and the current frequency is 6 Hz.
7. A method for producing a chrome-free SWRH82B high carbon steel wire rod according to claim 3, wherein in the step (5): the water pressure during high-pressure water descaling is 19 MPa.
8. A method for producing a chrome-free SWRH82B high carbon steel wire rod according to claim 3, wherein in the step (6): the initial rolling temperature during rolling is controlled at (930-.
9. A method for producing a chrome-free SWRH82B high carbon steel wire rod according to claim 3, wherein in the step (7): the air volume of the first seven fans during stelmor air-cooled line control cold planting is 230000 m/h, the air volume of the last seven fans during stelmor air-cooled line control cold planting is 148000 m/h, and the heat preservation cover is fully opened.
10. A method for producing a chrome-free SWRH82B high carbon steel wire rod according to claim 3, wherein: the specification of the SWRH82B high carbon steel wire rod is phi 12.5 mm.
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