CN115710671A - Steel wire rod for steel wire rope and preparation method thereof - Google Patents
Steel wire rod for steel wire rope and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a steel wire rod for a steel wire rope, which comprises the following alloy components: 0.49 to 0.56% by weight of C,0.15 to 0.35% by weight of Si,0.60 to 0.90% by weight of Mn, not more than 0.020% by weight of P, not more than 0.020% by weight of S, not more than 0.20% by weight of Cr, not more than 0.20% by weight of Ni, not more than 0.20% by weight of Cu, and the balance of Fe and inevitable impurities. The tensile strength of the wire rod is 800-920 MPa, the elongation is more than or equal to 13%, the reduction of area is more than or equal to 39%, the nonmetallic inclusion A + C is less than or equal to 2.0, the B + D is less than or equal to 1.5, and the depth of a total decarburized layer is less than or equal to 1.5 Dm. The preparation process sequentially comprises the process steps of a 120t converter, external refining LF, continuous casting of small square billets, heating of a heating furnace, controlled rolling and controlled cooling rolling, heat preservation of channels and the like, and the purpose of saving cost can be achieved while the strength and toughness of the steel wire rod for the steel wire rope are ensured by optimally designing the components of the billets and optimizing the controlled rolling and controlled cooling process.
Description
Technical Field
The invention belongs to the field of metallurgical material preparation, and particularly relates to a steel wire rod for a steel wire rope and a preparation method thereof.
Background
The steel grade of the wire rod for the steel wire rope is generally medium-high carbon steel. The steel wire rope product is mainly used for smooth wire ropes, hoisting wire ropes, elevator wire ropes, galvanized wire ropes and the like. Is one of high-end and high-added value brand steel grades in high-speed wire rod products.
For example, chinese patent CN105671443B discloses a hot-rolled wire rod for 1960MPa level cable galvanized steel wires and a production method thereof, after the wire rod obtained by the method is subjected to drawing, galvanizing and stabilizing treatment, the tensile strength of the steel wire meets the requirement of being more than or equal to 1960MPa, the torsion index is more than or equal to 14 times, and the hot-rolled wire rod can be used for producing 1960MPa level bridge cable galvanized steel wires. However, as the content of the solid solution carbon increases, the plasticity, toughness and elasticity of the steel are reduced, and the cost is high. Medium carbon steels are therefore most widely used for their good overall mechanical properties in medium strength level applications.
At present, in order to further improve the comprehensive performance of products in the prior art, a large amount of noble metal elements such as Cr, ni, mo and the like are often added into medium carbon steel, so that the cost is increased, and the environmental pollution is caused. Therefore, how to design the hot-rolled wire rod and the preparation method thereof, which can meet the requirements of the strength and the toughness of steel for the steel wire rope and achieve the aims of environmental protection and cost saving, has great economic value and wide market prospect.
Disclosure of Invention
In order to achieve the aim, the invention provides a steel wire rod for a steel wire rope and a preparation method thereof, the method adopts the process steps of a 120t converter, external refining LF, continuous casting of small square billets, heating of a heating furnace, controlled rolling and controlled cooling rolling, a heat preservation channel and the like, and can achieve the aim of saving cost while ensuring the strength and toughness of the steel wire rod for the steel wire rope by optimally designing the components of a blank and optimizing the controlled rolling and controlled cooling process.
The specific invention content is as follows:
a steel wire rod for a steel wire rope, which comprises the following alloy components: 0.49-0.56% C, 0.15-0.35% Si, 0.60-0.90% Mn, ≦ 0.020% P, ≦ 0.020% S, ≦ 0.20% Cr, ≦ 0.20% Ni, ≦ 0.20% Cu, the balance Fe and unavoidable impurities.
Preferably, the tensile strength of the wire rod is 800-920 MPa, the elongation is more than or equal to 13%, the reduction of area is more than or equal to 39%, the nonmetallic inclusions A + C are less than or equal to 2.0, the B + D are less than or equal to 1.5, and the depth of the total decarburized layer is less than or equal to 1.5 Dm.
The invention also aims to provide a preparation method of the steel wire rod for the steel wire rope, which sequentially comprises the steps of converter smelting, steel ladle alloying, static argon blowing, LF furnace refining, square billet continuous casting, heating of a stepping heating furnace and rolling, wherein the converter smelting comprises the following steps: according to the mass percentage, 14-16 percent of scrap steel, 84-86 percent of molten iron and oxygen top-bottom combined blowing are carried out, the tapping temperature is 1595-1630 ℃, the tapping end point C is 0.40-0.55 percent, P is less than or equal to 0.015 percent, and slag is strictly forbidden.
Further, the steel ladle is alloyed as follows: adding lime, pre-deoxidizer and ferroalloy for deoxidation alloying when tapping is 1/4-1/3, and argon blowing time is more than or equal to 5min; the addition amount of each ton of steel alloy is as follows: 8.2-9.0 kg/t steel of manganese silicon, 0.8-1.06 kg/t steel of ferrosilicon and 1.5-2.4 kg/t steel of steel-making carburant.
Further, the static argon blowing step comprises the following steps: the static argon blowing time is more than or equal to 8min, the temperature before treatment is 1540-1560 ℃, the temperature after treatment is 1520-1540 ℃, the pure calcium cored wire is fed at 1-1.2 kg/t after the static argon blowing, and the wire feeding speed is 3m/s.
Further, the refining step of the LF furnace requires white slag operation, and the alkalinity of slag and the oxygen potential in the slag are controlled under the condition of ensuring the fluidity of the slag; LF refining time is 60-80 min, and total analysis temperature is 1545-1570 ℃; the adding amount of auxiliary materials per ton steel is as follows: 7.33 to 8Kg/t of active lime, 0.73 to 0.8Kg/t of fluorite, 0.4 to 0.6Kg/t of carbide slag and 0.50 to 0.60Kg/t of carbonized rice husk, and the molten steel is detected in real time, alloy is finely adjusted to ensure that the components of the molten steel meet the standard requirements, the soft blowing time is more than or equal to 12min, and the calcium wire is fed for 80 to 150m.
Further, the continuous casting is: electromagnetic stirring current of a crystallizer is 280A, frequency is 5Hz, the crystallizer rotates forwards and backwards, electromagnetic stirring current of the tail end is 300A, and frequency is 8Hz; the platform temperature is 1558 +/-5 ℃, the tundish temperature is 1520-1530 ℃, the superheat degree is kept at 25-35 ℃, and the pulling speed is 2.4-2.6 m/min; the whole process is casting-protected, and the crystallizer casting powder uses square billet medium carbon steel casting powder; the casting blank cutting adopts a mode of combining automation and manpower.
Further, the heating of the heating furnace is as follows: heating by a stepping heating furnace, wherein the temperature of a preheating section is 860-900 ℃ for 45-65 min, the temperature of a heating section is 1100-1140 ℃, the heating time is 45-65 min, the temperature of a soaking section is 1130-1170 ℃, the heating time is 30-50 min, and the total heating time is 2-3 h.
Further, the rolling step is as follows: rough rolling temperature: 1000 ℃ to 1040 ℃, finish rolling inlet temperature: 880-920 ℃, spinning temperature: 870 ℃ -910 ℃, air-cooled roller bed speed: the head roller way is 0.70-0.90 m/s, and the roller way speed increase is set to be 2-5%; the heat preservation channel is effectively utilized, and the effective release of the tissue stress and the internal stress is ensured.
The beneficial effects of the invention are as follows:
(1) The method ensures that the purity of the product steel is high, ensures the obdurability and the surface quality of the wire rod and completely meets the requirements of steel wire rope customers at home and abroad by reasonably selecting the process route and reasonably designing the process parameters.
(2) The method adopts the electromagnetic stirring of the continuous casting crystallizer and the electromagnetic stirring of the solidification tail end, improves the surface quality of the casting blank, and reduces internal cracks and central defects.
(3) The method reduces the addition of Cr element, the Cr content of the finished product is only about 0.0012%, and the comprehensive performance of the finished product can be still ensured while the cost is saved.
Drawings
Fig. 1 is a metallographic structure photograph of a steel wire rod for a steel wire rope according to example 1 of the present invention.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
The test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
One of the specific implementation modes is as follows:
a steel wire rod for a steel wire rope:
1. chemical composition design (mass percentage)
C: less than or equal to 0.01%, si: less than or equal to 0.01 percent, mn: less than or equal to 0.12 percent, P: less than or equal to 0.012%, S: less than or equal to 0.010 percent, less than or equal to 0.0080 percent of O, less than or equal to 0.0040 percent of N, and the balance of Fe and inevitable impurities.
The principle of the invention is as follows:
c: c is the main element for solid solution strengthening in steel, and the content of C is controlled to be 0.49-0.56%.
Si: si is a ferrite solid solution strengthening element and plays a role in deoxidation in the steelmaking process, when the Si content is too high, the solid solution strengthening effect is saturated, the stony desertification is generated in the steel structure and the decarburization degree is increased, the heating of the billet is easy to make austenite grow through crystal grains, the formed structure is also thicker, the plasticity and toughness are prone to be deteriorated, and therefore, the Si content is controlled to be 0.15-0.35%.
Mn: has the functions of solid solution strengthening and fine crystal strengthening. The Mn content is controlled to be 0.60 to 0.90 percent
P, S: P, S are hazardous elements whose levels are controlled to improve their purity, thus requiring them to be low levels. Wherein P is less than or equal to 0.020 percent, and S is less than or equal to 0.020 percent.
2. The preparation method comprises the following steps:
1. the process comprises the following steps: molten iron pretreatment (S removal and slag skimming) → 120t converter (top and bottom combined blowing) → steel ladle bottom argon blowing → LF furnace refining → 150 x 150mm square billet continuous casting (crystallizer electromagnetic stirring, protective casting and end electromagnetic stirring) → steel billet slow cooling → heating furnace heating → wire rod rolling → spinning → inspection → rolling collection → heat preservation channel slow cooling → sampling, inspection, judgment → packaging and delivery.
2. Key process
In order to ensure the quality of the casting blank, the surface quality of the casting blank is improved and internal cracks and central defects are reduced by controlling effective measures such as the superheat degree of molten steel, the blank drawing speed, the electromagnetic stirring of a continuous casting crystallizer, the electromagnetic stirring of a solidification tail end and the like.
Smelting in a converter: scrap steel accounts for about 15%, and molten iron accounts for about 85%; oxygen top-bottom combined blowing is carried out, the tapping temperature is 1595-1630 ℃, the tapping end point C is 0.40-0.55%, P is less than or equal to 0.015%, and slag discharging is strictly forbidden.
Alloying the steel ladle: lime, pre-deoxidizer and ferroalloy are added for deoxidation alloying when tapping is carried out for 1/4-1/3, and argon blowing time is more than or equal to 5min. Adding target amount of steel alloy per ton: 8.2-9.0 kg/t steel of manganese silicon, 0.8-1.06 kg/t steel of ferrosilicon and 1.5-2.4 kg/t steel of steel-making carburant.
Static argon blowing: the static argon blowing time is more than or equal to 8min, the temperature before treatment is 1540-1560 ℃, the temperature after treatment is 1520-1540 ℃, the pure calcium cored wire is fed at 1-1.2 kg/t after the static argon blowing, and the wire feeding speed is 3m/s.
Refining in an LF furnace: white slag operation is required, and the slag alkalinity and the oxygen potential in slag are controlled under the condition of ensuring the slag fluidity; detecting molten steel from time to time, and finely adjusting alloy to ensure that the components of the molten steel meet the standard requirements; LF refining time is 60-80 min, and total analysis temperature is 1545-1570 ℃. Adding amount of auxiliary materials per ton steel: 7.33 to 8Kg/t of active lime, 0.73 to 0.8Kg/t of fluorite, 0.4 to 0.6Kg/t of carbide slag and 0.50 to 0.60Kg/t of carbonized rice husk, and the molten steel is detected from time to time, alloy is finely adjusted to ensure that the components of the molten steel meet the standard requirements, the soft blowing time is more than or equal to 12min, and the calcium wire is fed for 80 to 150m.
Continuous casting: the electromagnetic stirring current of the crystallizer is 280A, the frequency is 5Hz, the crystallizer rotates forwards and backwards, the electromagnetic stirring current at the tail end is 300A, the frequency is 8Hz, and the operation is continuous. The platform temperature is 1558 +/-5 ℃, the tundish temperature is 1520-1530 ℃, the superheat degree is kept at 25-35 ℃, and the drawing speed is 2.4-2.6 m/min. The whole process is casting-protected, and the crystallizer casting powder uses square billet medium carbon steel casting powder; the casting blank cutting adopts a mode of combining automation and manpower.
A heating process: heating in a stepping heating furnace, wherein the preheating section is 880 +/-20 ℃, the heating section is 1120 +/-20 ℃, the soaking section is 1150 +/-20 ℃, and the heating time is 2-3 h.
The rolling process comprises the following steps:
rough rolling temperature: 1020 +/-20 ℃; finish rolling inlet temperature: 900 plus or minus 20 ℃; spinning temperature: 890 +/-20 ℃; air-cooled roller table speed: the head roller way is 0.70-0.90 m/s; the roller way speed increasing is set to be 2-5%.
A heat preservation channel: the heat preservation channel is effectively utilized, the effective release of the tissue stress and the internal stress is ensured, and the requirements of poor performance of the product and poor performance of the poker are also ensured.
The steel SWRH52B wire rod for the steel wire rope has the tensile strength of 820-867 MPa, the elongation of 16-22%, the reduction of area of 39-43% and nonmetallic inclusions (A + C is less than or equal to 2.0 and B + D is less than or equal to 1.5).
The preparation method of the steel wire rod for the steel wire rope only limits key process parameters, and further comprises the conventional steps of preparing steel, such as the process steps of molten iron pretreatment, billet slow cooling, sampling, inspection, judgment, packaging, warehouse delivery and the like. The proportion of the alloy elements mentioned in the invention is mass percent.
Example 1
The steel wire rod SWRH52B for the steel wire rope manufactured by adopting the technical scheme of the invention has the following specific implementation production steps:
1. smelting in a converter: 14% of scrap steel and 86% of molten iron; oxygen top-bottom combined blowing is carried out, the tapping temperature is 1595 ℃, the tapping end point C is 0.40 percent, the tapping end point P is 0.012 percent, and slag discharging is strictly forbidden.
2. Alloying the steel ladle: and adding lime, a pre-deoxidizer and an iron alloy for deoxidation alloying when tapping 1/4, wherein the argon blowing time is 5min. Adding target amount of steel alloy per ton: 8.2kg/t steel of manganese silicon, 0.8kg/t steel of ferrosilicon and 1.5kg/t steel of steel-making carburant.
3. Static argon blowing: the static argon blowing time is 8min, the temperature before treatment is 1540 ℃, the temperature after treatment is 1520 ℃, the pure calcium cored wire is fed at 1kg/t after the static argon blowing, and the wire feeding speed is 3m/s.
4. Refining in an LF furnace: white slag operation is required, and the slag alkalinity and the oxygen potential in slag are controlled under the condition of ensuring the slag fluidity; LF refining time is 60min, and total analysis temperature is 1545 ℃. Adding amount of auxiliary materials per ton steel: 7.33Kg/t of active lime, 0.73Kg/t of fluorite, 0.4Kg/t of carbide slag and 0.50Kg/t of carbonized rice husk, and the molten steel is detected from time to time, alloy is finely adjusted to ensure that the components of the molten steel meet the standard requirements, the soft blowing time is 12min, and a calcium line is fed for 80m.
5. Continuous casting: the electromagnetic stirring current of the crystallizer is 280A, the frequency is 5Hz, the crystallizer rotates forwards and backwards, the electromagnetic stirring current at the tail end is 300A, and the frequency is 8Hz. The platform temperature is 1553 ℃, the tundish temperature is 1520 ℃, the superheat degree is kept at 25 ℃, and the pulling speed is 2.4m/min. The whole process is casting-protected, and the crystallizer casting powder uses square billet medium carbon steel casting powder; the casting blank cutting adopts a mode of combining automation and manpower.
6. A heating process: heating with a stepping heating furnace at 860 deg.C for 45min in the preheating section, 1100 deg.C for 45min in the heating section, and at 1130 deg.C for 30min in the soaking section.
7. The rolling process comprises the following steps:
rough rolling temperature: 1000 ℃; finish rolling inlet temperature: 880 ℃; spinning temperature: 870 ℃; air-cooled roller table speed: the head roller way is 0.70m/s; the roller way speed increasing is set to be 5 percent.
A heat preservation channel: the heat preservation channel is effectively utilized, the effective release of the tissue stress and the internal stress is ensured, and the requirements of poor performance of the product and poor performance of the poker are also ensured.
Example 2
The steel wire rod SWRH52B for manufacturing the steel wire rope by adopting the technical scheme of the invention has the following concrete implementation production steps:
1. smelting in a converter: 15% of scrap steel and 85% of molten iron; oxygen top-bottom combined blowing is carried out, the tapping temperature is 1610 ℃, the tapping end point C is 0.45 percent, the tapping end point P is 0.014 percent, and slag discharging is strictly forbidden.
2. Alloying the steel ladle: lime, pre-deoxidizer and ferroalloy are added for deoxidation alloying when tapping 1/3, and argon blowing time is 6min. Adding target amount of steel alloy per ton: 8.5kg/t steel of manganese silicon, 0.9kg/t steel of ferrosilicon and 1.5kg/t steel of steel-making carburant.
3. Static argon blowing: the static argon blowing time is 9min, the temperature before treatment is 1550 ℃, the temperature after treatment is 1530 ℃, the pure calcium cored wire is fed at 1.1kg/t after the static argon blowing, and the wire feeding speed is 3m/s.
4. Refining in an LF furnace: white slag operation is required, and the slag alkalinity and the oxygen potential in slag are controlled under the condition of ensuring the slag fluidity; LF refining time is 70min, and total analysis temperature is 1560 ℃. Adding amount of auxiliary materials per ton steel: 7.5Kg/t of active lime, 0.75Kg/t of fluorite, 0.5Kg/t of carbide slag and 0.55Kg/t of carbonized rice husk, and the molten steel is detected at any time, alloy is finely adjusted to ensure that the components of the molten steel meet the standard requirements, the soft blowing time is 13min, and the calcium wire is fed for 100m.
5. Continuous casting: the electromagnetic stirring current of the crystallizer is 280A, the frequency is 5Hz, the crystallizer rotates forwards and backwards, the electromagnetic stirring current at the tail end is 300A, and the frequency is 8Hz. The platform temperature is 1558 ℃, the tundish temperature is 1525 ℃, the superheat degree is kept at 30 ℃, and the pulling speed is 2.5m/min. The whole process is casting-protected, and the crystallizer casting powder uses carbon steel casting powder in a square billet; the casting blank cutting adopts a mode of combining automation and manpower.
6. A heating process: heating in a stepping heating furnace at 880 ℃ in a preheating section for 60min, at 1120 ℃ in a heating section for 60min, at 1150 ℃ in a soaking section for 45min.
7. The rolling process comprises the following steps:
rough rolling temperature: 1020 ℃; finish rolling inlet temperature: 900 ℃; spinning temperature: 890 ℃; air-cooled roller table speed: the head roller way is 0.80m/s; the roller way speed increasing is set to be 4 percent.
A heat preservation channel: the heat preservation channel is effectively utilized, the effective release of the tissue stress and the internal stress is ensured, and the requirements of poor performance of the product and poor performance of the poker are also ensured.
Example 3
The steel wire rod SWRH52B for the steel wire rope manufactured by adopting the technical scheme of the invention has the following specific implementation production steps:
1. smelting in a converter: 16% of scrap steel and 84% of molten iron; oxygen top-bottom combined blowing is carried out, the tapping temperature is 1630 ℃, the tapping end point C is 0.55 percent, the tapping end point P is 0.011 percent, and slag discharging is strictly forbidden.
2. Alloying the steel ladle: and adding lime, a pre-deoxidizer and an iron alloy for deoxidation alloying when tapping 1/4, wherein the argon blowing time is 5min. Adding target amount of steel alloy per ton: 9.0kg/t of manganese silicon steel, 1.06kg/t of silicon iron steel and 2.4kg/t of steel-making carburant.
3. Static argon blowing: the static argon blowing time is 8min, the temperature before treatment is 1560 ℃, the temperature after treatment is 1540 ℃, the pure calcium cored wire is fed at 1.2kg/t after the static argon blowing, and the wire feeding speed is 3m/s.
4. Refining in an LF furnace: white slag operation is required, and the slag alkalinity and the oxygen potential in slag are controlled under the condition of ensuring the slag fluidity; LF refining time is 80min, and total analysis temperature is 1570 ℃. Adding amount of auxiliary materials per ton steel: 8Kg/t of active lime, 0.8Kg/t of fluorite, 0.6Kg/t of carbide slag and 0.60Kg/t of carbonized rice husk, and the molten steel is detected from time to time, alloy is finely adjusted to ensure that the components of the molten steel meet the standard requirements, the soft blowing time is 12min, and the calcium wire is fed for 150m.
5. Continuous casting: the electromagnetic stirring current of the crystallizer is 280A, the frequency is 5Hz, the crystallizer rotates forwards and backwards, the electromagnetic stirring current at the tail end is 300A, and the frequency is 8Hz. The platform temperature is 1563 ℃, the tundish temperature is 1530 ℃, the superheat degree is kept at 35 ℃, and the pulling speed is 2.6m/min. The whole process is casting-protected, and the crystallizer casting powder uses carbon steel casting powder in a square billet; the casting blank cutting adopts a mode of combining automation and manpower.
6. A heating process: heating with a walking beam furnace at preheating stage 900 deg.C for 65min, heating stage 1140 deg.C for 65min, and soaking stage 1170 deg.C for 50min.
7. The rolling process comprises the following steps:
rough rolling temperature: 1040 ℃; finish rolling inlet temperature: 920 ℃; spinning temperature: 910 deg.C; air-cooled roller table speed: the head roller way is 0.90m/s; the roller way speed increasing is set to be 2 percent.
A heat preservation channel: the heat preservation channel is effectively utilized, the effective release of the tissue stress and the internal stress is ensured, and the requirements of poor performance of the product and poor performance of the poker are also ensured.
Example 4
The steel wire rod SWRH52B for the steel wire rope manufactured by adopting the technical scheme of the invention has the following specific implementation production steps:
1. smelting in a converter: 15% of scrap steel and 85% of molten iron; oxygen top-bottom blowing is carried out, the tapping temperature is 1610 ℃, the tapping end point C is 0.50 percent, P is 0.015 percent, and slag discharging is strictly forbidden.
2. Alloying the steel ladle: and adding lime, a pre-deoxidizer and an iron alloy for deoxidation alloying when tapping 1/3, wherein the argon blowing time is 5min. Adding target amount of steel alloy per ton: 8.5kg/t steel of manganese silicon, 1.0kg/t steel of ferrosilicon and 2.0kg/t steel of steel-making carburant.
3. Static argon blowing: the static argon blowing time is 8min, the temperature before treatment is 1550 ℃, the temperature after treatment is 1530 ℃, the pure calcium cored wire is fed at 1.1kg/t after the static argon blowing, and the wire feeding speed is 3m/s.
4. Refining in an LF furnace: white slag operation is required, and the slag alkalinity and the oxygen potential in slag are controlled under the condition of ensuring the slag fluidity; LF refining time is 70min, and total analysis temperature is 1560 ℃. Adding amount of auxiliary materials per ton steel: 7.5Kg/t of active lime, 0.78Kg/t of fluorite, 0.55Kg/t of carbide slag and 0.55Kg/t of carbonized rice husk, and the molten steel is detected from time to time, alloy is finely adjusted to ensure that the components of the molten steel meet the standard requirements, the soft blowing time is 12min, and a calcium line is fed for 130m.
5. Continuous casting: the electromagnetic stirring current of the crystallizer is 280A, the frequency is 5Hz, the crystallizer rotates forwards and backwards, the electromagnetic stirring current at the tail end is 300A, and the frequency is 8Hz. The platform temperature is 1558 ℃, the tundish temperature is 1520 ℃, the superheat degree is kept at 30 ℃, and the pulling speed is 2.5m/min. The whole process is casting-protected, and the crystallizer casting powder uses carbon steel casting powder in a square billet; the casting blank cutting adopts a mode of combining automation and manpower.
6. A heating process: heating in a stepping heating furnace at 880 ℃ in a preheating section for 45min, at 1120 ℃ in a heating section for 45min, at 1150 ℃ in a soaking section for 30min.
7. The rolling process comprises the following steps:
rough rolling temperature: 1020 ℃; finish rolling inlet temperature: 900 ℃; spinning temperature: 890 ℃; air-cooled roller table speed: the head roller way is 0.85m/s; the roller way speed increasing is set to be 3 percent.
A heat preservation channel: the heat preservation channel is effectively utilized, the effective release of the tissue stress and the internal stress is ensured, and the requirements of poor performance of the product and poor performance of the poker are also ensured.
Product inspection and performance testing
The final products of examples 1 to 4 were subjected to chemical composition inspection, casting slab low-magnification defect inspection, mechanical property inspection, and microscopic structure and non-metallic inclusion inspection, respectively. The test results are shown in tables (1) to (4):
table (1) results of chemical composition test:
| number of | C | Si | Mn | P | S | O | N |
| Example 1 | 0.52 | 0.22 | 0.61 | 0.02 | 0.009 | 0.0028 | 0.002 |
| Example 2 | 0.53 | 0.21 | 0.62 | 0.015 | 0.008 | 0.005 | 0.005 |
| Example 3 | 0.53 | 0.22 | 0.76 | 0.012 | 0.012 | 0.004 | 0.0045 |
| Example 4 | 0.52 | 0.22 | 0.74 | 0.012 | 0.007 | 0.0055 | 0.006 |
Table (2) inspection results of low-magnification defects of casting blanks:
TABLE (3) mechanical Properties
Table (4) microstructure and non-metallic inclusions:
according to the inspection results of tables (1) - (4), the quality of steel wire rod SWRH52B products for steel wire ropes is effectively improved, the purity of steel is ensured, the surface quality of casting blanks is improved and internal cracks and center defects are reduced by adopting crystallizer electromagnetic stirring and tail end electromagnetic stirring in continuous casting; the strength of the wire rod meets the requirements of mechanical property and drawing property by optimizing the rolling and cooling control process of steel rolling.
Claims (9)
1. A steel wire rod for a steel wire rope is characterized in that: the alloy components of the wire rod are as follows: 0.49-0.56% C, 0.15-0.35% Si, 0.60-0.90% Mn, ≦ 0.020% P, ≦ 0.020% S, ≦ 0.20% Cr, ≦ 0.20% Ni, ≦ 0.20% Cu, the balance Fe and unavoidable impurities.
2. The wire rod according to claim 1, wherein: the tensile strength of the wire rod is 800-920 MPa, the elongation is more than or equal to 13%, the reduction of area is more than or equal to 39%, the nonmetallic inclusion A + C is less than or equal to 2.0, the B + D is less than or equal to 1.5, and the depth of a total decarburized layer is less than or equal to 1.5 Dm.
3. The method for producing a steel wire rod for a steel wire rope according to claim 1, characterized by comprising: the method sequentially comprises the steps of converter smelting, ladle alloying, static argon blowing, LF furnace refining, square billet continuous casting, heating of a stepping heating furnace and rolling, wherein the converter smelting comprises the following steps: according to the mass percentage, 14-16 percent of scrap steel, 84-86 percent of molten iron and oxygen top-bottom combined blowing are carried out, the tapping temperature is 1595-1630 ℃, the tapping end point C is 0.40-0.55 percent, P is less than or equal to 0.015 percent, and slag is strictly forbidden.
4. The method of claim 3, wherein: the steel ladle alloying is as follows: lime, a pre-deoxidizer and an iron alloy are added for deoxidation alloying when tapping is carried out for 1/4-1/3, and the argon blowing time is more than or equal to 5min; the addition amount of each ton of steel alloy is as follows: 8.2-9.0 kg/t steel of manganese silicon, 0.8-1.06 kg/t steel of ferrosilicon and 1.5-2.4 kg/t steel of steel-making carburant.
5. The method of claim 3, wherein: the static argon blowing step comprises the following steps: the static argon blowing time is more than or equal to 8min, the temperature before treatment is 1540-1560 ℃, the temperature after treatment is 1520-1540 ℃, the pure calcium cored wire is fed at 1-1.2 kg/t after the static argon blowing, and the wire feeding speed is 3m/s.
6. The method of claim 3, wherein: the LF furnace refining step requires white slag operation, and the slag alkalinity and the oxygen potential in the slag are controlled under the condition of ensuring the slag fluidity; LF refining time is 60-80 min, and total analysis temperature is 1545-1570 ℃; the addition amount of auxiliary materials per ton steel is as follows: 7.33 to 8Kg/t of active lime, 0.73 to 0.8Kg/t of fluorite, 0.4 to 0.6Kg/t of carbide slag and 0.50 to 0.60Kg/t of carbonized rice husk, and the molten steel is detected in real time, alloy is finely adjusted to ensure that the components of the molten steel meet the standard requirements, the soft blowing time is more than or equal to 12min, and the calcium wire is fed for 80 to 150m.
7. The method of claim 3, wherein: the continuous casting comprises the following steps: electromagnetic stirring current of a crystallizer is 280A, frequency is 5Hz, forward and reverse rotation is carried out, electromagnetic stirring current of the tail end is 300A, and frequency is 8Hz; the platform temperature is 1558 +/-5 ℃, the tundish temperature is 1520-1530 ℃, the superheat degree is kept at 25-35 ℃, and the pulling speed is 2.4-2.6 m/min; the whole process is casting-protected, and the crystallizer casting powder uses carbon steel casting powder in a square billet; the casting blank cutting adopts a mode of combining automation and manpower.
8. The method of claim 3, wherein: the heating of the heating furnace is as follows: heating by a stepping heating furnace, wherein the temperature of a preheating section is 860-900 ℃ for 45-65 min, the temperature of a heating section is 1100-1140 ℃, the heating time is 45-65 min, the temperature of a soaking section is 1130-1170 ℃, the heating time is 30-50 min, and the total heating time is 2-3 h.
9. The method of claim 3, wherein: the rolling steps are as follows: rough rolling temperature: 1000 ℃ to 1040 ℃, finish rolling entrance temperature: 880-920 ℃, spinning temperature: 870 ℃ -910 ℃, air-cooled roller bed speed: the head roller way is 0.70-0.90 m/s, and the roller way speed increasing is set to be 2-5%.
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| CN109234508A (en) * | 2018-10-10 | 2019-01-18 | 邢台钢铁有限责任公司 | A kind of medium carbon steel wire rod and its production method with high intensity and high-ductility |
| WO2021056633A1 (en) * | 2019-09-26 | 2021-04-01 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for ultrahigh-strength steel cord and manufacturing method therefor |
| CN113969376A (en) * | 2021-11-01 | 2022-01-25 | 新疆八一钢铁股份有限公司 | Preparation method of wire rod for suspension cable steel wire |
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| CN114686780A (en) * | 2022-04-26 | 2022-07-01 | 江苏永钢集团有限公司 | Steel wire rod for heat-reducing treatment of ultra-fine steel cord and production process |
| CN114871397A (en) * | 2022-03-28 | 2022-08-09 | 本钢板材股份有限公司 | High-quality steel wire rod for cold heading and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109234508A (en) * | 2018-10-10 | 2019-01-18 | 邢台钢铁有限责任公司 | A kind of medium carbon steel wire rod and its production method with high intensity and high-ductility |
| WO2021056633A1 (en) * | 2019-09-26 | 2021-04-01 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for ultrahigh-strength steel cord and manufacturing method therefor |
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| CN114871397A (en) * | 2022-03-28 | 2022-08-09 | 本钢板材股份有限公司 | High-quality steel wire rod for cold heading and preparation method thereof |
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