High-carbon tire cord steel high-strength steel wire high-speed drawing production process

Abstract

The invention relates to a high-speed drawing production process for a high-strength steel wire of high-carbon tire cord steel. The high-speed drawing production process comprises the following steps: 1) taking a high-carbon tire cord steel wire rod as a raw material; (2) semi-finished product drawing is conducted, specifically, the tolerance range of the drawn semi-finished product is + / -0.02 mm, the production speed is 5-6 m / s, and air cooling and water cooling are conducted during drawing; 3) heat treatment: the heat treatment line temperature is in a range of 950 + / -5 DEG C, and the lead bath temperature is kept in a range of 550 + / -5 DEG C; 4) surface treatment: phosphating, wherein the mass of a phosphating film is 5-6g / m < 2 >; and (5) drawing is conducted through a wire drawing machine, the drawing pass is 11-12, the average compression ratio is 15%-17%, the drawing compression ratio of the first pass is 1.05 times of the average compression ratio, the drawing speed is larger than or equal to 10 m / s, the temperature of the drawn steel wire reaches 100-130 DEG C, the steel wire is forcibly cooled on a winding drum, and the surface of the steel wire is coated with high-temperature-resistant wire drawing powder. The average drawing speed of the high-carbon tire cord steel wire is increased to more than 10m / s, and meanwhile, the drawing qualification rate of the steel wire is increased.

Description

Technical Field

[0001] The invention relates to the technical field of steel rope production, and in particular to a high-speed drawing production process for high-carbon cord steel high-strength steel wire. Background Art

[0002] In the process of steel wire drawing, in order to obtain high-strength steel wire, high-carbon steel wire rod is usually selected as raw material. When the carbon content of steel increases, the strength of steel wire increases. If the drawing speed is too fast, the temperature of the wire drawing die will increase, and the performance of steel wire will decrease. The carbon content of cord steel is greater than 0.8%, but the wire drawing speed is slow, the average drawing speed is 4m / s, and the drawing efficiency is low. In order to solve this problem, a high-speed drawing production process of high-carbon cord steel high-strength steel wire is invented. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a high-carbon cord steel high-strength steel wire high-speed drawing production process, using the characteristics of high-carbon cord steel, formulating a corresponding production process, controlling the temperature during the drawing process, and increasing the drawing speed.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A high-carbon cord steel high-strength steel wire high-speed drawing production process, the steps are:

[0006] 1) Select raw materials: the raw materials are high carbon cord steel wire rods;

[0007] 2) Drawing of semi-finished products: The tolerance range of drawing semi-finished products is ±0.02mm, the production speed is 5-6m / s, and the drawing process is air-cooled and water-cooled;

[0008] 3) Heat treatment: The heat treatment line temperature is within the range of 950±5℃, and the lead bath temperature is maintained within the range of 550±5℃;

[0009] 4) Surface treatment: phosphating treatment, phosphating film quality 5-6g / m 2 ;

[0010] 5) Finished product drawing: Wire drawing machine drawing, drawing passes are 11-12 times, average compression rate is 15%-17%, the first drawing compression rate is 1.05 times the average compression rate, drawing speed is ≥10m / s, the temperature of the drawn steel wire reaches 100℃-130℃, the steel wire is forced to cool on the reel, the wire accumulation height on the reel is controlled to exceed two-thirds of the reel height, and the cooling water inlet temperature is controlled below 20℃, the center line of the mold box outlet is adjusted to be consistent with the tangent direction of the reel, and the surface of the steel wire is coated with high temperature resistant drawing powder.

[0011] Step 1) The carbon content of the high carbon cord steel is 0.82%-0.85%.

[0012] Step 4) The concentration of pickling hydrochloric acid in the phosphating liquid is 160-180 g / l, ferrous chloride ≤ 300 g / l, the total acidity of the phosphating liquid is 120-130 Pt, the free acid is 20-25 Pt, the temperature is 70-80°C, and the immersion time is 15-30 min.

[0013] Step 5) The working temperature of the high temperature resistant drawing powder is below 180°C.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Since the cord steel has the characteristics of uniform mechanical properties, high area reduction rate, high troostitization rate, high wire rod dimensional accuracy, and no obvious central segregation, no surface decarburization and other defects. The corresponding production process is formulated by utilizing the characteristics of cord steel. Since the initial temperature of the raw material is low, the compression rate of the first pass is increased, the drawing temperature can be effectively controlled, and the water inlet temperature of the water cooling is controlled to avoid high heat generation during the drawing process, thereby achieving the purpose of high-speed drawing. The average drawing speed of high-carbon cord steel wire is increased to more than 10m / s. The improved process is used to improve production efficiency and the qualified rate of steel wire drawing is increased to 98%. DETAILED DESCRIPTION

[0016] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] A high-carbon cord steel high-strength steel wire high-speed drawing production process, the process steps are:

[0018] 1) Select raw materials: the raw materials are high carbon cord steel wire rods;

[0019] 2) Drawing of semi-finished products: The tolerance range of drawing semi-finished products is: ±0.02mm, the production speed is: 5-6m / s, during drawing, ensure that the air cooling and water cooling are normal, ensure that the mold is free of defects, and control the surface quality of the steel wire;

[0020] 3) Heat treatment: The heat treatment line temperature is within the range of 950±5℃, the lead bath temperature is maintained within the range of 550±5℃, there is no slag at the front and rear outlets of the lead bath, and there is no lead hanging on the surface of the semi-finished product;

[0021] 4) Surface treatment: The concentration of pickling hydrochloric acid in the phosphating liquid is 160-180g / l, ferrous chloride ≤300g / l, the total acidity of the phosphating liquid is 120-130Pt, the free acid is 20-25Pt, the temperature is 70-80℃, the immersion time is 15-30min, and the phosphating film quality is guaranteed to be 5-6g / m 2 ;

[0022] 5) Finished product drawing: Use a wire drawing machine for multi-pass drawing, control the drawing passes to 11-12 passes, the average compression rate is 15%-17% during process calculation, the first drawing compression rate is 1.05 times the average compression rate, the drawing speed is ≥10m / s, the temperature of the drawn steel wire reaches 100℃-130℃, and replace a set of wire drawing dies every 16 hours to ensure the quality of the steel wire after drawing. During the drawing process, the steel wire is forced to cool on the drum, and the wire accumulation height on the drum is controlled to exceed two-thirds of the drum height. At the same time, the cooling water inlet temperature is controlled below 20°C to ensure that the die box water-cooling box and the drum are well cooled during the steel wire drawing process and to control deformation aging; the center line of the die box outlet is adjusted to be consistent with the tangent direction of the drum; a 180°C resistant wire drawing powder is used for surface coating. The wire drawing powder is easy to adhere to the surface of the steel wire and can still ensure its lubricity at 180°C, so that the wire drawing powder will not fail due to high temperature when a large amount of heat is generated during high-speed drawing and the temperature rises sharply, thereby ensuring a good lubrication effect, thereby reducing heat generation during the drawing process, controlling the deformation aging of the steel wire, and ensuring the mechanical properties of the steel wire.

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Embodiment 1:

[0025] Use 10.0mm wire rod to produce 3.0mm diameter steel wire, production process:

[0026] 1) Raw material selection: The raw material is LX80b high carbon cord steel 10.0 mm wire rod; the carbon content is 0.83%.

[0027] 2) Drawing of semi-finished products: The diameter of the drawn semi-finished products is 8.0mm, the tolerance range is ±0.02mm, the production speed is 5m / s, and the air cooling and water cooling are normal during drawing, the mold is free of defects, and the surface quality of the steel wire is controlled.

[0028] 3) Heat treatment: Ensure that the heat treatment line temperature is within the range of 950 ± 5 ° C, the lead bath temperature is maintained within the range of 550 ± 5 ° C, ensure that there is no slag at the front and rear outlets of the lead bath, and no lead hanging on the surface of the semi-finished product;

[0029] 4) Surface treatment: The concentration of pickling hydrochloric acid in the phosphating liquid is 180g / l, ferrous chloride is 200g / l, the total acidity of the phosphating liquid is 125Pt, the free acid is 23Pt, the temperature is 75℃, the immersion time is 20min, and the phosphating film mass is 6g / m 2 ;

[0030] 5) Finished product drawing: Italian MARIO FRIGERIO wire drawing machine is used for multi-pass drawing, and the drawing passes are controlled at 11 passes. The average compression rate is 16.33% during process calculation, the first drawing compression rate is 17.15%, the drawing speed is 10m / s, the temperature of the drawn steel wire reaches 120℃-130℃, and a set of wire drawing dies is replaced every 16 hours to ensure the quality of the steel wire after drawing. During the drawing process, the steel wire is forced to cool on the drum, and the wire accumulation height on the drum is controlled to exceed two-thirds of the drum height. At the same time, the cooling water inlet temperature is controlled below 20°C to ensure that the die box water-cooling box and the drum are well cooled during the wire drawing process and to control deformation aging; the die box outlet center line is adjusted to be consistent with the tangent direction of the drum; the French CONDAT N50 special wire drawing powder is used, which can still ensure its lubricity at 180°C, so that the wire drawing powder will not fail due to high temperature when a large amount of heat is generated during high-speed drawing and the temperature rises sharply, thereby ensuring a good lubrication effect, thereby reducing heat generation during the drawing process, controlling the deformation aging of the steel wire, and ensuring the mechanical properties of the steel wire.

[0031] This embodiment has a drawing speed of 10 m / s, a strength of 1960 MPa, a tolerance of ±0.02 mm, 30 twists, and 16 bends, meeting national standard requirements.

[0032] Embodiment 2:

[0033] Use 10.0mm wire rod to produce 2.6mm diameter steel wire, production process:

[0034] 1) Raw material selection: The raw material is LX80b high carbon cord steel 10.0 mm wire rod; the carbon content is 0.83%.

[0035] 2) Drawing of semi-finished products: The diameter of the drawn semi-finished products is 7.2mm, the tolerance range is ±0.02mm, and the production speed is 5.2m / s. During drawing, ensure that the air cooling and water cooling are normal, ensure that the mold is free of defects, and control the surface quality of the steel wire.

[0036] 3) Heat treatment: Ensure that the heat treatment line temperature is within the range of 950 ± 5 ° C, the lead bath temperature is maintained within the range of 550 ± 5 ° C, ensure that there is no slag at the front and rear outlets of the lead bath, and no lead hanging on the surface of the semi-finished product;

[0037] 4) Surface treatment: The concentration of pickling hydrochloric acid in the phosphating liquid is 170g / l, ferrous chloride is 210g / l, the total acidity of the phosphating liquid is 123Pt, the free acid is 22Pt, the temperature is 75℃, the immersion time is 18min, and the phosphating film mass is 5g / m 2 ;

[0038] 5) Finished product drawing: Use the Italian imported MARIO FRIGERIO wire drawing machine for multi-pass drawing, control the drawing passes to 12 passes, the average compression rate is 15.61% during process calculation, the first drawing compression rate is 16.39%, the drawing speed is 10.2m / s, the temperature of the drawn steel wire reaches 120℃-130℃, and replace a set of wire drawing dies every 16 hours to ensure the quality of the steel wire after drawing. During the drawing process, the steel wire is forced to cool on the drum, and the wire accumulation height on the drum is controlled to exceed two-thirds of the drum height. At the same time, the cooling water inlet temperature is controlled below 20°C to ensure that the die box water-cooling box and the drum are well cooled during the steel wire drawing process and to control deformation aging; the die box outlet center line is adjusted to be consistent with the tangent direction of the drum; the French CONDAT N50 special wire drawing powder is used. This wire drawing powder is easy to adhere to the surface of the steel wire and has high temperature resistance. It can still ensure its lubricity at 180°C, so that the wire drawing powder will not fail due to high temperature when a large amount of heat is generated during high-speed drawing and the temperature rises sharply, thereby ensuring a good lubrication effect, thereby reducing heat generation during the drawing process, controlling the deformation aging of the steel wire, and ensuring the mechanical properties of the steel wire.

[0039] The steel wire strength of this embodiment is 1960 MPa, the drawing speed is 10.2 m / s, the tolerance is ±0.02 mm, it is twisted 28 times, and bent 15 times, meeting the national standard requirements.

[0040] Embodiment 3:

[0041] Use raw material 10.0mm to produce 2.3mm diameter steel wire, production process:

[0042] 1) Raw material selection: The raw material is LX80b high carbon cord steel 10.0 mm wire rod; the carbon content is 0.84%.

[0043] 2) Drawing of semi-finished products: The diameter of the drawn semi-finished products is 6.5mm, the tolerance range is ±0.02mm, the production speed is 5.5m / s, and the air cooling and water cooling are normal during drawing, the mold is free of defects, and the surface quality of the steel wire is controlled.

[0044] 3) Heat treatment: Ensure that the heat treatment line temperature is within the range of 950 ± 5 ° C, the lead bath temperature is maintained within the range of 550 ± 5 ° C, ensure that there is no slag at the front and rear outlets of the lead bath, and no lead hanging on the surface of the semi-finished product;

[0045] 4) Surface treatment: The concentration of pickling hydrochloric acid in the phosphating liquid is 175g / l, ferrous chloride is 210g / l, the total acidity of the phosphating liquid is 120Pt, the free acid is 20Pt, the temperature is 77℃, the immersion time is 16min, and the phosphating film mass is 5g / m 2 ;

[0046] 5) Finished product drawing: Use the Italian imported MARIO FRIGERIO wire drawing machine for multi-pass drawing, control the drawing passes to 12 passes, the average compression rate is 15.9% during process calculation, the first drawing compression rate is 16.70%, the drawing speed is 10.1m / s, the temperature of the drawn steel wire reaches 120℃-130℃, and replace a set of wire drawing dies every 16 hours to ensure the quality of the steel wire after drawing. During the drawing process, the steel wire is forced to cool on the drum, and the wire accumulation height on the drum is controlled to exceed two-thirds of the drum height. At the same time, the cooling water inlet temperature is controlled below 20°C to ensure that the die box water-cooling box and the drum are well cooled during the steel wire drawing process and to control deformation aging; the die box outlet center line is adjusted to be consistent with the tangent direction of the drum; the French CONDAT N50 special wire drawing powder is used. This wire drawing powder is easy to adhere to the surface of the steel wire and has high temperature resistance. It can still ensure its lubricity at 180°C, so that the wire drawing powder will not fail due to high temperature when a large amount of heat is generated during high-speed drawing and the temperature rises sharply, thereby ensuring a good lubrication effect, thereby reducing heat generation during the drawing process, controlling the deformation aging of the steel wire, and ensuring the mechanical properties of the steel wire.

[0047] The steel wire strength of this embodiment is 1960 MPa, the drawing speed is 10.1 m / s, the tolerance is ±0.02 mm, it is twisted 32 times, and bent 16 times, which meets the national standard requirements.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and basic spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-carbon cord steel high-strength steel wire high-speed drawing production process, characterized in that: The steps are: 1) Select raw materials: the raw materials are high carbon cord steel wire rods; 2) Drawing of semi-finished products: The tolerance range of drawing semi-finished products is ±0.02mm, the production speed is 5-6m / s, and the drawing process is air-cooled and water-cooled; 3) Heat treatment: The heat treatment line temperature is within the range of 950±5℃, and the lead bath temperature is maintained within the range of 550±5℃; 4) Surface treatment: phosphating treatment, phosphating film quality 5-6g / m 2 ; 5) Finished product drawing: Wire drawing machine drawing, drawing passes are 11-12 times, average compression rate is 15%-17%, the first drawing compression rate is 1.05 times the average compression rate, drawing speed is ≥10m / s, the temperature of the drawn steel wire reaches 100℃-130℃, the steel wire is forced to cool on the reel, the wire accumulation height on the reel is controlled to exceed two-thirds of the reel height, and the cooling water inlet temperature is controlled below 20℃, the center line of the mold box outlet is adjusted to be consistent with the tangent direction of the reel, and the surface of the steel wire is coated with high temperature resistant drawing powder.

2. The high-strength steel wire high-speed drawing production process of high-carbon cord steel according to claim 1, characterized in that: Step 1) The carbon content of the medium-high carbon cord steel is 0.82%-0.85%.

3. The high-strength steel wire high-speed drawing production process of high-carbon cord steel according to claim 1, characterized in that: In step 4), the concentration of pickling hydrochloric acid in the phosphating liquid is 160-180 g / l, ferrous chloride is ≤300 g / l, the total acidity of the phosphating liquid is 120-130 Pt, the free acid is 20-25 Pt, the temperature is 70-80° C., and the immersion time is 15-30 min.

4. The high-strength steel wire high-speed drawing production process of high-carbon cord steel according to claim 1, characterized in that: The working temperature of the high temperature resistant wire drawing powder in step 5) is below 180°C.