CN-122013048-A - Production process of 90Si steel wire for steel strand

CN122013048ACN 122013048 ACN122013048 ACN 122013048ACN-122013048-A

Abstract

The invention relates to the technical field of wire rod production, in particular to a production process of a 90Si steel wire for a steel strand, which comprises the steps of 1) adopting a 90Si wire rod, wherein the components comprise C0.89% -0.96%, si 0.88% -0.91%, mn0.40% -0.45%, 2) drawing a semi-finished product, wherein the air cooling wind pressure of a wire drawing machine is 0.3-0.6 MPa, the flow rate is 3000-5000 m3/h, the die temperature is 100-120 ℃, the water cooling water inlet is less than or equal to 25 ℃, 3) heat treatment comprises the steps of first-stage furnace temperature 1000 ℃ +/-5 ℃, second-stage furnace temperature 980 ℃ +/-5 ℃, third-stage furnace temperature 960 ℃ +/-5 ℃, fourth-stage furnace temperature 940 ℃ +/-5 ℃, lead bath 560 ℃ +/-5 ℃, DV value 55mm & m/min, obtaining the spacing of a sorbite sheet is 0.1-0.15 mu m, 4) phosphating saponification, 5) drawing of a finished product, the first-stage three-stage compression rate is 13% -15%, the middle 12% -14%, the temperature is 9% -14%, and the pressure of a zinc wire is kept to be equal to 25MPa, and the pressure of a wire rod is 25-15 mm after the three-stage furnace temperature is 25MPa, and the temperature is equal to 25 mm-15 mm. The steel wire of the invention has high zinc layer weight and ultrahigh tensile strength.

Inventors

WANG YING
LIU JIAN
QIAO GUANNAN

Assignees

鞍钢钢绳有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260319

Claims (2)

1. The production process of the 90Si steel wire for the steel strand is characterized by comprising the following specific steps: 1) The raw material is 90Si steel wire rods, and the chemical components of the steel wire rods meet the requirements of 0.89% -0.96% of C, 0.88% -0.91% of Si and 0.40% -0.45% of Mn; 2) Drawing a semi-finished product: Wire drawing machine in drawing process the air pressure of the air cooling is 0.3-0.6 MPa the air cooling flow is 3000-5000 m3/h, the temperature of the wire drawing die is controlled to be 100-120 ℃, and the water cooling inlet temperature of the wire drawing die is less than or equal to 25 ℃; 3) Heat treatment, namely, a first-stage furnace temperature of 1000 ℃ plus or minus 5 ℃, a second-stage furnace temperature of 980 ℃ plus or minus 5 ℃, a third-stage furnace temperature of 960 ℃ plus or minus 5 ℃, a fourth-stage furnace temperature of 940 ℃ plus or minus 5 ℃, a lead bath of 560 ℃ plus or minus 5 ℃ and DV value of 55mm m/min, wherein the spacing between sorbite sheets in the steel wire is 0.1-0.15 mu m, slag bonding at the front outlet and the rear outlet of the lead bath is avoided, and lead hanging on the surface of the steel wire is avoided; 4) Molten salt pre-descaling, namely immersing the steel wire into a molten alkali tank at 400-450 ℃ for 3-8 min, wherein the molten alkali tank comprises 60-70% of NaOH and 3 -40% of NaNO; 5) Carrying out pickling, phosphating and saponification on the steel wire, wherein the concentration of hydrochloric acid is 100-200 g/L; The temperature of hot water washing after acid washing is 60-70 ℃, and the concentration of FeCl 2 is controlled to be less than or equal to 120g/L; phosphating, namely, total phosphating acidity is 50-60 Pt, free acid is 3-4 Pt, the temperature is 70-75 ℃, and the soaking time T=10-0.6D (min) according to the diameter D of the steel wire; 6) Drawing a finished product, namely drawing by a wire drawing machine for 9-12 times, wherein the single-pass compression rate of the first three times is controlled to be 13% -15%, the middle pass is controlled to be 12% -14%, the last three times is controlled to be 9% -11%, the position of a die box is adjusted, and the consistency of the wire after exiting a wire drawing die and the tangential paying-off of a winding drum is ensured; 7) And hot galvanizing, namely, the surface of the steel wire is treated cleanly by the pre-galvanizing treatment, the zinc temperature is controlled within the range of 445-455 ℃ after entering a zinc pot, the distance between an air knife is controlled to be 15-25 mm, the pressure is controlled to be 0.15-0.25 MPa, the steel wire is uniformly wiped by the air knife, and the surface of a zinc layer is smooth.
2. The process for producing steel wires for steel strands according to claim 1, wherein the diameter of the steel wires produced by the process is 4-5.5 mm, the weight of a zinc layer is more than 275g/m2, the tensile strength is more than 2060MPa, the product torsion times are more than 15 times, and the bending times are more than 8 times.

Description

Production process of 90Si steel wire for steel strand Technical Field The invention belongs to the technical field of wire rod production, and particularly relates to a production process of a 90Si steel wire for a steel strand. Background With the continuous development of the steel strands for the bridge steel cable towards the high strength direction, the requirement of ultra-high strength (2060 MPa) is provided for the galvanized steel wires with large diameter (more than 4.0 mm) on the outer layers of the steel strands, the weight of the zinc layer also needs to meet the class A standard (the weight of the zinc layer reaches more than 275g/m 2), and meanwhile, the steel strands also have good corrosion resistance and reach the highest standard of galvanized class A. At present, the galvanized A-type high-strength steel wires with the diameters of more than 4.0mm are produced at home by adopting an electrogalvanizing process, the loss of tensile strength after galvanization is smaller, and the high-strength requirement can be met. However, the environment pollution of the electrogalvanizing is serious, and the electrogalvanizing is the obsolete production. Or the production of the zinc layer after hot galvanizing by adopting a drawing mode can not meet the requirements of a class A thick zinc layer. Disclosure of Invention The invention aims to provide a production process of a 90Si steel wire for a steel strand, which has high zinc layer weight and ultrahigh tensile strength. In order to achieve the above purpose, the invention adopts the following technical scheme: The production process of the 90Si steel wire for the steel strand comprises the following specific steps: 1) The raw material is 90Si steel wire rods, and the chemical components of the steel wire rods meet the requirements of 0.89% -0.96% of C, 0.88% -0.91% of Si and 0.40% -0.45% of Mn; 2) Drawing a semi-finished product: Wire drawing machine in drawing process the air pressure of the air cooling is 0.3-0.6 MPa the air cooling flow is 3000-5000 m3/h, the temperature of the wire drawing die is controlled to be 100-120 ℃, and the water cooling inlet temperature of the wire drawing die is less than or equal to 25 ℃; 3) Heat treatment, namely, a first-stage furnace temperature of 1000 ℃ plus or minus 5 ℃, a second-stage furnace temperature of 980 ℃ plus or minus 5 ℃, a third-stage furnace temperature of 960 ℃ plus or minus 5 ℃, a fourth-stage furnace temperature of 940 ℃ plus or minus 5 ℃, a lead bath of 560 ℃ plus or minus 5 ℃ and DV value of 55mm m/min, wherein the spacing between sorbite sheets in the steel wire is 0.1-0.15 mu m, slag bonding at the front outlet and the rear outlet of the lead bath is avoided, and lead hanging on the surface of the steel wire is avoided; 4) Molten salt pre-descaling, namely immersing the steel wire into a molten alkali tank at 400-450 ℃ for 3-8 min, wherein the molten alkali tank comprises 60-70% of NaOH and 3 -40% of NaNO; 5) Carrying out pickling, phosphating and saponification on the steel wire, wherein the concentration of hydrochloric acid is 100-200 g/L; The temperature of hot water washing after acid washing is 60-70 ℃, and the concentration of FeCl 2 is controlled to be less than or equal to 120g/L; phosphating, namely, total phosphating acidity is 50-60 Pt, free acid is 3-4 Pt, the temperature is 70-75 ℃, and the soaking time T=10-0.6D (min) according to the diameter D of the steel wire; 6) Drawing a finished product, namely drawing by a wire drawing machine for 9-12 times, wherein the single-pass compression rate of the first three times is controlled to be 13% -15%, the middle pass is controlled to be 12% -14%, the last three times is controlled to be 9% -11%, the position of a die box is adjusted, and the consistency of the wire after exiting a wire drawing die and the tangential paying-off of a winding drum is ensured; 7) And hot galvanizing, namely, the surface of the steel wire is treated cleanly by the pre-galvanizing treatment, the zinc temperature is controlled within the range of 445-455 ℃ after entering a zinc pot, the distance between an air knife is controlled to be 15-25 mm, the pressure is controlled to be 0.15-0.25 MPa, the steel wire is uniformly wiped by the air knife, and the surface of a zinc layer is smooth. The diameter of the steel wire produced by the production process of the steel wire for the steel strand is 4-5.5 mm, the weight of the zinc layer is more than 275g/m < 2 >, the tensile strength is more than 2060MPa, the torsion times of the product are more than 15 times, and the bending times are more than 8 times. Compared with the prior art, the invention has the beneficial effects that: the beneficial effects of the invention are mainly represented in the following aspects: 1. the invention successfully adopts a hot galvanizing process to replace the traditional electrogalvanizing process to produce the large-diameter high-strength galvanized steel wire. The method t