CN-122007202-A - Production process of 95MnNbA steel wire for ultrahigh-strength traction rope

Abstract

The invention belongs to the technical field of wire rod production, and particularly relates to a 95MnNbA steel wire production process for an ultra-high strength traction rope, which comprises the following steps of 1) taking a 95MnNbA steel wire rod as a raw material, 2) carrying out circulating water cooling on a wire drawing machine winding drum and a die box in the drawing process, controlling the temperature of a die to be lower than 90 ℃, 3) carrying out heat treatment, ensuring the wire temperature to be 925-935 ℃, keeping the lead bath temperature to be 550-560 ℃, 4) carrying out acid washing on the heat treated steel wire, 5) carrying out hot galvanizing, controlling the zinc temperature to be 450-460 ℃, 6) immersing the galvanized steel wire into a low-concentration phosphating tank for microphosphorizing, and 7) carrying out drawing on a finished product by adopting 11-12 passes through a wire drawing machine, wherein the first single-pass compression rate is controlled to be 15% -17%, the total compression rate is controlled to be 85% -92%, the average compression rate of all passes is controlled to be 16-18%, and the last three passes use of a special wire drawing die. The strength and toughness of the steel wire are synchronously improved.

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. 1. The production process of the 95MnNbA steel wire for the ultra-high strength traction rope is characterized by comprising the following specific steps of: 1) The raw material is 95MnNbA steel wire rods, and the mass percentage of the chemical components is 0.95-1.0% of C, 0.30-0.33% of Si, 0.79-0.82% of Mn and 0.02-0.03% of Nb; 2) Drawing the semi-finished product, namely circularly water-cooling a wire drawing machine winding drum and a die box in the drawing process, wherein the water-cooling inlet temperature is less than 20 ℃, the die temperature is controlled to be less than 90 ℃, wire drawing powder is sufficient, and lubrication is ensured to be sufficient; 3) Heat treatment, namely ensuring that the wire temperature is within the range of 935-945 ℃, DV value is 35-45 mm m/min, lead bath temperature is kept within the range of 550-560 ℃, slag formation at front and rear outlets of the lead bath is avoided, lead hanging is avoided on the surface of a steel wire, and the sorbite rate obtained in the steel wire is more than 95%; 4) Pickling the steel wire after heat treatment, wherein the concentration of hydrochloric acid in pickling is 170-200 g/L, the temperature of hot water washing after pickling is 60-70 ℃, and the concentration of ferrous chloride is controlled to be less than or equal to 100g/L; 5) Hot galvanizing, namely cleaning the surface of the steel wire before galvanizing, controlling the zinc temperature to be within the range of 450-460 ℃ after entering a zinc pot, wiping uniformly by an air knife, and enabling the surface of a zinc layer to be smooth; 6) After zinc plating, the steel wire is immersed into a low-concentration phosphating tank for microphosphorylation, the total acidity is 50-60 Pt, the free acid is 3-4 Pt, the temperature is 50-60 ℃, a layer of thin phosphating film is formed on the surface of the steel wire after the plating by microphosphorylation, and the weight of the phosphating film is 2-4 g/m 2 ; 7) And (3) drawing the finished product by a wire drawing machine, wherein the wire drawing machine adopts 11-12 passes, the single-pass compression rate of the first pass is controlled to be 15% -17%, the total compression rate is controlled to be 85% -92%, the average compression rate of all passes is controlled to be 16% -18%, the wire drawing die of the last three passes is a special wire drawing die, the bearing length d is less than or equal to 0.6mm, the working cone angle is 8-9 degrees, and the special wire drawing powder for drawing after plating is used, so that the zinc layer is prevented from heating and falling in the drawing process.
2. 2. The steel wire produced by the production process of the 95MnNbA steel wire for the ultra-high-strength traction rope according to claim 1, wherein the diameter of the 95MnNbA steel wire for the ultra-high-strength traction rope is 0.5-0.8 mm, and the tensile strength is 2160-2260 MPa.

Description

Production process of 95MnNbA steel wire for ultrahigh-strength traction rope Technical Field The invention belongs to the technical field of wire rod production, and particularly relates to a production process of a 95MnNbA steel wire for an ultra-high-strength traction rope. Background The rope diameter of the steel wire rope for traction is thinner and thinner, but the strength is continuously improved, so that the steel wire is required to meet the requirement of ultra-high strength, the production of the steel wire is continuously developed towards the ultra-high strength direction, and the steel wire rope also has good anti-fatigue and corrosion resistance. At present, a domestic ultra-fine diameter steel wire used for a galvanized steel wire rope for 2260 MPa-level traction with the diameter of 18mm is 0.55mm, a traditional drawing mode adopts a water tank wire drawing machine to carry out wet drawing production, the production efficiency is low, the drawing passes are more, the production efficiency is low, meanwhile, the zinc layer is greatly lost due to multi-pass drawing in a plating-before-drawing mode, and the zinc weight is lower. Disclosure of Invention The invention aims to solve the technical problem of providing a production process of a 95MnNbA steel wire for an ultra-high strength traction rope, which has good steel wire performance and small loss of strength, zinc weight and toughness. In order to achieve the above purpose, the invention adopts the following technical scheme: The production process of the 95MnNbA steel wire for the ultra-high strength traction rope comprises the following specific steps: 1) The raw material is 95MnNbA steel wire rods, and the mass percentage of the chemical components is 0.95-1.0% of C, 0.30-0.33% of Si, 0.79-0.82% of Mn and 0.02-0.03% of Nb; 2) Drawing the semi-finished product, namely circularly water-cooling a wire drawing machine winding drum and a die box in the drawing process, wherein the water-cooling inlet temperature is less than 20 ℃, the die temperature is controlled to be less than 90 ℃, wire drawing powder is sufficient, and lubrication is ensured to be sufficient; 3) Heat treatment, namely ensuring that the wire temperature is within the range of 935-945 ℃, DV value is 35-45 mm m/min, lead bath temperature is kept within the range of 550-560 ℃, slag formation at front and rear outlets of the lead bath is avoided, lead hanging is avoided on the surface of a steel wire, and the sorbite rate obtained in the steel wire is more than 95%; 4) Pickling the steel wire after heat treatment, wherein the concentration of hydrochloric acid in pickling is 170-200 g/L, the temperature of hot water washing after pickling is 60-70 ℃, and the concentration of ferrous chloride is controlled to be less than or equal to 100g/L; 5) Hot galvanizing, namely cleaning the surface of the steel wire before galvanizing, controlling the zinc temperature to be within the range of 450-460 ℃ after entering a zinc pot, wiping uniformly by an air knife, and enabling the surface of a zinc layer to be smooth; 6) After zinc plating, the steel wire is immersed into a low-concentration phosphating tank for microphosphorylation, the total acidity is 50-60 Pt, the free acid is 3-4 Pt, the temperature is 50-60 ℃, a layer of thin phosphating film is formed on the surface of the steel wire after the plating by microphosphorylation, and the weight of the phosphating film is 2-4 g/m 2; 7) And (3) drawing the finished product by a wire drawing machine, wherein the wire drawing machine adopts 11-12 passes, the single-pass compression rate of the first pass is controlled to be 15% -17%, the total compression rate is controlled to be 85% -92%, the average compression rate of all passes is controlled to be 16% -18%, the wire drawing die of the last three passes is a special wire drawing die, the bearing length d is less than or equal to 0.6mm, the working cone angle is 8-9 degrees, and the special wire drawing powder for drawing after plating is used, so that the zinc layer is prevented from heating and falling in the drawing process. The diameter of the 95MnNbA steel wire for the ultra-high strength traction rope is 0.5-0.8 mm, and the tensile strength is 2160-2260 MPa. Compared with the prior art, the invention has the beneficial effects that: 1. The invention utilizes the high-quality 95MnNbA steel wire rod to produce the steel wire for the ultra-high strength traction rope, the wire rod characteristics ensure that the strength and the hardness of the drawn steel wire meet the wire requirement of the traction rope, niobium elements in the wire rod can refine austenite and pearlite grains, the finer the grains are, the more grain boundaries are, the strength and the toughness of the steel wire are synchronously improved, and meanwhile, the plasticity and the drawing performance are improved. 2. The temperature of the die is controlled to be lower than 90 ℃, and the temperature of the dra