CN105506460A - Steel wire rod for outer wire of hoisting steel wire rope of elevator - Google Patents

Abstract

The invention discloses a steel wire rod for an outer wire of a hoisting steel wire rope of an elevator. The steel wire rod comprises 0.48 to 0.51% of C, 0.15 to 0.30% of Si, 0.40 to 0.60% of Mn, no more than 0.015% of P, no more than 0.010% of S, 0.0020 to 0.0030% of total oxygen, 0.0030 to 0.0040% of N and no more than 0.10% of unavoidable impurities, with the balance being Fe.

Description

The outer silk wire rod of a kind of elevator dragging wire rope and production method thereof

Technical field

The invention belongs to retrofit wire rod product, relate to the outer silk wire rod of a kind of elevator dragging wire rope and production method thereof.

Background technology

Elevator can be divided into traction-type driving, hydraulic drive, pressure to drive the mode such as (reel driving), wheel chain, screw drive by type of drive, wherein tractive driving is main type of drive, account for more than 80%, be most widely used, its drives structure is primarily of traction machine (electric motor, stopper, traction wheel tissue) and wireline composition, steel wire hang on the traction sheave, one end suspension craning cab, the other end suspention counter weight device, using traction machine as propulsion source, produce traction by the friction between wireline and traction wheel and drive cage operation.

Elevator wire rope is the vitals of elevator, subject the weight of car and counterweight, the transmission of power relying on the frictional force between itself and traction wheel grooving to be produced by traction machine is to car and drive it to move up and down, in running process of elevator, traction steel-cable is around traction wheel, guide deflection sheave or diversion sheave do two-way to-and-fro movement, wireline needs to bear unidirectional or two-way stress in bending in the process, wearing and tearing are cause wireline inner wire major cause of failure with tired compound action, therefore require that elevator dragging wire rope will have higher intensity, fatigue lifetime and wear resistance.

Elevator dragging wire rope mainly contains two kinds, and the first is single intensity wireline, and namely the outer silk of wireline outer layer strand is identical with internal layer silk intensity rank, single grade of steel, single intensity, and intensity is generally 1570MPa, 1770MPa; The second is dual intensity wireline, and namely the outer silk of wireline outer layer strand is lower than internal layer silk intensity, two grade of steel, dual intensity, and outer silk intensity is generally 1370MPa, and internal layer silk intensity is generally 1770MPa.Good elevator ropes production technique is two grade of steel dual intensity production technique, import elevator dragging wire rope is all two grade of steel dual intensity wireline, the elevator ropes overwhelming majority of elevator manufacturer actual subscription is also dual intensity wireline, dual intensity elevator wire rope is selected to be that hardness also can be lower when its intensity is less because of outer silk, when there is friction between wireline and traction wheel, first be subject to being wireline compared with heavy wear, the work-ing life of traction wheel can be ensured like this, and the fracture of wire that wireline causes with tired compound action because of wearing and tearing, the probability occurring in the outer silk of outer layer strand is greater than internal layer silk, be convenient to the potential safety hazard finding that wireline exists like this, be conducive to observing elevator ropes damaged condition and more renewing wireline in time, the outer snappiness of silk of elevator ropes and the intensity of ectonexine silk are also the keys in elevator ropes work-ing life simultaneously.

Current Wire Rope Production factory generally adopts structural carbon steel (grade of steel is 45#, 55#, 60# and 65# etc.) to produce elevator dragging wire rope, can not meet the requirement of elevator dragging wire rope production to raw material far away.

Summary of the invention

Technical problem to be solved by this invention is the above-mentioned various defect overcome existing for prior art, provides the outer silk wire rod of a kind of elevator dragging wire rope and production method thereof.In order to develop the outer silk wire rod of elevator dragging wire rope, patent of the present invention is by wire rod Composition Design and smelt and rolling technology design, define the production technique of the outer silk wire rod of a kind of elevator dragging wire rope, meet the requirement of the outer silk production of elevator dragging wire rope to wire rod.

The feature of technical solution of the present invention is: by controlling carbon and manganese content, for control steel wire final strength and hardness lay the foundation; Controlling non-metallic inclusion in wire rod, the existence of serious non-metallic inclusion by controlling wire rod P, S, O constituent content and refinery practice, not only reducing the cold-forming property of wire rod, and greatly reduce steel wire fatigue lifetime as tired source; Improving purity of steel by controlling N element content, improving wire rod drawing property, improving the fatigue lifetime of steel wire; By controlling wire rod roller repairing, improve the structure and properties of wire rod.

For achieving the above object, the present invention takes following technical scheme:

The outer silk wire rod of a kind of elevator dragging wire rope, its chemical composition is by weight percentage: [C]: 0.48% ~ 0.51%, [Si]: 0.15% ~ 0.30%, [Mn]: 0.40% ~ 0.60%, [P]≤0.015%, [S]≤0.010%, total oxygen: 0.0020%-0.0030%, [N]: 0.0030%-0.0040%, inevitable impurity is not higher than 0.10%, and all the other are iron.

The range set reason of these compositions is as described below.

Carbon is the main strengthening element in steel, determine the final intensity of steel wire and hardness, carbon content scope causes greatly the intensity of steel wire, hardness fluctuations scope large, and therefore carbon range is the smaller the better, so to produce in outer silk wire rod carbon content control at 0.48%-0.51%.

Silicon is the main deoxidant element of smelting process.The low steel liquid deoxidation that will cause of silicone content is not enough; But it is thick that too high silicone content causes residual oxide in steel to be mingled with, unfavorable to the application performance of steel.Therefore, in steel, silicone content controls 0.15% ~ 0.30%.

Manganese is also a kind of element improving wire rod intensity, Mn content also has considerable influence to steel wire final strength and hardness, therefore, in the outer silk wire rod composition of design, control Fe content and fluctuation range in wire rod, therefore in steel, Fe content controls 0.40% ~ 0.60%.

Phosphorus, sulphur are all detrimental impurity elements in steel, require wire rod [P]≤0.015%, [S]≤0.010%, when not causing other influences, more low better.

Total oxygen content in wire rod is the important indicator representing wire rod cleanliness factor.Lower wire rod total oxygen content is easy to the processing characteristics improving wire rod.But too low wire rod oxygen level is unfavorable for the improvement of inclusion deformability in wire rod, and therefore the total oxygen content of wire rod controls at 0.0020%-0.0030%.

In steel, N content directly affects steel, and N content height not only can reduce the plasticity of wire rod, and can reduce the fatigue property of steel wire, and therefore in steel, [N] content controls at 0.0030%-0.0040%.

The outer silk Production method for wire rod of elevator dragging wire rope of the present invention is as follows:

1) hot metal pretreatment, converter smelting: molten iron carries out desulfurization pre-treatment, sulphur content in molten iron is controlled to less than 0.005%, preferably controls to less than 0.002%, converter adopts double slag process to smelt slag-stopping tapping, reduce molten steel phosphorus content, converter smelting endpoint requires [P]≤0.010%.

2) LF refining: LF stove adopts high alkalinity wash heat refinery practice, adopts silicon barium composite deoxidant in LF stove refining process, the barium in reductor except deoxidation also with the SiO in steel ₂and Al ₂o ₃generation macrobead is mingled with, refining time controls at 60-120 minute, ensure that macrobead is mixed in refining process and fully floats along with Argon, significantly can reduce and endanger to wireline the rank that maximum B, D class is mingled with, LF refinery practice temperature controls within the scope of 1530 DEG C-1590 DEG C.

3) continuous casting: adopt the bloom continuous casting of cross dimensions (200-400mm) * (300-500mm) to produce steel billet, be not more than 30 DEG C in casting process Metal in Tundish superheating temperature, pulling rate is between 0.5m/min-0.7m/min.

4) rod rolling: wire rod diameter Φ 6.5-Φ 8.0mm, wire rod laying temperature 880-900 DEG C, roller table speed 0.7-0.9m/s, blower fan revolution 800-1200r/min.

According to the outer silk wire rod related in the present invention and production method thereof, the outer silk intensity of Φ 10mm elevator dragging wire rope Φ 0.7mm that the Φ 6.5mm wire rod produced by the method is produced reaches 1370MPa, number of torsions is greater than 34 times, be greater than 400,000 fatigue lifetime, meet the requirement of the outer silk production of elevator dragging wire rope to wire rod.

Embodiment

Be described in more detail the present invention by embodiment below, these embodiments are only the descriptions to best mode for carrying out the invention, do not have any restriction to scope of the present invention.

Claims (2)

1. the outer silk wire rod of elevator dragging wire rope, it is characterized in that chemical composition is by weight percentage: [C]: 0.48% ~ 0.51%, [Si]: 0.15% ~ 0.30%, [Mn]: 0.40% ~ 0.60%, [P]≤0.015%, [S]≤0.010%, total oxygen: 0.0020%-0.0030%, [N]: 0.0030%-0.0040%, inevitable impurity is not higher than 0.10%, and all the other are iron.

2. the outer silk Production method for wire rod of elevator dragging wire rope according to claim 1, is characterized in that comprising the steps:

1) hot metal pretreatment, converter smelting: molten iron carries out desulfurization pre-treatment, controls to less than 0.005% by the sulphur content in molten iron, and converter adopts double slag process to smelt slag-stopping tapping, and converter smelting endpoint requires [P]≤0.010%;

2) LF refining: LF stove adopts high alkalinity wash heat refinery practice, and adopt silicon barium composite deoxidant in LF stove refining process, refining time controls to control within the scope of 1530 DEG C-1590 DEG C in 60-120 minute, LF refinery practice temperature;

3) continuous casting: adopt the bloom continuous casting of cross dimensions (200-400mm) * (300-500mm) to produce steel billet, be not more than 30 DEG C in casting process Metal in Tundish superheating temperature, pulling rate is between 0.5m/min-0.7m/min;

4) rod rolling: wire rod diameter Φ 6.5-Φ 8.0mm, wire rod laying temperature 880-900 DEG C, roller table speed 0.7-0.9m/s, blower fan revolution 800-1200r/min.