Online softening rolling method for medium carbon alloy cold forging steel

A technology of cold heading steel and carbon alloy, which is applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., which can solve the problems of increasing the chance of decarburization on the surface of steel wire, low section shrinkage, and high production cost, so as to reduce spheroidization Improvement of annealing time, reduction of area, and cost saving of deep processing

Inactive Publication Date: 2007-10-03
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are that the strength and hardness of the wire are high, the reduction of area is low, the spheroidizing annealing process is complicated, the processing time is long, the energy consumption is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The steel mill refines qualified molten steel and continuously casts it into 140 square billets. The chemical composition is C: 0.35%, Si: 0.18%, Mn: 0.68%, P: 0.015%, S: 0.006%, Cr: 1.0%, Mo: 0.18% ; The steel billet in the wire rod factory is reheated to 1150°C, first rolled by the primary, intermediate and pre-finishing rolling units, and then cooled by controlled water, the rolled piece is finished rolled at 765°C in the finishing rolling unit to form a Φ8mm wire rod, and the deformation reduction rate is 54.5%, deformation rate 1 / 20s, after finishing rolling, the rolled piece is water-cooled to 750°C and exits the laying machine, after spinning, the loose coil is slowly cooled at a cooling rate of 0.2°C / s for 1200 seconds, and the wire is naturally cooled to room temperature and bundled . The chemical composition of the medium carbon alloy cold heading steel is listed in Table 1, the process parameters are listed in Table 2, and the mechanical properties of the mat...

Embodiment 2

[0013] The steel mill refines qualified molten steel and continuously casts it into 140 square billets. The chemical composition is C: 0.34%, Si: 0.20%, Mn: 0.65%, P: 0.011%, S: 0.005%, Cr: 0.9%, Mo: 0.19% ; The steel billet in the wire rod factory is reheated to 1100°C, first rolled by the primary, intermediate and pre-finishing rolling units, and then cooled by controlled water, the rolled piece is finished rolled at 750°C in the finishing rolling unit to form a Φ10mm wire rod, and the deformation reduction rate is 56.6%, deformation rate 1 / 20s, after finishing rolling, the rolled piece is water-cooled to 720°C and exits the laying machine, after spinning, the loose coil is slowly cooled at a cooling rate of 0.25°C / s for 1000 seconds, and the wire is naturally cooled to room temperature and bundled . The chemical composition of the medium carbon alloy cold heading steel is listed in Table 1, the process parameters are listed in Table 2, and the mechanical properties of the m...

Embodiment 3

[0015] The steel mill refines qualified molten steel and continuously casts it into 140 square billets. The chemical composition is C: 0.36%, Si: 0.19%, Mn: 0.63%, P: 0.019%, S: 0.004%, Cr: 1.01%, Mo: 0.19% ; The steel billet in the wire rod factory is reheated to 1180°C, first rolled by the primary, intermediate and pre-finishing rolling units, and then cooled by controlled water, the rolled piece is finished rolled at 800°C in the finishing rolling unit to form a Φ12mm wire rod, and the deformation reduction rate is 58.2%, deformation rate 1 / 20s, after finishing rolling, the rolled piece is water-cooled to 760°C and exits the laying machine, after spinning, the loose coil is slowly cooled at a cooling rate of 0.3°C / s for 900 seconds, and the wire is naturally cooled to room temperature and bundled . The chemical composition of the medium carbon alloy cold heading steel is listed in Table 1, the process parameters are listed in Table 2, and the mechanical properties of the ma...

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PUM

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Abstract

An in-line softening and rolling technology for the cold-foraged medium-carbon alloy steel features use of high-speed wire rolling mill and includes such steps as heating billet to 950-1180 deg.C, primary, medium and pre-fine rollings, cooling to 700-820 deg.C by water tank, fine rolling, water cooling to 680-780 deg.C, discharging wire, cooling at the cooling speed of 0.01-0.5 deg.C/S for 600-2400 S, and natural cooling. Its advantages are high speed and product quality and saving energy.

Description

technical field [0001] The invention belongs to metal wire rod rolling, in particular to a continuous rolling method for medium carbon alloy cold heading steel. Background technique [0002] The metal fasteners used now, especially the fasteners below M24, are widely formed by cold heading steel wire rod cold heading. At present, medium-carbon alloy cold heading steel wire rods with a carbon equivalent of 0.35% to 0.55% are commonly used. This wire rod rolling method is to heat the billet to 1000-1150°C for initial rolling, intermediate rolling and pre-finish rolling, then finish rolling above 950°C, and slow cooling after rolling. This rolling process is carried out in the austenite rejunction temperature zone. The metallographic structure of the produced wire is ferrite + pearlite + bainite / martensite. The strength and hardness of the wire are high, and the reduction of area is high. Low, it is not suitable to make fasteners directly by cold heading. Therefore, when manu...

Claims

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Application Information

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IPC IPC(8): B21B1/16B21B37/00B21B45/02C22C38/22
Inventor 王卫东胡孝三于同仁华刚孙维许健宋强张步海
Owner MAANSHAN IRON & STEEL CO LTD
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