CN103316930A

CN103316930A - Cooling control method of wire rod for cold forging steel

Info

Publication number: CN103316930A
Application number: CN2013102302586A
Authority: CN
Inventors: 孙浩; 任玉辉; 白喜峰; 韩立涛; 孙文东; 兴丽; 杨迎强; 李凯; 车安; 张欢
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2013-06-11
Filing date: 2013-06-11
Publication date: 2013-09-25

Abstract

The invention provides a cooling control method of a wire rod for cold forging steel. The cooling control method includes that the wire rod for cold forging steel with 5.5mm circle diameter is produced through processes of rough rolling, medium rolling, pre-finish rolling, finish rolling, double-module rolling and spinning, and forced cooling is performed by controlling the roller way speed, fan motor frequency and water tank water volume; the finish rolling temperature of pre-finish rolling is at 955+/-15 DEG C; the start rolling temperature of finish rolling is at 880+/-20 DEG C; the start rolling temperature of double-module rolling is at 870+/-10 DEG C; the temperature of a spinning machine is at 860+/-10 DEG C. The rolling speed of a 1# rough rolling machine is controlled to be 0.48-0.50 m/s, the rolling speed of a 5# rough rolling machine is controlled to be 0.67-0.69 m/s, and the rolling speed of a double-module rolling machine finished machine frame is controlled to be 104-105m/s. The tensile strength of products can be controlled between 698-719 MPa, and the fluctuation range can be controlled to be 21 MPa. Compared with the prior art, the fluctuation range is obviously reduced, accordingly the process adjustment times in the use process of users are greatly reduced, control difficulty of the production process is reduced for the users, and user requirements are met.

Description

A kind of cold-forging steel controlled cooling method of wire rod

Technical field

The invention belongs to the steel rolling process field, relate in particular to a kind of wire rolling plants and produce the control cooling means that 8.8 grades of cold-forging steels are used wire rod.

Background technology

Determined by cold-forging steel post-production and handling characteristics, the domestic user not only has strict demand to the tensile strength of SWRCH35K carbon element the cold heading steel, and for the fluctuation range of tensile strength certain limitation is also arranged.But consider the present situation of domestic equipment and technology condition, so the fluctuation range of the tensile strength of General Requirements SWRCH35K carbon element the cold heading steel is controlled between the 55-80MPa.Because the tensile strength fluctuation range is larger, thereby the user is in use, need frequent adjusting process, both strengthened the difficulty of user's production process control, directly affected user's production cost simultaneously.

Summary of the invention

Purpose of the present invention aims to provide a kind of tensile strength and satisfies user's needs fully, and the tensile strength fluctuation range is used the controlled cooling method of wire rod with 8.8 grades of interior cold-forging steels at 25MPa.

For this reason, the technical solution taked of the present invention is:

A kind of cold-forging steel is with the controlled cooling method of wire rod, adopt roughing-in roll-pre-finish rolling-finish rolling-Dual module is rolling-explained hereafter of weaving silk ￠ 5.5mm cold-forging steel wire rod, its concrete technology is:

1, roller table speed:

1 section is 0.75m/s; 2 sections～18 sections begin to increase progressively piecemeal with the speed of 0.01m/s from 0.75m/s, increase to 0.91m/s to 18 sections; 19 sections is 0.72m/s.

2, blower motor frequency:

1#～8# blower motor frequency is 0; 9#～10# blower motor frequency is 800Hz; 11#～18# blower motor frequency is 0.

3, water volume in water tank:

1# water tank 30～40 m ³, 2# water tank 19～21 m ³, 3# water tank 24～26m ³, 4# water tank 24～26m ³, 5# water tank 14～16m ³

4, rolling temperature:

955 ± 15 ℃ of pre-finish rolling finishing temperatures; 880 ± 20 ℃ of finish rolling start rolling temperatures; 870 ± 10 ℃ of Dual module start rolling temperatures; Go out 860 ± 10 ℃ of Laying head temperature.

5, mill speed:

1# roughing mill 0.48～0.50m/s; 5# roughing mill 0.67～0.69m/s; Dual module milling train finished frame 104～105m/s.

Beneficial effect of the present invention is:

Because the present invention adopted Forced water cooling technique, so product tensile strength can be controlled between the 698-719 MPa, and fluctuation range is 21MPa.Compared with the prior art, its fluctuation range obviously descends, and adjusts number of times thereby greatly reduce user's technique in use, reduces the difficulty of user's production process control, has satisfied user's request.

The specific embodiment

Embodiment 1:

Adopt roughing-in roll-pre-finish rolling-finish rolling-Dual module is rolling-explained hereafter of weaving silk ￠ 5.5mm, steel grade SWRCH35K cold-forging steel wire rod, its concrete technology is:

1, roller table speed control:

1 section is 0.75m/s; 2 sections～18 sections are respectively 0.75m/s, 0.76 m/s, 0.77 m/s, 0.78 m/s, 0.79 m/s, 0.80 m/s, 0.81 m/s, 0.82 m/s, 0.83 m/s, 0.84 m/s, 0.85 m/s, 0.86 m/s, 0.87 m/s, 0.88 m/s, 0.89 m/s, 0.90 m/s, 0.91 m/s, and 19 sections are controlled at 0.72m/s.

2, blower motor FREQUENCY CONTROL:

1#～8# blower motor frequency is 0; 9#～10# blower motor frequency all is controlled at 800Hz; 11#～18# blower motor frequency is 0.

3, water volume in water tank control:

1# water tank 30 m ³, 2# water tank 20 m ³, 3# water tank 24 m ³, 4# water tank 25m ³, 5# water tank 16m ³

4, rolling temperature control:

945 ℃ of pre-finish rolling finishing temperatures; 870 ℃ of finish rolling start rolling temperatures; 860 ℃ of Dual module start rolling temperatures; Go out 850 ℃ of Laying head temperature.

5, mill speed control:

1# roughing mill 0.48m/s; 5# roughing mill 0.67m/s; Dual module milling train finished frame 105 m/s.

Embodiment 2:

1, roller table speed control:

2, blower motor FREQUENCY CONTROL:

3, water volume in water tank control:

1# water tank 40 m ³, 2# water tank 21 m ³, 3# water tank 26m ³, 4# water tank 24m ³, 5# water tank 14m ³

4, rolling temperature control:

970 ℃ of pre-finish rolling finishing temperatures; 900 ℃ of finish rolling start rolling temperatures; 880 ℃ of Dual module start rolling temperatures; Go out 870 ℃ of Laying head temperature.

5, mill speed control:

1# roughing mill 0.50m/s; 5# roughing mill 0.68m/s; Dual module milling train finished frame 104 m/s.

Claims

1. a cold-forging steel is with the controlled cooling method of wire rod, adopt roughing-in roll-pre-finish rolling-finish rolling-Dual module is rolling-explained hereafter of weaving silk ￠ 5.5mm cold-forging steel wire rod, it is characterized in that, concrete technology is:

(1), roller table speed:

1 section is 0.75m/s; 2 sections～18 sections begin to increase progressively piecemeal with the speed of 0.01m/s from 0.75m/s, increase to 0.91m/s to 18 sections; 19 sections is 0.72m/s;

(2), blower motor frequency:

1#～8# blower motor frequency is 0; 9#～10# blower motor frequency is 800Hz; 11#～18# blower motor frequency is 0;

(3), water volume in water tank:

(4), rolling temperature:

955 ± 15 ℃ of pre-finish rolling finishing temperatures; 880 ± 20 ℃ of finish rolling start rolling temperatures; 870 ± 10 ℃ of Dual module start rolling temperatures; Go out 860 ± 10 ℃ of Laying head temperature;

(5), mill speed:

1# roughing mill 0.48～0.50m/s; 5# roughing mill 0.67～0.69m/s; Dual module milling train finished frame 104～105 m/s.