CN103599925A

CN103599925A - Steel rail rolling method

Info

Publication number: CN103599925A
Application number: CN201310659513.9A
Authority: CN
Inventors: 王代文; 马朝辉; 王彦忠; 冯伟; 张学斌; 贾济海
Original assignee: Pangang Group Panzhihua Steel and Vanadium Co Ltd
Current assignee: Pangang Group Panzhihua Steel and Vanadium Co Ltd
Priority date: 2013-12-09
Filing date: 2013-12-09
Publication date: 2014-02-26

Abstract

The invention relates to the field of steel rail rolling, and particularly relates to a steel rail rolling method. The rolling method can be used for efficiently rolling 60AT2(60D40) steel rails, and comprises the following steps: heating a rectangular continuous cast billet to 1200 DEG C by a heating furnace, descaling by high pressure water, conveying the billet to a first cogging mill and a second cogging mill for rolling, and then sequentially conveying the billet to a universal roughing mill, a universal intermediate mill unit and a universal finishing mill for rolling. The simplified rolling method with high efficiency can be used for rolling and producing 60AT2(60D40) steel rails which can serve as turnout materials.

Description

Steel rail rolling method

Technical field

The present invention relates to steel rail rolling field, especially a kind of steel rail rolling method.

Background technology

Along with China railways is to high speed, heavily loaded future development, high-speed rail technology has obtained important breakthrough, and supporting turnout technology has also been obtained breakthrough with it, the track switch that domestic each large bridge is successively developed different model.As make track switch raw material---60AT2 (60D40) rail, has specific specification requirement.For making this specific 60AT2 (60D40) although rail demand is large, to making the method for this kind of rail, there is no record at present.

Summary of the invention

Technical problem to be solved by this invention is to provide the method for a kind of efficient rolling 60AT2 (60D40) rail.

The technical solution adopted for the present invention to solve the technical problems is: steel rail rolling method, comprises the steps:

(1) by heating furnace, continuous cast rectangle billet is heated to 1200 ℃, after high-pressure water descaling, is sent to the rolling of first blooming mill, wherein in first blooming mill, be provided with 2 to 4 hat holes, and described first blooming mill rolling number of times is 5 to 9 passages;

(2) second blooming mill rolling is sent to after strand is rolled into hat rolled piece in the hat hole of first blooming mill, and wherein the rail shape hole count of second blooming mill is 3 to 6, and described second blooming mill rolling number of times is 3 to 5 passages;

The rail shape hole of (3) second blooming mills is rolled into rail blank by carrying out water under high pressure or high-pressure blast de-scaling by strand, is then delivered to universal roughing mill rolling, and wherein rail short-leg end is below steel rail rolling line;

(4) after universal roughing mill group rolling 3 passages, carry out high-pressure blast de-scaling, then deliver to omnipotent intermediate mill rolling 1 passage, wherein rail short-leg end is below steel rail rolling line.

(5) after omnipotent intermediate mill rolling 1 passage, deliver to after rolling completes and send universal finishing mill rolling 1 passage, wherein rail short-leg end is below steel rail rolling line.

Further, the gradient scope of the universal roughing mill rail head edger roll in step (3) is 0-3.0%.

Further, in step (4), the gradient scope of omnipotent intermediate mill rail head edger roll is 1.6%-2.5%.

The invention has the beneficial effects as follows: during fabrication, according to the operation of rolling, continuous cast rectangle billet is heated to 1200 ℃ and de-scaling, then carries out rolling for the first time, form basic hat rolled piece; Then carry out rolling for the second time above-mentioned hat rolled piece is rolled out to rail blank, and with water under high pressure and high-pressure blast de-scaling, above-mentioned two step rollings are in order to form the basic profile of rail, and provide semi-finished product for the rolling of later stage blooming mill.Subsequently, the above-mentioned semi-finished product with rail blank are successively by the rolling of universal roughing mill group, omnipotent intermediate mill rolling and universal finishing mill rolling, and finally form the finished product shape of rail.This milling method is simplified and efficiently, can be applied in the production of rolling as 60AT2 (60D40) rail of track switch raw material.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the rail finished product that obtains of this milling method.

Fig. 2 is the gradient schematic diagram of universal mill rail head edger roll in this milling method.

In figure, be labeled as: rail finished product 1, rail long leg end 11, rail short-leg end 12, steel rail rolling line 13, gradient α.

The specific embodiment

Below in conjunction with accompanying drawing, the present invention is further described.

Steel rail rolling method, comprises the steps:

The rail shape hole of (3) second blooming mills is rolled into rail blank by carrying out water under high pressure or high-pressure blast de-scaling by strand, is then delivered to universal roughing mill rolling, and wherein rail short-leg end 12 is below steel rail rolling line 13;

(4) after universal roughing mill group rolling 3 passages, carry out high-pressure blast de-scaling, then deliver to omnipotent intermediate mill rolling 1 passage, wherein rail short-leg end 12 is below steel rail rolling line 13;

(5) after omnipotent intermediate mill rolling 1 passage, deliver to after rolling completes and send universal finishing mill rolling 1 passage, wherein rail short-leg end 12 is below steel rail rolling line 13.

In actual applications, the continuous cast rectangle billet of first-selected this specification of 380 * 280mm is rolled as rolling stock.2 to 4 hat holes are set in first blooming mill,, in order to complete faster, continuous cast rectangle billet is rolled into hat rolled piece, " hat " described here, the one end that is the continuous casting billet of " rectangle " is rolled into less termination, forming the little continuous casting billet shape in large one end, one end, is the first step that forms rail shape.And then described hat rolled piece is placed in the rail shape hole of second blooming mill, the rail shape hole by second blooming mill is rolled into rail blank by rolled piece, and the rail blank shape here just approaches the profile of rail finished product 1.

Then enter into the Rolling With Universal Mill stage, the described Rolling With Universal Mill stage need to be passed through the rolling of universal roughing mill, omnipotent middle milling train and universal finishing mill successively, and described universal mill is progressively final rail finished product 1 by the semi-finished product rolling with rail blank.

In actual rolling, as described in Figure 1, have a steel rail rolling line 13.When rolling section arrangement form is designed, generally select rail short-leg end 12 below steel rail rolling line 13, rail long leg end 11, above steel rail rolling line 13, can well guarantee the quality of product.

Because the head top surface of rail finished product 1 need to be provided with 1:40(2.5%) inclined-plane, in order to form such inclined-plane in the Rolling With Universal Mill stage, can select such scheme: the gradient α scope of the universal roughing mill rail head edger roll in step (3) is 0-3.0%.The gradient α span of edger roll is as shown in Figure 2 0-3.0%.

In order to reach above-mentioned technique effect, can select such scheme: in step (4), the gradient α scope of omnipotent intermediate mill rail head edger roll is 1.6%-2.5%.Gradient α shown in Fig. 2, also can refer to the gradient α of omnipotent intermediate mill rail head edger roll, and gradient α scope is 1.6%-2.5%.

Claims

1. steel rail rolling method, is characterized in that, comprises the steps:

The rail shape hole of (3) second blooming mills is rolled into rail blank by carrying out water under high pressure or high-pressure blast de-scaling by strand, is then delivered to universal roughing mill rolling, and wherein rail short-leg end (12) is in the below of steel rail rolling line (13);

(4) after universal roughing mill group rolling 3 passages, carry out high-pressure blast de-scaling, then deliver to omnipotent intermediate mill rolling 1 passage, wherein rail short-leg end (12) is in the below of steel rail rolling line (13);

(5) after omnipotent intermediate mill rolling 1 passage, deliver to after rolling completes and send universal finishing mill rolling 1 passage, wherein rail short-leg end (12) is in the below of steel rail rolling line (13).

2. steel rail rolling method as claimed in claim 1, comprises the steps: that gradient (α) scope of the universal roughing mill rail head edger roll in step (3) is 0-3.0%.

3. steel rail rolling method as claimed in claim 1 or 2, comprises the steps: that gradient (α) scope of omnipotent intermediate mill rail head edger roll in step (4) is 1.6%-2.5%.