CN103273287A - Method for producing heavy rails - Google Patents

Abstract

The invention provides a method for producing heavy rails. The method includes the steps that a converter is adopted for smelting, and H is controlled to be less than or equal to 1.2PPm in molten steel; blank casting is conducted, and throwing is conducted with the fixed throwing speed selected in the range from 0.4m-1.1m per minute; casting blank is heated in a heat accumulating type heater; rolling, cooling and other follow-up procedures are conducted normally. The production method not only meets requirements for mechanical properties, but also enables the procedures to be relatively simple, energy consumption is low, production cost of every ton of steel is reduced by at least 2.5%, and namely cost performance is high. In addition, burning loss quantity is not greater than 1.2%, safety requirements of passenger traffic railways are met, and the production method is easy to popularize and implement.

Description

A kind of production method of heavy rail

Technical field

The present invention relates to a kind of production method of rail, belong to a kind of production method of heavy rail particularly.

Background technology

Along with the appearance of problems such as global economy high speed development and climate warming, energy crisis, financial crisis, " energy-saving and emission-reduction, recycling economy and low-carbon economy " become the scientific development theme of advocating in the whole world.For this reason, how to reduce the Heavy-rail Production cost become one of the problem that must consider.

Railway is as the high-tech product that adapts to modern civilization and social progress, be at full speed, heavy, low pollute,, safe and reliable celebrated advanced person's the vehicles, therefore, its employing will reduce the cost of communications and transportation greatly, have the huge social economic benefit.The rail that uses on the railway requires macrostructure not allow white point and shrinkage cavity owing to the consideration from security on the inherent quality, web of the rail center striped and segregation have also been carried out clearly regulation, does not allow the thread defect greater than 0.3mm on surface quality.

According to update search, non-hundred meters common technological process of productions of heavy rail of record are in " development of Wuhan Iron and Steel Plant Rail Production technology " paper that " Wuhan Iron and Steel Plant technology " delivered: converter smelting-continuous casting-roughing-finish rolling-sawing, printing-slow cooling-aligning-saw bore processing-rail-head quenching-inspection-warehouse-in.For satisfying the requirement of modern railways, in hundred meters Heavy-rail Production, carry out the surface quality inspection after all adopting the strand slow cooling at present, reentering heating furnace after qualified heats, and it is heated to about 1300 ℃ from room temperature, after be rolled into hundred meters long heavy rails again.Above production technology is the batch production mode, causes that not only operation is many, and main is production cycle long (having 24 hours slow cooling time at least), the energy resource consumption height, and the unit operation rate is low.

Summary of the invention

The objective of the invention is to overcome the deficiency that prior art exists, provide a kind of not only mechanical property to meet the demands, can also make operation simple relatively, energy consumption is low, the production method of the heavy rail of ton steel production cost reduction at least 2.5%.

Realize the measure of above-mentioned purpose:

A kind of production method of heavy rail the steps include:

1) adopts converter smelting, H≤1.2PPm in the control molten steel;

2) carrying out strand, is to select one as fixedly carrying out throwing in 0.4 ~ 1.1 meter/minute at casting speed;

3) in storage heater strand is heated, control strand charging temperature is being no more than in 150 minutes at 200 ~ 920 ℃, and strand is heated to 1100 ~ 1200 ℃;

4) according to routine be rolled, back operation such as cooling.

The present invention compared with prior art, not only mechanical property meets the demands, and can also make operation simple relatively, energy consumption is low, and ton steel production cost reduces at least 2.5%, i.e. the cost performance height, and the scaling loss amount drops to and is no more than 1.2%, has satisfied the passenger rail safety requirements, is easy to promotion and implementation.

The specific embodiment

Below the present invention is described in detail:

Speed per hour≤350km the Rail for railway of embodiment for producing.

Table 1 is the main production value tabulation of various embodiments of the present invention and Comparative Examples;

Table 2 is the mechanical property of various embodiments of the present invention and Comparative Examples and energy consumption, the tabulation of cost testing result.

A kind of production method of heavy rail the steps include:

1) adopts converter smelting, H≤1.2PPm in the control molten steel;

2) carrying out strand, is to select one as fixedly carrying out throwing in 0.4 ~ 1.1 meter/minute at casting speed;

3) in storage heater strand is heated, control strand charging temperature is being no more than in 150 minutes at 200 ~ 920 ℃, and strand is heated to 1100 ~ 1200 ℃;

4) according to routine be rolled, back operation such as cooling.

Table 1: various embodiments of the present invention and the tabulation of Comparative Examples main technologic parameters

The mechanical property of each embodiment of table 2 and Comparative Examples and energy consumption, the tabulation of cost testing result

As can be seen from Table 2, the heavy rail that the present invention produces not only mechanical property meets the demands, and does not have white point, shrinkage cavity all≤0.5, and energy consumption per ton steel has descended 30 GJ/ hours at least, and ton steel production cost reduces more than 2.5% yuan at least, and the scaling loss amount is up to 1.1%.

Above-described embodiment only exemplifies for the best, and is not to be restriction to embodiments of the present invention.

Claims (1)

1. the production method of a heavy rail the steps include:

1) adopts converter smelting, H≤1.2PPm in the control molten steel;

2) carrying out strand, is to select one as fixedly carrying out throwing in 0.4 ~ 1.1 meter/minute at casting speed;

3) in storage heater strand is heated, control strand charging temperature is being no more than in 150 minutes at 200 ~ 920 ℃, and strand is heated to 1100 ~ 1200 ℃;

4) according to routine be rolled, back operation such as cooling.