Preparation method for improving production efficiency of high-temperature diffusion steel grade

Abstract

The invention provides a preparation method for improving the production efficiency of high-temperature diffusion steel. According to the method, the step pitch of a heating furnace is reduced by 40 mm, the total step number of the heating furnace is increased by 11, the temperature of a heating section I is adjusted to be 1050-1100 DEG C, the temperature of a heating section II is adjusted to be 1220-1270 DEG C, the temperature of a soaking section is adjusted to be 1220-1270 DEG C, and the rolling starting temperature is adjusted to be 1120-1170 DEG C. The steel charging number is increased after the step pitch of the heating furnace is optimized, the steel charging number of the heating furnace is increased from 98 to 109, the travel time of the high-temperature diffusion steel grade in the high-temperature section is prolonged, meanwhile, the high-temperature diffusion steel grade heating process is invented, the temperature holding time of the high-temperature diffusion steel grade in the high-temperature section is shortened, and the machine-hour yield of the high-temperature steel grade and the heating efficiency of the heating furnace are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel smelting, and in particular to a preparation method for improving the production efficiency of high-temperature diffusion steel grades. Background Art

[0002] At present, 98 steel bars can be loaded in the No. 1 high-speed wire heating furnace. When producing bearing steel, bridge cable steel, and free-cutting steel that require high-temperature diffusion, a long process waiting time is required. On average, 20-30 minutes of waiting time is required for every 42 minutes of stable production. This makes the average machine hourly output of these high-temperature diffusion steels only 58.33-67.75% of the normal capacity of the rolling line, which limits the production line capacity and increases production costs. Summary of the invention

[0003] The present invention aims to provide a preparation method for improving the production efficiency of high-temperature diffusion steel grades in order to solve the problems that traditional processes limit production line capacity and increase production costs.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a preparation method for improving the production efficiency of high-temperature diffusion steel grades, the method comprising: reducing the step distance of the heating furnace by 40 mm, increasing the total number of steps of the heating furnace by 11 steps, adjusting the temperature of the heating section I to 1050-1100°C, adjusting the temperature of the heating section II to 1220-1270°C, adjusting the temperature of the soaking section to 1220-1270°C, and adjusting the rolling temperature to 1120-1170°C.

[0005] Preferably, the blank is controlled to be heated in the heating section II and the soaking section for 60-70 minutes.

[0006] Compared with the prior art, the advantages and positive effects of the present invention are:

[0007] After optimizing the step distance of the heating furnace, the number of steel bars loaded was increased from 98 to 109, which increased the travel time of high-temperature diffusion steel in the high-temperature section. At the same time, a high-temperature diffusion steel heating process was invented, thereby reducing the waiting time of high-temperature diffusion steel in the high-temperature section and improving the machine hourly output of high-temperature steel and the heating efficiency of the heating furnace. DETAILED DESCRIPTION

[0008] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0009] Example 1

[0010] This embodiment provides a preparation method for improving the production efficiency of high-temperature diffusion steel, and the steps are: 180mm*240mm continuous casting billet → walking beam heating furnace → high-pressure water descaling → 1#-7# rough rolling → 1# flying shear → 8#-13# medium rolling → 2# flying shear → 14#-21# pre-finishing rolling → 1# water tank cooling → 3# flying shear → 22#-29# finishing rolling → 2# water tank cooling → 4# flying shear → 30#-33# sizing → 3# water tank cooling → spinning → air-cooled roller cooling → collection → bundling → weighing → hanging → storage. The heating process of the walking beam heating furnace is adjusted to a heating stage I temperature of 1050-1100℃, a heating stage II temperature of 1220-1270℃, a soaking stage temperature of 1220-1270℃, and a rolling start temperature of 1120-1170℃, wherein the total control time of the heating stage II and the soaking stage is 60-70min.

[0011] Further improvements include adjusting the step distance of the heating furnace from 400mm to 360mm, and increasing the total number of steps of a high-speed wire heating furnace from 98 to 109, with 3 steps added to the preheating section, 3 steps added to the first heating section, 3 steps added to the second heating section, and 2 steps added to the equalizing section, for a total of 11 steps.

[0012] After optimizing the heating furnace step, the number of steel bars increased from 98 to 109. At the same time, a heating process for high-temperature diffusion steel was invented, and the machine-hour output of high-temperature diffusion steel increased by 10.2%, which increased the production and reduced the cost of high-temperature diffusion steel. At the same time, the overall heating efficiency of the heating furnace was also improved, reducing the gas consumption per ton of steel. Before the optimization of the heating furnace step, the machine-hour output of 1# high-speed wire bearing steel was 85.1 tons / hour, the machine-hour output of bridge cable steel was 67.5 tons / hour, and the machine-hour output of free-cutting steel was 69.2 tons / hour. The heating furnace step and the heating process were optimized. After the thermal process optimization, the machine hourly output of the three steel grades increased to 93.8 tons / hour, 74.4 tons / hour and 76.3 tons / hour respectively; the monthly fixed cost of the 1# high-speed line was 6138290.2 yuan, the monthly average operation rate was 83%, and the hourly allocated fixed cost was 10271.57 yuan / hour; the fixed cost per ton of bearing steel, bridge cable steel and free-cutting steel decreased by 11.2 yuan / ton, 14.1 yuan / ton and 13.8 yuan / ton respectively; at the same time, the overall heating efficiency of the heating furnace was also improved, reducing the gas consumption by 8.22m 3 / t; The invention patent for the first application of 180mm×240mm cross-section to improve the production efficiency of high-temperature diffusion steel grades in China is an innovative technology in the field of process technology. It has been successfully applied in mass production and fully meets customer requirements.

[0013] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for improving the production efficiency of high-temperature diffusion steel, characterized in that: The method is as follows: the heating furnace step distance is reduced by 40 mm, the total number of heating furnace steps is increased by 11 steps, the temperature of heating section I is adjusted to 1050-1100°C, the temperature of heating section II is adjusted to 1220-1270°C, the temperature of the soaking section is adjusted to 1220-1270°C, and the rolling temperature is adjusted to 1120-1170°C.

2. The method for improving the production efficiency of high temperature diffusion steel according to claim 1, characterized in that: The blank is controlled to be heated in the heating section II and the soaking section for 60-70 minutes.