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Hot rolling heating method for low-carbon aluminum killed steel casting blank

A technology of low carbon aluminum killed steel and heating method, which is applied in the field of hot rolling and heating of low carbon aluminum killed steel casting billets, can solve the problems of reducing yield, oxidation burning loss, shortening life, etc., and achieves good surface quality and mechanical properties. Stable, uniformity-improving effect

Inactive Publication Date: 2011-02-09
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Cause a lot of energy (mainly fuel) waste
[0007] (2) Cause serious oxidation and burning loss, reduce the yield of finished products, and cause serious slag accumulation at the bottom of the furnace, shortening the operation period of the furnace
[0008] (3) It is more difficult to remove the oxide scale on the surface of the strip steel, which affects the product quality
[0009] (4) The refractory lining in the high-temperature zone of the heating furnace that has been subjected to high-temperature heat load for a long time is seriously peeled off, and the service life is shortened, which not only increases the maintenance cost, but also reduces the furnace operation rate

Method used

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  • Hot rolling heating method for low-carbon aluminum killed steel casting blank
  • Hot rolling heating method for low-carbon aluminum killed steel casting blank
  • Hot rolling heating method for low-carbon aluminum killed steel casting blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The hot-rolled steel coils are steel coils with a number of 1 to 6, the steel is St12, and its chemical composition is shown in Table 1. The rolling specification is 3.25×1050mm. ℃), the total heating time is 140-142min, and the furnace temperature and total heating time of the preheating section, heating section and soaking section are shown in Table 2. The rolling temperature is 868-887°C, and the properties of the finished product are shown in Table 3.

[0025] Table 1

[0026]

[0027] Table 2

[0028]

[0029] table 3

[0030]

[0031] As can be seen from Table 2 and Table 3, the steel coils whose hot-rolled steel coil numbers are 1 to 6 in Embodiment 1 are controlled at a heating temperature between 1170 and 1193° C. (average 1181.5° C.), and the total heating time is 140 ~142min, the product performance fully meets the standard requirements. Embodiment 1 Compared with the original method, the average heating temperature is reduced by 19.5° C., and th...

Embodiment 2

[0033] The hot-rolled steel coils are 7-11 steel coils, the steel quality is DX51D+Z, the chemical composition content is shown in Table 4, the rolling specification is 2.5×1050mm, the slab is cold-charged, and the slab exit temperature is 1163-1168°C ( average 1165.5°C), heating time 140-147min, the furnace temperature and total heating time of the preheating section, heating section and soaking section are shown in Table 5, after heating, hot continuous rolling rough rolling 5 passes, low carbon aluminum killed steel The final rolling temperature is 853-869°C, and the performance of the finished product is shown in Table 6.

[0034] Table 4

[0035]

[0036] table 5

[0037]

[0038] Table 6

[0039]

[0040] It can be seen from Table 5 and Table 6 that the heating temperature of the hot-rolled steel coils of Example 2 whose numbers are 7-11 is controlled at 1163-1168°C (1165.5°C on average), and the total heating time is 140-147min , Tracking product performance...

Embodiment 3

[0042] The hot-rolled steel coils are 12-18 steel coils, the steel is St13, the chemical composition content is shown in Table 7, the rolling specification is 3.25×1050mm, the billet is hot-charged at 575-615°C, and the billet exit temperature is 1167-1188 ℃ (average 1176.8 ℃), the total heating time is 137-143min, the furnace temperature and total heating time of the preheating section, heating section and soaking section are shown in Table 8, after heating, hot continuous rolling rough rolling 5 passes, low carbon The final rolling temperature of aluminum-killed steel is 871-890°C, and the properties of the finished product are shown in Table 9.

[0043] Table 7

[0044]

[0045] Table 8

[0046]

[0047] Table 9

[0048]

[0049] It can be seen from Table 8 and Table 9 that the heating temperature of the hot-rolled steel coils in Example 1 with the number 12-18 is controlled at 1167-1188°C (1176.8°C on average), and the total heating time is 137-143min , the pro...

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Abstract

The invention belongs to the technical field of production of hot rolling strip steel, and in particular relates to a hot rolling heating method for a low-carbon aluminum killed steel casting blank. The invention aims to solve the technical problem of providing a hot rolling heating method for the low-carbon aluminum killed steel casting blank, and the hot rolling heating method has low heating temperature and short heating time. To solve the technical problem, the invention uses the technical scheme that the temperature of a preheating section of a heating furnace is 1050-1150 DEG C, the temperature of a heating section is 1185-1230 DEG C, the temperature of a holding section is 1160-1200 DEG C, and the heating time of the heating furnace is 135-147min. By adopting the method of the invention for heating the low-carbon aluminum killed steel casting blank, the uniformity of the heating temperature of the low-carbon aluminum killed steel can be improved, the rolling process requirement is met, the heating temperature of the low-carbon aluminum killed steel casting blank is reduced by 40 DEG C averagely, low temperature heating is realized, the heating time is reduced by 10 minutes averagely, the yield and the heating quality of the heating furnace are improved, the fuel consumption of the heating furnace is reduced, and the comprehensive effects of increasing yield, guaranteeing quality, saving energy and reducing consumption are obtained.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled steel strip production, and in particular relates to a hot-rolled heating method for a low-carbon aluminum killed steel slab. Background technique [0002] With the adjustment of the national industrial policy, the application and production scale of electrical steel is gradually increasing. Among them, the heating temperature of the required non-oriented electrical steel is relatively low (generally 1120-1160°C), which is very different from the heating temperature of 1200-1250°C for general hot-rolled strip steel. In order to avoid the difficulties caused by simultaneous heating of high-temperature steel and low-temperature steel in the same heating furnace, a method of leaving a space between high-temperature steel and low-temperature steel can be used. However, this method will reduce the productivity of the heating furnace and reduce economic benefits. This problem is well solved by arran...

Claims

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Application Information

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IPC IPC(8): C21D8/00
Inventor 温亚成佘广夫方淑芳吕敬东邱敏
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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