CN109092893A

CN109092893A - 60 meters of overlength Plate Production techniques

Info

Publication number: CN109092893A
Application number: CN201810717027.0A
Authority: CN
Inventors: 朱豪; 赵虎; 闫梦江; 陈扬; 孔鹏; 王伟; 李进宝; 汤光飞; 其他发明人请求不公开姓名
Original assignee: Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2018-07-03
Filing date: 2018-07-03
Publication date: 2018-12-28

Abstract

The invention discloses a kind of 60 meters of overlength Plate Production techniques, C% is 0.11-0.17 in the steel plate ingredient, Si% 0.15-0.30, Mn% 0.35-0.65, P%≤0.018, S%≤0.01；Rolling mill practice: 1) slab quality requirement: slab cutting section is neat, and slab burr removing is clean；Slab length dimension is controlled by 0-10mm；2) heating process: 1 section of heating temperature is 1100 ± 50 degree, and 2 sections of heating temperatures are 1250 ± 30 degree, and soaking zone heating temperature is 1220 ± 20 degree, heating speed: 6.8-8Min/cm；Rolling mill practice and key control point: a, rolling mill practice: finished product thickness 7.5-12.5mm, start rolling temperature is 1050-1120 degree, needless to say warm, and finish to gauge target temperature is 780-800 ± 50 degree；B, roll control main points: start rolling temperature is set according to 1070 ~ 1150 DEG C, intermediate base thickness of two sides deviation is less than 1mm, L2 target thickness difference is less than 1mm, roll cooling water is according to 30% ~ 50% setting, 1st passage and the 3rd passage de-scaling after open rolling, thickness forbids de-scaling after being less than 20mm, and the finish rolling stage uses 7 passes, final reduction rate < 10%.

Description

60 meters of overlength Plate Production techniques

Technical field

The present invention relates to a kind of 60 meters of overlength Plate Production techniques.

Background technique

Furnace can not be entered by the blank of heating furnace structure design limitation, 1800 ~ 2200mm length, be cooled a width structure design Limitation, 31.5 meters of length of steel plate maximum flash.It is 220* that blank can only be organized when original production 10 ~ 12mm thickness thin specification steel plate The small blanks of 1250 ~ 1800*1500 ~ 1800 produces, and production efficiency is low, high production cost.

For this situation, a staging device is increased newly before cold bed, mentioned by way of going up cold bed again after steel plate sectional The mill length and billet size of high steel plate.In the actual production process, 10 ~ 12mm thickness thin specification steel plate mill length increases After adding to 60 meters, Strip Shape Control difficulty increases, and rolling waste product, plate shape waste product are significantly increased；Temperature drop during steel plate rolling simultaneously Fastly, head and tail temperature difference is big, and frequently there is a situation where elongation percentage not to conform to.

Searching document discloses: (1) Pi Kaijian, Wang Xin, Liu Shu, Cao Kaichen, Hu Jiayong, Dai Conghan are in " steel rolling " 200502 Phase is mentioned in publishing thesis through cold bed mode on process sequence planning change steel plate.(2) Hu Xianlei, Zhao Zhong, Ding Jingguo are in " steel Iron studies journal " 201505 phases published thesis middle explanation for thin specification steel plate, continuous rolling process steel plate it is accumulative warm end to end Difference in a certain range when the formulation of rolling force setup and TMCP technique is influenced it is smaller, it is not necessary to it is special to account for.(3) Li Yanzhi, Huai is brave, Shi Yixiang, and Zhang Aiqin bites form, increasing in interim mention of " Wide and Thick Slab " 201104 by adjusting steel plate head Add and bites the measures raising thin specification steel plate such as speed limit, maximum speed limitation and final reduction rate, speed control mode control Plate form control.(4) Wang Liyun, Liu Zhiyong, Yu Weihong, Qin Kun etc. wherein illustrate Q235B cut deal in " Hebei Metallurgy " 201207 The underproof main cause of elongation percentage is containing more field trash and banded structure in steel, by changing after steel-making and steel rolling process It can improve into rear performance.

From information above: improvement and composition adjustment by process for making control Slag inclusion and nocuousness member in molten steel Element, while to rolling mill practice heating temperature, the strict control of rolling temperature, the extension property of steel plate can be improved；In addition, Improved by equipment precision, rolling strategy adjustment, biting speed, to stick up the technological parameters such as discount coefficient, bending roller force, reduction ratio excellent Change, improve rolling stability, raising rolls into rate.

Summary of the invention

The purpose of the present invention is to provide a kind of 60 meters of overlength Plate Production techniques, are able to solve thin gauge overlength steel plate and prolong The problem of stretching low qualified；And it reduces and rolls the problems such as useless, plate shape is useless caused by rolling Strip Shape Control hardly possible.

The object of the present invention is achieved like this, a kind of 60 meters of overlength Plate Production techniques, C% in the steel plate ingredient For 0.11-0.17, Si% 0.15-0.30, Mn% 0.35-0.65, P%≤0.018, S%≤0.01；Rolling mill practice: 1) slab Quality requirement: slab cutting section is neat, and slab burr removing is clean；Slab length dimension is controlled by 0-10mm；2) heater Skill: 1 section of heating temperature is 1100 ± 50 degree, and 2 sections of heating temperatures are 1250 ± 30 degree, and soaking zone heating temperature is 1220 ± 20 Degree, heating speed: 6.8-8Min/cm；Rolling mill practice and key control point: a, rolling mill practice: finished product thickness 7.5-12.5mm are opened Rolling temperature is 1050-1120 degree, needless to say warm, and finish to gauge target temperature is 780-800 ± 50 degree；B, roll control main points: open rolling temperature Degree is set according to 1070 ~ 1150 DEG C, and intermediate base thickness of two sides deviation is less than 1mm, and L2 target thickness difference is less than 1mm, finish rolling open rolling Before turn bottom roller cooling water down, roll cooling water is according to 30% ~ 50% setting, and the 1st passage and the 3rd passage de-scaling, thickness are small after open rolling Forbid de-scaling after 20mm, the finish rolling stage uses 7 passes, and final reduction rate < 10%, start rolling temperature and finishing temperature are pressed The control of pyrometer measured value, preferentially guarantees finishing temperature, in the operation of rolling, according to each passage steel plate centering situation, increases primary Manual intervention manipulator before steel is stung, stings steel after righting automatically.

Beneficial effects of the present invention:

1, implementation through the invention, rolled piece maximum length increase to 60 meters, to improve the weight of monolithic steel plate, effectively Heating efficiency and unit-hour output are improved, is counted according to 2 months 2017 to July creation datas, unit-hour output improves 16.3%。

2, production through the invention is used, and by slab base type, gradually cured concentration fixes base type, and it is disconnected to reduce continuous casting The replacement frequency in face, slab is smelted and the organization of production of rolling.

Specific embodiment

A kind of 60 meters of overlength Plate Production techniques, C% is 0.15, Si% 0.225 in the steel plate ingredient, and Mn% is 0.45, P%≤0.018, S%≤0.01；By composition adjustment, Mn component target value is adjusted from 0.55 to 0.45, at the same improve P, The control requirement of the harmful elements such as S, reduces steel plate degree of segregation, reduces the sulfide Slag inclusion in segregated zone.

Rolling mill practice:

1) slab quality requirement: slab cutting section is neat, and slab burr removing is clean；Slab length dimension is controlled by 0-10mm System；When rolling 60mm overlength steel plate, two bringing-up section temperature are controlled according to 1250 ~ 1280 DEG C, and upper and lower part temperature difference presses 20-30 DEG C (upper table high), to guarantee higher start rolling temperature and reduces the following table temperature difference on operation of rolling light plate with this.

2) heating process: 1 section of heating temperature is 1100 ± 50 degree, and 2 sections of heating temperatures are 1250 ± 30 degree, soaking zone heating Temperature is 1220 ± 20 degree, heating speed: 6.8-8Min/cm；

Rolling mill practice and key control point:

A, rolling mill practice: finished product thickness 7.5-12.5mm, start rolling temperature is 1050-1120 degree, needless to say warm, finish to gauge target temperature For 780-800 ± 50 degree；

B, roll control main points: start rolling temperature is set according to 1070 ~ 1150 DEG C, and intermediate base thickness of two sides deviation is less than 1mm, L2 Target thickness difference is less than 1mm, turns bottom roller cooling water before finish rolling open rolling down, and roll cooling water is according to 30% ~ 50% setting, the after open rolling 1 passage and the 3rd passage de-scaling, thickness forbid de-scaling after being less than 20mm, and the finish rolling stage uses 7 passes, and final reduction rate < 10%, start rolling temperature and finishing temperature are controlled by pyrometer measured value, preferentially guarantee finishing temperature, in the operation of rolling, according to each road Secondary steel plate centering situation, increase once sting manual intervention manipulator before steel, sting steel after righting automatically.

Claims

1. a kind of 60 meters of overlength Plate Production techniques, it is characterised in that: C% is 0.11-0.17 in the steel plate ingredient, and Si% is 0.15-0.30, Mn% 0.35-0.65, P%≤0.018, S%≤0.01；Rolling mill practice: 1) slab quality requirement: slab cutting Section is neat, and slab burr removing is clean；Slab length dimension is controlled by 0-10mm；2) heating process: 1 section of heating temperature is 1100 ± 50 degree, 2 sections of heating temperatures are 1250 ± 30 degree, and soaking zone heating temperature is 1220 ± 20 degree, heating speed: 6.8- 8Min/cm；Rolling mill practice and key control point: a, rolling mill practice: finished product thickness 7.5-12.5mm, start rolling temperature 1050- 1120 degree, needless to say warm, finish to gauge target temperature is 780-800 ± 50 degree；B, roll control main points: start rolling temperature according to 1070 ~ 1150 DEG C of settings, intermediate base thickness of two sides deviation are less than 1mm, and L2 target thickness difference is less than 1mm, turns bottom roller down before finish rolling open rolling Cooling water, roll cooling water is according to 30% ~ 50% setting, the 1st passage and the 3rd passage de-scaling after open rolling, and thickness is prohibited after being less than 20mm Only de-scaling, finish rolling stage are surveyed using 7 passes, final reduction rate < 10%, start rolling temperature and finishing temperature by pyrometer Value control, preferentially guarantees finishing temperature, in the operation of rolling, according to each passage steel plate centering situation, increases artificial before once stinging steel Intervene manipulator, stings steel after righting automatically.