CN106513444A - Method for preventing decarbonization through blank charging sequence control - Google Patents

Abstract

The invention discloses a method for preventing decarbonization through blank charging sequence control. The heating temperatures of all types of steel are classified according to the ingredients, the temperatures and sensitivity to temperatures of the steel, and the product heating detects due to the fact that when temperature difference is large, the charging sequence is too close, and it is too late for a heating furnace to adjust the temperature are overcome; the steel is divided into five types to solve the heating quality problem caused by mixed arrangement of the steel; and charging sequence control of different types of steel is determined according classification. According to the method for preventing decarbonization through blank charging sequence control, the blank charging sequence is controlled according to a classification principle, and the product heating detects due to the fact that when temperature difference is large, the charging sequence is too close, and it is too late for the heating furnace to adjust the temperature are overcome.

Description

A kind of blank enters the anti-decarbonization method of stove sequential control

Technical field

The invention belongs to field of metallurgy, is related to a kind of steel rolling continuous-type furnace blank and enters stove sequence control method, specifically Say it is, for the different heating-up temperature of different steel grades, how to enter the anti-decarbonization method of stove in order.

Background technology

In steel rolling mill, according to the delivery requirements of client, heating furnace is arranged into according to the corresponding blank of order and is heated, Reach the heating-up temperature specified to come out of the stove rolling.

Decarburization of the variety steel to product requires difference, but for continuous-type furnace, controls the de- of different steel grades Carbon is more difficult, and when especially the adjacent steel grade temperature difference is larger, this phenomenon is particularly evident.By rational principle of classification, according to Principle of classification control blank enters stove order, when reduction temperature difference is larger, enters stove order too closely, and heating furnace has little time adjustment temperature Degree, causes product heating defect.

Blank, when blank enters stove, is held up movement according to certain step pitch by stepping mechanism, no by walking beam heating furnace It is blank by absorbing stove exit gas temperature being preheated for hot arc, when moving to for hot arc, begins through the fire of burner Flame temperature atmosphere is heated, and when two kinds of different steel grades join in the same area, when especially temperature difference is larger, is lowered the temperature or is heated up Process is all to need the regular hour, is now possible to heating-up temperature in a period of time and produces impact to one of steel grade, If caused because temperature is too high, blank decarburization is exceeded to cause whole stove to sentence useless, and benefit and the market image are brought greater impact.Need Seek a kind of method to solve this problem.

The content of the invention

For different steel grade different heating temperature, it is an object of the invention to provide a kind of blank enters the anti-decarburization of stove sequential control Method, entering stove order by blank carries out anti-Decarburization Control, when reduction temperature difference is larger, enters stove order too closely, and heating furnace comes Not as good as adjustment temperature, product heating defect is caused.

The purpose of the present invention is achieved through the following technical solutions：

A kind of blank enters the anti-decarbonization method of stove sequential control, it is characterised in that：The method is according to the composition of steel grade, temperature, to temperature All steel grade heating-up temperatures are classified by the sensitivity of degree, when reduction temperature difference is larger, enter stove order too closely, and heating furnace comes Not as good as adjustment temperature, product heating defect is caused；Specific requirement is as follows：

1）Steel grade is divided into into five big class, to solve the problems, such as heating quality that steel grade mixing brings；

Ⅰ：Mild steel：Q195-235、HPB235、DF01；

Ⅱ：Spring steel：60Si2MnA、55SiCrA；

Pin cloth series: NZB52B、NZB52BE；

Ⅲ：High standard bearing steel： GCr15-X1；

Ⅳ：Chain：15Mn3Al、20Mn；

CrMo：20CrMoA、35CrMoA；

CrMnTi：20CrMnTi、30CrMnTi；

Welding wire steel: ER70S-6-1、ER70S-6-2；

Number steel:35#-80#、72A、82A；

Ⅴ：Bearing steel：GCr15；

Automatic steel：SUM43、SUM23HS；

Cord steel：C72/82DA；

2）Sequential control when entering stove between different steel grades, Controlling principle are formulated in the classification by more than：It is preferential between same class steel Layout together；Shove charge order be：II → III → IV → V or V → IV → III → II；I class steel is used as between II-V any two class Transition steel, quantity be more than 20；If I class steel quantity not enough, carries out sky step pitch；

3）Steel billet is heated by heating technological requirement, when low-temperature steel is transitioned into by high-temperature steel, close if cooling is had little time Closing part point burner, must treat temperature if being transitioned into high-temperature steel by low-temperature steel and having little time intensification.

2nd, blank according to claim 1 enters the anti-decarbonization method of stove sequential control, it is characterised in that：Empty step pitch is concrete Number is as follows：

Ⅱ→Ⅲ：20、Ⅱ→Ⅳ：15、Ⅱ→Ⅴ：40、

Ⅲ→Ⅳ：10、Ⅲ→Ⅴ：30、

Ⅳ→Ⅴ：10.

The present invention by classifying to all steel grade heating-up temperatures, the main composition and temperature according to steel grade, next to that The sensitivity of temperature is studied.Steel grade is divided into into five big class, to solve the problems, such as heating quality that steel grade mixing brings.

The present invention by studying the composition of steel grade, temperature, to sensitivity of decarburization etc., rational principle of classification, according to Principle of classification control blank enters stove order, when reduction temperature difference is larger, enters stove order too closely, and heating furnace has little time adjustment temperature Degree, causes product heating defect.

Specific embodiment

A kind of blank enters the anti-decarbonization method of stove sequential control, composition, temperature according to steel grade, the sensitivity to temperature, to institute There is steel grade heating-up temperature to be classified, when reduction temperature difference is larger, enter stove order too closely, heating furnace has little time to adjust temperature, Cause product heating defect；Specific requirement is as follows：

Steel classification table is shown in Table 1, formulates sequential control when entering stove between different steel grades by above sort research, and control is former Then.Preferential layout together between same class steel；Shove charge order be：II → III → IV → V or V → IV → III → II；I class steel is made For the transition steel between II-V any two class, quantity is more than 20；If I class steel quantity not enough, carries out sky step pitch；Empty step pitch Number synopsis is shown in Table 2.Scheduler's clearly empty step pitch number in production daily planning, raw material work is on production schedule list on duty Sky step pitch number is indicated, P1 platforms operative employee strictly enters steel by this requirement；Heating furnace sees that firer is entered to steel billet by heating technological requirement Row heating, if having little time cooling when being transitioned into low-temperature steel by high-temperature steel can close part burner, is transitioned into high temperature by low-temperature steel If steel has little time intensification must treat temperature.

Table 1

Table 2（Unit：）

Claims (2)

1. a kind of blank enters the anti-decarbonization method of stove sequential control, it is characterised in that：The method is according to the composition of steel grade, temperature, right All steel grade heating-up temperatures are classified by the sensitivity of temperature, when reduction temperature difference is larger, enter stove order too closely, heating furnace Have little time to adjust temperature, cause product heating defect；Specific requirement is as follows：

1）Steel grade is divided into into five big class, to solve the problems, such as heating quality that steel grade mixing brings；

Ⅰ：Mild steel：Q195-235、HPB235、DF01；

Ⅱ：Spring steel：60Si2MnA、55SiCrA；

Pin cloth series: NZB52B、NZB52BE；

Ⅲ：High standard bearing steel： GCr15-X1；

Ⅳ：Chain：15Mn3Al、20Mn；

CrMo：20CrMoA、35CrMoA；

CrMnTi：20CrMnTi、30CrMnTi；

Welding wire steel: ER70S-6-1、ER70S-6-2；

Number steel:35#-80#、72A、82A；

Ⅴ：Bearing steel：GCr15；

Automatic steel：SUM43、SUM23HS；

Cord steel：C72/82DA；

2）Sequential control when entering stove between different steel grades, Controlling principle are formulated in the classification by more than：It is preferential between same class steel Layout together；Shove charge order be：II → III → IV → V or V → IV → III → II；I class steel is used as between II-V any two class Transition steel, quantity be more than 20；If I class steel quantity not enough, carries out sky step pitch；

3）Steel billet is heated by heating technological requirement, when low-temperature steel is transitioned into by high-temperature steel, close if cooling is had little time Closing part point burner, must treat temperature if being transitioned into high-temperature steel by low-temperature steel and having little time intensification.

2. blank according to claim 1 enters the anti-decarbonization method of stove sequential control, it is characterised in that：The concrete number of empty step pitch It is as follows：

Ⅱ→Ⅲ：20、Ⅱ→Ⅳ：15、Ⅱ→Ⅴ：40、

Ⅲ→Ⅳ：10、Ⅲ→Ⅴ：30、

Ⅳ→Ⅴ：10.