CN100443201C - Surface iron scale control method for middle sheet billet continuous casting and rolling steel plate - Google Patents
Surface iron scale control method for middle sheet billet continuous casting and rolling steel plate Download PDFInfo
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- CN100443201C CN100443201C CNB2007100101835A CN200710010183A CN100443201C CN 100443201 C CN100443201 C CN 100443201C CN B2007100101835 A CNB2007100101835 A CN B2007100101835A CN 200710010183 A CN200710010183 A CN 200710010183A CN 100443201 C CN100443201 C CN 100443201C
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Abstract
The invention discloses a controlling method of iron oxide sheet of rolled band steel surface of middle-thin board blank, which is characterized by the following: controlling component; proceeding heat load directly; heating to remove phosphor; rolling under high temperature; forcing to cool; controlling Si content in the steel; eliminating red ferric oxide on the surface of heat roll steel; fitting for the steel with not more than 0.18%C, not more than 0.20% Si, not more than 1.50% Mn, not more than 0.015% P, not more than 0.01% S and Nb, V and Ti.
Description
Technical field
The invention belongs to a kind of surface of steel plate treatment technology, is a kind of method of removing scale on surface in the continuous casting billet heating and the operation of rolling specifically.
Background technology
Strand owing to react with oxygen, certainly leads to certain iron scale at strand or billet surface in heating, conveying, the operation of rolling, if can not remove well, with the surface quality of steel plate after greatly influence is rolled.Thereby all manufacturers have all given abundant attention and further investigation to eliminating the billet surface iron scale, and adopt various measures and solved.
Up to now, though it is a lot of to remove the measure of billet surface iron scale, nearly all solution all is to take single physical method, i.e. mechanical descaling, high-pressure water descaling, shot-peening or utilize flexural deformation to remove iron scale etc.Introduced " processing method and the isolated plant on a kind of hot-strip surface " as Chinese patent application number 02137851, when " the band steel enters the loose part of iron scale; make the flexural deformation of band steel by depress roller and carrying roller; destroy the physical arrangement of iron scale, reaches the loose and part of iron scale is come off from the band steel matrix "; Simultaneously, ", the iron scale of belt steel surface is removed " by the running of last lower plane wire brush dish.Weak point is to need to increase special equipments such as several depress rollers and carrying roller, and investment is increased; Increased operations such as smooth, tension, production cost is improved; This method only is suitable for producing the used hot-strip material of cold-strip steel, and is difficult to satisfy bigger strand of thickness and casting and rolling process.In addition, a kind of " continuous casting billet descaling device " (application number 03269581), the scheme of being taked is to set up main and auxiliary sparge pipe and water-cooling cover, slag-draining device etc. on rollgang, utilizes spraying pressurized water to sweep, to remove the iron scale of strand lower surface.Its defective: the one, increased facility and input; The 2nd, reduced the base temperature, increased energy consumption; The 3rd, only handled lower surface, upper surface is still unresolved.
It is worthy of note, for short flow process continuous casting and rolling production line, especially thickness is the strand of 100-170mm, because it is between conventional strand and CSP strand, the strand time inside furnace is shorter, stove pig iron skin is thinner than the conventional strand of producing, if adopt conventional production technology, descaling device and descaling process, then this thin iron scale will be difficult to eliminate.Tracing it to its cause is, strand is in heating process, and oxide is mainly FeO and a spot of Fe
3O
4And Fe
2O
3Therefore the length of strand time inside furnace is very big to the structure and the properties influence of scale on surface.The steel billet of general unlike material, different-thickness, its heat time heating time and temperature are different.As conventional strand, because time inside furnace is long, stove pig iron skin is thicker, has higher growth stress, and iron scale is relative with the adhesion of matrix less, removes easily in the de-scaling process.And the strand that short flow process continuous casting and rolling is produced is short at stove and rolling time, and the iron sheet of generation is thinner, and is peony, and viscosity is big, strong adhesion, and promptly the adhesion of iron scale and steel billet matrix is relatively large, is difficult to eliminate easily.In case de-scaling is unclean, in the follow-up operation of rolling, very easily produce Fe
2O
3The red iron oxide skin.This Fe
2O
3The red iron oxide skin will strengthen the difficulty of control of product quality in the subsequent process after surface of steel plate forms, have a strong impact on the surface quality and the result of use of steel plate.
In addition, by strand is heated in heating furnace and the operation of rolling in the structure and the The Characteristic Study of formed iron scale, and the check and analysis of the origin cause of formation prove that the existence owing to elements Si in the strand forms FeO/Fe between iron scale and the strand matrix in heating furnace
2SiO
4Spinel compound firmly combines matrix and oxide layer, causes the incomplete of de-scaling, and finally forms surperficial red iron scale (Fe because of the continuation oxidation of FeO
2O
3).And this iron sheet is to be difficult to remove in case formation only depends on simple physics (machinery) method.
Given this, the present invention is according to the characteristics of short-flow production line and slab thickness, and red iron oxide skin formation mechanism, and development and design goes out a kind of physics and combines with chemical method, the method of the red iron scale in removal hot rolled steel plate surface for the treatment of both principal and secondary aspect of disease is to guarantee to roll the surface quality of back steel plate.
Summary of the invention
Purpose of the present invention, aiming to provide a kind ofly need not increase equipment and investment, does not increase production cost, makes full use of existing equipment and technological process, by the improvement of chemical Composition Control and process system, just can eliminate the method for the red iron scale in hot rolled steel plate surface.Its concrete solution is:
The present invention is directed to medium thin slab continuous casting and rolling technology,, take Composition Control in conjunction with the characteristics of 100-170mm thickness continuous casting billet, direct hot charging, high temperature heating, high temperature de-scaling, high temperature rolling is forced series of processes methods such as cooling and temperature control batch, and eliminates the red iron scale in hot rolled steel plate surface.
The main production route is: concise outside converter smelting-stove-sheet billet continuous casting-direct hot charging-heating-de-scaling-roughing-de-scaling-finish rolling-as to cool off-batch.
Composition Control scope (mass percent): C 0.049-0.20, Si 0.015-0.20, Mn 0.15-1.50, P 0.009-0.013, S 0.004-0.01, Nb 0-0.04, V 0-0.04, Ti 0-0.02, surplus is Fe and trace impurity.
Direct hot charging: the continuous casting billet direct heat heating furnace of packing into.
The high temperature heating: strand is heated to 1180-1300 ℃, is incubated 40-100min in stove.
The high temperature de-scaling: strand adopts the multiple spot high-pressure water descaling to handle after going out heating furnace, and de-scaling point temperature before the roughing＞1160 ℃, each point de-scaling pressure＞17MPa.
High temperature rolling: the operation of rolling is taked the elevated temperature heat rolling method, roughing start rolling temperature＞1130 ℃; Finish rolling start rolling temperature＞1030 ℃; Finishing temperature＞880 ℃;
Force cooling: roll back laminar flow cooling and take to force the method cooled off, 4 ℃ of cooling velocities/s-17 ℃/s;
Temperature control batches: coiling temperature is controlled at 550-650 ℃.
In order to obtain good plate surface quality, the material impact that the red iron oxide skin is generated according to Si, so in smelting and concise process, Si content must be strict controlled in≤0.20%.The strand chemical composition is controlled at by mass percentage: C 0.07-0.18, Si 0.018-0.18, Mn 0.37-1.35, P 0.010-0.012, S 0.006-0.009, Nb 0-0.04, V 0-0.04, Ti 0-0.02, all the other are Fe and impurity.
According to chemical composition, the preferential production process system of recommending is:
Behind the hot charging, continuous casting billet heating-up temperature in heating furnace reaches 1250-1280 ℃, temperature retention time 50-90min in stove.
De-scaling point temperature is answered＞1180 ℃ before the strand roughing, de-scaling pressure＞18MPa.
In the operation of rolling, the roughing start rolling temperature is controlled at＞and 1150 ℃, finish rolling start rolling temperature＞1050 ℃.
The cooling velocity that strand rolls back laminar flow cooling is 5 ℃/s-15 ℃/s.
Beneficial effect of the present invention is very remarkable:
The one, adopted the rational chemical control method, especially strict control Si content has not only reduced the generation of iron scale, and the iron scale of generation is more easily removed;
The 2nd, adopt the intermediate gauge continuous casting billet, carry out fast continuous casting, direct hot charging, strand is short heat time heating time, so heat loss is few, and the heating energy consumption is low, and production efficiency improves;
The 3rd, take selection process such as high temperature heating, high temperature de-scaling, high temperature rolling, both improved scale removal effect, reduced draught pressure and rolling electric current again, energy-saving effect is obvious.
Simultaneously, because the present invention has taked integrated technology measure and series of processes method for optimizing, surface of steel plate red iron oxide skin coverage rate is reduced, surface quality improves; The more important thing is and improved the strand internal soundness, guaranteed the intensity and the toughness reguirements of steel plate.
The specific embodiment
Below in conjunction with embodiment, main contents such as the present invention's Composition Control scope, preferred forms are described further.
The technological process of production: desulfurizing iron-converter smelting-external refining-sheet billet continuous casting-direct hot charging-strand heating-high pressure descaling-roughing-de-scaling-finish rolling-laminar flow cools off-batches.
Thickness of strand scope: 100-170mm.
Roll back steel plate thickness specification: less than 25mm.
Composition Control scope example (mass percent):
| Composition | C | Si | Mn | P | S | Nb | V | Ti |
| Example 1 | 0.07 | 0.20 | 1.34 | 0.009 | 0.005 | 0.03 | 0.03 | 0.017 |
| Example 2 | 0.08 | 0.19 | 1.26 | 0.01 | 0.008 | 0.02 | 0.01 | |
| Example 3 | 0.12 | 0.12 | 1.50 | 0.013 | 0.006 | 0.018 | ||
| Example 4 | 0.049 | 0.015 | 0.15 | 0.009 | 0.004 | |||
| Example 5 | 0.20 | 0.16 | 0.28 | 0.01 | 0.009 |
The ingredients listed, all the other are Fe and trace impurity in table.
According to the composition of example 1, its rear portion processing step is:
Continuous casting tundish molten steel overtemperature is controlled at＜and 40 ℃, mould liquid level fluctuation range ± 2mm, the conticaster casting speed is controlled at 3.5-4.5m/min.
Casting back continuous casting billet direct hot charging; In heating furnace, be heated to 1300 ℃, insulation 100min.
Carry out the multiple spot high-pressure water descaling after strand is come out of the stove and handle, de-scaling point temperature is 1280 ℃ before the roughing, each point de-scaling pressure 18MPa.
Rolling mill practice is taked the elevated temperature heat rolling method, 1180 ℃ of roughing start rolling temperatures; Roll the back de-scaling; 1070 ℃ of finish rolling start rolling temperatures; Finishing temperature is 940 ℃.Rolling the back adopts laminar flow to force cooling, 15 ℃/s of cooling velocity.Batch after the cooling, coiling temperature is about about 650 ℃.
The casting and rolling process system of example 4 is:
Tundish molten steel overtemperature is controlled at 30 ℃, casting speed 2.0-3.0m/min.
Hot charging is heated to 1180 ℃, insulation 50min; 1160 ℃ of the preceding de-scaling point temperature of the back roughing of coming out of the stove, pressure 17MPa;
1090 ℃ of roughing start rolling temperatures, 1000 ℃ of final rolling temperatures, 890 ℃ of finishing temperatures; Roll 8 ℃/s of back laminar flow cooling velocity.590 ℃ of coiling temperatures.
Hot rolled steel plate casting and rolling process system and example 1,4 in example 2,3,5 and other Composition Control scopes of the present invention are similar.Be specially:
Tundish molten steel overtemperature during continuous casting＜40 ℃, mould liquid level fluctuation range ± 2mm, conticaster casting speed 1.5-4.5m/min.The continuous casting billet direct hot charging is heated to 1180-1300 ℃ in heating furnace, insulation 40-100min in the stove.Carry out the multiple spot high-pressure water descaling after strand is come out of the stove, the de-scaling temperature is 1160 ℃ before the roughing, each point de-scaling pressure 17MPa.Adopt elevated temperature heat rolling method, 1130 ℃ of roughing start rolling temperatures, 1030 ℃ of finish rolling start rolling temperatures, 880 ℃ of finishing temperatures in rolling.Roll the back and force cooling, 4-17 ℃/s of laminar flow cooling velocity.Coiling temperature is controlled at 550-650 ℃.
Claims (6)
1, a kind of medium thin slab continuous casting and rolling belt steel surface iron scale control method is characterized in that: take Composition Control, direct hot charging, the high temperature heating, high temperature de-scaling, high temperature rolling, force cooling and temperature control coiling technique method, eliminate the red iron scale in hot rolled steel plate surface:
Composition Control:
Its chemical composition mass percentage content is:
C 0.049-0.20, Si 0.015-0.20, Mn 0.15-1.50, P 0.009-0.013, S 0.004-0.01, Nb 0-0.04, V 0-0.04, Ti 0-0.02, surplus is Fe and trace impurity;
Direct hot charging:
The continuous casting billet direct hot charging;
The high temperature heating: strand is heated to 1180-1300 ℃, is incubated 40-100min in stove;
The high temperature de-scaling:
Strand adopts the multiple spot high-pressure water descaling to handle after going out heating furnace, and de-scaling point temperature before the roughing＞1160 ℃, each point de-scaling pressure＞17MPa;
High temperature rolling:
The operation of rolling is taked the elevated temperature heat rolling method, roughing start rolling temperature＞1130 ℃; Finish rolling start rolling temperature＞1030 ℃; Finishing temperature＞880 ℃;
Force cooling:
Roll back laminar flow cooling and take to force the method cooled off, 4 ℃ of cooling velocities/s-17 ℃/s;
Temperature control batches:
Coiling temperature is controlled at 550-650 ℃.
2, medium thin slab continuous casting and rolling belt steel surface iron scale control method according to claim 1, it is characterized in that: preferential chemical composition mass percent of recommending is: C 0.07-0.18, Si 0.018-0.18, Mn 0.37-1.35, P 0.010-0.012, S 0.006-0.009, Nb 0-0.04, V 0-0.04, Ti0-0.02, all the other are Fe and impurity.
3, medium thin slab continuous casting and rolling belt steel surface iron scale control method according to claim 1 is characterized in that: continuous casting billet in heating furnace heating-up temperature 1250-1280 ℃, temperature retention time 50-90min in stove.
4, medium thin slab continuous casting and rolling belt steel surface iron scale control method according to claim 1 is characterized in that: de-scaling point temperature before the strand roughing＞1180 ℃, de-scaling pressure 18MPa.
5, medium thin slab continuous casting and rolling belt steel surface iron scale control method according to claim 1 is characterized in that: the roughing start rolling temperature is controlled at＞1150 ℃, finish rolling start rolling temperature＞1050 ℃.
6, medium thin slab continuous casting and rolling belt steel surface iron scale control method according to claim 1 is characterized in that: the cooling velocity that strand rolls back laminar flow cooling is 10 ℃/s-15 ℃/s.
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| CNB2007100101835A CN100443201C (en) | 2007-01-25 | 2007-01-25 | Surface iron scale control method for middle sheet billet continuous casting and rolling steel plate |
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| CNB2007100101835A CN100443201C (en) | 2007-01-25 | 2007-01-25 | Surface iron scale control method for middle sheet billet continuous casting and rolling steel plate |
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| CN100443201C true CN100443201C (en) | 2008-12-17 |
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