CN102367546B - Control method for coast atmospheric corrosion resistant scale on surface of boat deck - Google Patents
Control method for coast atmospheric corrosion resistant scale on surface of boat deck Download PDFInfo
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- CN102367546B CN102367546B CN2011103349839A CN201110334983A CN102367546B CN 102367546 B CN102367546 B CN 102367546B CN 2011103349839 A CN2011103349839 A CN 2011103349839A CN 201110334983 A CN201110334983 A CN 201110334983A CN 102367546 B CN102367546 B CN 102367546B
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Abstract
The invention discloses a control method for coast atmospheric corrosion resistant scale on the surface of a boat deck, which belongs to the field of steel for hull structures. According to the invention, the structure and thickness of scale on the surface of a boat deck is controlled by optimizing production processes for boat decks. The method comprises the following key points: controlling parameters of heating temperature, time, residual oxygen and the like for continuous casting billets and reinforcing a de-scaling effect once; controlling the index of chloride ion in water for production, reducing the content of deposited chloride ions in scale and inhibiting corrosive pitting; controlling initial rolling temperature and finishing rolling temperature in the stage of finish rolling, reasonably utilizing a weak water cooling system, increasing the content of Fe3O4 in scale, reducing the content of Fe2O3, retaining a small amount of FeO and enabling the scale to have good plasticity, a bonding force and corrosion resistance. The advantages of the invention are as follows: it does not need to reconstruct existing equipment, and the surface quality and production efficiency of the boat deck can be enhanced through technological optimization; structural composition of the scale is reasonably controlled, which enables the surface of the boat deck to have excellent coast atmospheric corrosion resistance, especially enables corrosive pitting caused by chloride ions to be inhibited, and enables the storage duration of the boat deck in coast environment to be prolonged.
Description
Technical field
The invention belongs to hot rolled slab ship hull structure use rings technology territory, the control method of the anti-seashore atomospheric corrosion iron scale in particularly a kind of deck of boat surface is applicable to common intensity and HS (32kg level, the 36kg level) deck of boat.
Background technology
The deck of boat is one of important kind of Wide and Thick Slab.Since the fourth quarter in 2008, because the influence that global financial crisis takes place world economy, iron and steel and downstream industry receive bigger impact, mainly show as infrastructure investment and reduce, and the iron and steel demand declines to a great extent, and the steel products order is die-offed.Thus, shipyard generally runs into the shipowner and requires to defer delivery, and rhythm of production slows down, and deck of boat tank farm stock significantly increases with inventory cycle and prolongs.At 2009 beginning of the years, the user increases sharply to the quantity of deck of boat surface imperfection quality objection, and what wherein ratio was maximum is surperficial pockmark defective.
These defectives generally occur on the long deck of boat surface of storage period, generally surpass 3 months, and the quantity that pit occurs is often more; Presenting distribution of small and dispersed pit shape or aggregation distributes; Diameter can reach individually more than the 1mm between 0.1-0.5mm, and the pockmark degree of depth generally is about about 0.1-0.2mm; Defect level usually increases the weight of with the prolongation of steel plate storage time, and short product surface of PT does not have this type of defective basically.The major cause that produces this type of defective is that the deck of boat is under the seashore atmospheric environment before use for a long time; Scale on surface lacks enough protectiveness for matrix; Be prone under water surrounding, atomospheric corrosion take place; Form of corrosion is main with spot corrosion, and the cl ions that is deposited in the rusty scale brings out spot corrosion and quickens the spot corrosion development, and the main source of cl ions has two; The one, the cl ions in the steel plate production process in the water of productive use is deposited on surface of steel plate, and the 2nd, the cl ions in the storage process in the environment is deposited on surface of steel plate.Because this defective at surface of steel plate obviously and distribute extensively; Cause condition of surface defective, need could use after manual grinding or the repair welding, even the local darker pockmark of the degree of depth that often occurs; Polishing back inaccuracy of dimensions; Can't continue to use, thus whole steel plate scrap, for steel mill and shipyard, all cause great financial loss.
The surface pitting problem seriously perplexs steel mill and shipyard, under the prerequisite of not appending production cost, if will address this problem; Need through improving and optimize the ME of the deck of boat; Change the scale structure on deck of boat surface, increase the bonding force of itself and matrix, improve the ability of its anti-chlorine ion spot corrosion; The control spot corrosion quantity and the degree of depth prolong its stock phase.
Summary of the invention
The object of the present invention is to provide the control method of the anti-seashore atomospheric corrosion iron scale in a kind of deck of boat surface; Be used for further improving deck of boat surface quality, not only can reduce the article of taking out of, reduce production costs because of generations such as surface irregularity, iron scale are pressed into; The most important thing is to prolong the deck of boat is stock's phase under the seashore atmospheric environment; Improve the ability of its surperficial anti-chlorine ion spot corrosion, the control spot corrosion quantity and the degree of depth satisfy the shipbuilding request for utilization of shipyard.
The control techniques of the anti-seashore atomospheric corrosion iron scale in the deck of boat of the present invention surface is applicable to common intensity and high strength steel plate for ship building (32kg level, 36kg level).
The present invention controls the structure and the thickness of deck of boat scale on surface through optimizing deck of boat production technique.Specifically comprise: parameters such as control continuous blank heating temperature, time, residual oxygen strengthen one time scale removal effect; Cl ions index in the control water of productive use reduces sedimentary chloride ion content in the iron scale, suppresses spot corrosion; Open rolling, the finishing temperature in control finish rolling stage, and rationally utilize weak water-cooled system, improved Fe in the iron scale
3O
4Content reduces Fe
2O
3Content keeps small amount of Fe O, makes iron scale have good plasticity, bonding force and solidity to corrosion.The parameter of concrete technology and control is following:
(1) the chemical Composition Control wt% of continuously cast bloom:
C:0.14-0.18%, Si:0.10-0.30%, Mn:0.45-1.50%, Nb:0.005-0.04%, Ti:0.005-0.02%, S :≤0.01%, P≤0.02%, Als:0.020-0.04%, surplus is Fe and unavoidable impurities.
The chemical ingredients wt% of preferred slab:
C:0.15-0.18%, Si:0.10-0.30%, Mn:0.45-1.30%, Nb:0.005-0.02%, Ti:0.005-0.02%, S :≤0.01%, P≤0.02%, Als:0.02-0.04%, surplus is Fe and unavoidable impurities.
(2) continuously cast bloom heating cycle
The continuously cast bloom tapping temperature is controlled at 1180-1200 ℃, and time inside furnace is controlled at 260-290min, and the residual Control for Oxygen Content of process furnace is at 1-8%; Improved the once oxidation iron sheet structure, gauge control is at 0.5-2.0mm, reduces pore, and compact structure has improved the separability of iron scale.
(3) descaling process
The chloride ion content of de-scaling water and steel plate inspection water is lower than 100mg/L in the control deck of boat production process: because cl ions has promoter action for the acidication effect that takes place in the pit under the water surrounding, it is remarkable for storage period inhibition spot corrosion generation, development function to reduce the deposition of cl ions in the surface of steel plate iron scale.Guarantee a de-scaling temperature at 1173-1120 ℃, each de-scaling point pressure guarantees at 18-21MPa; The finish rolling stage according to the thickness specification select the 1st with the 3rd passage or the 3rd descaling process different with the 5th passage.
(4) rolling technology
Rough rolling step de-scaling system is taked the odd-numbered pass de-scaling, guarantees scale removal effect.Rolling pattern is taked to depress greatly, and draught per pass 10-35mm guarantees dynamic recrystallization completely, so that eliminate as-cast structure fully, refine austenite crystal grain;
According to the intensity rank and the thickness specification of the deck of boat, optimize rolling technology, finishing temperature is controlled at 880-990 ℃; Thickness≤20mm steel plate, finishing temperature is at 950-990 ℃; Thickness＞20mm steel plate, finishing temperature is at 880-950 ℃; Guarantee to generate a certain amount of FeO before the plate face gets into water cooling stage, in order to improve iron scale plasticity and with the bonding force of matrix.Thickness≤20mm steel plate finish rolling stage is adopted the 1st passage or the 1st and the 3rd passage de-scaling, and thickness＞20mm steel plate finish rolling stage is adopted the 3rd and the 5th passage de-scaling, guarantees scale removal effect, avoid since the clean iron scale of de-scaling to be pressed into the plate face that causes coarse.
(5) roll the back and adopt ACC (cooling fast) water-cooled system, the finished product steel plate begins to cool down temperature 850-950 ℃, and final cooling temperature is controlled at 670-750 ℃, and cooling rate is set at 5-15 ℃/s, and the composition that makes iron scale is with Fe
3O
4With FeO be main, improve Fe
3O
4Content has been avoided Fe in temperature-fall period
3O
4The too much Fe that is converted into
2O
3Adopt 1 passage aligning after the water-cooled, avoided the harder Fe in top layer under the prerequisite of assurance template as far as possible
3O
4And Fe
2O
3Sudden and violent is pressed into matrix and causes surperficial pockmark defective.
The present invention compares its advantage with the Wide and Thick Slab product iron scale control techniques of existing patent introduction and is:
1, need not existing installation is transformed, only improve deck of boat surface quality, and further improved production efficiency through process optimization.
2, the structure of rationally having controlled iron scale is formed, and effectively raises the plasticity of deck of boat scale on surface under the stress-strain condition.
3, deck of boat scale on surface has good anti-seashore atomospheric corrosion ability, suppresses the spot corrosion that cl ions causes, prolongs its coastal environment storage period.
Description of drawings
Deck of boat iron scale cross section pattern before Fig. 1 iron scale control techniques is implemented.
Fig. 2 iron scale control techniques is implemented deck of boat iron scale cross section, back pattern.
Embodiment
As shown in Figure 1, poor for general deck of boat production technique lower surface iron scale cross section pattern with the matrix bonding force, short texture.Fig. 2 is for the deck of boat scale on surface cross section pattern of control techniques after implementing, and is better with the matrix bonding force, compact structure, and gauge control is below 45 μ.Scale structure is mainly by three parts (FeO, Fe
3O
4And Fe
2O
3) form Fe in the iron scale under the general technology
2O
3Content can be up to 50 (wt) %, Fe
3O
4About content 30 (wt) %, Fe in the iron scale after control techniques is implemented
2O
3Content is reduced to 30 (wt) below the %, Fe
3O
4Content rises to about 40-60 (wt) %.Iron scale and good, the good in integrity of matrix bonding force under the new technology, Fe in the iron scale
3O
4The increase of content, this red stone micromicro increase the atmospheric corrosive power of the anti-seashore of its surface of steel plate greatly, especially suppress the spot corrosion that the cl ions under the water surrounding causes.
Deck of boat storage period generally all is under the seashore atmospheric environment, high humidity, and the cl ions deposition is higher, and the plate face is prone to atomospheric corrosion takes place, and spot corrosion is serious.Therefore, select salt mist experiment simulation seashore atmospheric environment for use, the solidity to corrosion evaluation is carried out on the deck of boat surface under the novel process, and carry out the solidity to corrosion contrast with the deck of boat surface under the general technology.
By the neutral salt spray test method among the GB GB/T 10125-1997 " artificial atmosphere corrosion test-salt-fog test "; Common process and the deck of boat solidity to corrosion of optimizing explained hereafter are analyzed; Experiment condition is following: salt fog the temperature inside the box is set at 35 ℃; Humidity is 100%, and NaCl concentration is 50g/L, collects the liquid measure pH value that falls and is 6.5-7.2.Test period 600h.Experiment material is the deck of boat under the various processes condition, and specimen size 50 * 100 * 2mm carries out ultrasonic oscillation and cleans in acetone, remove surperficial grease.During test non-test face is protected with plastic film, test face is 30 ° of angles with vertical direction, and spacing receives the salt fog that falls to be independent of each other and is as the criterion.After the off-test, sample was taken out about dry half a hour, treat that the corrosion product drying comparatively firmly after; With mobile flushing with clean water surface; Remove sedimentary NaCl, sample is weighed, and utilize pharmaceutical chemicals to wash the corrosion product of surface attachment; Finally draw uniform corrosion speed, the average pit degree of depth and the maximum pit degree of depth.
Embodiment 1:
Like table 1 is iron scale control process parameters among the embodiment 1.Compare with former technology, shorten the slab time inside furnace, improve once oxidation thickness of scale and structure, strengthen one time scale removal effect.Improve finishing temperature, strengthen scale removal effect in the finish rolling process, avoid taking place iron scale and be pressed into, further promote deck of boat surface quality.Utilize weak water-cooled system to increase iron scale and matrix bonding force, and reduce Fe in temperature-fall period
3O
4The too much Fe that is converted into
2O
3, increase Fe in the iron scale
3O
4Content.Table 2 is structures (wt%) of iron scale under the different process, about iron scale thickness 40 μ of CONTROL PROCESS, and Fe in the iron scale
3O
4Content reach 55%, apparently higher than former technology.Table 3 is deck of boat surface salt-fog test post-etching data statisticss under the different process, and the deck of boat surface under the CONTROL PROCESS has the bigger atomospheric corrosion ability of good high chlorine resistant ion content, humidity, and anti-uniform corrosion ability and spot corrosion ability obviously are superior to former technology.This CONTROL PROCESS can prolong the storage period of the deck of boat under the seashore atmospheric environment greatly.
Iron scale control process parameters among table 1 embodiment 1
The structure of iron scale (wt%) under table 2 different process
| Adopting process | Fe 2O 3 | Fe 3O 4 | FeO |
| Former technology | 55 | 25 | 20 |
| CONTROL PROCESS | 22 | 55 | 23 |
Deck of boat surface salt-fog test post-etching data statistics under table 3 different process
| Average corrosion rate/mgcm -2·a -1 | The average pit degree of depth/mm | The maximum pit degree of depth/mm | |
| Former technology | 380.5 | 0.6 | 0.9 |
| CONTROL PROCESS | 220.5 | 0.2 | 0.4 |
Embodiment 2:
Like table 4 are iron scale control process parameters among the embodiment 2.Compare with former technology, shorten the slab time inside furnace, improve once oxidation thickness of scale and structure, strengthen one time scale removal effect.Improve finishing temperature, strengthen scale removal effect in the finish rolling process, avoid taking place iron scale and be pressed into, further promote deck of boat surface quality.Improve and open cold temperature, utilize weak water-cooled system to increase iron scale and matrix bonding force, and reduce Fe in temperature-fall period
3O
4The too much Fe that is converted into
2O
3, increase Fe in the iron scale
3O
4Content.Table 5 is structures (wt%) of iron scale under the different process, about iron scale thickness 40 μ of CONTROL PROCESS, and Fe in the iron scale under the CONTROL PROCESS
3O
4Content reach 50%, apparently higher than former technology.Table 6 is deck of boat surface salt-fog test post-etching data statisticss under the different process, and the deck of boat surface under the CONTROL PROCESS has the bigger atomospheric corrosion ability of good high chlorine resistant ion content, humidity, and anti-uniform corrosion ability and spot corrosion ability obviously are superior to former technology.This CONTROL PROCESS can prolong the storage period of the deck of boat under the seashore atmospheric environment greatly.
Iron scale control process parameters among table 4 embodiment 2
The structure of iron scale (wt%) under table 5 different process
| Adopting process | Fe 2O 3 | Fe 3O 4 | FeO |
| Former technology | 52 | 30 | 18 |
| CONTROL PROCESS | 29 | 50 | 21 |
Deck of boat surface salt-fog test post-etching data statistics under table 6 different process
| Average corrosion rate/mgcm -2·a -1 | The average pit degree of depth/mm | The maximum pit degree of depth/mm | |
| Former technology | 330.5 | 0.45 | 0.8 |
| CONTROL PROCESS | 245.5 | 0.25 | 0.5 |
Claims (5)
1. the control method of the anti-seashore atomospheric corrosion iron scale in deck of boat surface is through control continuously cast bloom composition, improve continuously cast bloom heating cycle, adjustment descaling process, optimize rolling temperature, rationally utilize the ACC water-cooled to control the structure and the thickness of deck of boat scale on surface; It is characterized in that: the following technical parameter of control in technology:
(1) continuously cast bloom Composition Control
C:0.14-0.18%, Si:0.10-0.30%, Mn:0.45-1.50%, Nb:0.005-0.04%, Ti:0.005-0.02%, S :≤0.01%, P≤0.02%, Als:0.02-0.04%, surplus is Fe and unavoidable impurities, is weight percentage;
(2) continuously cast bloom heating cycle
The continuously cast bloom tapping temperature is controlled at 1180-1200 ℃, and time inside furnace is controlled at 260-290min, and the residual Control for Oxygen Content of process furnace is at 1-8%; Improved the once oxidation iron sheet structure, gauge control is at 0.5-2.0mm, reduces pore, and compact structure has improved the separability of iron scale;
(3) descaling process
The chloride ion content of de-scaling water and steel plate inspection water is lower than 100mg/L in the control deck of boat production process, guarantees a de-scaling temperature at 1173-1190 ℃, and each de-scaling point pressure guarantees at 18-21MPa;
(4) rolling pattern
Rough rolling step de-scaling system is taked the odd-numbered pass de-scaling, and rolling pattern is taked to depress greatly, and draught per pass 10-35mm guarantees dynamic recrystallization completely, so that eliminate as-cast structure fully, refine austenite crystal grain;
According to the intensity rank and the thickness specification of the deck of boat, rolling technology, finishing temperature is controlled at 880-990 ℃; Wherein,
Thickness≤20mm steel plate, finishing temperature is at 950-990 ℃;
Thickness>the 20mm steel plate, finishing temperature is at 880-950 ℃; Guarantee to generate a certain amount of FeO before the plate face gets into water cooling stage, in order to improve iron scale plasticity and with the bonding force of matrix;
Thickness≤20mm steel plate finish rolling stage is adopted the 1st passage or the 1st and the 3rd passage de-scaling;
Thickness>the 20mm steel plate finish rolling stage adopts the 3rd and the 5th passage de-scaling, guarantees scale removal effect, avoid since the clean iron scale of de-scaling to be pressed into the plate face that causes coarse;
(5) ACC technology
Roll the back and adopt ACC water-cooled system, the finished product steel plate begins to cool down temperature 850-950 ℃, and final cooling temperature is controlled at 670-750 ℃, and cooling rate is set at 5-15 ℃/s, and the composition that makes iron scale is with Fe
3O
4With FeO be main, improve Fe
3O
4Content has been avoided Fe in temperature-fall period
3O
4The too much Fe that is converted into
2O
3Adopt 1 passage aligning after the water-cooled, avoided the harder Fe in top layer under the prerequisite of assurance template as far as possible
3O
4And Fe
2O
3Sudden and violent is pressed into matrix and causes surperficial pockmark defective.
2. method according to claim 1 is characterized in that: continuously cast bloom Composition Control chemical ingredients is: C:0.15-0.18%, Si:0.10-0.30%; Mn:0.45-1.30%, Nb:0.005-0.02%, Ti:0.005-0.02%; S :≤0.01%, P≤0.02%, Als:0.02-0.04%; Surplus is Fe and unavoidable impurities, is weight percentage.
3. method according to claim 1 is characterized in that: the residual Control for Oxygen Content of process furnace is at 2-6%.
4. method according to claim 1 is characterized in that: thickness≤20mm steel plate directly rolls, and finishing temperature is at 960-980 ℃; Thickness>the 20mm finishing temperature is at 880-920 ℃.
5. method according to claim 1 is characterized in that: steel plate rolls the back and adopts ACC water-cooled system, and cooling rate is set at: 6-10 ℃/s.
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