CN105220077A - For the manufacture of great surface quality hot-rolled steel sheet and the manufacture method of excavator-type shovel clamshell excavator - Google Patents
For the manufacture of great surface quality hot-rolled steel sheet and the manufacture method of excavator-type shovel clamshell excavator Download PDFInfo
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- CN105220077A CN105220077A CN201510767942.7A CN201510767942A CN105220077A CN 105220077 A CN105220077 A CN 105220077A CN 201510767942 A CN201510767942 A CN 201510767942A CN 105220077 A CN105220077 A CN 105220077A
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Abstract
The invention discloses a kind of great surface quality hot-rolled steel sheet for the manufacture of excavator-type shovel clamshell excavator and manufacture method, the chemical element composition contained and weight percent thereof are carbon 0.01 ~ 0.15%, silicon 0.01 ~ 0.20%, manganese 0.20 ~ 2.0%, niobium 0.01 ~ 0.10%, titanium 0.01 ~ 0.15%, nickel≤0.15%, chromium≤0.20%, copper≤0.20%, phosphorus≤0.015%, sulphur≤0.010%, surplus are iron and inevitable impurity; Impurity Sn≤0.03%, plumbous≤0.02%, the content of nickel, chromium, copper meets 0.15%≤Ni+Cr+Cu≤0.35% simultaneously.The steel plate of preparation is made to have good wear resistance, solidity to corrosion, resistance to bend and formability by the content of control Ni+Cr+Cu, and high-intensity performance, the performance requriements of domestic and international excavation machinery manufacturer can be met completely; In addition, controlled by the pH value to coiling temperature in production process and laminar cooling water, chloride ion content and specific conductivity, obtained surface of steel plate is light blue, glossy, and steel plate upper and lower surface does not have the defect such as pit, pit, and namely steel plate has very high surface quality.
Description
Technical field
The invention belongs to manufacture field of low alloy steel, be specifically related to a kind of great surface quality hot-rolled steel sheet for the manufacture of excavator-type shovel clamshell excavator and manufacture method.
Background technology
Large excavator bucket part, because of the Service Environment of its complexity, has strict internal soundness requirement to steel plate.General requirement steel plate mother metal and welding joint have high strength and good wear resistance, solidity to corrosion, resistance to bend and formability simultaneously; Meanwhile, the defects such as surface of steel plate pit, pit, impression not only directly affect the outward appearance of steel plate, more produce certain influence to the effect of spraying paint of downstream endpoint product.Along with construction machinery industry competition, the requirement of Engineering Machinery Components production firm to plate surface quality main is both at home and abroad also more and more higher, except not allowing hot rolled sheet metal surface and occurring the normal defects such as grey black, pit, pit, even require steel plate can within band outside, reach the basic no color differnece of surfaces externally and internally.
Current domestic excavator-type shovel clamshell excavator generally adopts the steel such as Q345, NM360 and HARDOX500, Q345 low price, but performance is general; NM360 and HARDOX500 better performances, but cost is higher.Meanwhile, the emphasis service requirements of great surface quality Ye Shi engineering machinery manufacturer.Therefore, how while meeting plate property requirement, the high-strength hot-rolled sheet producing great surface quality becomes steel mill's problem demanding prompt solution.
As Chinese invention patent (publication number CN1644743, publication date 2005.07.27) discloses the superior high tensile hot rolled steel sheet of a kind of workability, fatigue characteristic and surface quality, it is no more than 0.1% at control Si content, to obtain good plate surface quality; By control P and Cr content, to obtain good workability and fatigue characteristic.Though this kind of method avoids the appearance of surface of steel plate Red Flowers speckle to a certain extent, improve the surface quality of steel plate, but not to batching in whole production process, the link such as water quality and crosscut aligning controls, the defects such as surface of steel plate grey black and pockmark are difficult to avoid, and can not meet the high request of construction machinery industry Surface Quality now.
As Chinese invention patent application (publication number CN102764760, publication date 2012.11.07) discloses a kind of manufacture method of great surface quality hot-rolled steel sheet, it is by controlling below 0.15% by Si content, certain process optimization, process control are carried out to the whole flow process of rolling simultaneously, obtain the hot-rolled steel sheet with high surface quality.But it does not consider the impact of High Strength Steel Plate alloying element on plate surface quality, do not consider that the factors such as water quality, coiling process and crosscut aligning are on the impact of High Strength Steel Plate surface quality simultaneously yet.
Summary of the invention
Object of the present invention is exactly to provide a kind of great surface quality hot-rolled steel sheet for the manufacture of excavator-type shovel clamshell excavator.
For achieving the above object, the technical solution used in the present invention is: for the manufacture of the great surface quality hot-rolled steel sheet of excavator-type shovel clamshell excavator,
The chemical element composition contained and weight percent thereof are: carbon 0.01 ~ 0.15%, silicon 0.01 ~ 0.20%, manganese 0.20 ~ 2.0%, niobium 0.01 ~ 0.10%, titanium 0.01 ~ 0.15%, dissolved aluminum 0.035 ~ 0.050%, nickel≤0.15%, chromium≤0.20%, copper≤0.20%, phosphorus≤0.020%, sulphur≤0.010% and surplus are iron;
Wherein: the content of nickel, chromium, copper meets 0.15%≤Ni+Cr+Cu≤0.35%.
Below sketch the reason of selected alloying element, composition range in the present invention:
C (carbon): content controls within the scope of 0.01 ~ 0.15wt%.Carbon is the principal element improving hardness, intensity and wear resistance, containing more than 0.01wt%, just can guarantee the intensity of steel plate.But too high carbon can reduce the ductility of steel and shaping row, thus in the present invention carbon content control scope at 0.01 ~ 0.15wt%.
Si (silicon): content controls within the scope of 0.005 ~ 0.20wt%.Silicon is the bioelement of deoxidation in steel making, and improves the intensity of steel with solution strengthening form, and content is generally at more than 0.005wt%.As Si>=0.2wt%, with SiO after reacting with O
2form exist, SiO
2easily FeO/Fe is formed again with FeO
2siO
4eutectoid product or become fayalite (2FeSiO
2), FeO/Fe
2siO
4eutectoid product solidify after for anchor-shaped pattern, FeO is difficult to remove; Fayalite is embedded into after in ferric oxide cortex, with the combination of matrix closely, dephosphorize by high pressure water is also difficult to be removed.Control Si:0.005 ~ 0.20wt% in the present invention, is preferably 0.01 ~ 0.20wt%.
Mn (manganese): content controls at 0.20 ~ 2.0wt%.Manganese can be eliminated or weaken because of the red brittleness caused by sulphur, thus improves the hot workability of steel.Mn and iron form sosoloid, improve ferrite and austenitic hardness and intensity in steel, strengthening matrix; Be again carbide forming element simultaneously, enter in cementite and replace a part of iron atom, generate Mn
3c, it and Fe
3c can dissolve mutually, is formed in (FeMn) in steel
3c type compound, thus the intensity of raising steel, hardness and wear resistance.Therefore, the general manganese containing more than 0.10wt%.But the higher meeting of Fe content causes more serious center segregation, and reduces toughness, and manganese is chosen as 0.20 ~ 2.0wt%.
Nb (niobium): content controls at 0.01 ~ 0.10wt%.Niobium crystal grain thinning and dispersion-strengthened can improve intensity, and hardness and wear resistance, below 0.10wt% can reach the effect of crystal grain thinning and dispersion-strengthened.In the present invention, control Nb content is 0.01 ~ 0.10wt%.
Ti (titanium): content controls at 0.01 ~ 0.15wt%.Appropriate titanium generates the TiN particle of disperse under continuous casting cooling conditions, because its fusing point is very high, and can remarkable inhibiting grain growth in welded heat affecting zone.In the present invention, control Ti content is 0.01 ~ 0.15wt%.
Ni (nickel): content controls at≤0.15wt%.The oxidation position of nickel is lower, and the preferential oxidation when being oxidized, can produce Ni enrichment at ferric oxide cortex, form metal twine and the particle of rich Ni, and develop into the very strong adhesion layer of a sticking power gradually, still not easily peel off under the impact of high pressure water.And when also having a small amount of Ni to exist in steel, the thickness of adhesion layer can significantly increase.But Ni can improve solidity to corrosion, improve the hot workability of steel plate.Control Ni content≤0.15wt% in the present invention.
Cr (chromium): content controls at≤0.20wt%.Chromium can make C curve move to right, and chromium can be strengthened postponing ferrite, and perlitic transformation, partly can suppress proeutectoid ferrite, can increase the wear resistance of steel plate simultaneously.But Cr and Ni is similar, easily form refractory oxide, be attached to surface of steel plate, still not easily peel off under the impact of high pressure water.Therefore, chromium is chosen as≤0.20wt%.
Cu (copper): content controls at≤0.20wt%.Cu element reinforced ferrite in steel, Cu has vital role to the solidity to corrosion improving steel simultaneously, and Cu and Ni is similar, and Cu is enriched in iron scale and metal collective phase interface, hot-rolled sheet surface can be made to occur irregular surface crack, so should the content of strict control Cu.Therefore Cu is chosen as≤0.20wt%.
Meanwhile, Ni+Cr+Cu controls the level at 0.15 ~ 0.35wt%, and this level can ensure the wear resistance of steel plate, solidity to corrosion and shaping row, and when Ni+Cr+Cu is more than 0.35wt% simultaneously, plate surface quality obviously declines.
The present invention also provides a kind of manufacture method for the manufacture of excavator-type shovel clamshell excavator steel plate as described above, comprises the following steps:
1) smelt, cast
Strand is prepared by described composition and weight percent;
2) rolling
After slab heating temperature 1230 ~ 1270 DEG C, heat-up time 150 ~ 200min, adopt two-phase control rolling, the roughing of austenite recrystallization district, accumulative draft >=55%, Unhydrated cement finish rolling, accumulative draft >=50%;
3) cool, batch
Adopt section cooling after rolling, oiler temperature control is between 450 ~ 560 DEG C;
Wherein: laminar cooling water pH value is 7 ~ 9,0mg/l≤Cl
-≤ 300mg/l, 0ms/cm≤specific conductivity≤2.5ms/cm.
4) uncoiling is slightly rectified, smart counterfeiting an emperor's order obtains required steel plate.
Wherein: strand time inside furnace is unsuitable long, and time inside furnace controls at 150 ~ 200min, to reduce the thickness of once oxidation iron sheet.
In order to fining ferrite grains, when the high temperature roughing of austenite recrystallization district, carry out the rolling of multi-pass aximal deformation value, ensure large draught, make austenite crystal fully broken, the end temp of roughing simultaneously should in perfect recrystallization district, can not entering part recrystallization zone, in order to avoid produce mixed crystal.Carry out continuous finish rolling at Unhydrated cement, austenite crystal is fully flattened, produce a large amount of dislocation at intra-die, form slip band and born of the same parents' shape substructure, for providing more forming core point during ferritic transformation, with fining ferrite grains, increase the nucleation site of precipitated phase simultaneously.
Roll rear employing section cooling simultaneously, ensure certain speed of cooling and suitable final cooling temperature, for the precipitation strength of microalloy element creates conditions.Wherein: laminar cooling water pH value controls 7 ~ 9, the pH value in water is a factor very large to metallic corrosion rate.Cathodic process is hydrionic reduction process, then in general pH value reduction is conducive to the carrying out of process thus accelerates corrosion of metal; 0mg/l≤Cl in laminar cooling water
-≤ 300mg/l, when the chloride ion content in water is too high, has corrosive nature to equipment, metallic conduit and structures, and the permutoid reaction of the strong promotion of energy and promotion metallic surface electronics causes the corrosive catalyzer of water quality; 0ms/cm≤specific conductivity≤2.5ms/cm: specific conductivity is too high, accelerates corrosion of metal equally, makes surface of steel plate occur the defects such as pit.
Oiler temperature control is between 450 ~ 560 DEG C.Oiler temperature control can be measured with FeO in minimizing scale structure by controlled oxidization thickness of scale below 560 DEG C, increases and the compact eutectoid Fe of matrix
3o
4measure with α-Fe.Surface of steel plate iron scale is finer and close, and be combined comparatively firm with steel matrix, thinner thickness a bit.If coiling temperature is higher, surface of steel plate grey black obviously increases.Consider the work capacity of reeling machine and the mechanical property of steel plate, oiler temperature control is more than 450 DEG C.
Further, described step 4) in thick rectify before remove FeO by brush roll and to come off the black powder formed, essence prevents foreign matter to be pressed into steel plate by blow device before rectifying.
Compared with prior art, the present invention has the following advantages: by the control to Ni+Cr+Cu alloy content, steel plate of the present invention not only yield strength Rel is 600 ~ 750MPa, tensile strength Rm >=670MPa, unit elongation A >=24%, horizontal sample impact absorbing energy KV2 >=70J at-30 DEG C, also has great surface quality; Namely steel plate of the present invention has good wear resistance, solidity to corrosion, resistance to bend and formability, and high-intensity performance, can meet the performance requriements of domestic and international excavation machinery manufacturer completely;
By the control to Ni+Cr+Cu alloy content, and controlled by the pH value to coiling temperature, laminar cooling water in production process, chloride ion content and specific conductivity simultaneously, obtained surface of steel plate is light blue, glossy, steel plate upper and lower surface does not have the defect such as pit, pit, and namely steel plate has very high surface quality.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, is convenient to more clearly understand the present invention, but they do not form restriction to the present invention.
According to chemical element composition of the present invention, weight percent when production method requirement, four embodiments are prepared, and three comparative examples, be respectively embodiment 1, embodiment 2, embodiment 3, embodiment 4, comparative example 1, comparative example 2, comparative example 3, namely smelt also rolling 7 batches of steel plates.The chemical element composition by weight percent of four embodiments and three comparative examples is in table 1, and wherein surplus is Fe.Production process controling parameters and plate quality situation are in table 2.
Chemical composition contrast (wt%) of table 1 four embodiments and three comparative examples
Table 2 four embodiments and three comparative example's production processes control and plate quality situation
As can be seen from Table 2, work as Si>0.2wt%, the grey black showed increased of surface of steel plate, and occur more pockmark; When Ni+Cr+Cu is more than 0.35wt%, unit elongation and-30 DEG C of ballistic works of steel plate decrease, and the grey black of surface of steel plate is more, and pit, pit increase greatly.When the control of rolling technology and laminar cooling water exceeds setting range of the present invention, plate surface quality obviously declines.
Claims (3)
1. for the manufacture of a great surface quality hot-rolled steel sheet for excavator-type shovel clamshell excavator, it is characterized in that: the chemical element composition contained and weight percent thereof are: carbon 0.01 ~ 0.15%, silicon 0.01 ~ 0.20%, manganese 0.20 ~ 2.0%, niobium 0.01 ~ 0.10%, titanium 0.01 ~ 0.15%, dissolved aluminum 0.035 ~ 0.050%, nickel≤0.15%, chromium≤0.20%, copper≤0.20%, phosphorus≤0.020%, sulphur≤0.010% and surplus are iron;
Wherein: the content of nickel, chromium, copper meets 0.15%≤Ni+Cr+Cu≤0.35%.
2., as claimed in claim 1 for the manufacture of a manufacture method for excavator-type shovel clamshell excavator great surface quality hot-rolled steel sheet, it is characterized in that: comprise the following steps:
1) smelt, cast
Strand is prepared by described composition and weight percent;
2) rolling
After slab heating temperature 1230 ~ 1270 DEG C, heat-up time 150 ~ 200min, adopt two-phase control rolling, the roughing of austenite recrystallization district, accumulative draft >=55%, Unhydrated cement finish rolling, accumulative draft >=50%;
3) cool, batch
Adopt section cooling after rolling, oiler temperature control is between 450 ~ 560 DEG C;
Wherein: laminar cooling water pH value is 7 ~ 9,0mg/l≤Cl
-≤ 300mg/l, 0ms/cm≤specific conductivity≤2.5ms/cm.
4) uncoiling is slightly rectified, smart counterfeiting an emperor's order obtains required steel plate.
3. the manufacture method for the manufacture of excavator-type shovel clamshell excavator great surface quality hot-rolled steel sheet according to claim 2, it is characterized in that: described step 4) in thick rectify before remove FeO by brush roll and to come off the black powder formed, essence prevents foreign matter to be pressed into steel plate by blow device before rectifying.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106367681A (en) * | 2016-12-02 | 2017-02-01 | 中铁物总技术有限公司 | Preparation process method of low-cost and ultra-low carbon steel plate for railway cars |
| CN106566986A (en) * | 2016-11-10 | 2017-04-19 | 武汉钢铁股份有限公司 | High surface quality hot rolled steel plate used for manufacturing swing arm of excavator, and manufacturing method thereof |
| CN106702270A (en) * | 2016-11-10 | 2017-05-24 | 武汉钢铁股份有限公司 | Thick-specification high-surface-quality hot-rolling and straightening steel sheet and manufacturing method thereof |
| CN106964651A (en) * | 2017-04-10 | 2017-07-21 | 首钢总公司 | A kind of method for preventing coil of strip corrosion |
| CN110042309A (en) * | 2019-05-07 | 2019-07-23 | 南京钢铁股份有限公司 | A kind of production method improving wide surface of thin steel sheet quality |
| CN112041468A (en) * | 2018-02-23 | 2020-12-04 | 瓦卢莱克德国有限公司 | High tensile strength and high toughness steel |
| CN112139244A (en) * | 2019-06-26 | 2020-12-29 | 上海梅山钢铁股份有限公司 | Rolling method for eliminating surface oxygen spot defect of hot-rolled and acid-washed enameled steel plate |
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Cited By (10)
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| CN106566986A (en) * | 2016-11-10 | 2017-04-19 | 武汉钢铁股份有限公司 | High surface quality hot rolled steel plate used for manufacturing swing arm of excavator, and manufacturing method thereof |
| CN106702270A (en) * | 2016-11-10 | 2017-05-24 | 武汉钢铁股份有限公司 | Thick-specification high-surface-quality hot-rolling and straightening steel sheet and manufacturing method thereof |
| CN106702270B (en) * | 2016-11-10 | 2018-05-08 | 武汉钢铁有限公司 | Think gauge great surface quality hot rolling opening plate and its manufacture method |
| CN106367681A (en) * | 2016-12-02 | 2017-02-01 | 中铁物总技术有限公司 | Preparation process method of low-cost and ultra-low carbon steel plate for railway cars |
| CN106367681B (en) * | 2016-12-02 | 2018-10-26 | 中铁物总技术有限公司 | A kind of process of preparing of low cost Ultra-low carbon train wagon steel plate |
| CN106964651A (en) * | 2017-04-10 | 2017-07-21 | 首钢总公司 | A kind of method for preventing coil of strip corrosion |
| CN106964651B (en) * | 2017-04-10 | 2020-05-22 | 首钢集团有限公司 | Method for preventing steel coil from rusting |
| CN112041468A (en) * | 2018-02-23 | 2020-12-04 | 瓦卢莱克德国有限公司 | High tensile strength and high toughness steel |
| CN110042309A (en) * | 2019-05-07 | 2019-07-23 | 南京钢铁股份有限公司 | A kind of production method improving wide surface of thin steel sheet quality |
| CN112139244A (en) * | 2019-06-26 | 2020-12-29 | 上海梅山钢铁股份有限公司 | Rolling method for eliminating surface oxygen spot defect of hot-rolled and acid-washed enameled steel plate |
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