CN105220077B - High surface quality hot rolled steel plate for manufacturing excavator bucket and manufacturing method - Google Patents
High surface quality hot rolled steel plate for manufacturing excavator bucket and manufacturing method Download PDFInfo
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Abstract
The invention discloses a high surface quality hot rolled steel plate for manufacturing an excavator bucket and a manufacturing method. The steel plate comprises, by weight, 0.01-0.15% of carbon, 0.01-0.20% of silicon, 0.20-2.0% of manganese, 0.01-0.10% of niobium, 0.01-0.15% of titanium, less than or equal to 0.15% of nickel, less than or equal to 0.20% of chromium, less than or equal to 0.20% of copper, less than or equal to 0.015% of phosphorus, less than or equal to 0.010% of sulfur and the balance iron and unavoidable impurities, wherein the content of the impurity tin is less than or equal to 0.03%, the content of the impurity lead is less than or equal to 0.02%, and meanwhile the total content of nickel, chromium and copper is greater than or equal to 0.15% and less than or equal to 0.35%. According to the high surface quality hot rolled steel plate for manufacturing the excavator bucket and the manufacturing method, by controlling the total content of nickel, chromium and copper, the prepared steel plate has good abrasion resistance, corrosion resistance, bending resistance and formability and high strength performance, and performance requirements of excavating machinery manufacturers at home and abroad can be satisfied completely; in addition, by controlling the crimping temperature, the pH value of laminar flow cooling water, the content of chloride ions and the conductivity in the production process, the surface of the obtained steel plate is in baby blue and glossy, and no defects such as dents or hard spots exist on the upper surface and the lower surface of the steel plate, in another word, the steel plate has high surface quality.
Description
Technical field
The invention belongs to manufacture field of low alloy steel, and in particular to a kind of great surface quality for manufacturing excavator-type shovel clamshell excavator
Hot rolled steel plate and manufacture method.
Background technology
Large excavator bucket part, because of its complicated Service Environment, there is strict internal soundness to require to steel plate.One
As require that steel plate mother metal and welding point have high intensity and good wearability, corrosion resistance, bending resistance and mouldability simultaneously；
Meanwhile, the defect such as surface of steel plate pit, pit, impressing not only directly affects the outward appearance of steel plate, more to the spray of downstream endpoint product
Paint effect produces certain impact.With construction machinery industry competition, both at home and abroad main Engineering Machinery Components life
Requirement of the manufacturer to plate surface quality also more and more higher is produced, grey black, pit, pit occurs except not allowing hot rolled sheet metal surface
Outside Deng normal defect, or even require that steel plate can band be outer with, reach the substantially colorless difference of surfaces externally and internally.
At present country's excavator-type shovel clamshell excavator is generally using steel such as Q345, NM360 and HARDOX500, Q345 low prices, but
Performance is general；NM360 and HARDOX500 better performances, but it is relatively costly.Meanwhile, great surface quality is also engineering machinery manufacturer
Emphasis use requirement.Therefore, how while plate property requirement is met, the high-strength hot rolled plate of great surface quality is produced
Become steel mill's problem demanding prompt solution.
As Chinese invention patent (publication number CN1644743, publication date 2005.07.27) discloses a kind of machinability, tired
The superior high tensile hot rolled steel sheet of labor characteristic and surface quality, it is less than 0.1%, to obtain preferably in control Si contents
Plate surface quality；By controlling P and Cr contents, to obtain preferable machinability and fatigue properties.Though this kind of method is one
Determine the appearance that surface of steel plate redness mottlrd figure is avoided in degree, improve the surface quality of steel plate, but not to entirely producing
Batch in journey, the link such as water quality and crosscutting aligning is controlled, the defect such as surface of steel plate grey black and pockmark is difficult to avoid, it is impossible to full
The high request of sufficient construction machinery industry Surface Quality now.
As Chinese invention patent application (publication number CN102764760, publication date 2012.11.07) discloses a kind of high table
The manufacture method of face quality hot rolled steel plate, it is by the way that Si contents are controlled below 0.15%, while entering to rolling whole flow process
Row certain process optimization, process control, obtain the hot rolled steel plate with high surface quality.But it does not consider high-strength steel
Impact of the plate alloying element to plate surface quality, while also not considering the factors such as water quality, coiling process and crosscutting aligning to height
The impact of strong plate surface quality.
The content of the invention
Present invention aim to provide a kind of great surface quality hot rolled steel plate for manufacturing excavator-type shovel clamshell excavator.
For achieving the above object, the technical solution used in the present invention is：For manufacturing the great surface quality of excavator-type shovel clamshell excavator
Hot rolled steel plate,
The chemical element component and its percentage by weight for containing be：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 balance of iron；
Wherein：Nickel, chromium, the content of copper meet 0.15%≤Ni+Cr+Cu≤0.35%.
The reasons why alloying element, composition range being selected in the present invention described briefly below：
C (carbon)：Content is controlled in the range of 0.01～0.15wt%.Carbon is the main of raising hardness, intensity and wearability
Element, containing more than 0.01wt%, just can ensure that the intensity of steel plate.But too high carbon can reduce the ductility of steel and shaping row, therefore
Carbon content control scope is in 0.01～0.15wt% in the present invention.
Si (silicon)：Content is controlled in the range of 0.005～0.20wt%.Silicon is the essential elements of deoxidation in steel making, and with solid
Molten augmented form improves the intensity of steel, and content is typically in more than 0.005wt%.As Si >=0.2wt%, after reacting with O
With SiO2In the form of, SiO2Easily form FeO/Fe with FeO again2SiO4Eutectoid product or into fayalite (2FeSiO2),
FeO/Fe2SiO4The solidification of eutectoid product after be anchor-shaped pattern, FeO is very difficult to remove；Fayalite is embedded in iron oxide cortex
Afterwards, and matrix combination closely, water under high pressure dephosphorization also is difficult to be removed.Si is controlled in the present invention：0.005～
0.20wt%, preferably 0.01～0.20wt%.
Mn (manganese)：Content is controlled in 0.20～2.0wt%.Manganese can be eliminated or weakened because of the red brittleness caused by sulphur, so as to
Improve the hot-working character of steel.Mn and iron form solid solution, improve the hardness and intensity of ferrite and austenite in steel, strengthen base
Body；It is again simultaneously carbide former, a part of iron atom is replaced in cementite, generates Mn3C, it and Fe3C can be mutually
Dissolving, is formed in (Fe Mn) in steel3C-type compound, so as to improve intensity, hardness and the wearability of steel.Therefore, typically contain
There is the manganese of more than 0.10wt%.But manganese content is higher to cause more serious center segregation, and reduces toughness, manganese selects to be 0.20
～2.0wt%.
Nb (niobium)：Content is controlled in 0.01～0.10wt%.Niobium can crystal grain thinning and dispersion-strengtherning improve intensity, hardness and
Wearability, below 0.10wt% can reach the effect of crystal grain thinning and dispersion-strengtherning.Nb contents are controlled in the present invention for 0.01
～0.10wt%.
Ti (titanium)：Content is controlled in 0.01～0.15wt%.Appropriate titanium generates the TiN of disperse under continuous casting cooling condition
Particle, because its fusing point is very high, can significantly inhibit crystal grain and grow up in welding heat affected zone.Ti contents are controlled in the present invention is
0.01～0.15wt%.
Ni (nickel)：Content is controlled in≤0.15wt%.The oxidation position of nickel is relatively low, the preferential oxidation in oxidation, in iron oxide
Cortex can produce Ni enrichments, form the metal twine and particle of richness Ni, and be gradually evolved into a very strong adhesion layer of adhesive force,
Still it is not easily stripped under the impact of water under high pressure.And work as and also have in steel in the presence of a small amount of Ni, the thickness of adhesion layer can significantly increase.
But Ni can improve corrosion resistance, the hot-workability of steel plate is improved.Ni contents≤0.15wt% is controlled in the present invention.
Cr (chromium)：Content is controlled in≤0.20wt%.Chromium moves to right can C curve, and chromium can be strengthened postponing ferrite, pearlite
Transformation, can partly suppress pro-eutectoid ferrite, while the wearability of steel plate can be increased.But Cr is similar with Ni, infusibility is easily formed
Oxide, is attached to surface of steel plate, is still not easily stripped under the impact of water under high pressure.Therefore, chromium is selected as≤0.20wt%.
Cu (copper)：Content is controlled in≤0.20wt%.Cu elements reinforced ferrite in steel, while Cu is to improving steel
Corrosion resistance has important function, and Cu is similar with Ni, and Cu is enriched in iron scale and metal collective boundary, can make hot rolling plate surface
There is irregular face crack, so the content of Cu should be controlled strictly.Therefore Cu is selected as≤0.20wt%.
Meanwhile, Ni+Cr+Cu controls the level in 0.15～0.35wt%, and this level can ensure the wearability of steel plate, anti-corrosion
Property and shaping row, while when Ni+Cr+Cu is more than 0.35wt%, plate surface quality is decreased obviously.
The present invention also provides a kind of manufacture method for manufacturing excavator-type shovel clamshell excavator steel plate as described above, including following step
Suddenly：
1) smelt, cast
Strand is prepared by the composition and percentage by weight；
2) roll
After 1230～1270 DEG C of slab heating temperature, 150～200min of heat time, using two-phase control rolling, austenite
Recrystallization zone roughing, adds up reduction ratio >=55%, and Unhydrated cement finish rolling adds up reduction ratio >=50%；
3) cool down, batch
Section cooling is adopted 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≤electrical 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 is controlled in 150～200min, to reduce once oxidation iron
The thickness of skin.
For fining ferrite grains, in austenite recrystallization area during high temperature roughing, multi-pass aximal deformation value rolling is carried out,
Ensure big drafts, austenite crystal is fully crushed, while roughing end temp should be in perfect recrystallization area, it is impossible to enter
Partial, re-crystallization area, in order to avoid produce mixed crystal.Continuous finish rolling is carried out in Unhydrated cement, austenite crystal is fully flattened, in crystalline substance
Intragranular portion produces a large amount of dislocations, forms glide band and born of the same parents' shape substructure, for ferritic transformation when more forming core points are provided, with thin
Change ferrite crystal grain, while increasing the nucleation site of precipitated phase.
Using section cooling roll simultaneously after, it is ensured that certain cooling velocity and suitable final cooling temperature, are microalloy element
Precipitation strength create conditions.Wherein：Laminar cooling water pH value is controlled 7～9, and the pH value in water is to metal erosion speed shadow
A very big factor of sound.Cathodic process is hydrionic reduction process, then pH value reduces in general being conducive to entering for process
Go so as to accelerate corrosion of metal；0mg/l≤Cl in laminar cooling water-≤ 300mg/l, the chloride ion content in water is too high
When, there is corrosiveness to equipment, metallic conduit and structures, the strong promotion of energy and the exchange of promotion metal surface electronics are anti-
Should, it is to cause the corrosive catalyst of water quality；0ms/cm≤electrical conductivity≤2.5ms/cm：Electrical conductivity is too high, equally accelerates gold
The corrosion of category, makes surface of steel plate the defects such as pit occur.
Oiler temperature control is between 450～560 DEG C.Oiler temperature control can control iron scale below 560 DEG C
FeO amounts in thickness and reduction scale structure, increase and the compact eutectoid Fe of matrix3O4With α-Fe amounts.Surface of steel plate oxygen
Change iron sheet it is finer and close, combined with steel matrix it is stronger, thinner thickness a bit.If coiling temperature is higher, surface of steel plate grey black is bright
It is aobvious to increase.The mechanical property of ability to work and steel plate in view of coiling machine, oiler temperature control is more than 450 DEG C.
Further, the step 4) in it is thick rectify before FeO removed by brush roll come off the black powder to be formed, essence passes through to blow before rectifying
Sweeping device prevents foreign matter to be pressed into steel plate.
Compared with prior art, the present invention has advantages below：By the control to Ni+Cr+Cu alloy contents, the present invention
Steel plate not only yield strength Rel be 600～750MPa, tensile strength Rm >=670MPa, elongation percentage A >=24%, horizontal sample
Impact absorbing energy KV2 >=70J at -30 DEG C, also with great surface quality；Steel plate i.e. of the invention have good wearability,
Corrosion resistance, bending resistance and mouldability, and high-intensity performance, can meet completely the property of domestic and international excavation machinery manufacturer
Can require；
By the control to Ni+Cr+Cu alloy contents, and while by coiling temperature, laminar flow during production technology
The pH value of cooling water, chloride ion content and electrical conductivity are controlled, obtained surface of steel plate in light blue, glossy, on steel plate
Lower surface does not have the defects such as pit, pit, i.e. steel plate to have very high surface quality.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, is easy to more clearly understand the present invention, but it
Not to the present invention constitute limit.
According to chemical element component of the present invention, weight percent, when production method is required, is prepared for four embodiments, and
Three comparative examples, respectively embodiment 1, embodiment 2, embodiment 3, embodiment 4, comparative example 1, comparative example 2,
Comparative example 3, that is, smelt and rolled 7 batches of steel plates.Four embodiments and the chemical element component weight of three comparative examples
Amount percentage is shown in Table 1, wherein balance of Fe.Production process control parameter is shown in Table 2 with plate quality situation.
1 four embodiments of table and chemical composition contrast (wt%) of three comparative examples
2 four embodiments of table and three comparative example's production process controls and plate quality situation
As can be seen from Table 2, Si is worked as>0.2wt%, the grey black showed increased of surface of steel plate, and there is more pockmark；Work as Ni+
When Cr+Cu is more than 0.35wt%, the elongation percentage of steel plate and -30 DEG C of ballistic works decrease, and the grey black of surface of steel plate is more, recessed
Hole, pit are greatly increased.When the control of rolling mill practice and laminar cooling water is beyond the setting range of the present invention, surface of steel plate matter
Amount is decreased obviously.
Claims (2)
1. a kind of great surface quality hot rolled steel plate for manufacturing excavator-type shovel clamshell excavator, it is characterised in that：The chemical element for containing into
Divide and its percentage by weight is：Carbon 0.01～0.10%, silicon 0.13～0.20%, manganese 1.39～2.0%, niobium 0.01～
0.10%th, 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 balance of iron；
Wherein：Nickel, chromium, the content of copper meet 0.15%≤Ni+Cr+Cu≤0.35%.
2. a kind of manufacture method for being used to manufacture excavator-type shovel clamshell excavator great surface quality hot rolled steel plate as claimed in claim 1, it is special
Levy and be：Comprise the following steps：
1) smelt, cast
Strand is prepared by the composition and percentage by weight；
2) roll
After 1230～1270 DEG C of slab heating temperature, 150～200min of heat time, using two-phase control rolling, austenite is tied again
Crystalline region roughing, adds up reduction ratio >=55%, and Unhydrated cement finish rolling adds up reduction ratio >=50%；
3) cool down, batch
Section cooling is adopted 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≤electrical conductivity≤2.5ms/cm；
4) uncoiling is slightly rectified, smart counterfeiting an emperor's order obtains required steel plate；
The step 4) in it is thick rectify before FeO removed by brush roll come off the black powder to be formed, essence is rectified and front prevents different by blow device
Thing is pressed into steel plate.
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| 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 |
| CN106566986B (en) * | 2016-11-10 | 2019-01-25 | 武汉钢铁有限公司 | For manufacturing the great surface quality hot rolled steel plate and manufacturing method of excavator swing arm |
| 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 |
| CN106964651B (en) * | 2017-04-10 | 2020-05-22 | 首钢集团有限公司 | Method for preventing steel coil from rusting |
| ES2922300T3 (en) * | 2018-02-23 | 2022-09-13 | Vallourec Deutschland Gmbh | High strength and high toughness steels |
| 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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| JPH0551691A (en) * | 1991-03-11 | 1993-03-02 | Sumitomo Metal Ind Ltd | Wear resistant steel sheet excellent in delayed fracture resistance and its production |
| JPH06248386A (en) * | 1993-02-26 | 1994-09-06 | Sumitomo Metal Ind Ltd | Steel for machine structure excellent in delayed fracture resistance |
| JP5380892B2 (en) * | 2007-05-29 | 2014-01-08 | Ｊｆｅスチール株式会社 | Wear-resistant steel plate with excellent workability and method for producing the same |
| CN104593687B (en) * | 2015-01-22 | 2016-09-28 | 首钢总公司 | The manufacture method of a kind of hot rolling high-strength wearable steel plate and hot rolling high-strength wearable steel plate |
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