CN105779867B - A kind of Cutting free wear-resisting steel plate and preparation method thereof - Google Patents
A kind of Cutting free wear-resisting steel plate and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of Cutting free wear-resisting steel plate and preparation method thereof, by percentage to the quality, the chemical composition of the steel plate is included：C：0.25 0.32%, Si：0.15 0.45%, Mn：1.00 1.30%, P≤0.025%, S：0.010 0.020%, Ti：0.012 0.040%, Cr：0.25 0.50%, B：0.0005 0.0030%, Al：0.010 0.040%, N≤0.004%, O≤0.003%, H≤0.0002%, remaining is Fe and is inevitably mingled with that wherein Ti and N content meet Ti/N=3~8；P and S contents meet P+S≤0.040%.The present invention passes through the scientific and reasonable design to alloying component, product adds temper after rolling through quenching, obtained wear-resisting steel plate thickness is between 8 70mm, Brinell hardness is between HBW430 520, tensile strength is more than 1350MPa, and technique is simple, and cost is low, product hardness is high, intensity is high and is easy to cutting, especially solves the high-leveled and difficult industry problem in processing of hardness high intensity.It can be widely applied to requiring on the products such as high hardness, intensity height, the engineering machinery knife edge board for being easy to machining.
Description
Technical field
The invention belongs to steel plate technical field of smelting, in particular it relates to a kind of Cutting free wear-resisting steel plate and its system
Preparation Method.
Background technology
Wear-resisting steel plate is widely used in engineering, mining, building, manufacture of cement, harbour, electric power and the smelting of high-wear resistance
On the engineering goods such as gold, such as mine dump truck, bull-dozer, loading machine, excavator, dumper and various mining machineries, grab bucket, heap
Reclaimer, conveying warp architecture etc..Current existing wear-resisting steel plate product both at home and abroad, especially HBW430-520 hardness interval is resistance to
Grind steel plate, only with the characteristics of intensity is high, hardness is high, this just directly result in such product directly result in when in use cutting plus
Work difficulty is big, while causing Product processing cost high, is unfavorable for extensive use.
It is well known that the machinability of generally steel increases with increasing for sulfur content in steel, the cutting of steel is also judged with this
Process complexity.Before making the present invention, " a kind of high-strength abrasion-proof steel plate and its preparation side of Wuyang Iron And Steel Co., Ltd application
Method " Chinese patent application (publication number CN101451220A), the steel hardness is NM400 ranks, is less than between HBW360-440
Hardness HBW430-520；The noble elements such as Ni, Nb, V are added simultaneously, and manufacturing cost is high；Steel S≤0.010%, machining is difficult
Degree is big.
" a kind of low-alloy high-strength high-toughness wear-resistant steel plate and its preparation side of Baoshan Iron ＆ Steel Co., Ltd's application
Method " Chinese patent (publication number CN101775545A), although the steel hardness is not less than HBW450, chemical composition with the addition of valuable
Alloy Elements Mo and Nb, this allows for production cost and greatly increased；While steel S ＜ 0.010%, it is therefore apparent that the steel is only
Focus on the raising of hardness and intensity, have ignored cutting and processing characteristics.
A kind of " low-carbon low-alloy abrasion-resistant steel and its production method " Chinese patent of Angang Stock Co., Ltd's application is (open
Number CN102021492A), although belonging to expensive containing elements such as Ni, Nb, Mo in steel Brinell hardness ＞ HB400, chemical composition
Heavy metal, can cause production cost significantly to raise.While steel S≤0.010%, it is therefore apparent that the steel is also only to focus on
The raising of hardness and intensity, have ignored cutting and processing characteristics.
A kind of " high-grade wear-resistant steel plate and its production method " Chinese patent of Wuyang Iron ＆ Steel Co., Ltd.'s application
(publication number CN101748346A), although the steel Brinell hardness is between 445HBW-485HBW, but steel chemical composition Ni contents
For 0.10-0.30%, the element belongs to precious alloy, and production cost is high.While steel S≤0.005%, it is therefore apparent that the steel
Also it is only the raising for having focused on hardness and intensity, is degrading machinability.
The content of the invention
It is full it is an object of the present invention to provide a kind of Cutting free wear-resisting steel plate for the above-mentioned deficiency of prior art
Sufficient user is to thickness between 8-70mm, and between the Brinell hardness 430-520 of surface, tensile strength is in the high-strength of more than 1350MPa
The need for spending wear-resisting steel plate Cutting free easy processing.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of Cutting free wear-resisting steel plate, by mass percentage, the chemical composition of the wear-resisting steel plate is：
C：0.25-0.32%, Si：0.15-0.45%, Mn：1.00-1.30%, P≤0.025%, S：0.010-
0.020%th, Ti：0.012-0.040%, Cr：0.25-0.50%, B：0.0005-0.0030%, Al：0.010-0.040%, N
≤ 0.004%, O≤0.003%, H≤0.0002%, remaining is Fe and is inevitably mingled with, and wherein Ti and N content are met
Ti/N=3~8；P and S contents meet P+S≤0.040%, in order to ensure the cutting ability S contents under the conditions of high strength and high hardness
0.015C+0.0011Mn+0.022Cr+1.3B≤S≤0.04C+0.0021Mn+0.013Cr+0.09B should be met.
The steel plate thickness is between 8-70mm, Brinell hardness between HBW430-520, tensile strength is more than
1350MPa。
Present invention also offers a kind of preparation method of Cutting free wear-resisting steel plate, this method includes：
1) smelting process：Molten steel containing each element is first passed through into desulfurizing iron, converter smelting is sent, is re-fed into LF refining furnace
Refining, can take addition sulphur iron or feeding sulphur line adjustment sulfur content, after refining is finished, carry out at vacuum degassing furnace (RH stoves) vacuum
Reason；
2) casting process：By step 1) molten steel after processing send conticaster, and continuous casting is used using whole argon gas protective casting
Soft reduction technique ensures Inner Quality of Billet, and casting degree of superheat control is within 30 DEG C；
3) heating technique：Slab heating temperature is 1160~1220 DEG C, and the heating reference time is thick by 8-10min/cm slabs
Degree is grilled thoroughly with ensureing that steel billet burning is even, and soaking time is no less than 60min, is rolled after heating；
4) rolling mill practice：Using wide and heavy plate mill complete two-phase control rolling, rough rolling step carry out >=1000 DEG C completely again
Crystallization rolling.Finish rolling stage start rolling temperature is controlled at 880-980 DEG C, and cooling is controlled after rolling, and final cooling temperature is controlled in 150-
Between 660 DEG C, after steel plate cooling, steel plate is aligned depending on plate shape situation, eventually strong temperature >=450 DEG C；
5) Technology for Heating Processing：Quenching temperature is 880-940 DEG C, and the stove inside holding time is 10-25min, steel plate heating
Water quenching afterwards, temperature is 150-350 DEG C, soaking time 15-25min, air cooling after insulation.
Present component design principle：
(1) carbon C is most basic element in steel, can improve the intensity and hardness of steel, and then improves the wearability of steel, by
In the present invention primarily to obtain the martensite wear resistant steel of good quenching degree, but the toughness and welding of higher carbon content to steel
Performance is unfavorable.Therefore, the scientific and reasonable carbon content that must be controlled in steel is 0.25-0.32%, within this range, with carbon content
Increase, the also corresponding increase such as intensity and hardness；
(2) silicon Si is present in austenite with the form of solid solution, the intensity of solid solution in steel is improved, so as to improve steel
Anti-wear performance, but silicone content is too high to significantly reduce the plasticity, toughness and ductility of steel.Simultaneously in view of the affinity of silicon and oxygen
It is stronger than iron, the mobility of the silicate of low melting point, increase slag and fusing metal is easily produced during welding, weldquality is influenceed,
Therefore strictly to control to control silicone content to be 0.15-0.45% in the content of silicon, the present invention；
(3) manganese Mn and iron formation solid solution can improve ferrite and austenite in steel hardness and intensity (hardness of steel with
Manganese content is improved and ramped), strongly increase and be easy to get after the quenching degree of steel, quenching to martensitic structure.Because the reinforcing of manganese is made
With enabling matrix and carbide to strengthen, so that the intensity and hardness of steel are improved, but Mn is superheated susceptivity element, is added during quenching
Hot temperature is too high to cause coarse grains.Mn segregation coefficients in solidification are larger, it is easy to which, in Grain Boundary Segregation, the performance to steel is produced
Raw adverse effect, and remained austenite content increase in quenching structure can be caused, while manganese content height can be made to steel plate welding performance
Into adverse effect.Therefore, the present invention controls manganese content to be 1.00-1.30%；
(4) when contents of the phosphorus P in steel is higher, Fe is formed2P is separated out around crystal grain, reduces the plasticity and toughness of steel, therefore
General control within 0.025%, preferably 0.015% within；
(5) sulphur S forms manganese sulfide inclusion in steel with manganese and iron, and this type impurity can interrupt the continuity of parent metal,
Promote chip breaking to form small and short crimp radius in cutting, and be easy to exclude, reduce tool wear, reduce roughness of machining surface
Degree, improves cutter life, realizes Cutting free.The machinability of usual steel increases with increasing for sulfur content in steel.But sulphur in steel
During too high levels, red brittleness can be caused, the hot-working to steel causes difficulty, deteriorates the mechanical property of steel.Therefore, present invention control
Sulfur content is 0.010-0.020%；
(6) titanium Ti can prevent welding heat affected zone brilliant with crystal grain thinning, improvement toughness, the undissolved property of TiN at high temperature
The roughening of grain, improves the toughness of heat affected area, so that improve the welding performance of abrasion-resistant stee, but Ti contents excessively can be in casting process
In there is liquid precipitation, in strand produce bulky grain TiN, deteriorate steel integrated performance index.Therefore, Ti content in the present invention
Control is in 0.012-0.040%；
(7) chromium Cr is conducive to the solution strengthening of steel and the formation of suitable carbide, improves the elevated temperature strength of steel, hardness and resistance to
Grind performance.Cr can increase the quenching degree of steel, especially reasonably combined with Mn, Si, can significantly improve quenching degree, but can also increase simultaneously
Steel belt roof bolt fragility is inclined to.Therefore, the present invention controls chromium content to be 0.25-0.50%；
(8) boron can increase the quenching degree of steel, but too high levels will cause hot-short phenomenon, influence the hot-working character of steel, this
Invention Boron contents are controlled 0.0005~0.0030%；
(9) aluminium Al is added in steel as deoxidier, or is mingled with oxygen formation oxide, or is dissolved in iron, or forms nitrogen with N
Change aluminium.Infusible compounds of the Al with the formation small and dispersed distribution of other elements in steel can hinder crystal grain to grow up, and play refinement brilliant
Grain effect.But it is such as excessive with aluminum amount during deoxidation, the graphitization tendency of steel will be promoted, while when higher containing aluminium, the high temperature of steel
Intensity and toughness are relatively low.The present invention controls aluminium content to be 0.010-0.040%；
(10) nitrogen N is important element in steel, inevitably all containing a certain amount of in raw material during due to steel-making
Excessive N has some residual after all being combined with the Ti in steel in nitrogen, steel, and unnecessary " free " nitrogen in this part is to steel
Performance especially weldability be unfavorable, therefore, the content of nitrogen is controlled within 0.004%.
(11) oxygen O is harmful element in steel, easily causes hot-short, thus the content of oxygen of the present invention control 0.003% with
It is interior；
(12) hydrogen H is harmful element in steel, easily causes hydrogen embrittlement, thus the control of the content of hydrogen of the present invention 0.0002% with
It is interior；
In order to better meet Cutting free processability of the user to wear-resisting steel plate especially HBW430-520 ranks wear-resisting steel plate
It can require, the invention discloses a kind of Cutting free wear-resisting steel plate and preparation method thereof, the product and production technology have filled up the country
Outer blank, meets the big industry issue of traditional wear-resisting steel plate processing cutting difficulty.
The present invention is by the scientific and reasonable design to alloying component, and product adds temper after rolling through quenching, obtained resistance to
Steel plate thickness is ground between 8-70mm, Brinell hardness is between HBW430-520, and tensile strength is more than 1350MPa, and technique is simple,
Cost is low, and product hardness is high, intensity is high and is easy to cutting, especially solves the high-leveled and difficult industry problem in processing of hardness high intensity.
It can be widely applied to requiring on the products such as high hardness, intensity height, the engineering machinery knife edge board for being easy to machining.
The advantage of the invention is that：
Using appropriate carbon content, appropriate inexpensive alloy elements Si and Mn add less Cr, Mo, Nb and B element, no
Add the element such as Ni, Cu, V, strict control Ti/N values and its S content in steel, product of the present invention roll after through quenching+tempering at
Reason makes thickness wear-resisting steel plate hardness between 8-70mm reach that HBW430-520, tensile strength reach more than 1350MPa, especially full
The foot wear-resisting steel plate Cutting free processing request.
Embodiment
Cutting free wear-resisting steel plate of the present invention and preparation method thereof is described in detail with reference to embodiment.
To realize that the present invention provides thickness between 8-70mm, hardness is HBW430-520, tensile strength reaches 1350MPa
The purpose of the wear-resisting steel plate of above rank, in particular up to Cutting free processing.Present invention chemical composition as shown in table 1 carries out converter
Smelt, it is especially desirable to addition sulphur iron or feeding sulphur line adjustment sulfur content can be taken when LF refining furnace is refined.After refining is finished, enter
(RH stoves) application of vacuum of row vacuum degassing furnace simultaneously pours into continuous casting billet, is rolled after continuous casting billet is heated in Heavy Plate Rolling Line milling train
System, is quenched and temper after rolling to steel plate.
1-4 chemical compositions of the embodiment of the present invention are shown in Table 1.Slab heating temperature, finishing temperature, quenching temperature, tempering
The main technologic parameters such as temperature are shown in Table 2.Corresponding surface of steel plate Brinell hardness, thickness specification are also listed in table 2.
The chemical composition (wt.%) of the 1-4 Cutting free wear-resisting steel plates of the embodiment of the present invention of table 1
The 1-4 Cutting frees wear-resisting steel plate main production parameter of the embodiment of the present invention of table 2 and hardness number
Can be seen that by embodiment 1-4 designed according to present component, rolling mill practice and Technology for Heating Processing requirement given birth to
The wear-resisting steel plate of production, simple with technique, cost is low, and product hardness is high and is easy to cutting, especially solves hardness high intensity high
It is difficult to the industry problem of processing.Realize Brinell hardness HBW430-520, tensile strength and reach more than 1350MPa rank abrasion-resistant stees
The manufacture of plate, has better met the demand that user processes to such product Cutting free, and the production technology using the present invention is made
The product specification made is particularly suitable for requiring that hardness is high, intensity is high, be easy to all kinds of engineering mechanical device knife edge boards of machining,
Such as：Loading machine knife edge board, bulldozer perching knife sword plate etc..
The interval bound value of the technological parameter (such as temperature, time) of the present invention and interval value can realize this law,
Embodiment numerous to list herein.
It should be noted last that, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that to the technical side of the present invention
Case is modified or equivalent substitution, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention
Right among.
Claims (3)
1. a kind of Cutting free wear-resisting steel plate, it is characterised in that by percentage to the quality, the chemical composition of the steel plate is included：C：
0.25-0.32%, Si：0.15-0.45%, Mn：1.00-1.30%, P≤0.025%, S：0.010-0.020%, Ti：
0.012-0.040%, Cr：0.25-0.50%, B：0.0005-0.0030%, Al：0.010-0.040%, N≤0.004%, O
≤ 0.003%, H≤0.0002%, remaining is Fe and is inevitably mingled with that wherein Ti and N content meet Ti/N=3~8；P
P+S≤0.040% is met with S contents；
S contents should meet 0.015C+0.0011Mn+0.022Cr+1.3B≤S≤0.04C+0.0021Mn+0.013Cr+0.09B.
2. Cutting free wear-resisting steel plate according to claim 1, it is characterised in that described wear-resisting steel plate thickness is in 8-70mm
Between, Brinell hardness is between HBW430-520, and tensile strength is more than 1350MPa.
3. a kind of preparation method of Cutting free wear-resisting steel plate as claimed in claim 1, the described method comprises the following steps：
1) smelt：Molten steel containing each element is first passed through into desulfurizing iron, converter smelting is sent, LF refining furnace refining is re-fed into, plus
Enter sulphur iron or feeding sulphur line adjustment sulfur content, after refining is finished, carry out vacuum degassing furnace application of vacuum；
2) cast：By step 1) molten steel after processing send conticaster, and continuous casting is using whole argon gas protective casting, using slighter compress skill
Art ensures Inner Quality of Billet, and casting degree of superheat control is within 30 DEG C；
3) heat：Slab heating temperature is 1160~1220 DEG C, heats the reference time by 8-10min/cm to ensure that it is even that steel billet burns
Grill thoroughly, soaking time is no less than 60min, is rolled after heating；
4) roll：Two-phase control rolling is completed using wide and heavy plate mill, rough rolling step carries out >=1000 DEG C of perfect recrystallization rolling,
Finish rolling stage start rolling temperature is controlled at 880-980 DEG C, and cooling is controlled after rolling, and final cooling temperature is controlled between 150-660 DEG C,
After steel plate cooling, steel plate is aligned depending on plate shape situation, eventually strong temperature >=450 DEG C；
5) it is heat-treated：Quenching temperature is 880-940 DEG C, and the stove inside holding time is 10-25min, and water quenching after steel plate heating is returned
Fiery temperature is 150-350 DEG C, soaking time 15-25min, air cooling after insulation.
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| CN106555109A (en) * | 2016-10-31 | 2017-04-05 | 舞阳钢铁有限责任公司 | Have low temperature impact properties NM550 steel plates and its production method concurrently |
| CN107217202B (en) * | 2017-07-19 | 2019-06-25 | 武汉钢铁有限公司 | A kind of 500 grades of Brinell hardness of abrasion-resistant stee and its manufacturing method |
| CN107723601A (en) * | 2017-11-01 | 2018-02-23 | 山东钢铁股份有限公司 | A kind of residual stress is 50 100MPa wear-resisting steel plate and preparation method thereof |
| CN108660374A (en) * | 2018-05-23 | 2018-10-16 | 山东钢铁股份有限公司 | A kind of quenching aligning short route wear-resisting steel plate and preparation method thereof |
| CN109778073B (en) * | 2019-02-20 | 2021-05-11 | 宝钢特钢长材有限公司 | Free-cutting steel for automobile synchronizer and preparation method thereof |
| CN111004973A (en) * | 2019-12-21 | 2020-04-14 | 邯郸钢铁集团有限责任公司 | Low-alloy medium-carbon wear-resistant steel for low-cost ball mill lining plate and production method thereof |
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| CN104294161B (en) * | 2014-10-31 | 2016-08-24 | 武汉钢铁(集团)公司 | A kind of for high temperature resistant Cutting free high-strength steel |
| CN104480406A (en) * | 2014-11-28 | 2015-04-01 | 宝山钢铁股份有限公司 | Low-alloy high-strength high-toughness steel plate and manufacturing method thereof |
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