CN103031494A - Wear-resistant steel and production method thereof - Google Patents
Wear-resistant steel and production method thereof Download PDFInfo
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- CN103031494A CN103031494A CN2011103031737A CN201110303173A CN103031494A CN 103031494 A CN103031494 A CN 103031494A CN 2011103031737 A CN2011103031737 A CN 2011103031737A CN 201110303173 A CN201110303173 A CN 201110303173A CN 103031494 A CN103031494 A CN 103031494A
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Abstract
The invention discloses a wear-resistant steel, which comprises the following chemical components in percentage by weight: 0.16-0.2 percent of C, 0.50-0.70 percent of Si, 1.50-1.70 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.60-0.80 percent of Cr, 0.06-0.10 percent of V, 0.01-0.03 percent of N, 0.005-0.04 percent of Als, the balance of Fe and inevitable impurities. A production method comprises the following steps of smelting and casting a steel ingot with the required size and rolling the steel ingot, wherein before the steel ingot is rolled, the heating temperature is between 1050 and 1100 DEG C; heat is preserved for 100-110 minutes; the rolling temperature of a slab is between 1000 and 1050 DEG C; the steel ingot is repeatedly rolled to form the steel with a target thickness, wherein the cooling temperature is between 870 and 900 DEG C; a cooling speed is between 30 and 50 DEG C per second; the reddening temperature is between 180 and 250 DEG C; and the brinell hardness of the wear-resistant steel is between 370 and 430 HB.
Description
Technical field
The invention belongs to the metallic substance technical field, specially refer to a kind of wear-resisting with steel and production technology method thereof.
Background technology
Along with running speed and the intensity of mechanical means are more and more higher, many workpiece and equipment lost efficacy rapidly owing to wearing and tearing, and the waste of material that causes and financial loss are quite surprising, and the development of high-abrasive material has become the important factor that affects modern production efficient.Wear resisting steel is widely used in each departments such as metallurgy, mine, building materials, electric power, railway and military affairs, such as excavator bucket teeth, ball grinding machine lining board, crusher jaw, crushing wall, rolled mortar wall, tractor shoe, fan mill strike plate and railway switch etc.The wear resisting steel over-all properties of producing at present is lower, such as high manganese wear-resistant steel early, need to be in strong shock load or the processed sclerosis in surface of extrusion load lower stress, and the hardness raising just has preferably wear resistance, and its use range is narrower; Some low-alloy wear-resistant steels are unfavorable for that because carbon equivalent is higher welding uses, and mostly need to carry out off-line thermal treatment, have the problems such as production energy consumption is large, production efficiency is low, such as following patent:
" a kind of production technology method of low content alloy ultrahigh hardness wear-resistant steel plate " by name of University of Science ﹠ Technology, Beijing's application, number of patent application is 200910090637.3, a kind of wear resisting steel of high rigidity is provided, it contains C0.20～0.25%, Cr0.70～1.40%, quenching temperature are 950～900 ℃, then carry out 100～400 ℃ of tempering, tempering time 20～180min makes its production cost higher.
One " a kind of ultrahigh-strength wear-resistant steel and production method thereof " by name of wuhan iron ﹠ steel croup co. company application, publication number is the patent of CN 101250673A, it is wear resisting steel about 1300Mpa that a kind of tensile strength is provided, has preferably wear resistance, but it need to carry out the hardening and tempering process of 950 ℃ of+500 ℃ of tempering of quenching, and production energy consumption is large, production efficiency is low.
" An abrasion resistant steel " European patent of NKK company invention, the patent No. is EP 0527276, this steel has been applied for " Abrasion-resistant steel " United States Patent (USP) simultaneously, the patent No. is US 5403410, this steel has hardness value HB and is 503 to the maximum, tensile strength is about 1230MPa, therefore has excellent wear resisting property.But the carbon content of HB in this patent working example＞300 rank wear resisting steels is 0.19～0.34%, and typical composition is 0.30%, will cause the impelling strength of steel and weldability to reduce.
The United States Patent (USP) of " the Galling and wear resistant steel alloy " by name of the application of Armco company, the patent No. is US 4494988, this steel HRC reaches about 45, has preferably wear resistance.But this steel contains higher alloy content Cr4～6%, and Ni4～6% will improve steel-making cost; And this steel contains 0.07% P, will cause the toughness of steel to descend, and is unfavorable for processing and welding.
By above contrast patent as can be known, there is following deficiency in the wear resisting steel that can be used at present the members such as mechanical means: 1, contain the alloying elements such as higher Cr, Ni, Mo, production cost is higher; 2, the welding property of steel is relatively poor; 3, energy consumption in production process is large, rhythm of production is lower.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the purpose of this invention is to provide a kind of alloy content lower, and have wear-resisting steel plate and production method thereof than lower production cost, its Brinell hardness is between 370～430HB.
The present invention is not to need thermal treatment and lower alloy content as essential characteristic, in the present invention, its chemical composition by weight percentage composition is C0.16%～0.20%, Si0.50%～0.70%, Mn1.50%～1.70%, P≤0.020%, S≤0.010%, Cr0.60%～0.80%, V0.06%～0.10%, N0.01%～0.03%, Als0.005%～0.04%, all the other are Fe and inevitable impurity.
So the present invention selects above alloying element kind and content thereof to be:
C: be the key element that affects the low-alloy wear-resistant steel structure property, its rangeability is very large, the carbon content difference can obtain the Different matching relation of hardness and toughness, also be to improve steel hardness the most direct the most cheap element, but high carbon alloy hardness is high and toughness is not enough, also be unfavorable for the welding of structural part, the higher and lower hardness of low-carbon alloy toughness, the present invention determines optimal carbon content 0.16%～0.20%;
Si: silicon is the bioelement of deoxidation in steel making, has the effect of certain solution strengthening.And can improve martensitic temper resistance, and obtaining better performance, the content range of silicon of the present invention is 0.50%～0.70%;
Mn: manganese is the principal element that improves intensity and toughness, can significantly improve the element of steel hardenability, and cost is very cheap, is main adding elements, but the too high meeting of Mn reduces the ductility of steel, and content of the present invention is limited to 1.50%～1.70%;
Al: aluminium is deoxidant element, also can be used as the AlN forming element, and crystal grain thinning effectively is for the scope that reaches good deoxidation effect Al content of the present invention is Al0.005%～0.04%;
Cr can enlarge ferrite area, improves quench hardening, corrosion proof advantage, but too high Cr causes damage to toughness, is 0.60%～0.80% therefore add Cr content among the present invention;
V and C, N have extremely strong avidity, form stable V (C, N) compound, improve the hardness of steel.The compound of disperse can crystal grain thinning, improves the Coarsening Temperature of crystal grain; With the displacement solute atoms when existing, V atomic ratio iron atom size is large in steel for V, and easily segregation on dislocation line produces strong effect of dragging to climb of dislocation, Recrystallization nucleation is suppressed, thereby recrystallize is had strong interception; V can form phase in the middle of the gaps such as VC or VN in steel, in recrystallization process, because of VC, VN is to anchoring of dislocation and to effects such as the migration of subgrain boundary stop, thereby greatly increased the time of recrystallize, when being higher than critical temperature, V element shows as the solute drag mechanism to the effect of recrystallize, and when being lower than critical temperature, then show as and separate out pinning mechanism, the characteristics of V in steel improve austenitic recrystallization temperature exactly, thereby reach the purpose of refine austenite crystal grain, V (C, N) promote the ferritic formation of intracrystalline separating out of HAZ, make ferrite and pearlite be evenly distributed on intracrystalline and crystal boundary, thereby improve the toughness of heat affected zone, be conducive to the raising of welding property, content of vanadium is 0.06%～0.10% among the present invention; Nitrogen forms special nitride as easy as rolling off a log the combination with V, Al of interstitial atom, adds N in the V steel, can improve the Precipitation Temperature of carbonitride in austenite of V, and N content is 0.01%～0.03% among the present invention;
Impurity element P≤0.020% in the steel, S≤0.010% is to reduce the deleterious effect of impurity element.
More than be content range and the effect of adding various elements, production Brinell hardness of the present invention is the wear-resisting as follows with the used production technique feature of steel of 370～430HB:
Through smelting, be cast into the steel ingot of required size, be rolled at plate mill, roll front heating and temperature control 1050～1100 ℃ to guarantee tiny austenite crystal, be incubated 100～110 minutes, play the effect of rolling rear crystal grain thinning when making the austenite homogenizing; The slab start rolling temperature is controlled between 1000～1050 ℃, arrives target thickness through repeat-rolling; Open cold temperature between 870～900 ℃, speed of cooling is between 30～50 ℃/s, and red temperature is between 180～250 ℃.
Wear resisting steel by such scheme production has following beneficial effect: do not need to carry out quenching-and-tempering process, production efficiency is high, cost is low; Less alloy content does not contain noble metal Ni, Mo; Have lower carbon equivalent and higher intensity, hardness, Brinell hardness is between 370～430HB.
Embodiment
The present invention is further described below in conjunction with embodiment:
The present invention takes the 200Kg vacuum induction furnace to smelt, and is cast into the steel ingot of 65Kg, is rolled at the 500mm Experimental Rolling Mill for Plate, roll front heating and temperature control at 1100 ℃, to guarantee tiny austenite crystal, be incubated 100 minutes, then coming out of the stove is rolled.
Chemical composition of the present invention and production technique: its steel ingot is smelted into composition as shown in table 1, takes processing parameter as shown in table 2, and object performance will reach result as shown in table 3.
Table 1 various embodiments of the present invention smelting component, Wt%
| Embodiment | C | Si | Mn | P | S | Cr | V | N | Als |
| 1 | 0.16 | 0.70 | 1.70 | 0.015 | 0.006 | 0.70 | 0.070 | 0.015 | 0.005 |
| 2 | 0.17 | 0.65 | 1.65 | 0.015 | 0.006 | 0.80 | 0.060 | 0.025 | 0.020 |
| 3 | 0.18 | 0.60 | 1.60 | 0.015 | 0.006 | 0.65 | 0.065 | 0.010 | 0.010 |
| 4 | 0.19 | 0.55 | 1.55 | 0.015 | 0.006 | 0.60 | 0.10 | 0.030 | 0.030 |
| 5 | 0.20 | 0.50 | 1.50 | 0.015 | 0.006 | 0.70 | 0.08 | 0.020 | 0.040 |
Table 2 various embodiments of the present invention processing parameter
Table 3 various embodiments of the present invention performance
Claims (2)
1. wear resisting steel, it is characterized in that its chemical composition by weight percentage composition be C0.16%～0.20%, Si0.50%～0.70%, Mn1.50%～1.70%, P≤0.020%, S≤0.010%, Cr0.60%～0.80%, V0.06%～0.10%, N0.01%～0.03%, Als0.005%～0.04%, all the other are Fe and inevitable impurity.
2. the production method of a wear resisting steel according to claim 1 comprises smelting, is cast into the steel ingot of required size and rolling, it is characterized in that: roll front Heating temperature at 1050～1100 ℃, be incubated 100～110 minutes; The slab start rolling temperature arrives target thickness at 1000～1050 ℃ through repeat-rolling; Open cold temperature between 870～900 ℃, speed of cooling is between 30～50 ℃/s, and red temperature is between 180～250 ℃.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103436790A (en) * | 2013-08-29 | 2013-12-11 | 宝山钢铁股份有限公司 | Wear-resistant steel for ore slurry delivering welded pipe line and manufacturing method thereof |
| CN104561792A (en) * | 2013-10-10 | 2015-04-29 | 鞍钢股份有限公司 | A V-N alloyed high-strength steel plate and a manufacturing method thereof |
| CN113604737A (en) * | 2021-07-30 | 2021-11-05 | 山东钢铁股份有限公司 | Q550D high-strength steel plate and preparation method thereof |
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| JPH02228447A (en) * | 1989-02-28 | 1990-09-11 | Nippon Steel Corp | High toughness non-heat treated bar steel for hot forging |
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| JP2001234280A (en) * | 2000-02-28 | 2001-08-28 | Nkk Corp | Hot dip galvanized steel sheet for hot rolling base and producing method therefor |
| JP2005256134A (en) * | 2004-03-15 | 2005-09-22 | Sumitomo Metal Ind Ltd | Steel for induction hardening and crankshaft obtained by using the same |
| CN101338398A (en) * | 2008-08-14 | 2009-01-07 | 武汉钢铁(集团)公司 | High strength non-quenched and tempered free machining steel for automobile connecting bar and technological process thereof |
| CN102041458A (en) * | 2009-10-23 | 2011-05-04 | 宝山钢铁股份有限公司 | Low-alloy abrasion-resistant steel and manufacturing method thereof |
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2011
- 2011-09-29 CN CN2011103031737A patent/CN103031494A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02228447A (en) * | 1989-02-28 | 1990-09-11 | Nippon Steel Corp | High toughness non-heat treated bar steel for hot forging |
| JPH11152542A (en) * | 1997-09-18 | 1999-06-08 | Kobe Steel Ltd | Non-heattreated steel for hot forging, having high fatigue limit ratio, and its production |
| JP2001234280A (en) * | 2000-02-28 | 2001-08-28 | Nkk Corp | Hot dip galvanized steel sheet for hot rolling base and producing method therefor |
| JP2005256134A (en) * | 2004-03-15 | 2005-09-22 | Sumitomo Metal Ind Ltd | Steel for induction hardening and crankshaft obtained by using the same |
| CN101338398A (en) * | 2008-08-14 | 2009-01-07 | 武汉钢铁(集团)公司 | High strength non-quenched and tempered free machining steel for automobile connecting bar and technological process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103436790A (en) * | 2013-08-29 | 2013-12-11 | 宝山钢铁股份有限公司 | Wear-resistant steel for ore slurry delivering welded pipe line and manufacturing method thereof |
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| CN104561792A (en) * | 2013-10-10 | 2015-04-29 | 鞍钢股份有限公司 | A V-N alloyed high-strength steel plate and a manufacturing method thereof |
| CN104561792B (en) * | 2013-10-10 | 2017-01-04 | 鞍钢股份有限公司 | A kind of V-N alloying high strength steel plate and manufacture method |
| CN113604737A (en) * | 2021-07-30 | 2021-11-05 | 山东钢铁股份有限公司 | Q550D high-strength steel plate and preparation method thereof |
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Application publication date: 20130410 |