CN102260829A - 500 HB wear resistant steel plate and its manufacturing method - Google Patents
500 HB wear resistant steel plate and its manufacturing method Download PDFInfo
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Abstract
The invention discloses a 500 HB wear resistant steel plate, whose chemical elements contain, by weight, 0.23-0.33% of C, 0.10-0.50% of Si, 0.50-1.50% of Mn, Cr being less than or equal to 1.50%, Mo being less than or equal to 0.80%, 0.01-0.10% of Al, 0.01-0.10% of Ti, 0.0005-0.0040% of B, 0.01-0.08% of RE, 0.002-0.010% of Ca, Ni being less than or equal to 2.50%, P being less than or equal to 0.050%, S being less than or equal to 0.030%, and the balance being Fe and other unavoidable impurities. In addition, the mass percentages of the above chemical elements satisfy the following conditions: (Si+Mn) is less than or equal to1.50% and greater than or equal to 0.50%; (Al+Ti) is less than or equal to 0.15% and greater than or equal to 0.03%. Correspondingly, the invention also provides a manufacturing method of the 500 HB wear resistant steel plate. The steel plate prepared by the method has good mechanical processing property and its rigidity can reach over 500 HB.
Description
Technical field
The present invention relates to the wear-resisting steel plate and the manufacture method thereof of field of metallurgy, relate in particular to a kind of wear-resisting steel plate and manufacture method thereof of 500HB level.
Background technology
In various engineerings field, under the special condition of severe of the employed material working conditions of engineering, often need the high wear-resisting steel plate of working strength height, hardness to reduce the abrasion loss of equipment, prolong the work-ing life of equipment.
The wear resistance of steel plate depends primarily on its hardness, in addition, the toughness of steel also has certain influence to the wear resistance of steel, in general, the intensity of steel, hardness are high more, and the content of its carbon and alloy is just high more, and its welding property is just poor more thereupon, use propertieies such as cutting, bending are also relatively poor simultaneously, and this has just limited the widespread use of high hardness wear-resisting steel on engineering.
Shown in the table 1 is to have steel grade chemical ingredients and the content disclosed in the patent document that relates to wear resisting steel now.As can be seen from Table 1, publication number is respectively the steel grade described in the Chinese patent file of CN1132264 (open day be on October 2nd, 1996), CN1189542 (open day is on August 5th, 1998), CN1385549 (open day is on December 18th, 2002) and CN1132263 (open day is on October 2nd, 1996) and is high-carbon-Gao silicon-Gao Meng-Gao chromium component system, the alloy content height impairs performances such as weldability and toughness; Publication number is that the steel grade described in the Chinese patent literature of CN1865481 (open day be on November 22nd, 2006) is high silicon-Gao manganese composition system, though its carbon content is lower, impairs toughness; Publication number is that disclosed steel grade alloying element kind is many in the french patent document of FR2847272 (open day be on May 21st, 2004), content is high, and cost is higher, and is unfavorable for welding and mechanical workout.
Therefore, the kind of appropriate design carbon and alloying element and content, research and development high-performance and the good low-alloy wear-resistant steel of suitability have important practical significance.
Summary of the invention
The purpose of this invention is to provide a kind of 500HB grade wear-resisting steel plate and manufacture method thereof, design by reasonable component, on the basis that as far as possible reduces carbon and alloying element content, realize high strength, high rigidity and flexible matched well, simultaneously by rational technological design, make the wear-resisting steel plate that produces that use propertieies such as preferable welding property, cutting property and bending property be arranged, and then be of value to the widespread use of wear resisting steel on engineering.
According to above-mentioned purpose of the present invention, the invention provides a kind of 500HB grade wear-resisting steel plate, its chemical element quality per distribution ratio is: C:0.23～0.33%; Si:0.10～0.50%; Mn:0.50～1.50%; Cr≤1.50%; Mo≤0.80%; Al:0.01～0.10%; Ti:0.01～0.10%; B:0.0005～0.0040%; RE:0.01～0.08%; Ca:0.002～0.010%; Ni≤2.50%; P≤0.050%; S≤0.030%; Surplus is Fe and other unavoidable impurities; And the quality percentage composition of above-mentioned each chemical element satisfies:
1.50％≥(Si+Mn)≥0.50％；
0.15％≥(Al+Ti)≥0.03％。
The composition principle of design of 500HB grade wear-resisting steel plate of the present invention is specific as follows:
The C element is the most basic in the wear resisting steel, most important element, and it can significantly improve the intensity and the hardness of steel, and then improves the wear resistance of steel.But the C element is unfavorable to the toughness and the welding property of steel.Therefore, the C constituent content in the steel be should rationally control, thereby the toughness and the welding property of steel plate when obtaining high strength, high rigidity, guaranteed.
The Si element solid solution can improve their hardness and intensity in ferrite and austenite, yet the too high meeting of Si constituent content causes the toughness of steel sharply to descend.Consider that simultaneously the Si element is stronger than iron with the avidity of O element, be easy to generate low-melting silicate during welding, increased the flowability of slag and deposite metal, influence weldquality, so content is difficult for too much.
The Mn element can increase the hardening capacity of steel strongly, reduces the critical cooling velocity of martensite transformation temperature and steel.But when Mn content is higher, the tendency of the grain coarsening of making is arranged, and increase the crisp susceptibility of tempering of steel, and cause occurring in the strand segregation and crackle easily, reduce the performance of steel plate.Simultaneously Si element, Mn element can part replace mutually, but Si, when Mn content is simultaneously higher, very unfavorable to welding property, be limited, therefore, preferably its content is limited in 0.50wt%≤(Si+Mn)≤1.50wt% scope.
The Cr element can reduce critical cooling velocity, improves the hardening capacity of steel.The Cr element in steel, can form (Fe, Cr)
3C, (Fe, Cr)
7C
3(Fe, Cr)
23C
7Etc. multiple carbide, improve the intensity and the hardness of steel.The Cr element can stop or slow down separating out of carbide and assemble when tempering, can improve the temper resistance of steel.
The Mo element can crystal grain thinning, improves intensity and toughness.The Mo element in steel, be present in sosoloid mutually with carbide mutually in, therefore, contain the effect that molybdenum steel has solution strengthening and carbide dispersion-strengthened simultaneously.In addition, the Mo element is the element that reduces temper brittleness, can improve tempering and stablize.
The Ni element can dissolve each other with any ratio with iron, improves the low-temperature flexibility of steel by the refinement ferrite crystal grain, and has the effect of obvious reduction Cold Brittleness Transition Temperature.For high-level and high low temperature flexible wear resisting steel, N is very useful interpolation element.But too high levels easily causes surface of steel plate oxide skin to be difficult to come off, and cost significantly increases.
The Ti element is one of strong carbide forming element, forms trickle TiC particle with the C element.The TiC particle is tiny, is distributed in crystal boundary, reaches the effect of crystal grain thinning, and harder TiC particle can improve the wear resistance of steel.In addition, the Ti element can also form titanium nitride, plays the effect of fixed nitrogen.
The N element can form the AlN particle of tiny indissoluble, refinement microstructure in Al element and the steel.The Al element is not only reductor, promotes the effect that the meta austenite forms in addition.In addition, the carbide that the Al element can suppress and delay supercooled austenite decomposes, and improves toughness.The Ti element can form tiny titanizing composition granule crystal grain thinning, and the Al element can guarantee the formation of tiny titanizing composition granule, give full play to the crystal grain thinning effect of Ti element, so the content of Al and Ti satisfies this constraint condition: 0.03wt%≤(Al+Ti)≤0.15wt%.
In steel, add rare earth and can reduce elements segregation such as sulphur, phosphorus, improve shape, the size of non-metallic inclusion and distribute, simultaneously can crystal grain thinning, raising hardness.In addition, rare earth can improve yield tensile ratio, helps improving the obdurability of Hi-Stren steel.The content of rare earth is difficult for too much, otherwise can produce macrosegregation, reduces slab quality and mechanical property.
The B element can increase the hardening capacity of steel.The B element is quenched to not influence of anti-temper softening effect behind the martensite to steel, and boron-containing steel need be taked lower tempering temperature and short tempering time.Yet the B constituent content in the steel surpasses 0.007%, will cause hot-short phenomenon, influences the hot workability of steel.
The Ca element has remarkable effect to inclusion in the cast steel rotten, add The addition of C a element in the cast steel and can change the strip sulfide inclusion in the cast steel into globular CaS or (Ca, Mn) S is mingled with, and formed oxide compound of Ca and sulfide inclusion density are little, is easy to come-up and gets rid of.In addition, the Ca element also significantly reduces sulphur poly-partially at crystal boundary, and these all are of value to the quality that improves cast steel, and then the performance of raising steel.
Preferably, described 500HB grade wear-resisting steel plate, its chemical element quality per distribution ratio is: C:0.25～0.31%; Si:0.13～0.42%; Mn:0.75～1.33%; Cr≤1.12%; Mo≤0.51%; Al:0.025～0.063%; Ti:0.013～0.041%; B:0.0008～0.0025%; RE:0.02～0.07%; Ca:0.002～0.008%; Ni≤0.87%; P≤0.032%; S≤0.015%; Surplus is Fe and other unavoidable impurities; And the quality percentage composition of above-mentioned each chemical element satisfies:
1.50％≥(Si+Mn)≥0.50％；
0.15％≥(Al+Ti)≥0.03％。
Correspondingly, the present invention also provides a kind of manufacture method of 500HB grade wear-resisting steel plate, and it is according to the following steps manufacturing: smelting → external refining → casting → heating → rolling → cooling → quenching → tempering, and in the described heating steps, 1000～1300 ℃ of Heating temperatures; In the described rolling step, adopt free rolling, roll the back air cooling; In the described quenching step, quenching temperature is Ac
3～(Ac
3+ 100 ℃), the back water-cooled of coming out of the stove; In the described tempering step, 150～350 ℃ of tempering temperatures, the back air cooling of coming out of the stove.
Preferably, in the described heating steps, Heating temperature is 1050～1280 ℃.
Preferably, in the described rolling step, roll the back air cooling and adopt stacking or cold bed cooling.
Preferably, in the described quenching step, quenching temperature is Ac
3～(Ac
3+ 80 ℃), water-cooled is adopted in the back of coming out of the stove.
Preferably, in the described tempering step, 150～300 ℃ of tempering temperatures.
Preferably, to control the quality percentage composition of each chemical element be C:0.25～0.31% to described smelting step; Si:0.13～0.42%; Mn:0.75～1.33%; Cr≤1.12%; Mo≤0.51%; Al:0.025～0.063%; Ti:0.013～0.041%; B:0.0008～0.0025%; RE:0.02～0.07%; Ca:0.002～0.008%; Ni≤0.87%; P≤0.032%; S≤0.015%; Surplus is Fe and other unavoidable impurities.
The present invention makes a kind of 500HB grade wear-resisting steel plate by reasonable component design and specific technology, and it has following advantage compared to prior art:
1. by rational chemical design control carbon equivalent, make to the present invention relates to wear-resisting steel plate and have weldability, and its can cut, mechanical workout such as bending, have very strong engineering machinery suitability.
2. the present invention adopts the technology of low-temperaturetempering behind the steel plate quenching, has eliminated the internal stress of back steel plate of quenching, and has made steel plate that higher intensity, hardness and toughness be arranged.
3. 500HB grade wear-resisting steel plate Brinell hardness of the present invention is greater than 500HB, and-20 ℃ of summers, greater than 40J, therefore the wear-resisting steel plate that the present invention relates to had the good mechanical performance, has guaranteed that steel plate has good abrasion resistance under bad working environments than impact of collision merit.
Description of drawings
Fig. 1 is the micro-organization chart of the wear-resisting steel plate in the embodiment of the invention 4.
Fig. 2 is the thickness interface measured hardness graphic representation of the wear-resisting steel plate in the embodiment of the invention 5.
Embodiment
500HB grade wear-resisting steel plate chemical ingredients proportioning among the embodiment of the invention 1-6 sees Table 2:
The chemical ingredients of table 2. embodiment 1-6 and Comparative Examples light plate (wt%)
Surplus is Fe and unavoidable impurities in the last table.
With raw materials for metallurgy according to step: smelting → external refining → casting → heating → rolling → cooling → quenching → tempering is made, the steel plate chemical element quality per distribution ratio of controlling among each embodiment is as shown in table 1, and the concrete processing parameter among the embodiment 1-6 is referring to table 3.
Concrete processing parameter among the table 3. embodiment 1-6
Table 4 is the mechanical property of each wear-resisting steel plate and compared steel among the embodiment of the invention 1-6.As known from Table 4, embodiment of the invention 1-6 high-wearing feature wear resisting steel hardness is greater than 500HB ,-20 ℃ of summers than impact of collision merit greater than 40J, can be up to 70J, therefore wear-resisting steel plate of the present invention has good mechanical property.
The mechanical property of table 4. embodiment of the invention 1-6 and compared steel
| Steel grade | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
Embodiment 6 | Compared steel 1 | Compared steel 2 |
| Hardness (HBW) | 510 | 508 | 512 | 521 | 518 | 523 | 400 | 475 |
| -20 ℃ of summers are than impact of collision merit (J) | 73 | 68 | 61 | 55 | 53 | 48 | - | - |
Wear-resisting steel plate in the embodiment of the invention 3 is carried out oblique Y groove welding crack test, and test-results is referring to table 5.As shown in Table 5, the wear-resisting steel plate that embodiment 3 makes is under 150 ℃ of preheating condition, and crackle does not appear in postwelding, so steel plate of the present invention has good welding property.
The wear-resisting steel plate welding performance test result of table 5. embodiment of the invention 3
The wear-resisting steel plate of the embodiment of the invention 4 and HARDOX500 (compared steel 3) carry out cut resistance test on the ML-100 grain-abrasion testing machine, wearing test the results are shown in Table 6.As shown in Table 6, the wear resistance of wear-resisting steel plate and compared steel are suitable among the present invention.
The wear test result of the wear-resisting steel plate of table 6. embodiment of the invention 6 and HARDOX500 wear-resisting steel plate
In addition, as seen from Figure 1, the microstructure of the wear-resisting steel plate among the embodiment 4 is mainly martensite.
As seen from Figure 2, the wear-resisting steel plate cross section hardness among the embodiment 5 is more even.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (8)
1. a 500HB grade wear-resisting steel plate is characterized in that, its chemical element quality per distribution ratio is:
C：0.23～0.33％；
Si：0.10～0.50％；
Mn：0.50～1.50％；
Cr≤1.50％；
Mo≤0.80％；
Al：0.01～0.10％；
Ti：0.01～0.10％；
B：0.0005～0.0040％；
RE：0.01～0.08％；
Ca：0.002～0.010％；
Ni≤2.50％；
P≤0.050％；
S≤0.030％；
Surplus is Fe and other unavoidable impurities; And the quality percentage composition of above-mentioned each chemical element satisfies:
1.50％≥(Si+Mn)≥0.50％；
0.15％≥(Al+Ti)≥0.03％。
2. 500HB grade wear-resisting steel plate as claimed in claim 1 is characterized in that, its chemical element quality per distribution ratio is:
C：0.25～0.31％；
Si：0.13～0.42％；
Mn：0.75～1.33％；
Cr≤1.12％；
Mo≤0.51％；
Al：0.025～0.063％；
Ti：0.013～0.041％；
B：0.0008～0.0025％；
RE：0.02～0.07％；
Ca：0.002～0.008％；
Ni≤0.87％；
P≤0.032％；
S≤0.015％；
Surplus is Fe and other unavoidable impurities; And the quality percentage composition of above-mentioned each chemical element satisfies:
1.50％≥(Si+Mn)≥0.50％；
0.15％≥(Al+Ti)≥0.03％。
3. the manufacture method of 500HB grade wear-resisting steel plate as claimed in claim 1 is characterized in that, according to the following steps manufacturing: smelting → casting → heating → rolling → cooling → quenching → tempering, in the described heating steps, 1000～1300 ℃ of Heating temperatures; In the described rolling step, adopt free rolling, roll the back air cooling; In the described quenching step, quenching temperature is Ac
3～(Ac
3+ 100 ℃), the back water-cooled of coming out of the stove; In the described tempering step, 150～350 ℃ of tempering temperatures, the back air cooling of coming out of the stove.
4. the manufacture method of 500HB grade wear-resisting steel plate as claimed in claim 3 is characterized in that, in the described heating steps, Heating temperature is 1050～1280 ℃.
5. the manufacture method of 500HB grade wear-resisting steel plate as claimed in claim 4 is characterized in that, in the described rolling step, rolls the back air cooling and adopts stacking or cold bed cooling.
6. the manufacture method of 500HB grade wear-resisting steel plate as claimed in claim 5 is characterized in that, in the described quenching step, quenching temperature is Ac
3～(Ac
3+ 80 ℃), water-cooled is adopted in the back of coming out of the stove.
7. the manufacture method of 500HB grade wear-resisting steel plate as claimed in claim 6 is characterized in that, in the described tempering step, and 150～300 ℃ of tempering temperatures.
8. the manufacture method of 500HB grade wear-resisting steel plate as claimed in claim 7 is characterized in that, the quality percentage composition that described smelting step is controlled each chemical element is C:0.25～0.31%; Si:0.13～0.42%; Mn:0.75～1.33%; Cr≤1.12%; Mo≤0.51%; Al:0.025～0.063%; Ti:0.013～0.041%; B:0.0008～0.0025%; RE:0.02～0.07%; Ca:0.002～0.008%; Ni≤0.87%; P≤0.032%; S≤0.015%; Surplus is Fe and other unavoidable impurities.
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