CN102134682A - Wear resistant steel plate - Google Patents
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Abstract
The invention provides a wear resistance steel plate, which contains the chemical ingredients (by weight percent) of: 0.31 to 0.40% of C, 0.10 to 0.80% of Si, 0.20 to 1.50% of Mn, not more than 0.050% of P, not more than 0.030% of S, 0 to 1.50% of Cr, 0 to 0.80% of Mo, 0.02 to 0.20% of Al, 0.0005 to 0.0040% of B, 0 to 0.10% of Ti, 0 to 0.030% of Ca, the balance of Fe and unavoidable impurities, wherein Cr+Mo is not less than 0.10% and not more than 1.80%, and Al+Ti not less than 0.05% and not more than 0.18%. A manufacturing method of the wear resistance steel plate comprises the steps of smelting, refining, casting, rolling, quenching, tempering and the like. The 550 HB-level wear resistance steel plate, which is obtained from the ingredients and process, has high hardness (not less than 550 HB), can be welded and bent, and includes the microstructure of martensite or martensite and residual austenite. The steel plate has superior wear resistance and is extremely suitable for working under strong wear environment, especially on vehicles or facilities, like buckets, loaders, mining electric wheel dump tracks and the like, which come into contact with high-hardness materials, such as high strength ore and the like.
Description
Technical field
The present invention relates to wear resisting steel, particularly relate to a kind of 550HB grade wear-resisting steel plate and manufacture method thereof.
Background technology
It is abominable especially that wear-resisting steel plate is widely used in working conditions, requires high strength, on the engineering goods such as the engineering of high-wear resistance, mining, building, agricultural, manufacture of cement, harbour, electric power and metallurgy.As dozer, shovel loader, excavator, wagon tremie and various mining machinery, grab bucket, stacker-reclaimer, defeated material warp architecture etc.
At present, the hardness of low-alloy high-strength wear resisting steel is generally 300HB～500HB.Yet abominable especially for working conditions, when especially contacting with high rigidity rock, mineral aggregate etc., the low level wear-resisting steel plate can not satisfy service requirements, needs the wear-resisting steel plate strong, that hardness is higher, to reduce the abrasion loss of equipment, increases the service life.
The wear resistance of material depends primarily on its hardness, and toughness also has very important influence to the wear resistance of material.Only the hardness that improves material can not guarantee that material has preferable wear resistance and long work-ing life under complex working condition.By adjusting composition and thermal treatment process, control low-alloy wear-resistant steel hardness and flexible rational Match obtain good comprehensive mechanical performance, and then improve the wear resisting property under the impact condition, make it satisfy the needs of different wear working conditions.
Welding can solve the connection of various steel, has a very important role in engineering is used.Welding cold cracking is the weldprocedure defective of the most normal appearance, and especially when welding high-strength wearable steel, the tendency that cold crack occurs is very big.For high-intensity wear-resisting steel plate, Welding Problems is particularly evident.Bending also is a kind of very general performance requriements during engineering is used.High-strength abrasion-proof steel carbon and alloy content are higher, and this causes steel plate crackle to occur easily in BENDING PROCESS, and then reduce the suitability of wear resisting steel on engineering.
Heavy addition steel interalloy constituent content can obtain good mechanical property, but influences its welding and bending property.Therefore, the control alloying element content, research and development excellent performance, the good low-alloy wear-resistant steel of suitability are the trend of development.
Relevant for the introduction of wear resisting steel, disclose a kind of wear resisting steel as French Patent FR2847272 in the prior art, its chemical ingredients is C:0.24～0.35%, Si:0～2%, Mn:0～2.5%, S :≤0.15%, Cr:0～5%, Mo:0～1%, Ni:0～5%, Cu:0～1.5%, B:0～0.02%, Al:0～2%, Ti:0～1.1%, N＜0.03%, W:0～2%, Zr:0～2.2%, the carbon content of this wear resisting steel is relatively low, and composition is complicated.European patent EP 1563104 discloses a kind of wear-resisting steel plate, and its chemical ingredients is C:0.35～0.8%, Si:0～2.0%, Mn:0～2.5%, S :≤0.15%, Cr:0～5%, Mo:0～0.05%, Ni:0～5%, Cu:0～1.5%, B:0～0.02%, Al:0～2%, Ti:0～1.1%, N＜0.03%, W:0～1%, Zr:0～4%, this wear resisting steel are that the composition system and the composition of high-carbon content is complicated.Publication number is CN1132264, CN1775983, and CN1189542, CN1385549 and CN1132263 Chinese patent application are high silicon, high manganese composition system, and contain more alloying element, are unsuitable for welding, have limited wear resisting steel in industrial widespread use.
Summary of the invention
The purpose of this invention is to provide a kind of 550HB grade wear-resisting steel, on a small amount of alloying element of interpolation basis, realize high strength, high rigidity and preferable flexible coupling, and have weldability, be beneficial to widespread use on engineering, be particluarly suitable for using under the bad working environments.
For achieving the above object, the chemical ingredients of 550HB grade wear-resisting steel plate of the present invention and content are: C:0.31～0.40wt.%, Si:0.10～0.80wt.%, Mn:0.20～1.50wt.%, P :≤0.050wt.%, S :≤0.030wt.%, Cr:0～1.50wt.%, Mo:0～0.80wt.%, Al:0.02～0.20wt.%, B:0.0005～0.0040wt.%, Ti:0～0.10wt.%, Ca:0～0.030wt.%, wherein satisfy: 0.10wt.%≤Cr+Mo≤1.80wt.%, 0.05wt.%≤Al+Ti≤0.18wt.%, surplus is Fe and unavoidable impurities.
Preferably, 0.60wt.%≤Si+Mn≤1.60wt.%.
Steel grade involved in the present invention has been realized high strength, high rigidity and preferable flexible coupling by the science design of element kind and content on a small amount of alloying element of interpolation basis, improved the wear resistance of steel.
The chemical ingredients effect of 550HB grade wear-resisting steel plate involved in the present invention below is described in detail in detail.
Carbon: content is controlled in 0.31～0.40wt% scope.Carbon is the most basic in the wear resisting steel, most important element, can improve the intensity and the hardness of steel, and then improves the wear resistance of steel.For high-grade and high thickness wear resisting steel, need to add more carbon content.Carbon is unfavorable to the toughness and the welding property of steel.Therefore, should rationally control the carbon content in the steel, guarantee the toughness and the welding property of steel plate when obtaining high strength, high rigidity, controlling carbon content in the present invention is 0.31～0.40wt%.
Silicon: content is controlled in 0.10～0.80wt% scope.Silicon is solid-solubilized in hardness and the intensity that improves them in ferrite and the austenite, yet the too high meeting of silicone content causes the toughness of steel sharply to descend.Consider that simultaneously silicon is stronger than iron with the avidity of oxygen, be easy to generate low-melting silicate during welding, increase the flowability of slag and deposite metal, influence weldquality, so content is difficult for too much.Take all factors into consideration above factor, the control silicone content is 0.10～0.80wt% among the present invention.
Manganese: content is controlled in 0.20～1.50wt% scope.Manganese increases the hardening capacity of steel strongly, reduces the critical cooling velocity of 550HB level transition temperature and steel.But when manganese 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.The partial action of silicon, manganese is similar, can partly replace, but silicon, manganese content while are when higher, very unfavorable to welding property, therefore limited again, in addition, added the toughness that an amount of manganese can improve high silicon steel, therefore, preferably its content is limited in 0.60wt.%≤Si+Mn≤1.60wt.% scope.
Chromium: content is controlled in 0～1.50wt.% scope.Chromium can reduce critical cooling velocity, improve the hardening capacity of steel.Chromium in steel, can form (Fe, Cr)
3C, (Fe, Cr)
7C
3(Fe, Cr)
23C
7Etc. multiple carbide, improve intensity and hardness.Chromium can stop or slow down separating out of carbide and assemble when tempering, can improve the temper resistance of steel.
Molybdenum: content is controlled in 0～0.80wt.% scope.Molybdenum can crystal grain thinning, improves intensity and toughness.Molybdenum 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.Molybdenum is the element that reduces temper brittleness, can improve temper resistance.Chromium can improve hardening capacity, but unfavorable to toughness, needs to add an amount of molybdenum and regulates, but molybdenum can increase cost greatly, therefore content needs control, takes all factors into consideration above factor, and the content of chromium and manganese is controlled at following scope: 0.10wt.%≤Cr+Mo≤1.80wt.%.
Titanium: content is controlled in 0～0.10wt.% scope.Titanium is one of strong carbide forming element, forms trickle TiC particle with carbon.The TiC particle is tiny, is distributed in crystal boundary, reaches the effect of crystal grain thinning, and harder TiC particle improves the wear resistance of steel.Titanium can reduce steel 250 ℃～400 ℃ temper brittleness.If titanium and boron add jointly, will obviously reduce Low-Temperature Temper Brittleness.
Aluminium: content is controlled in 0.02～0.20wt.% scope.Aluminium and nitrogen in steel can form the AlN particle of tiny indissoluble, the crystal grain of refinement steel.But the crystal grain of aluminium refinement steel, fixedly nitrogen in the steel and oxygen alleviate the susceptibility of steel to breach, reduce or eliminate the aging phenomenon of steel, and improve the toughness of steel.Aluminium reduces austenitic stability, the condensate depression when reducing austenitic transformation, and the hardening capacity of reduction steel improves the critical hardening speed of cooling.Titanium all can form fine particle and then crystal grain thinning, and aluminium can guarantee the formation of fine titanium particles, gives full play to the crystal grain thinning effect of titanium, so the content range of aluminium and titanium is as follows: 0.05wt.%≤Al+Ti≤0.18wt.%.
Boron: content is controlled in 0.0005～0.0040wt.% scope.Boron increases the hardening capacity of steel.Boron is quenched to not influence of anti-temper softening effect after the 550HB level to steel, and boron-containing steel need be taked lower tempering temperature and short tempering time.Boron content in the steel surpasses 0.007%, will cause hot-short phenomenon, influences the hot workability of steel.
Calcium: content is controlled in 0～0.030wt.% scope.Calcium has remarkable effect to inclusion in the cast steel rotten, add in the cast steel an amount of calcium the strip sulfide inclusion in the cast steel can be changed into globular CaS or (Ca, Mn) S is mingled with, formed oxide compound of calcium and sulfide inclusion density are little, are easy to come-up and get rid of.Calcium 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.Additive effect is obvious more for a long time at inclusion for calcium, helps guaranteeing the mechanical property of steel, especially toughness.
Phosphorus and sulphur: in wear resisting steel, sulphur and phosphorus are harmful element, and their content is wanted strict control, and the control phosphorus content is less than 0.050wt.% in the steel grade involved in the present invention, and sulphur content is less than 0.030wt.%.
Another object of the present invention is to provide the manufacture method of this 550HB grade wear-resisting steel plate, and this method comprises converter or electrosmelting, external refining, casting, heating, rolling, cooling, quenching and tempering step successively.Wherein in the heating steps, be heated to temperature less than 1300 ℃; In the rolling step, start rolling temperature rolls the back air cooling less than 1250 ℃, and described air cooling adopts stacking or cold bed cooling; In the quenching step, quenching temperature is less than Ac
3+ 100 ℃; In the tempering step, tempering temperature is less than 400 ℃.
Preferably, in described heat-processed, Heating temperature is less than 1280 ℃, and more preferably heating temperature is less than 1250 ℃, in case austenite crystal is too grown up and the billet surface severe oxidation, most preferably Heating temperature is 1250～1180 ℃.
Preferably, start rolling temperature rolls the back air cooling less than 1230 ℃.More preferably start rolling temperature is less than 1200 ℃, and suitable low temperature open rolling helps thinning microstructure, improves the steel plate mechanical property, and most preferably start rolling temperature is 1150～1200 ℃.
Preferably, quenching temperature is less than Ac
3+ 80 ℃, the back water-cooled of coming out of the stove, more preferably quenching temperature is less than Ac
3+ 60 ℃, help thinning microstructure, improve mechanical property.Most preferably quenching temperature is 845～910 ℃.
Preferably, tempering temperature is less than 350 ℃, the back air cooling of coming out of the stove.More preferably tempering temperature helps improving the steel plate mechanical property less than 320 ℃.Most preferably tempering temperature is 150～300 ℃.
Preferably, air cooling adopts stacking or cold bed cooling, can slow down speed of cooling, prevents the steel plate cracking.
The present invention has controlled carbon and alloy content by rational designing chemical composition (content and the proportionings of principal elements such as C, Mn, Cr and Mo).The wear-resisting steel plate that such composition design obtains has weldability, is fit to the needs engineering machinery welded and uses the field.
The present invention has eliminated the internal stress of back steel plate of quenching, and has made steel plate that higher intensity, hardness and toughness be arranged by with low-temperaturetempering behind the steel plate quenching.
Because composition and technological design are reasonable, from implementation result, the process system of wear-resisting steel plate of the present invention is looser, can stably carry out industrial production.
Wear-resisting steel plate of the present invention has high intensity, hardness and good impelling strength etc., can cut, mechanical workout such as bending, has very strong suitability.
The 550HB grade wear-resisting steel plate Brinell hardness that the present invention produces is greater than 550HB, and the summer can reach 100J than impact of collision merit, has splendid mechanical property, and this has guaranteed that steel plate still has the excellent abrasive energy under bad working environments.
Description of drawings
Fig. 1 is microstructure (500 times) photo of 550HB grade wear-resisting steel plate of the present invention, and the microstructure of this steel plate is a martensite as seen from the figure;
Fig. 2 is the 550HB grade wear-resisting steel plate thick section hardness measured value of the embodiment of the invention 5.
Embodiment
The present invention is further elaborated with embodiment below.These embodiment only are the descriptions to embodiment of the present invention, scope of the present invention are not had any restriction.
Embodiment 1
The chemical ingredients of the 550HB grade wear-resisting steel plate of embodiment 1 is as shown in table 1.Press the chemical ingredients shown in the table 1 at electric furnace or converter smelting, be cast into continuously cast bloom or steel ingot after the refining, continuously cast bloom or steel ingot are heated to 1250 ℃, start rolling temperature is 1200 ℃, the Finished Steel plate thickness is 6mm, rolling back air cooling, and quenching temperature is 910 ℃, tempering temperature is 150 ℃, stacking or cold bed cooling after the tempering.
Embodiment 2
The chemical ingredients of the 550HB grade wear-resisting steel plate of embodiment 2 is as shown in table 1.Press the chemical ingredients shown in the table 1 at electric furnace or converter smelting, be cast into continuously cast bloom or steel ingot after the refining, continuously cast bloom or steel ingot are heated to 1230 ℃, start rolling temperature is 1180 ℃, the Finished Steel plate thickness is 12mm, quenching temperature is 890 ℃, and tempering temperature is 180 ℃, stacking or cold bed cooling after the tempering.
Embodiment 3
The chemical ingredients of the 550HB grade wear-resisting steel plate of embodiment 3 is as shown in table 1.Press the chemical ingredients shown in the table 1 at electric furnace or converter smelting, be cast into continuously cast bloom or steel ingot after the refining, continuously cast bloom or steel ingot are heated to 1200 ℃, start rolling temperature is 1150 ℃, the Finished Steel plate thickness is 20mm, quenching temperature is 860 ℃, and tempering temperature is 220 ℃, stacking or cold bed cooling after the tempering.
Embodiment 4
The chemical ingredients of the 550HB grade wear-resisting steel plate of embodiment 4 is as shown in table 1.Press the chemical ingredients shown in the table 1 at electric furnace or converter smelting, be cast into continuously cast bloom or steel ingot after the refining, continuously cast bloom or steel ingot are heated to 1180 ℃, start rolling temperature is 1130 ℃, the Finished Steel plate thickness is 30mm, quenching temperature is 850 ℃, and tempering temperature is 260 ℃, stacking or cold bed cooling after the tempering.
Embodiment 5
The chemical ingredients of the 550HB grade wear-resisting steel plate of embodiment 5 is as shown in table 1.Press the chemical ingredients shown in the table 1 at electric furnace or converter smelting, be cast into continuously cast bloom or steel ingot after the refining, continuously cast bloom or steel ingot are heated to 1190 ℃, start rolling temperature is 1160 ℃, the Finished Steel plate thickness is 50mm, quenching temperature is 845 ℃, and tempering temperature is 280 ℃, stacking or cold bed cooling after the tempering.
Embodiment 6
The chemical ingredients of the 550HB grade wear-resisting steel plate of embodiment 6 is as shown in table 1.Press the chemical ingredients shown in the table 1 at electric furnace or converter smelting, be cast into continuously cast bloom or steel ingot after the refining, continuously cast bloom or steel ingot are heated to 1220 ℃, start rolling temperature is 1180 ℃, the Finished Steel plate thickness is 60mm, and quenching temperature is 850 ℃, and tempering temperature is 300 ℃.Stacking or cold bed cooling after the tempering.
Shown in Figure 1 is the microstructure of 550HB grade wear-resisting steel plate of the present invention, and the microstructure of this steel plate is a martensite as seen from the figure.
Comparative Examples is related steel grade in the existing patent.
The chemical ingredients of table 1 embodiment of the invention 1-6 and Comparative Examples (wt%)
| C | Si | Mn | P | S | Cr | Mo | Al | Ti | B | Ca | Ni | |
| Embodiment 1 | 0.31 | 0.65 | 1.45 | 0.025 | 0.010 | - | 0.45 | 0.06 | 0.025 | 0.0011 | 0.005 | - |
| Embodiment 2 | 0.32 | 0.41 | 1.27 | 0.020 | 0.007 | 0.45 | 0.58 | 0.02 | 0.041 | 0.0019 | 0.010 | - |
| Embodiment 3 | 0.34 | 0.26 | 1.05 | 0.018 | 0.013 | 0.97 | - | 0.04 | 0.067 | 0.0017 | 0.011 | - |
| Embodiment 4 | 0.36 | 0.34 | 0.91 | 0.021 | 0.011 | 0.71 | 0.33 | 0.08 | - | 0.0021 | - | - |
| Embodiment 5 | 0.38 | 0.22 | 0.78 | 0.023 | 0.009 | 1.02 | 0.15 | 0.10 | 0.034 | 0.0022 | 0.012 | - |
| Embodiment 6 | 0.40 | 0.20 | 0.45 | 0.019 | 0.012 | 0.83 | 0.21 | 0.07 | 0.013 | 0.0026 | 0.003 | - |
| Comparative Examples 1 | 0.35 | 0.81 | 1.20 | - | - | 1.35 | 0.38 | - | 0.016 | 0.0020 | - | 0.27 |
| Comparative Examples 2 | 0.36 | 0.85 | 1.30 | - | - | 0.70 | 0.10 | - | 0.040 | 0.0020 | - | 0.50 |
| Comparative Examples 3 | 0.39 | 0.79 | 1.21 | - | - | 1.34 | 0.39 | - | 0.045 | 0.0030 | - | 0.25 |
Test 1: mechanical property test
550HB grade wear-resisting steel plate to embodiment of the invention 1-6 carries out Mechanics Performance Testing, and test result sees Table 2.
The 550HB grade wear-resisting steel plate of table 2 embodiment of the invention 1-6 and the mechanical property of compared steel
| Hardness HB10/3000 | Summer is than impact of collision merit, J (room temperature) | |
| Embodiment 1 | 555 | 107 |
| Embodiment 2 | 563 | 115 |
| Embodiment 3 | 576 | 112 |
| Embodiment 4 | 581 | 106 |
| Embodiment 5 | 578 | 115 |
| Embodiment 6 | 584 | 111 |
| Comparative Examples 1 | 510 | 35 |
| Comparative Examples 2 | 460 | 42 |
| Comparative Examples 3 | 495 | 38 |
As can be seen from Table 2, embodiment of the invention 1-6 high-wearing feature passive hardness is greater than 550HB, and the room temperature summer can reach 100J than impact of collision merit, and high-wearing feature steel plate involved in the present invention has good mechanical property.Steel plate hardness involved in the present invention apparently higher than with the hardness of compared steel 1,2 and 3 steel plates, and have preferable impelling strength.
Test 2: thickness of slab cross section hardness test
By standard GB/T 4340-1999 the cross section hardness of the 550HB grade wear-resisting steel plate of the embodiment of the invention 5 is measured, observed value is seen Fig. 2.
As can be seen from Figure 2, the cross section hardness of 550HB grade wear-resisting steel plate of the present invention is even.
The 550HB grade wear-resisting steel plate of other embodiment has also obtained the uniform result of cross section hardness.
Test 3: solderability test
550HB grade wear-resisting steel plate to embodiment of the invention 1-6 carries out welding performance test (little iron grinds test), and test-results is as shown in table 3.
The 550HB grade wear-resisting steel plate welding performance test result of table 3 embodiment of the invention
As shown in Table 3, crackle does not appear in embodiment of the invention steel plate postwelding under suitable preheating condition, and steel plate of the present invention has welding property preferably.
Test 4: cut resistance test
Cut resistance test is carried out on the ML-100 grain-abrasion testing machine.550HB grade wear-resisting steel plate to embodiment of the invention 1-6 carries out cut resistance test.500HB grade wear-resisting steel (508HB) wearing test that the present invention relates to steel grade and Comparative Examples 4 the results are shown in Table 4.
The wear test result of wear-resisting steel plate that table 4 the present invention relates to and 500HB grade wear-resisting steel plate
| Steel grade | Test temperature | The wearing test condition | Wear rate (mg/M) |
| The embodiment of the invention 1 | Room temperature | 80 orders sand paper/42N load | 6.488 |
| The embodiment of the invention 2 | Room temperature | 80 orders sand paper/42N load | 6.378 |
| The embodiment of the invention 3 | Room temperature | 80 orders sand paper/42N load | 6.305 |
| The embodiment of the invention 4 | Room temperature | 80 orders sand paper/42N load | 6.102 |
| The embodiment of the invention 5 | Room temperature | 80 orders sand paper/42N load | 6.235 |
| The embodiment of the invention 6 | Room temperature | 80 orders sand paper/42N load | 5.986 |
| Comparative Examples 4 | Room temperature | 80 orders sand paper/42N load | 7.123 |
Can find out that from table 4 wear resisting property of 550HB grade wear-resisting steel plate of the present invention is significantly higher than the 500HB grade wear-resisting steel plate.
More than comparatively describe the present invention in detail by specific embodiment; but be not limited only to these embodiment; not breaking away under the prerequisite that the present invention conceives substantially, other variations or improved other equivalent embodiment can also be arranged, these changes and improvements all should belong to the claimed scope of claim.
Claims (10)
1. wear-resisting steel plate, its chemical ingredients is by weight percentage: C:0.31～0.40%, Si:0.10～0.80%, Mn:0.20～1.50%, P :≤0.050%, S :≤0.030%, Cr:0～1.50%, Mo:0～0.80%, Al:0.02～0.20%, B:0.0005～0.0040%, Ti:0～0.10%, Ca:0～0.030%, 0.10%≤Cr+Mo≤1.80%, 0.05%≤Al+Ti≤0.18%, surplus are Fe and unavoidable impurities.
2. wear-resisting steel plate as claimed in claim 1 is characterized in that, its chemical ingredients satisfies: 0.60%≤Si+Mn≤1.60%.
3. the manufacture method of claim 1 or 2 described wear-resisting steel plates comprises successively: converter or electrosmelting, external refining, casting, heating, rolling, cooling, quenching and tempering step;
In heating steps, Heating temperature is less than 1300 ℃;
In rolling step, start rolling temperature rolls the back air cooling less than 1250 ℃;
In the quenching step, quenching temperature is less than Ac
3+ 100 ℃;
In tempering step, tempering temperature is less than 400 ℃.
4. the manufacture method of wear-resisting steel plate as claimed in claim 3 is characterized in that, Heating temperature is less than 1280 ℃.
5. the manufacture method of wear-resisting steel plate as claimed in claim 4 is characterized in that, Heating temperature is 1250～1180 ℃.
6. as the manufacture method of the arbitrary described wear-resisting steel plate of claim 3～5, it is characterized in that start rolling temperature is less than 1230 ℃.
7. the manufacture method of wear-resisting steel plate as claimed in claim 6 is characterized in that, start rolling temperature is 1150～1200 ℃.。
8. as the manufacture method of the arbitrary described wear-resisting steel plate of claim 3～7, it is characterized in that quenching temperature is less than Ac
3+ 80 ℃, preferred quenching temperature is 845～910.
9. as the manufacture method of the arbitrary described wear-resisting steel plate of claim 3～8, it is characterized in that tempering temperature is less than 350 ℃, preferred tempering temperature is 150～300 ℃.
10. as the manufacture method of the arbitrary described wear-resisting steel plate of claim 3～9, it is characterized in that described air cooling adopts stacking or cold bed cooling.
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