CN102691017A - Low-cost wear resistant steel plate with hardness of NM550 and manufacturing method thereof - Google Patents
Low-cost wear resistant steel plate with hardness of NM550 and manufacturing method thereof Download PDFInfo
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- CN102691017A CN102691017A CN2012100832691A CN201210083269A CN102691017A CN 102691017 A CN102691017 A CN 102691017A CN 2012100832691 A CN2012100832691 A CN 2012100832691A CN 201210083269 A CN201210083269 A CN 201210083269A CN 102691017 A CN102691017 A CN 102691017A
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Abstract
The invention discloses a low-cost wear resistant steel plate with a hardness of NM550 and a manufacturing method thereof. In the chemical composition of the steel plate, the content of expensive alloy elements, such as Ni, Mo, Nb, V and the like, is less than or equal to1.40%. The manufacturing method comprises the steps of: carrying out continuous casting to produce billets after smelting, heating the continuous casting billets, carrying out two-stage controlled rolling with a heavy and medium plate mill, carrying out controlled cooling after the rolling is finished at a temperature of 780-850 DEG C and cooling to 250-300 DEG C at a cooling speed of 5 DEG C per second or higher, preserving heat in a stack cooling or heat preserving pit for more than 120 minutes, and finally air-cooling to room temperature. The preferred scheme is to air-cool to room temperature after controlled cooling and temper 30-120 minutes at a temperature of 200-400 DEG C. The wear resistant steel plate provided by the invention has a hardness of HB545-570 and impact energy of over 23J at a temperature of minus 20 DEG C. Furthermore, the wear resistant steel plate has the advantages of stable mechanical performance, simpler production process and low cost.
Description
Technical field
The present invention relates to metallic substance, provide especially to can be used for making various ultra wear-resisting spare parts and the structural part metallic substance that has superstrength to require.
Technical background
Along with China's rapid economic development, wear resisting steel is had higher requirement---cost is low, wear resistance good, stable performance.Incomplete statistics according to 5 departments such as China Power, building materials, metallurgy, coal mining and agricultural machinery; The steel that annual spare part consumes owing to rubbing are more than 1,500,000 tons; With the used scraper conveyor in colliery is example, because be 1～200,000,000 yuan loss every year that [line wearing and tearing are caused.If consider again financial loss that other equipment wearings cause and steel consumption that will be very surprising.In addition, because China's wear resisting steel industry development is slower, wear-resistant steel products quality, performance are stable inadequately, at present in the middle of high-tech and national defense industry to the demand of high quality, high-performance abrasion-proof steel dependence on import almost completely.Therefore; Improve the quality and the performance of wear resisting steel; The ultra wear resisting steel of development of new high-performance, to reduce loss that causes owing to wearing and tearing and the deficiency that remedies domestic high quality, high-performance abrasion-proof steel, this development for the development of the national economy and national defense construction is all significant.
On cost of alloy, the ultra wear resisting steel HARDOX 600 that the design of Sweden SSAB steel plate ltd is produced has high carbon content and alloy content, so manufacturing cost is high.HARDOX 600 durometer levels of 8 ~ 30mm thickness that Sweden SSAB steel plate ltd produces are at HB570-HB640, and more noble alloy is adopted in its composition design, and wherein Ni 2.5%, Mo0.8%, B0.004%; And the above ultra wear-resisting steel plate HARDOX 500 of thickness 40mm, durometer level is at HB450-HB540, and noble alloy Ni wherein is 1.5%, and Mo is 0.60%, and B is 0.004%.On production technique, the wear-resisting steel plate of hardness more than HB500 adopts repeated hardening+tempered ME, and be very high at the treatment production cost, and the production cycle is long.In patent CN101698900, provided 500HB ultrahigh hardness wear resisting steel and production technique, but still need carry out heating quenching at 900 ~ 950 ℃, carry out 100 ~ 400 ℃ tempering then.Going up these alloyings and method of manufacture all can cause its cost high.In patent CN102230135A application; Adopt casting and heat treating method technology to make the martensite wear-resistant steel, its cost of alloy is low, but the traditional quenching and the mode of production of low-temperaturetempering are still adopted in thermal treatment; Receive the restriction of method of manufacture; The said method of manufacture of this patented claim can't prepare monolithic big area sheet material, and the big area wear resisting steel of thin-walled, is fit to the foundry high-abrasive material.
Under the condition that does not reduce the wear resisting steel performance, adopt new composition design and method of manufacture, can reduce manufacturing composition significantly.As with cheap alloying element Mn, Si, and add microalloy element Nb, the V of grain refining and precipitation strength, reduce the content of noble alloy element Ni, Mo, B, so cost is significantly reduced.
Summary of the invention
Slower to China's wear resisting steel industry development; Wear-resistant steel products quality, performance are stable inadequately; At present in the middle of high-tech and national defense industry to the demand of high quality, the high-performance abrasion-proof steel present situation of dependence on import almost completely, the object of the present invention is to provide ultra wear resisting steel that a kind of cost is low, performance is good and preparation method thereof.
The wear resisting steel that traditional technology production hardness surpasses NM500 adopts production technique to comprise: at first adopt high-carbon, heavy alloyed alloy alloyage process, next adopts complicated heat treatment technology, like twice or repeated hardening mode, and then low-temperaturetempering.This technology is because of the heat treatment mode of high alloy and heating for multiple times, and production cost of alloy and energy cost are all very high.
One of characteristic of the present invention is; The design of the composition of wear resisting steel adopts units such as more cheap Mn, Si usually to improve wear resistance, and add a small amount of grain refining and precipitation strength element nb, V, has significantly reduced the content of noble metal element Ni, Mo, Nb, V, B; On chemical ingredients; The overall control of noble alloy element Ni in the steel, Mo, Nb, V is≤1.4%, and with existing this rank wear resisting steel, its cost of alloy is low relatively.With the similar wear resisting steel phase transformation of offshore company, ton steel cost has descended nearly 40%.
Two of characteristic of the present invention is; The present invention compares with domestic and international same level wear resisting steel, on production technique, adopts plate mill to roll back direct tempering and off-line isothermal processes, or preferential scheme is to roll back press quenching+off-line temper; Do not need follow-up repeated hardening in the traditional processing technology; The Production Flow Chart of more traditional wear resisting steel is shorter, and is with short production cycle, greatly reduces production cost.
Technical scheme of the present invention is: a kind of low-cost wear-resisting steel plate of the NM550 of having hardness, and mass percent: C 0.25 ~ 0.30% according to chemical composition, Mn2.0 ~ 2.5%, Si 1.6 ~ 2.0%; Cr 1.0 ~ 1.5%, and Mo 0.20 ~ 0.30%, and Ni 0.5 ~ 1.0%, Nb0.01 ~ 0.06%; V0.01 ~ 0.04%, B0.001 ~ 0.0015%, S≤0.005%; P≤0.015%, [O+N]≤0.010%, surplus is iron and unavoidable impurities.
The purpose of this invention is to provide the preparation method of the low-cost wear-resisting steel plate of the above-mentioned NM550 of having hardness, specifically may further comprise the steps: at first, mass percent: C 0.25 ~ 0.30% according to chemical composition, Mn2.0 ~ 2.5%; Si 1.6 ~ 2.0%, and Cr 1.0 ~ 1.5%, and Mo 0.20 ~ 0.30%, and Ni 0.5 ~ 1.0%; Nb0.01 ~ 0.06%, V0.01 ~ 0.04%, B0.001 ~ 0.0015%, S≤0.005%; P≤0.015%, [O+N]≤0.010%, surplus is that iron and unavoidable impurities take by weighing with component; Become base through smelting the back continuous casting, continuously cast bloom adopts plate mill two stages controlled rolling through 1200-1250 ℃ of heating; 780-850 ℃ of finish to gauge, to roll the back and adopt controlled chilling, speed of cooling is>=5 ℃/s; Be chilled to 250 ~ 280 ℃ and carry out being incubated more than the 120min in cooling in heap or the holding pit, last air cooling is to room temperature, and obtaining thickness is the low-cost wear-resisting steel plate with NM550 hardness of 6-60mm.
Further, the also replaceable of this method of manufacture is: at first, and mass percent: C 0.25 ~ 0.30% according to chemical composition, Mn2.0 ~ 2.5%; Si 1.6 ~ 2.0%, and Cr 1.0 ~ 1.5%, and Mo 0.20 ~ 0.30%, and Ni 0.5 ~ 1.0%; Nb0.01 ~ 0.06%, V0.01 ~ 0.04%, B0.001 ~ 0.0015%, S≤0.005%; P≤0.015%, [O+N]≤0.010%, surplus is that iron and unavoidable impurities take by weighing with component, becomes base through smelting the back continuous casting; Continuously cast bloom adopts plate mill two stages controlled rolling through 1200-1250 ℃ of heating, 780-850 ℃ of finish to gauge, rolls the back and adopts controlled chilling; Speed of cooling is>=5 ℃/s, be chilled to 250 ~ 300 ℃ after again air cooling carry out tempering 30min ~ 120min between 200-400 ℃ to room temperature at tempering stove, obtaining thickness is the low-cost wear-resisting steel plate with NM550 hardness of 6-60mm.
Comparatively speaking, major advantage of the present invention comprises following several respects:
1) in the steel grade design, adopt less noble alloy content, total noble alloy content is less than 1.4%, and cost of alloy is low, and the external like product of cost of alloy reduces by 40%.
2) method of manufacture is simple.Be quickly cooled to cryogenic mode and follow-up isothermal processes after adopting plate mill to roll, or preferential temper mode, saved the repeated hardening operation, method of manufacture is simpler, and production energy consumption is lower.
3) the method for manufacture cycle is short.Adopt plate mill to roll the back isothermal processes or roll back cooling and off-line tempering mode fast, repeated hardening, the tempered technological process of production and production cycle of routine shortened dramatically.
4) the low-cost wear resisting steel that has NM550 hardness adopts tempered martensite+residual austenite tissue design, each item stable mechanical property of steel, and hardness is high, wear resistance is good, the long service life of product.
Description of drawings
Fig. 1 is low-cost ultra wear resisting steel NM550 method of manufacture synoptic diagram;
Fig. 2 is the stereoscan photograph of low-cost ultra wear resisting steel NM550 microstructure;
Fig. 3 is the transmission electron microscope photo of low-cost ultra wear resisting steel NM550 microstructure.
Embodiment
Below in conjunction with specific embodiment technical scheme of the present invention is further specified.
The present invention has adopted 15 embodiment, comprises that 3 kinds of composition design examples are as shown in table 1, has comprised A, B, three kinds of chemical ingredientss of C; In 15 instances of the method for manufacture that adopts, comprised different rolling and thermal treatment process, as shown in table 2.Finally, the mechanical property of steel plate of 15 embodiment that comprises the acquisition of 3 kinds of compositions (A-C) and 15 method of manufacture (1-15) is seen shown in the table 3.
Table 1: chemical ingredients of the present invention
| Embodiment | The mass percent of each chemical element |
| A | C 0.25%, Mn2.5%, and Si 2.0%, and Mo 0.30%, Nb0.06%, V0.04%, B0.0015%, Al 0.03%, and Ni 1.0%, and Cr 1.5%, S<=0.005%, P<=0.015%, [O+N]<=0.010%, all the other Fe and impurity |
| B | C 0.30%, Mn2.0%, and Si 1.6%, and Mo 0.20%, Nb0.01%, V0.01%, B0.001%, Al 0.03%, and Ni 0.5%, and Cr 1.5%, S<=0.005%, P<=0.015%, [O+N]<=0.010%, all the other Fe and impurity |
| C | C:0.27%, Mn2.2%, Si 1.8%, and Mo 0.26%, Nb0.03%, V0.02%, B0.002%, Al 0.02%, and Ni 0.8%, and Cr 1.25%, S<=0.005%, P<=0.015%, [O+N]<=0.010%, all the other Fe and impurity |
Table 2 method of manufacture of the present invention and processing parameter
The steel plate mechanical property of table 3 embodiment of the invention
Visible by table 3; In the mechanical property of a kind of low-cost wear resisting steel with NM550 hardness involved in the present invention; Between HB545-HB569 ,-20 ℃ of ballistic works reach more than 23, have preferable performance stability in the hardness of embodiment 1A-5B and 13A-15A steel.
Microstructure analysis according to embodiment 4B and 15A steel plate can be known; Microstructure is a low-temperaturetempering martensite; And the residual austenite tissue that under ESEM, can't distinguish, as shown in Figure 2, the martensite lath width is between 200-500nm in this tissue; It is less to have the carbide of separating out in the lath, therefore has impelling strength preferably.Through TEM analysis, between martensite lath, be distributed with the residual austenite tissue of black, in isothermal processes or drawing process; Carbon in the martensitic stucture will spread in this residual austenite; When carbide is separated out in reducing martensite, improved the stability of residual austenite, this stable residual austenite can turn round under powerful external force effect and become martensite; Improve the hardness of distorted area, thereby improve the wear resistance of steel.Therefore, it is stable that the present invention implements to obtain the tissue of steel, has high use properties.
Claims (3)
1. the low-cost wear-resisting steel plate with NM550 hardness is characterized in that, chemical ingredients is C 0.25 ~ 0.30% by mass percentage, Mn2.0 ~ 2.5%; Si 1.6 ~ 2.0%, and Cr 1.0 ~ 1.5%, and Mo 0.20 ~ 0.30%, and Ni 0.5 ~ 1.0%; Nb0.01 ~ 0.06%, V0.01 ~ 0.04%, B0.001 ~ 0.0015%, S≤0.005%; P≤0.015%, [O+N]≤0.010%, surplus is iron and unavoidable impurities.
2. one kind like right 1 described method of manufacture with low-cost wear-resisting steel plate of NM550 hardness, it is characterized in that: at first, and mass percent: C 0.25 ~ 0.30% according to chemical composition, Mn2.0 ~ 2.5%; Si 1.6 ~ 2.0%, and Cr 1.0 ~ 1.5%, and Mo 0.20 ~ 0.30%, and Ni 0.5 ~ 1.0%; Nb0.01 ~ 0.06%, V0.01 ~ 0.04%, B0.001 ~ 0.0015%, S≤0.005%; P≤0.015%, [O+N]≤0.010%, surplus is that iron and unavoidable impurities take by weighing with component, becomes base through smelting the back continuous casting; Continuously cast bloom adopts plate mill two stages controlled rolling through 1200-1250 ℃ of heating, 780-850 ℃ of finish to gauge, rolls the back and adopts controlled chilling; Speed of cooling is>=5 ℃/s, is chilled to 250 ~ 280 ℃ and carries out being incubated in cooling in heap or the holding pit
More than the 120min, last air cooling is to room temperature, and obtaining thickness is the low-cost wear resisting steel with NM550 hardness of 6-60mm.
3. one kind like right 1 described method of manufacture with low-cost wear-resisting steel plate of NM550 hardness, it is characterized in that: at first, and mass percent: C 0.25 ~ 0.30% according to chemical composition, Mn2.0 ~ 2.5%; Si 1.6 ~ 2.0%, and Cr 1.0 ~ 1.5%, and Mo 0.20 ~ 0.30%, and Ni 0.5 ~ 1.0%; Nb0.01 ~ 0.06%, V0.01 ~ 0.04%, B0.001 ~ 0.0015%, S≤0.005%; P≤0.015%, [O+N]≤0.010%, surplus is that iron and unavoidable impurities take by weighing with component; Become base through smelting the back continuous casting, continuously cast bloom adopts plate mill two stages controlled rolling through 1200-1250 ℃ of heating; 780-850 ℃ of finish to gauge, to roll the back and adopt controlled chilling, speed of cooling is>=5 ℃/s; After being chilled to 250 ~ 300 ℃ again air cooling carry out tempering 30min ~ 120min between 200-400 ℃ to room temperature at tempering stove, obtaining thickness is the low-cost wear-resisting steel plate with NM550 hardness of 6-60mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102943212A (en) * | 2012-12-09 | 2013-02-27 | 新余钢铁集团有限公司 | NM500 high-strength wear-resistant steel plate and heat treatment technique thereof |
| CN103146997A (en) * | 2013-03-28 | 2013-06-12 | 宝山钢铁股份有限公司 | Low-alloy high-toughness wear resistant steel plate and manufacturing method thereof |
| CN106929634A (en) * | 2017-03-31 | 2017-07-07 | 华南理工大学 | The method of continuous casting and rolling technique of sheet bar production Thin Specs abrasion-resistant stee NM450 |
| CN109937266A (en) * | 2017-06-21 | 2019-06-25 | 日本制铁株式会社 | Steel plate |
| CN110042306A (en) * | 2019-04-22 | 2019-07-23 | 桂林理工大学 | A kind of the NM600 wear-resisting steel plate and its production method of suitable worst hot case |
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| CN101698900A (en) * | 2009-09-02 | 2010-04-28 | 北京科技大学 | Production technology method of low content alloy ultrahigh hardness wear-resistant steel plate |
| CN101942616A (en) * | 2010-09-15 | 2011-01-12 | 北京科技大学 | Bainite steel plate with high elongation, high strength and low carbon and production method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943212A (en) * | 2012-12-09 | 2013-02-27 | 新余钢铁集团有限公司 | NM500 high-strength wear-resistant steel plate and heat treatment technique thereof |
| CN102943212B (en) * | 2012-12-09 | 2014-10-22 | 新余钢铁集团有限公司 | NM500 high-strength wear-resistant steel plate and heat treatment technique thereof |
| CN103146997A (en) * | 2013-03-28 | 2013-06-12 | 宝山钢铁股份有限公司 | Low-alloy high-toughness wear resistant steel plate and manufacturing method thereof |
| CN103146997B (en) * | 2013-03-28 | 2015-08-26 | 宝山钢铁股份有限公司 | A kind of low-alloy high-flexibility wear-resistant steel plate and manufacture method thereof |
| CN106929634A (en) * | 2017-03-31 | 2017-07-07 | 华南理工大学 | The method of continuous casting and rolling technique of sheet bar production Thin Specs abrasion-resistant stee NM450 |
| CN106929634B (en) * | 2017-03-31 | 2019-08-20 | 华南理工大学 | The method of continuous casting and rolling technique of sheet bar production thin gauge abrasion-resistant stee |
| CN109937266A (en) * | 2017-06-21 | 2019-06-25 | 日本制铁株式会社 | Steel plate |
| EP3502296A4 (en) * | 2017-06-21 | 2019-09-04 | Nippon Steel Corporation | Steel sheet |
| CN109937266B (en) * | 2017-06-21 | 2020-07-03 | 日本制铁株式会社 | Steel plate |
| CN110042306A (en) * | 2019-04-22 | 2019-07-23 | 桂林理工大学 | A kind of the NM600 wear-resisting steel plate and its production method of suitable worst hot case |
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Application publication date: 20120926 |