CN108060356A - A kind of preparation method of niobium nitrogen microalloying ledge cast steel - Google Patents
A kind of preparation method of niobium nitrogen microalloying ledge cast steel Download PDFInfo
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- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 29
- CFJRGWXELQQLSA-UHFFFAOYSA-N azanylidyneniobium Chemical compound [Nb]#N CFJRGWXELQQLSA-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000010955 niobium Substances 0.000 claims abstract description 34
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 23
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000009628 steelmaking Methods 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 238000010791 quenching Methods 0.000 claims abstract description 15
- 230000000171 quenching effect Effects 0.000 claims abstract description 15
- 238000005496 tempering Methods 0.000 claims abstract description 15
- 238000000465 moulding Methods 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 12
- 230000006698 induction Effects 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 9
- 238000007670 refining Methods 0.000 claims abstract description 7
- 239000011449 brick Substances 0.000 claims abstract description 6
- 150000004767 nitrides Chemical class 0.000 claims abstract description 6
- 238000001556 precipitation Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims 1
- 238000005272 metallurgy Methods 0.000 abstract description 2
- UNASZPQZIFZUSI-UHFFFAOYSA-N methylidyneniobium Chemical compound [Nb]#C UNASZPQZIFZUSI-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 239000003245 coal Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- -1 niobium nitrides Chemical class 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
本发明公布一种铌氮微合金化槽帮铸钢的制备方法，属于冶金技术领域。制备方法主要是通过配料、感应炉炼钢、浇注成型、调质热处理等工艺过程进行制备。其中，感应炉炼钢时，其熔化期的碳含量控制在0.08％以下，精炼期加入微合金元素铌的同时通过坩埚底部设置的透气砖向钢液充氮，然后再按照成分要求调整碳含量。该方法制备的槽帮铸钢的主要化学成分及其含量为：C：0.26～0.35％；Si：0.60～0.90％；Mn：1.10～2.00％；P≤0.010％；S：≤0.010％；Nb：0.02～0.06％；Nb/N＞7～9，其余含量为Fe。经过上述处理制得的槽帮铸钢，可以保证铌主要以氮化物型式析出，减少铌的碳化物析出，其铸钢抗拉强度超过900MPa，冲击韧性达到50J/cm2以上，满足槽帮铸钢对高强韧指标的要求。The invention discloses a method for preparing niobium-nitrogen micro-alloyed side cast steel, which belongs to the technical field of metallurgy. The preparation method is mainly prepared through processes such as batching, induction furnace steelmaking, pouring molding, quenching and tempering heat treatment, and the like. Among them, during the induction furnace steelmaking, the carbon content in the melting period is controlled below 0.08%, and the microalloying element niobium is added in the refining period, and the molten steel is filled with nitrogen through the breathable brick installed at the bottom of the crucible, and then the carbon content is adjusted according to the composition requirements. . The main chemical composition and content of the channel side cast steel prepared by the method are: C: 0.26-0.35%; Si: 0.60-0.90%; Mn: 1.10-2.00%; P≤0.010%; S:≤0.010%; Nb : 0.02～0.06%; Nb/N>7～9, the remaining content is Fe. The channel side cast steel obtained through the above treatment can ensure that niobium is mainly precipitated in the form of nitride and reduce the precipitation of niobium carbide. Steel requirements for high strength and toughness indicators.
Description
技术领域technical field
本发明属于冶金技术领域，涉及一种铌氮微合金化槽帮铸钢的制备方法。The invention belongs to the technical field of metallurgy, and relates to a method for preparing niobium-nitrogen micro-alloyed groove side cast steel.
背景技术Background technique
中部槽是刮板输送机的主要部分组成，通常每台刮板输送机都具有100多节中部槽，无论是按重量计，还是按成本计，都占整个刮板输送机的70％～80％，因此中部槽是使用量和消耗量最大的部件。每节中部槽在结构上普遍采用整体铸造铲板槽帮、挡板槽帮与高强度耐磨合金中板及底板组焊而成。其中，槽帮位于中部槽的两侧，包括铲板槽帮、挡板槽帮和少量异型槽帮，在结构上由整体铸造而成。The middle trough is the main part of the scraper conveyor. Usually, each scraper conveyor has more than 100 middle troughs, which account for 70% to 80% of the entire scraper conveyor in terms of weight and cost. %, so the middle tank is the most used and consumed part. In terms of structure, the middle groove of each section is generally welded by integrally cast spade plate groove sides, baffle plate groove sides, high-strength wear-resistant alloy middle plates and bottom plates. Among them, the groove side is located on both sides of the middle groove, including the blade side, the baffle side and a small amount of special-shaped side, which are integrally cast in structure.
目前，槽帮材料普遍采用的是ZG30MnSi，由于其强韧性较低，耐磨性能不好，过煤量一般在600万t左右，低于国外1 500万t以上的水平，难以满足大采高采煤工作面的要求，其过快报废和频繁更换严重制约了煤炭生产企业的经济效益，所以研制高可靠性槽帮具有重要的意义和价值。At present, ZG30MnSi is generally used as the channel side material. Due to its low strength and toughness and poor wear resistance, the coal passing rate is generally about 6 million tons, which is lower than the level of more than 15 million tons in foreign countries, and it is difficult to meet the large mining height. The requirements of the coal mining face, its rapid scrapping and frequent replacement seriously restrict the economic benefits of coal production enterprises, so the development of high reliability channel side is of great significance and value.
为此，人们在ZG30MnSi化学成分基础上，通过添加合金化元素，如Ni、Cr、Mo和稀土等开发了一些槽帮材料，其最高强度为1800MPa，对应的硬度为55.1HRC，但是其韧性太低，仅为15J/cm-2，强韧性匹配并不合理，已有实践表明，这样的槽帮材料，其使用效果并不会太理想。有的材料虽然韧性较高，却强度较低，这也不能满足槽帮材料的要求。For this reason, people have developed some groove side materials by adding alloying elements such as Ni, Cr, Mo and rare earth on the basis of the chemical composition of ZG30MnSi. The highest strength is 1800MPa and the corresponding hardness is 55.1HRC, but its toughness is too high Low, only 15J/cm -2 , the matching of strength and toughness is unreasonable. Practice has shown that the use effect of such groove side materials is not ideal. Although some materials have high toughness, they have low strength, which cannot meet the requirements of groove side materials.
铌是钢中最有效的微合金化元素，其在钢中的作用强于Ti、V，且储量丰富，价格低廉，有着很大的应用前景。钢中加入铌不仅可以提高钢的强度、韧性，还可以提高钢的耐磨性和耐腐蚀性，以及降低钢脆性转变温度等。Niobium is the most effective microalloying element in steel. Its effect in steel is stronger than that of Ti and V. It has abundant reserves and low price, so it has great application prospects. Adding niobium to steel can not only improve the strength and toughness of steel, but also improve the wear resistance and corrosion resistance of steel, and reduce the brittle transition temperature of steel.
因此，本项申请以常用槽帮材料ZG30MnSi为基础，通过铌氮的微合金化作用，来实现强韧性的合理匹配，达到槽帮铸钢的高强韧性。同时，考虑到碳含量较高时，铌的碳化物尺寸较大大，这不仅对铸钢性能不利，而且影响铌的细化晶粒效果，因此为了充分发挥铌的微合金化作用，提出了以增加铌的氮化物析出量为主要目的的制备方法。Therefore, this application is based on the commonly used channel side material ZG30MnSi, through the microalloying of niobium nitrogen, to achieve a reasonable match of strength and toughness, and to achieve the high strength and toughness of channel side cast steel. At the same time, considering that when the carbon content is high, the carbide size of niobium is relatively large, which is not only unfavorable to the performance of cast steel, but also affects the grain refinement effect of niobium. Therefore, in order to give full play to the microalloying effect of niobium, the following A preparation method whose main purpose is to increase the amount of niobium nitride precipitation.
发明内容Contents of the invention
一种铌氮微合金化槽帮铸钢的制备方法主要是以增加铌的氮化物析出量为主要目的而提出的。其制备思路是对感应炉炼钢时熔化期的碳含量进行控制，在精炼期加入铌的同时进行充氮处理，之后再调整碳含量。A method for preparing niobium-nitrogen micro-alloyed channel side cast steel is proposed mainly for the main purpose of increasing the amount of niobium nitride precipitation. The idea of its preparation is to control the carbon content in the melting period during induction furnace steelmaking, to add niobium in the refining period and carry out nitrogen filling treatment at the same time, and then adjust the carbon content.
本发明通过以下技术措施实现：The present invention is realized through the following technical measures:
一种铌氮微合金化槽帮铸钢的制备方法，其特征在于：所述的材料规定成分配料，经感应炉炼钢、浇注成型、调质热处理工艺过程后进行制备；A method for preparing niobium-nitrogen micro-alloyed channel side cast steel, characterized in that: the specified composition of the material is prepared after the process of induction furnace steelmaking, pouring molding, quenching and tempering heat treatment;
其中在感应炉炼钢时，其熔化期的碳含量控制在0.08％以下，精炼期加入微合金元素铌的同时通过坩埚底部设置的透气砖向钢液充氮，在保证钢液铌含量与氮含量之比在7～9的范围内之后，再按照成分要求调整碳含量。Among them, in the induction furnace steelmaking, the carbon content in the melting period is controlled below 0.08%, and the microalloying element niobium is added in the refining period, and the molten steel is filled with nitrogen through the breathable brick installed at the bottom of the crucible, so as to ensure the niobium content of the molten steel and the nitrogen content. After the content ratio is within the range of 7-9, the carbon content is adjusted according to the composition requirements.
进一步地，所述的熔化期的碳含量控制在0.08％以下，是为保证铸钢中铌以氮化物形式析出；该碳含量通过控制配料时的碳含量以及炼钢时的氧化作用来保证。Further, the carbon content in the melting period is controlled below 0.08% to ensure that the niobium in the cast steel is precipitated in the form of nitrides; the carbon content is guaranteed by controlling the carbon content during batching and the oxidation during steelmaking.
进一步地，所述的铌氮微合金化槽帮铸钢的化学成分及其质量百分比含量控制为：C：0.26～0.35％；Si：0.60～0.90％；Mn：1.10～2.00％；P≤0.025％；S：≤0.025％；Nb：0.02～0.06％；Nb/N＞7～9；其余含量为Fe。Further, the chemical composition and mass percentage content of the niobium-nitrogen micro-alloyed channel side cast steel are controlled as follows: C: 0.26-0.35%; Si: 0.60-0.90%; Mn: 1.10-2.00%; P≤0.025 %; S: ≤0.025%; Nb: 0.02-0.06%; Nb/N>7-9; the remaining content is Fe.
所述的Nb/N＞7～9，是从成分方面保证铸钢中铌主要以氮化物形式析出。The said Nb/N>7-9 is to ensure that the niobium in the cast steel is mainly precipitated in the form of nitrides from the aspect of composition.
进一步地，所述浇注成型工艺为：浇注成型温度为1550～1580℃、浇注速度为70～80m/s。控制浇注温度和浇注速度是为了避免铸钢晶粒迅速长大，影响铌的氮化物的细化晶粒的效果。Further, the pouring molding process is as follows: the pouring molding temperature is 1550-1580° C., and the pouring speed is 70-80 m/s. The purpose of controlling the pouring temperature and pouring speed is to avoid the rapid growth of cast steel grains and affect the grain refinement effect of niobium nitrides.
进一步地，所述调质热处理工艺为：淬火温为度870～890℃、回火温度为500～520℃。只有在本发明规定的调质工艺条件下，该钢种的成分才能达到最佳效果，确保该铌氮微合金化槽帮铸钢能够达到抗拉强度超过900MPa，冲击韧性达到50J/cm2以上，满足槽帮铸钢对高强韧指标的要求。Further, the quenching and tempering heat treatment process is as follows: the quenching temperature is 870-890°C, and the tempering temperature is 500-520°C. Only under the quenching and tempering process conditions specified in the present invention can the composition of the steel achieve the best effect, ensuring that the niobium-nitrogen microalloyed channel side cast steel can achieve a tensile strength exceeding 900MPa and an impact toughness of more than 50J/ cm2 , to meet the requirements of channel side cast steel for high strength and toughness.
本发明的有益效果：Beneficial effects of the present invention:
利用本发明提出的制备方法制备，可以保证铌主要以氮化物型式析出，减少铌的碳化物的析出，其抗拉强度超过900MPa，冲击韧性达到50J/cm2以上，满足槽帮铸钢对高强韧指标的要求。Utilize the preparation method proposed in the present invention to prepare, can ensure that niobium is mainly precipitated in the form of nitride, reduce the precipitation of niobium carbide, its tensile strength exceeds 900MPa, and impact toughness reaches more than 50J/ cm2 , which meets the requirements of channel side cast steel for high strength toughness index requirements.
具体实施方式Detailed ways
现将本发明的实施例具体叙述于后。Embodiments of the present invention will now be described in detail below.
实施例对本发明的技术方案做进一步描述。实施例仅用于说明本发明，而不是以任何方式来限制本发明。The embodiment further describes the technical solution of the present invention. The examples are only used to illustrate the present invention and not to limit the present invention in any way.
本发明提出的一种铌氮微合金化槽帮铸钢的制备方法，主要是主要利用配料、感应炉炼钢、浇注成型、调质热处理等工艺过程后进行。其中，感应炉炼钢时，其熔化期的碳含量控制在0.08％以下，精炼期加入微合金元素铌的同时通过坩埚底部设置的透气砖向钢液充氮，在保证钢液铌含量与氮含量之比在7～9的范围内之后，再按照成分要求调整碳含量。在取样测试其化学成分满足设计要求时，炼钢结束并转入下一工序进行浇注成型，其浇注成型温度为1550～1580℃、浇注速度为70～80m/s；空冷至室温脱模后，再进行调质热处理，其淬火温度为870～890℃，回火温度为500～520℃。该槽帮铸钢的化学成分及其质量百分比含量控制为：C：0.23～0.35％；Si：0.60～0.90％；Mn：1.10～2.00％；P≤0.025％；S：≤0.025％；Nb：0.02～0.06％；Nb/N＞7～9；其余含量为Fe。The preparation method of a niobium-nitrogen micro-alloyed channel side cast steel proposed by the present invention is mainly carried out after the process of batching, induction furnace steelmaking, pouring molding, quenching and tempering heat treatment and the like. Among them, during the induction furnace steelmaking, the carbon content in the melting period is controlled below 0.08%, and the microalloy element niobium is added in the refining period, and the molten steel is filled with nitrogen through the breathable brick installed at the bottom of the crucible, so as to ensure the niobium content of the molten steel and the nitrogen content. After the content ratio is within the range of 7-9, the carbon content is adjusted according to the composition requirements. When the chemical composition of the sample meets the design requirements, the steelmaking is completed and transferred to the next process for pouring molding. The pouring molding temperature is 1550-1580°C and the pouring speed is 70-80m/s; after air cooling to room temperature and demoulding, Then carry out quenching and tempering heat treatment, the quenching temperature is 870-890°C, and the tempering temperature is 500-520°C. The chemical composition and mass percentage content of the channel side cast steel are controlled as follows: C: 0.23-0.35%; Si: 0.60-0.90%; Mn: 1.10-2.00%; P≤0.025%; S: ≤0.025%; Nb: 0.02～0.06%; Nb/N>7～9; the rest content is Fe.
实施例1Example 1
按上述化学成分进行配料，配料时碳含量为0.06％。之后，进行感应炉炼钢，通过氧化作用，保证熔化期的碳含量不高于0.08％；在转入精炼期的后期加入0.04％的微合金元素铌，同时通过坩埚底部设置的透气砖向钢液充氮，在其含量达到0.0056％之后，再按照成分要求调整碳含量。在取样测试其化学成分满足设计要求时，炼钢结束并转入下一工序进行浇注成型，其浇注成型温度为1570℃、浇注速度为72m/s；空冷至室温脱模后，再进行调质热处理，其淬火温度为880℃，回火温度为510℃。其中，本实施例炼钢后测得的化学成分为(质量分数/％)为：0.25C，0.7Si,1.22Mn，0.012S，0.011P，0.035Nb，0.004N。Carry out batching according to above-mentioned chemical composition, carbon content is 0.06% during batching. After that, induction furnace steelmaking is carried out to ensure that the carbon content in the melting period is not higher than 0.08% through oxidation; in the later stage of the refining period, 0.04% of microalloying element niobium is added, and at the same time, the air brick installed at the bottom of the crucible is used to supply the steel Liquid nitrogen is filled, and after its content reaches 0.0056%, the carbon content is adjusted according to the composition requirements. When the chemical composition of the sample meets the design requirements, the steelmaking is completed and transferred to the next process for pouring molding. The pouring molding temperature is 1570°C and the pouring speed is 72m/s; air cooling to room temperature demoulding, and then quenching and tempering For heat treatment, the quenching temperature is 880°C and the tempering temperature is 510°C. Wherein, the chemical composition (mass fraction/%) measured after steelmaking in this embodiment is: 0.25C, 0.7Si, 1.22Mn, 0.012S, 0.011P, 0.035Nb, 0.004N.
对上述方法制备的槽帮进行取样分析，结果表明，金相组织观察结果显示，未观察到铌的碳化物，力学性能测试结果显示，其抗拉强度超过920MPa，冲击韧性达到56J/cm2以上，表明该槽帮铸钢具有较高的强韧性。Sampling and analysis of the groove side prepared by the above method shows that the metallographic observation results show that niobium carbides are not observed, and the mechanical property test results show that its tensile strength exceeds 920MPa, and its impact toughness reaches more than 56J/cm 2 , indicating that the channel side cast steel has high strength and toughness.
实施例2Example 2
按上述化学成分进行配料，配料时碳含量为0.07％。之后，进行感应炉炼钢，通过氧化作用，保证熔化期的碳含量不高于0.08％；在转入精炼期的后期加入0.06％的微合金元素铌，同时通过坩埚底部设置的透气砖向钢液充氮，在其含量达到0.0086％之后，再按照成分要求调整碳含量。在取样测试其化学成分满足设计要求时，炼钢结束并转入下一工序进行浇注成型，其浇注成型温度为1560℃、浇注速度为75m/s；空冷至室温脱模后，再进行调质热处理，其淬火温度为870℃，回火温度为500℃。其中，本实施例炼钢后测得的化学成分为(质量分数/％)为：0.31C，0.8Si,1.62Mn，0.019S，0.020P，0.056Nb，0.0079N。Carry out batching according to above-mentioned chemical composition, carbon content is 0.07% during batching. Afterwards, induction furnace steelmaking is carried out to ensure that the carbon content in the melting period is not higher than 0.08% through oxidation; in the later stage of the refining period, 0.06% of microalloying element niobium is added, and at the same time, the air-permeable bricks installed at the bottom of the crucible are supplied to the steel. Liquid nitrogen is filled, and after its content reaches 0.0086%, the carbon content is adjusted according to the composition requirements. When the chemical composition of the sample meets the design requirements, the steelmaking is completed and transferred to the next process for pouring molding. The pouring molding temperature is 1560°C and the pouring speed is 75m/s; air cooling to room temperature demoulding, and then quenching and tempering For heat treatment, the quenching temperature is 870°C and the tempering temperature is 500°C. Wherein, the chemical composition (mass fraction/%) measured after steelmaking in this embodiment is: 0.31C, 0.8Si, 1.62Mn, 0.019S, 0.020P, 0.056Nb, 0.0079N.
对上述方法制备的槽帮进行取样分析，结果表明，金相组织观察结果显示，未观察到铌的碳化物，力学性能测试结果显示，其抗拉强度超过1010MPa，冲击韧性达到52J/cm2以上，表明该槽帮铸钢具有较高的强韧性。Sampling and analysis of the groove side prepared by the above method shows that the metallographic observation results show that niobium carbides are not observed, and the mechanical performance test results show that its tensile strength exceeds 1010MPa, and its impact toughness reaches more than 52J/cm 2 , indicating that the channel side cast steel has high strength and toughness.
由实施例可见，采用本发明提出的铌氮微合金化槽帮铸钢的制备方法制成的槽帮，保证铌主要以氮化物形式析出，使铌的微合金化作用大大提高，其结果是使槽帮获得较高的强韧性指标，满足槽帮铸钢的服役要求。As can be seen from the examples, adopting the method for preparing the niobium-nitrogen microalloyed channel side cast steel proposed by the present invention ensures that the niobium is mainly precipitated in the form of nitrides, so that the microalloying of niobium is greatly improved, and the result is The channel side can obtain a higher strength and toughness index, which meets the service requirements of the channel side cast steel.
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| CN109182691A (en) * | 2018-10-17 | 2019-01-11 | 北京科技大学 | The heat treatment method of carbon cast steel in a kind of microalloying |
| CN112981068A (en) * | 2021-02-02 | 2021-06-18 | 北京科技大学 | Method for improving toughness of microalloyed ledge steel casting by utilizing deformation induced precipitation |
| CN115233091A (en) * | 2022-06-23 | 2022-10-25 | 中煤张家口煤矿机械有限责任公司 | A new type of micro-alloyed trough cast steel and preparation method thereof |
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| CN104911453A (en) * | 2015-06-26 | 2015-09-16 | 上海宏钢电站设备铸锻有限公司 | Preparation process of cast steel material capable of resisting high temperature of 620 DEG C |
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| CN109182691A (en) * | 2018-10-17 | 2019-01-11 | 北京科技大学 | The heat treatment method of carbon cast steel in a kind of microalloying |
| CN112981068A (en) * | 2021-02-02 | 2021-06-18 | 北京科技大学 | Method for improving toughness of microalloyed ledge steel casting by utilizing deformation induced precipitation |
| CN112981068B (en) * | 2021-02-02 | 2022-02-11 | 北京科技大学 | Method for improving toughness of microalloyed ledge steel casting by utilizing deformation induced precipitation |
| CN115233091A (en) * | 2022-06-23 | 2022-10-25 | 中煤张家口煤矿机械有限责任公司 | A new type of micro-alloyed trough cast steel and preparation method thereof |
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