CN103215526B - Centrifugally-cast high-carbon high-alloy steel and heat treatment method thereof - Google Patents
Centrifugally-cast high-carbon high-alloy steel and heat treatment method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 34
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 title abstract description 36
- 238000005496 tempering Methods 0.000 claims abstract description 34
- 238000005728 strengthening Methods 0.000 claims abstract description 24
- 238000010791 quenching Methods 0.000 claims abstract description 16
- 230000000171 quenching effect Effects 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 24
- 238000005266 casting Methods 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims 8
- 238000009413 insulation Methods 0.000 claims 2
- 239000003607 modifier Substances 0.000 claims 2
- 229910052758 niobium Inorganic materials 0.000 claims 1
- 238000009750 centrifugal casting Methods 0.000 abstract description 16
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- 238000004519 manufacturing process Methods 0.000 abstract description 3
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- 229910052761 rare earth metal Inorganic materials 0.000 description 6
- 150000002910 rare earth metals Chemical class 0.000 description 6
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- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
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- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
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- 229910001145 Ferrotungsten Inorganic materials 0.000 description 2
- 229910000628 Ferrovanadium Inorganic materials 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
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Abstract
本发明涉及一种离心铸造高碳高合金钢及其热处理方法，该高碳高合金钢的化学成分及重量百分比为：C1.5-3.8%，W2-10%，Cr3-10%，Mo2-8%，V4-10%，Nb0-3%，Mn0.2-0.8%，RE0.1-0.4%，Si≤1.0%，Al≤0.8%，Ni≤0.3%，余量为Fe和微量不可避免杂质。其热处理方法依次包括调质处理、固溶强化处理、弥散强化处理。该高碳高合金钢中以马氏体为基体，含大量碳化物硬质相，具有良好的耐磨性能，其热处理方法大大缩短了热处理周期，提高了工作效率，降低了生产成本，经该方法处理后的高碳高合金钢，碳化物组织分布均匀，表面质量好。The invention relates to a centrifugal casting high-carbon high-alloy steel and its heat treatment method. The chemical composition and weight percentage of the high-carbon high-alloy steel are: C1.5-3.8%, W2-10%, Cr3-10%, Mo2- 8%, V4-10%, Nb0-3%, Mn0.2-0.8%, RE0.1-0.4%, Si≤1.0%, Al≤0.8%, Ni≤0.3%, the balance is Fe and trace is unavoidable Impurities. The heat treatment method includes quenching and tempering treatment, solid solution strengthening treatment, and dispersion strengthening treatment in sequence. The high-carbon high-alloy steel uses martensite as the matrix, contains a large amount of carbide hard phases, and has good wear resistance. The heat treatment method greatly shortens the heat treatment cycle, improves work efficiency, and reduces production costs. The high-carbon high-alloy steel treated by the method has uniform distribution of carbide structure and good surface quality.
Description
技术领域technical field
本发明属于金属材料热处理技术领域，特别涉及一种采用离心铸造的高碳高合金材料及其热处理方法。The invention belongs to the technical field of heat treatment of metal materials, in particular to a high-carbon high-alloy material adopting centrifugal casting and a heat treatment method thereof.
背景技术Background technique
工业应用离心铸造高碳高合金材料一般含有大量W、Cr、Mo、V等元素，合金元素比重差别大，出现偏析，使用中导致铸造合金钢整体性能大大降低。热处理可以改变高碳高合金钢微观组织，调整碳化物分布状态，但是由于材料化学成分差异和铸造条件不同，对应热处理制度截然不同。中国发明专利CN101240402A公开了“一种复合轧辊用铸造高硼高速钢及其热处理方法”，材料成分百分比为C0.2-1.0%，B1.0-2.5%，Cr3.5-5.0%，Si0.5-0.9%，Mn0.6-1.3%，V2.0-10%，Ni0.5-1.5%，Mo1.0-4.0%，W0.2-4.0%，Nb0.1-2.0%，S≤0.04%，P≤0.04%，其余为Fe，通过860-880℃退火、1020-1150℃淬火和500-550℃二次回火工艺后，材料硬度为56.3HRC，冲击韧性为10.6J/cm2，断裂韧性24.5MPa·m1/2，抗拉强度828MPa，耐磨性、抗冲击性能大幅度提高。中国专利“一种低裂纹型高速钢轧辊及其离心铸造方法”，公开号CN1803339A，其化学成分重量百分比为：C1.5-2.0%，W3.0-6.0%，Mo1.5-3.0%，V3.0-10%，B1.0-2.5%，Cr3.5-10.0%，Ni1.5-3.0%，Mn＜1.5%，Si＜1.5%，RE0.08-0.20%，K0.05-0.15%，Mg0.04%-0.10%，其中0.20%＜RE+K+Mg＜0.40%，其余为Fe和不可避免的微量杂质，离心铸造后进行热处理，热处理制度为950-1150℃正火和500-600℃回火，硬度为65.4HRC，抗拉强度为1245MPa，冲击韧性为16.3J/cm2，断裂韧性为36.8MPa·m1/2’，该发明获得的轧辊材料具有良好的使用寿命。为了获得更高硬度和耐磨性，一般需要提高碳元素和合金元素含量，当碳含量增加时，热处理过程中常因热处理制度不当造成材料出现裂纹，现有热处理制度难以应用到铸造高碳高合金材料热处理中。Industrial applications Centrifugal casting high-carbon high-alloy materials generally contain a large amount of elements such as W, Cr, Mo, V, etc. The proportion of alloy elements varies greatly, and segregation occurs, which leads to a great decrease in the overall performance of cast alloy steel during use. Heat treatment can change the microstructure of high-carbon and high-alloy steel and adjust the distribution of carbides. However, due to the difference in chemical composition of materials and different casting conditions, the corresponding heat treatment systems are completely different. Chinese invention patent CN101240402A discloses "a cast high-boron high-speed steel for composite rolls and its heat treatment method", the material composition percentage is C0.2-1.0%, B1.0-2.5%, Cr3.5-5.0%, Si0. 5-0.9%, Mn0.6-1.3%, V2.0-10%, Ni0.5-1.5%, Mo1.0-4.0%, W0.2-4.0%, Nb0.1-2.0%, S≤0.04 %, P≤0.04%, and the rest is Fe. After annealing at 860-880°C, quenching at 1020-1150°C and secondary tempering at 500-550°C, the hardness of the material is 56.3HRC, the impact toughness is 10.6J/cm 2 , and the fracture The toughness is 24.5MPa·m 1/2 , the tensile strength is 828MPa, and the wear resistance and impact resistance are greatly improved. Chinese patent "a low-crack high-speed steel roll and its centrifugal casting method", publication number CN1803339A, its chemical composition weight percentage is: C1.5-2.0%, W3.0-6.0%, Mo1.5-3.0%, V3.0-10%, B1.0-2.5%, Cr3.5-10.0%, Ni1.5-3.0%, Mn<1.5%, Si<1.5%, RE0.08-0.20%, K0.05-0.15 %, Mg0.04%-0.10%, of which 0.20%<RE+K+Mg<0.40%, the rest is Fe and unavoidable trace impurities, heat treatment after centrifugal casting, the heat treatment system is 950-1150 ℃ normalizing and 500 Tempered at -600°C, the hardness is 65.4HRC, the tensile strength is 1245MPa, the impact toughness is 16.3J/cm 2 , and the fracture toughness is 36.8MPa·m 1/2 '. The roll material obtained by the invention has a good service life. In order to obtain higher hardness and wear resistance, it is generally necessary to increase the content of carbon and alloy elements. When the carbon content increases, cracks often occur in the material due to improper heat treatment system during heat treatment. The existing heat treatment system is difficult to apply to casting high carbon and high alloy Material heat treatment.
发明内容Contents of the invention
本发明目的在于提供一种离心铸造高碳高合金钢，该高碳高合金钢中以马氏体为基体，含大量碳化物硬质相，硬度高，产品硬度达67-69HRC，具有良好的耐磨性能。The purpose of the present invention is to provide a centrifugal casting high-carbon high-alloy steel. The high-carbon high-alloy steel uses martensite as the matrix, contains a large amount of carbide hard phases, and has high hardness. The product has a hardness of 67-69HRC and has good wear resistance.
本发明的另一目的还在于提供上述高碳高合金钢的热处理方法，经过该方法热处理后的高碳高合金钢，碳化物组织分布均匀，表面质量好，没有任何裂纹出现，硬度提高明显，且大大缩短了热处理周期，提高工作效率，降低了生产成本。Another object of the present invention is to provide a heat treatment method for the above-mentioned high-carbon high-alloy steel. The high-carbon high-alloy steel after heat treatment by this method has uniform distribution of carbides, good surface quality, no cracks, and obvious increase in hardness. Moreover, the heat treatment cycle is greatly shortened, the work efficiency is improved, and the production cost is reduced.
为达到以上技术目的，本发明提供以下技术方案：In order to achieve the above technical purpose, the present invention provides the following technical solutions:
一种离心铸造高碳高合金钢，其化学成分及重量百分比为：C1.5-3.8%，W2-10%，Cr3-10%，Mo2-8%，V4-10%，Nb0-3%，Mn0.2-0.8%，RE0.1-0.4%，Si≤1.0%，Al≤0.8%，Ni≤0.3%，余量为Fe和微量不可避免杂质。所述离心铸造高碳高合金钢主要原料按重量配比成分及制备工艺如下：A centrifugal casting high-carbon high-alloy steel, its chemical composition and weight percentage are: C1.5-3.8%, W2-10%, Cr3-10%, Mo2-8%, V4-10%, Nb0-3%, Mn0.2-0.8%, RE0.1-0.4%, Si≤1.0%, Al≤0.8%, Ni≤0.3%, the balance is Fe and trace unavoidable impurities. The composition and preparation process of the main raw materials of the centrifugally cast high-carbon high-alloy steel are as follows:
1）将800份轧制用顶头废钢，20-130份市售钨铁（钨含量75-85%），40-150份市售微碳铬铁（铬含量70-75%，碳含量小于0.15%），30-130份市售钼铁（钼含量60-70%），50-145份市售钒铁（钒含量70-80%）为主原料，350-1200份市售生铁（碳含量3-4%）或10-35份石墨为增碳剂，混合加热熔化成钢水。钢水熔清后，加入30-100份市售硅铁（硅含量8-10%）进行预脱氧，加入1-8份铝块进行终脱氧。1) Mix 800 parts of rolling head scrap steel, 20-130 parts of commercially available ferrotungsten (tungsten content 75-85%), 40-150 parts of commercially available micro-carbon ferrochromium (chromium content 70-75%, carbon content less than 0.15 %), 30-130 parts of commercially available ferromolybdenum (molybdenum content 60-70%), 50-145 parts of commercially available ferro-vanadium (content of vanadium 70-80%) as the main raw material, 350-1200 parts of commercially available pig iron (carbon content 3-4%) or 10-35 parts of graphite as recarburizer, mixed and heated to melt into molten steel. After the molten steel is melted, add 30-100 parts of commercially available ferrosilicon (8-10% silicon content) for pre-deoxidation, and add 1-8 parts of aluminum block for final deoxidation.
2）炉前调整成分合格后升温至1600-1650℃，而后出炉。加入1-13份破碎粒度为6-18mm市售稀土硅铁合金小块（稀土含量30-40%），稀土硅铁合金小块经160-240℃烘干以后置于浇包底部，用包内冲入法对钢水进行变质处理，高碳高合金钢钢水预制完成。2) After adjusting the ingredients before the furnace, the temperature is raised to 1600-1650°C, and then it is released from the furnace. Add 1-13 parts of commercially available rare earth ferrosilicon alloy pieces with a crushing particle size of 6-18mm (rare earth content 30-40%), place the rare earth ferrosilicon alloy pieces at the bottom of the ladle after drying at 160-240°C, and use the inside of the ladle to punch The molten steel is modified by the imported method, and the high-carbon and high-alloy steel molten steel is prefabricated.
3）将预制好的钢水浇入到具有一定旋转速度的卧式离心浇铸机内进行离心浇铸，铸型采用双层金属型，铸型涂料采用水载体涂料（含93-95%石英粉，5-7%水玻璃和水）。将铸型预热到160-260℃时喷涂料，涂料厚度为2-5mm，完成后，加热到220-340℃消除涂料中水分。3) Pour the prefabricated molten steel into a horizontal centrifugal casting machine with a certain rotation speed for centrifugal casting. The casting mold adopts a double-layer metal mold, and the casting mold coating adopts water carrier coating (containing 93-95% quartz powder, 5 -7% water glass and water). Preheat the mold to 160-260°C and spray paint, the thickness of the paint is 2-5mm, after completion, heat to 220-340°C to eliminate the moisture in the paint.
4）离心浇铸完成后，当其温度低于100℃时取出铸件。4) After the centrifugal casting is completed, take out the casting when its temperature is lower than 100°C.
所述高碳高合金钢的热处理方法依次包括调质处理、固溶强化处理、弥散强化处理。The heat treatment method of the high-carbon high-alloy steel includes quenching and tempering treatment, solid solution strengthening treatment, and dispersion strengthening treatment in sequence.
所述高碳高合金钢的调质处理过程如下：淬火温度920-960℃，保温时间t1=（1.5-2.0）δ+150，油冷至室温，冷速50-80℃／S；回火温度720-760℃，保温时间t2=（1.0-1.5）δ+120，炉冷到500℃后，炉冷或空冷。t1为调质热处理淬火保温时间，min；t2为调质热处理回火保温时间，min；δ为工件厚度，mm。The quenching and tempering process of the high-carbon and high-alloy steel is as follows: quenching temperature 920-960°C, holding time t 1 =(1.5-2.0)δ+150, oil cooling to room temperature, cooling rate 50-80°C/S; Fire temperature is 720-760°C, holding time t 2 =(1.0-1.5)δ+120, after furnace cooling to 500°C, furnace cooling or air cooling. t 1 is the quenching and tempering heat treatment holding time, min; t 2 is the quenching and tempering heat treatment and tempering holding time, min; δ is the workpiece thickness, mm.
所述高碳高合金钢的固溶强化处理过程如下：保温温度960-1020℃，保温时间t3=（1.5-2.0）δ+80，油冷至室温，冷速80-100℃／S。t3为固溶强化保温时间，min；δ为工件厚度，mm。固溶强化处理后硬度为65-67HRC，抗弯强度为950-1100MPa。The solid solution strengthening treatment process of the high-carbon high-alloy steel is as follows: holding temperature 960-1020°C, holding time t 3 =(1.5-2.0)δ+80, oil cooling to room temperature, cooling rate 80-100°C/S. t 3 is the solid solution strengthening holding time, min; δ is the thickness of the workpiece, mm. After solid solution strengthening treatment, the hardness is 65-67HRC, and the bending strength is 950-1100MPa.
所述高碳高合金钢的弥散强化处理过程如下：一次回火温度340-380℃，保温时间t4=（1.0-1.5）δ+50，空冷。t4为一次回火保温时间，min；δ为工件厚度，mm。一次弥散强化处理后硬度为63-65HRC，抗弯强度为1350-1420Mpa。二次回火温度为520-560℃，保温时间t5=（1.0-1.5）δ+50，空冷。t5为二次回火保温时间，min；δ为工件厚度，mm。二次弥散处理后硬度为67-69HRC，抗弯强度为1450-1500Mpa。The dispersion strengthening treatment process of the high-carbon high-alloy steel is as follows: primary tempering temperature 340-380°C, holding time t 4 =(1.0-1.5)δ+50, air cooling. t 4 is the holding time for one tempering, min; δ is the thickness of the workpiece, mm. After a dispersion strengthening treatment, the hardness is 63-65HRC, and the bending strength is 1350-1420Mpa. Secondary tempering temperature is 520-560℃, holding time t 5 =(1.0-1.5)δ+50, air cooling. t 5 is the second tempering holding time, min; δ is the thickness of the workpiece, mm. After secondary dispersion treatment, the hardness is 67-69HRC, and the bending strength is 1450-1500Mpa.
本发明与现有技术相比，具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
1）本发明的高碳高合金钢中以马氏体为基体，含大量碳化物硬质相，硬度高，产品硬度达67-69HRC，具有良好的耐磨性能。1) The high-carbon high-alloy steel of the present invention uses martensite as the matrix, contains a large amount of carbide hard phases, and has high hardness. The product hardness reaches 67-69HRC, and has good wear resistance.
2）本发明中的热处理制度，调质热处理工艺代替一般离心铸造高碳高合金钢热处理过程中的等温退火热处理工艺，大大缩短了热处理周期，提高工作效率。2) In the heat treatment system of the present invention, the quenching and tempering heat treatment process replaces the isothermal annealing heat treatment process in the general centrifugal casting high-carbon high-alloy steel heat treatment process, which greatly shortens the heat treatment cycle and improves work efficiency.
3）本发明中的热处理制度，弥散热处理过程时出现二次硬化现象，硬度提高明显。3) The heat treatment system in the present invention eliminates the secondary hardening phenomenon during the heat treatment process, and the hardness increases significantly.
4）本发明中的热处理制度，碳化物组织分布均匀，大大减小了偏析现象，表面质量好，没有任何裂纹出现。4) In the heat treatment system of the present invention, the carbide structure is evenly distributed, the segregation phenomenon is greatly reduced, the surface quality is good, and no cracks appear.
5）本发明采用离心铸造设备简单，生产成本低廉，热处理在常用电炉中进行，设备通用性强。5) The centrifugal casting equipment adopted in the present invention is simple, the production cost is low, the heat treatment is carried out in a common electric furnace, and the equipment has strong versatility.
具体实施方式Detailed ways
一、高碳高合金钢的制备1. Preparation of high carbon and high alloy steel
实施例1Example 1
采用500公斤容量中频感应炉熔炼，涉及组分按重量配比和具体制备工艺如下：Melting in a 500-kg medium-frequency induction furnace, the proportion of components involved by weight and the specific preparation process are as follows:
将800份无缝钢管轧制用顶头废钢（碳含量为0.15%，铬含量为1.0%，钼含量为0.3%，钨含量为0.6%，镍含量为0.3%），50份市售钨含量为80%的钨铁，55份市售铬含量为70%，碳含量为0.08%的微碳铬铁，55份市售钼含量为65%的钼铁，72份市售钒含量为75%的钒铁为主原料，20份市售石墨为增碳剂，混合加热熔化成钢水。钢水熔清后，加入50份市售硅含量为8%的硅铁进行预脱氧，加入5份铝块进行终脱氧。800 parts of seamless steel pipe rolling head scrap (0.15% carbon content, 1.0% chromium content, 0.3% molybdenum content, 0.6% tungsten content, 0.3% nickel content), 50 parts commercially available tungsten content of 80% ferro-tungsten, 55 parts commercially available chromium content of 70%, carbon content of 0.08% micro-carbon ferrochrome, 55 parts of commercially available ferromolybdenum content of 65% molybdenum, 72 commercially available vanadium content of 75% Ferrovanadium is the main raw material, and 20 parts of commercially available graphite is used as a recarburizer, mixed and heated to melt into molten steel. After the molten steel is melted, 50 parts of commercially available ferrosilicon with a silicon content of 8% is added for pre-deoxidation, and 5 parts of aluminum block is added for final deoxidation.
炉前调整成分合格后升温至1620℃后出炉。加入1份破碎粒度为8-12mm，稀土含量为30%的市售稀土硅铁合金小块，稀土硅铁合金小块经200℃烘干以后置于浇包底部，用包内冲入法对钢水进行变质处理，高碳高合金钢钢水预制工序完成。After adjusting the ingredients before the furnace, the temperature is raised to 1620°C before being released from the furnace. Add 1 portion of commercially available rare earth ferrosilicon alloy pieces with a crushing particle size of 8-12mm and a rare earth content of 30%. The rare earth ferrosilicon alloy pieces are dried at 200°C and placed at the bottom of the ladle, and the molten steel is cleaned by pouring into the ladle. Metamorphic treatment, high-carbon high-alloy steel molten steel prefabrication process is completed.
将预制好的钢水浇入到卧式离心浇铸机内离心浇铸成外径为145mm，内径115mm，厚度为30mm的高碳高合金钢管。离心浇注铸型采用双层金属型，铸型涂料采用水载体涂料，其成分为94%的石英粉、6%水玻璃和水。将铸型预热到180℃时喷涂料，涂料厚度为4mm，完成后，加热到260℃消除涂料中水分。当其温度为90℃时取出高碳高合金钢管铸件，离心浇铸工序完成。The prefabricated molten steel is poured into a horizontal centrifugal casting machine and centrifugally cast into a high-carbon high-alloy steel pipe with an outer diameter of 145mm, an inner diameter of 115mm, and a thickness of 30mm. The centrifugal casting mold adopts a double-layer metal mold, and the mold coating adopts a water-borne coating, and its composition is 94% of quartz powder, 6% of water glass and water. Preheat the mold to 180°C and spray paint, the thickness of the paint is 4mm, after completion, heat to 260°C to eliminate the moisture in the paint. When the temperature is 90°C, the high-carbon and high-alloy steel pipe casting is taken out, and the centrifugal casting process is completed.
其离心铸造高碳高合金钢成分为：C2.15%，W3.95%，Cr3.95%，Mo3.49%，V5.42%，Nb0.15%，Mn0.3%，RE0.25%，Si0.45%，Al0.5%，Ni0.15%，其余为Fe及少量杂质。其硬度为54HRC，抗弯强度为751Mpa。Its centrifugal casting high-carbon high-alloy steel composition is: C2.15%, W3.95%, Cr3.95%, Mo3.49%, V5.42%, Nb0.15%, Mn0.3%, RE0.25% , Si0.45%, Al0.5%, Ni0.15%, the rest is Fe and a small amount of impurities. Its hardness is 54HRC and its bending strength is 751Mpa.
二、高碳高合金钢的热处理方法2. Heat treatment method of high carbon and high alloy steel
实施例2Example 2
截取实施例1制备的高度为50mm的高碳高合金钢管在箱式电阻炉中进行热处理，具体工艺包括调质处理、固溶强化处理、弥散强化处理。The high-carbon high-alloy steel pipe with a height of 50 mm prepared in Example 1 was heat-treated in a box-type resistance furnace, and the specific processes included quenching and tempering treatment, solid solution strengthening treatment, and dispersion strengthening treatment.
调质处理：保温温度为930℃，保温时间为200min，油冷至室温，冷速为60℃／S，回火温度为730℃，保温时间为160min，炉冷至室温，调质热处理工序完成。其硬度为43HRC，抗弯强度为1340Mpa。Quenching and tempering treatment: the holding temperature is 930°C, the holding time is 200min, the oil is cooled to room temperature, the cooling rate is 60°C/S, the tempering temperature is 730°C, the holding time is 160min, the furnace is cooled to room temperature, and the quenching and tempering heat treatment process is completed . Its hardness is 43HRC and its bending strength is 1340Mpa.
固溶强化处理：保温温度为960℃，保温时间为130min，油冷至室温，冷速90℃／S，固溶强化热处理工序完成。其硬度为65HRC，抗弯强度为980Mpa。Solid solution strengthening treatment: the holding temperature is 960°C, the holding time is 130min, the oil is cooled to room temperature, the cooling rate is 90°C/S, and the solid solution strengthening heat treatment process is completed. Its hardness is 65HRC and its bending strength is 980Mpa.
弥散强化处理：一次回火温度为350℃，保温时间为80min，空冷至室温；二次回火温度为530℃，保温时间80min，空冷至室温，弥散强化处理工序完成。一次回火硬度为64HRC，抗弯强度为1390Mpa；二次回火硬度为68HRC，抗弯强度为1460Mpa。Dispersion strengthening treatment: primary tempering temperature is 350°C, holding time is 80min, air cooling to room temperature; secondary tempering temperature is 530°C, holding time is 80min, air cooling to room temperature, the dispersion strengthening treatment process is completed. The primary tempering hardness is 64HRC, and the bending strength is 1390Mpa; the secondary tempering hardness is 68HRC, and the bending strength is 1460Mpa.
实施例3Example 3
截取实施例1制备的高度为75mm的离心铸造高碳高合金钢管在箱式电阻炉中进行热处理，具体工艺包括调质处理、固溶强化处理、弥散强化处理。The centrifugally cast high-carbon high-alloy steel pipe with a height of 75 mm prepared in Example 1 was heat-treated in a box-type resistance furnace, and the specific processes included quenching and tempering treatment, solid solution strengthening treatment, and dispersion strengthening treatment.
调质处理：保温温度为950℃，保温时间为200min，油冷至室温，冷速为60℃／S，回火温度为750℃，保温时间为160min，炉冷至室温，调质热处理工序完成。其硬度为40HRC，抗弯强度为1450Mpa。Quenching and tempering treatment: the holding temperature is 950°C, the holding time is 200min, the oil is cooled to room temperature, the cooling rate is 60°C/S, the tempering temperature is 750°C, the holding time is 160min, the furnace is cooled to room temperature, and the quenching and tempering heat treatment process is completed . Its hardness is 40HRC and its bending strength is 1450Mpa.
固溶强化处理：保温温度为1000℃，保温时间为130min，油冷至室温，冷速90℃／S，固溶强化热处理工序完成。其硬度为67HRC，抗弯强度为1040Mpa。Solid solution strengthening treatment: the holding temperature is 1000°C, the holding time is 130min, the oil is cooled to room temperature, the cooling rate is 90°C/S, and the solid solution strengthening heat treatment process is completed. Its hardness is 67HRC and its bending strength is 1040Mpa.
弥散强化处理：一次回火温度为370℃，保温时间为80min，空冷至室温；二次回火温度为550℃，保温时间80min，空冷至室温，弥散强化处理工序完成。一次回火硬度为65HRC，抗弯强度为1420Mpa；二次回火硬度为69HRC，抗弯强度为1495Mpa。Dispersion strengthening treatment: primary tempering temperature is 370°C, holding time is 80min, air cooling to room temperature; secondary tempering temperature is 550°C, holding time is 80min, air cooling to room temperature, dispersion strengthening treatment process is completed. The primary tempering hardness is 65HRC, and the bending strength is 1420Mpa; the secondary tempering hardness is 69HRC, and the bending strength is 1495Mpa.
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