CN103132087A - Technology for controlling hardness distribution of material for 23CrNi3Mo drill tool - Google Patents

Technology for controlling hardness distribution of material for 23CrNi3Mo drill tool Download PDF

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Publication number
CN103132087A
CN103132087A CN2013100888935A CN201310088893A CN103132087A CN 103132087 A CN103132087 A CN 103132087A CN 2013100888935 A CN2013100888935 A CN 2013100888935A CN 201310088893 A CN201310088893 A CN 201310088893A CN 103132087 A CN103132087 A CN 103132087A
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drilling tool
minutes
furnace
carburizing
drill tool
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CN103132087B (en
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刘雅政
闫永明
周乐育
徐盛
朱洪武
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Beijing University of Technology
University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Abstract

The invention relates to a technology for controlling hardness distribution of a material for a 23CrNi3Mo drill tool. After carburization, mild hardness gradient distribution of the drill tool from surface to center is realized, namely, micro hardness from the surface to the center tissue of the drill tool drops mildly, so that after carburization, the drill tool forms a complex phase tissue which has high surface hardness, high center toughness and a transition layer with certain width, the drill tool is good in toughness and is prolonged in service life. The technology comprises the following steps of quenching the carburized drill tool at 880DEG C+/-10 DEG C; preserving heat for 45 minutes; after thermal insulation, cooling by two sections, wherein the cooling rate is more than or equal to 5 DEG C per second in temperature range of 880-450; cooling to room temperature along with a furnace below 450 DEG C; tempering at 220 DEG C and preserving heat for 120 minutes; and carrying out air cooling to reach room temperature after thermal insulation.

Description

A kind of 23CrNi3Mo drilling tool is controlled technique with the Hardness Distribution of material
Technical field
The present invention relates to specifically a kind of 23CrNi3MoDrilling tool is controlled technique with the Hardness Distribution of material.
Background technology
Drilling tool is requisite instrument in driling explosion, wherein bore bit contacts in the Drilling process and fragmented rock body, bear the tension and compression, bending, the effect of torsion pulsating stress that apply at high frequency, HI high impact merit rock drill, bearing simultaneously huge shock load and the sharp wear of abrasive material.In addition, the bore bit tool also stands corrosion and the abrasive action of the working mediums such as rock, rock dust and mineral water under the envrionment conditions of high speed rotary, collision.Therefore, the service condition of bore bit is very abominable, often only has several minutes or dozens of minutes work-ing life.
The quality and performance of iron and steel facility depends primarily on its weave construction, and reasonably weave construction is the key that obtains the high life drilling tool.Abominable Working environment has proposed higher requirement to the quality of drilling tool: not only require the drilling tool surface to have higher hardness and wear resistance, require simultaneously drilling tool heart section to have higher toughness; And after the drilling tool carburizing by the surface to the Hardness Distribution Determines of the heart section high surface hardness and heart section high tenacity can realize best matching status.
at present, the drilling tool enterprise of domestic majority is in the process of using, after quenching and preserving heat is completed, the general oil quenching that adopts, air cooling, the modes such as isothermal salt bath quenching, these manufactures can't realize that drilling tool is reduced gently by the microhardness of surface to heart section, Hardness Distribution often fast-descending occurs in the excessive position of cementation zone and heart section matrix, thereby can't make the high rigidity on drilling tool surface after carburizing and the high tenacity of heart section obtain best matching transition, usually cause the getting up early of drilling tool to lose efficacy, this is also present domestic lower major cause of drilling tool life-span, and the reasonable control that the drilling tool microhardness gradient is distributed, to improve the steel drilling tool key in work-ing life.
Summary of the invention
The purpose of this invention is to provide a kind of drilling tool microhardness distribution control techniques, the drilling tool that not only makes obtains best structural state (surface: high carbon martensite; Heart section: lower bainite; Middle transition zone: the mixed structure of martensite+lower bainite), and realized by the microhardness mild decline of surface to heart section, thereby really realized high surface hardness and heart section high tenacity optimum matching.
Technical solution of the present invention is: a kind of 23CrNi3MoDrilling tool is controlled technique with the Hardness Distribution of material, specifically comprises the following steps:
The step 1) carburization process: drilling tool adopts hot rolling 23CrNi3Mo rod iron, is placed in the multi-functional cementing furnace of 930 ℃ ± 10 ℃ to carry out carburizing, and permeate agent is kerosene, and cementation process divides two sections to carry out: carburizing 7h when carbon-potential control is 1.2%c; Subsequently carbon potential is adjusted into 1.0% cInsulation 4h; Furnace cooling to 400 ℃ after carburizing is completed, the air cooling of coming out of the stove;
Step 2) with the drilling tool after the above-mentioned steps carburizing is completed at 680 ℃ ± 10 ℃ high temperings, air cooling carries out smart machining by dimensional requirement subsequently;
The step 3) quench treatment: drilling tool after precision work is placed in salt bath furnace, is that 880 ℃ ± 10 times insulations were quenched in 45 minutes in temperature, and insulation is completed, and is cooled to 450 ℃ with the cooling rate of 〉=5 ℃/s, is incubated 5-10 minute, cools to room temperature with the furnace; Then carry out low-temperaturetempering technique: 220 ℃ of tempering temperatures, tempering insulation 120 minutes.
Further, described step 3) quench treatment: drilling tool after precision work is placed under shielding gas, is that 880 ℃ ± 10 times insulations were quenched in 45 minutes in temperature, then is cooled to 450 ℃ with the cooling rate of 〉=5 ℃/s, be incubated 5-10 minute, cool to room temperature with the furnace; Then carry out low-temperaturetempering technique: 220 ℃ of tempering temperatures, tempering insulation 120 minutes; Wherein, described shielding gas comprises nitrogen, argon gas or helium.
 
Beneficial effect of the present invention is: owing to adopting technique scheme, after the present invention can realize carburizing, drilling tool mild hardness gradient from outward appearance to inner essence distributes, namely present mild decline by the surperficial microhardness to core structure of drilling tool, make drilling tool after carburizing form the heterogeneous structure of high surface hardness, heart section's high tenacity and certain width transition layer, obtain drilling tool obdurability matched well, thereby effectively raise the work-ing life of drilling tool.All iron and steel facility that belong to surface cementation in order to realize the gently dipping distribution of microhardness, make high surface hardness and heart section high tenacity obtain the optimum matching state, all can be with reference to step quenching techniques provided by the present invention, so use range is wider.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is described further.
Embodiment 1
Adopt hot rolling 23CrNi3Mo rod iron (chemical composition is C:0.22-0.24%, Si:0.20-0.30%, Mn:0.65-0.75%, Cr 1.25-1.35%, Ni 2.89-2.98%, Mo 0.23-0.28%, P≤0.015%, S≤0.008%) to carry out thick machining, proceed as follows after thick machining is completed:
1, be placed in the multi-functional cementing furnace of 930 ℃ and carry out carburizing, permeate agent is kerosene, and cementation process divides two sections to carry out: carburizing 7h when carbon-potential control is 1.2%c; Subsequently carbon potential is adjusted into 1.0%c insulation 4 h; Furnace cooling to 400 ℃ after carburizing is completed, the air cooling of coming out of the stove;
2, with the drilling tool after the above-mentioned steps carburizing is completed at 680 ℃ of high temperings, air cooling carries out smart machining by dimensional requirement subsequently;
3, quench treatment: drilling tool after precision work is placed in salt bath furnace, then quenching temperature is 880 ℃ of insulations 45 minutes, insulation is completed, and is cooled to 450 ℃ with the cooling rate of 〉=5 ℃/s, is incubated 5 minutes, cools to room temperature with the furnace; Then carry out low-temperaturetempering technique: 220 ℃ of tempering temperatures, tempering insulation 120 minutes.Drilling tool case depth 1.3 mm that produce by the way, the surface cementation layer is the high carbon martensite tissue, carburized layer hardness reaches HRC58 ~ 62; Zone of transition is the heterogeneous structure of martensite+lower bainite, about width of transition zone 0.8 mm; Matrix is the lower bainite tissue, about hardness HRC40; Be not only drilling tool and possessed outer strong interior tough performance, simultaneously by the hardness slow decreasing of surface to heart section, make high strength and high tenacity obtain best matching status.
Embodiment 2
Adopt hot rolling 23CrNi3Mo rod iron (chemical composition is C:0.22-0.24%, Si:0.20-0.30%, Mn:0.65-0.75%, Cr 1.25-1.35%, Ni 2.89-2.98%, Mo 0.23-0.28%, P≤0.015%, S≤0.008%) to carry out thick machining, proceed as follows after thick machining is completed:
1, be placed in the multi-functional cementing furnace of 920 ℃ and carry out carburizing, permeate agent is kerosene, and cementation process divides two sections to carry out: carburizing 7h when carbon-potential control is 1.2%c; Subsequently carbon potential is adjusted into 1.0%c insulation 4h; Furnace cooling to 400 ℃ after carburizing is completed, the air cooling of coming out of the stove;
2, with the drilling tool after the above-mentioned steps carburizing is completed at 690 ℃ of high temperings, air cooling carries out smart machining by dimensional requirement subsequently;
3, quench treatment: drilling tool after precision work is placed in salt bath furnace, is 870 ℃ of insulations 45 minutes in quenching temperature, and insulation is completed, then is cooled to 450 ℃ with the cooling rate of 〉=5 ℃/s, is incubated 7.5 minutes, cools to room temperature with the furnace; Then carry out low-temperaturetempering technique: 220 ℃ of tempering temperatures, tempering insulation 120 minutes.
Embodiment 3
Adopt hot rolling 23CrNi3Mo rod iron (chemical composition is C:0.22-0.24%, Si:0.20-0.30%, Mn:0.65-0.75%, Cr 1.25-1.35%, Ni 2.89-2.98%, Mo 0.23-0.28%, P≤0.015%, S≤0.008%) to carry out thick machining, proceed as follows after thick machining is completed:
1, be placed in the multi-functional cementing furnace of 940 ℃ and carry out carburizing, permeate agent is kerosene, and cementation process divides two sections to carry out: carburizing 7h when carbon-potential control is 1.2%c; Subsequently carbon potential is adjusted into 1.0%c insulation 4h; Furnace cooling to 400 ℃ after carburizing is completed, the air cooling of coming out of the stove;
2, with the drilling tool after the above-mentioned steps carburizing is completed at 670 ℃ of high temperings, air cooling carries out smart machining by dimensional requirement subsequently;
3, quench treatment: drilling tool after precision work is placed under the protective atmosphere of nitrogen, then temperature is that 890 ℃ of insulations were quenched in 45 minutes, insulation is completed, and is cooled to 450 ℃ with the cooling rate of 〉=5 ℃/s, is incubated 10 minutes, cools to room temperature with the furnace; Then carry out low-temperaturetempering technique: 220 ℃ of tempering temperatures, tempering insulation 120 minutes.

Claims (2)

1. one kind 23CrNi3MoDrilling tool is controlled technique with the Hardness Distribution of material, it is characterized in that, specifically comprises the following steps:
The step 1) carburization process: drilling tool adopts hot rolling 23CrNi3Mo rod iron, is placed in the multi-functional cementing furnace of 930 ℃ ± 10 ℃ to carry out carburizing, and permeate agent is kerosene, and cementation process divides two sections to carry out: carburizing 7h when carbon-potential control is 1.2%c; Subsequently carbon potential is adjusted into 1.0% cInsulation 4h; Furnace cooling to 400 ℃ after carburizing is completed, the air cooling of coming out of the stove;
Step 2) with the drilling tool after the above-mentioned steps carburizing is completed at 680 ℃ ± 10 ℃ high temperings, air cooling carries out smart machining by dimensional requirement subsequently;
The step 3) quench treatment: drilling tool after precision work is placed in salt bath furnace, is that 880 ℃ ± 10 times insulations were quenched in 45 minutes in temperature, and insulation is completed, and is cooled to 450 ℃ with the cooling rate of 〉=5 ℃/s, is incubated 5-10 minute, cools to room temperature with the furnace; Then carry out low-temperaturetempering technique: 220 ℃ of tempering temperatures, tempering insulation 120 minutes.
2. control technique according to claim 1, it is characterized in that, described step 3) quench treatment: drilling tool after precision work is placed under shielding gas, be that 880 ℃ ± 10 times insulations were quenched in 45 minutes in temperature, cooling rate with 〉=5 ℃/s is cooled to 450 ℃ again, be incubated 5-10 minute, cool to room temperature with the furnace; Then carry out low-temperaturetempering technique: 220 ℃ of tempering temperatures, tempering insulation 120 minutes; Wherein, described shielding gas comprises nitrogen, argon gas or helium.
CN201310088893.5A 2013-03-20 2013-03-20 Technology for controlling hardness distribution of material for 23CrNi3Mo drill tool Expired - Fee Related CN103132087B (en)

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Cited By (13)

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Publication number Priority date Publication date Assignee Title
CN103305668A (en) * 2013-06-18 2013-09-18 宜昌市五环钻机具有限责任公司 Thermal treatment method of 23CrNi3Mo and application of 23CrNi3Mo in drilling tool
CN103352110A (en) * 2013-06-19 2013-10-16 长沙天和钻具机械有限公司 Processing technology of medium-wind-pressure percussion bit
CN104726819A (en) * 2015-03-20 2015-06-24 上海人本集团有限公司 Heat treatment carburization process of carburizing steel
CN105695679A (en) * 2016-04-06 2016-06-22 北京科技大学 Isothermal quenching process for drill tool steel XGQ25 with high-tenacity complex phase structure distribution
CN105821371A (en) * 2016-04-06 2016-08-03 北京科技大学 Heat treatment process of brazing tool steel XGQ25 with gradient hardness distribution
CN106521402A (en) * 2016-11-29 2017-03-22 金川集团股份有限公司 Whole heat treatment method for 23CrNi3MoA hollow steel rock drill rod
CN107805776A (en) * 2017-10-23 2018-03-16 金川集团股份有限公司 A kind of carburizing carbon potential DISTRIBUTION CONTROL PROCESS of 23CrNi3MoA drilling tools material
CN110129526A (en) * 2019-05-29 2019-08-16 河南四方达超硬材料股份有限公司 A kind of preparation method of high wind pressure diamond down-the-hold drill bit steel body and drill bit using the steel body
CN110565046A (en) * 2019-09-25 2019-12-13 贵州捷盛钻具股份有限公司 heat treatment method for rock drilling rod
CN110592341A (en) * 2019-10-31 2019-12-20 成都先进金属材料产业技术研究院有限公司 Annealing softening heat treatment method for rock drilling tool steel
CN111961974A (en) * 2020-08-20 2020-11-20 本钢板材股份有限公司 Preparation method of drill rod tail shaft of tapping machine
CN113462859A (en) * 2021-06-24 2021-10-01 重庆欣天利智能重工有限公司 Heat treatment process for nitrate of drill rod
WO2022083248A1 (en) * 2020-10-22 2022-04-28 长沙黑金刚实业有限公司 Carburized workpiece and preparation method therefor

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103305668B (en) * 2013-06-18 2015-03-25 宜昌市五环钻机具有限责任公司 Thermal treatment method of 23CrNi3Mo and application of 23CrNi3Mo in drilling tool
CN103305668A (en) * 2013-06-18 2013-09-18 宜昌市五环钻机具有限责任公司 Thermal treatment method of 23CrNi3Mo and application of 23CrNi3Mo in drilling tool
CN103352110A (en) * 2013-06-19 2013-10-16 长沙天和钻具机械有限公司 Processing technology of medium-wind-pressure percussion bit
CN103352110B (en) * 2013-06-19 2014-08-27 长沙天和钻具机械有限公司 Processing technology of medium-wind-pressure percussion bit
CN104726819A (en) * 2015-03-20 2015-06-24 上海人本集团有限公司 Heat treatment carburization process of carburizing steel
CN104726819B (en) * 2015-03-20 2017-09-19 上海人本集团有限公司 Carburizing Heat-Treatment of Steel carburization process
CN105821371B (en) * 2016-04-06 2018-09-14 北京科技大学 A kind of heat treatment process of the rock-drill steel XGQ25 with hardness gradient distribution
CN105695679A (en) * 2016-04-06 2016-06-22 北京科技大学 Isothermal quenching process for drill tool steel XGQ25 with high-tenacity complex phase structure distribution
CN105821371A (en) * 2016-04-06 2016-08-03 北京科技大学 Heat treatment process of brazing tool steel XGQ25 with gradient hardness distribution
CN106521402A (en) * 2016-11-29 2017-03-22 金川集团股份有限公司 Whole heat treatment method for 23CrNi3MoA hollow steel rock drill rod
CN107805776A (en) * 2017-10-23 2018-03-16 金川集团股份有限公司 A kind of carburizing carbon potential DISTRIBUTION CONTROL PROCESS of 23CrNi3MoA drilling tools material
CN110129526A (en) * 2019-05-29 2019-08-16 河南四方达超硬材料股份有限公司 A kind of preparation method of high wind pressure diamond down-the-hold drill bit steel body and drill bit using the steel body
CN110565046A (en) * 2019-09-25 2019-12-13 贵州捷盛钻具股份有限公司 heat treatment method for rock drilling rod
CN110592341A (en) * 2019-10-31 2019-12-20 成都先进金属材料产业技术研究院有限公司 Annealing softening heat treatment method for rock drilling tool steel
CN111961974A (en) * 2020-08-20 2020-11-20 本钢板材股份有限公司 Preparation method of drill rod tail shaft of tapping machine
CN111961974B (en) * 2020-08-20 2021-07-09 本钢板材股份有限公司 Preparation method of drill rod tail shaft of tapping machine
WO2022083248A1 (en) * 2020-10-22 2022-04-28 长沙黑金刚实业有限公司 Carburized workpiece and preparation method therefor
CN113462859A (en) * 2021-06-24 2021-10-01 重庆欣天利智能重工有限公司 Heat treatment process for nitrate of drill rod

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