CN103572175B - A kind of bainitic steel and goods heat treating method thereof - Google Patents
A kind of bainitic steel and goods heat treating method thereof Download PDFInfo
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- CN103572175B CN103572175B CN201310512001.XA CN201310512001A CN103572175B CN 103572175 B CN103572175 B CN 103572175B CN 201310512001 A CN201310512001 A CN 201310512001A CN 103572175 B CN103572175 B CN 103572175B
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Abstract
The invention discloses a kind of bainitic steel, be made up of: C≤0.35, Si≤1.8, Mn≤1.85,1.1≤Cr≤2,2≤Ni≤3.2, Mo≤0.55, S≤0.005, P≤0.02, Cu≤0.25, V≤0.1 following composition according to Wt%, surplus is Fe.The invention also discloses the preparation method of this kind of bainitic steel goods, implement according to following steps: step 1, weighing said components, adopt esr to obtain steel ingot; Step 2, steel ingot carried out forging casting; Steel ingot is processed as the roller of trimmed size by step 3, by drawing size; Step 4, roller thermal treatment again to trimmed size.Material of the present invention makes roller have superstrength while obtaining good plasticity and toughness.
Description
Technical field
The invention belongs to field of material technology, relate to a kind of bainitic steel, the invention still further relates to the preparation method of this kind of bainitic steel goods.
Background technology
Iron driller is the visual plant realizing drilling automation, and iron driller roller is the key component of iron driller, decide the total quality of iron driller the work-ing life of iron driller roller, because the service condition of iron driller roller is harsh, its material and mechanical property requirements are extremely special, adopt existing material and progress method to be difficult to meet its requirement.
Summary of the invention
The object of this invention is to provide a kind of bainitic steel, solve the iron driller roller material that exists in prior art and processing method is difficult to meet its problem required.
Another object of the present invention is to provide the preparation method of this kind of bainitic steel goods.
The technical solution adopted in the present invention is, a kind of bainitic steel, is made up of: C≤0.35, Si≤1.8, Mn≤1.85 following composition according to Wt%, 1.1≤Cr≤2,2≤Ni≤3.2, Mo≤0.55, S≤0.005, P≤0.02, Cu≤0.25, V≤0.1, surplus is Fe.
Another technical scheme of the present invention is, a kind of preparation method of above-mentioned bainitic steel goods, implements according to following steps:
Step 1, to weigh according to Wt% according to following composition: C≤0.35, Si≤1.8, Mn≤1.85,1.1≤Cr≤2,2≤Ni≤3.2, Mo≤0.55, S≤0.005, P≤0.02, Cu≤0.25, V≤0.1, surplus is Fe, adopts esr to obtain steel ingot;
Step 2, steel ingot carried out forging casting;
Steel ingot is processed as the roller of trimmed size by step 3, by drawing size;
Step 4, roller thermal treatment again to trimmed size, adopt special atmosphere oven heating, after-blow nitrogen protection of coming out of the stove is cooled to room temperature.
The invention has the beneficial effects as follows, by the application of bainitic steel on roller and thermal treatment process research thereof, make roller have superstrength while obtaining good plasticity and toughness, meet the service requirements of iron driller roller product, concrete advantage and beneficial effect comprise:
1) while best thermal treatment process makes new steel grade obtain good plasticity and toughness, there is superstrength.Reach the design requirements of roller product.2) without the need to carrying out complicated thermal treatment, being characterized in that nitrogen flushing protection is cooled to room temperature after protective atmosphere heating, then the comprehensive mechanical property of superstrength and good plasticity and toughness can being obtained to room temperature through low-temperaturetempering.3) carry out mechanical property test to profiling equivalence coupon Φ 165 × 250mm, test-results shows that its performance index are higher than roller performance requriements.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
Bainitic steel of the present invention, for the preparation of oil iron driller roller, is made up of according to Wt% following composition: C≤0.35, Si≤1.8, Mn≤1.85,1.1≤Cr≤2,2≤Ni≤3.2, Mo≤0.55, S≤0.005, P≤0.02, Cu≤0.25, V≤0.1, surplus is Fe.
The carbon content of steel remains on middle low levels can thinning microstructure, is conducive to solution strengthening again.Therefore, when the alloy designs of bainitic steel, manage carbon content to be controlled the higher level at low carbon range, the double effects of strengthening and malleableize can be obtained simultaneously.Silicon can be dissolved in ferrite and austenite, improves hardness and the intensity of steel, and in the toughness plasticity improving bainitic steel, the most effective approach suppresses the formation of carbide consumingly at present.Once have Carbide Precipitation in ferrite lath, then with the reduction of transformation temperature, the shock absorption of bainitic steel all can be able to reduce with relative reduction in area.Manganese and iron form sosoloid, and improve ferrite and austenitic hardness and intensity in steel, the ability of manganese stable austenite tissue is only second to nickel, and increases the hardening capacity of steel; Nickel, while the intensity improving steel, also has some improvement to the plasticity of steel and toughness, moreover with compared with manganese alloy, why nickelalloy organizes obvious refinement, and basic reason is the little and membranaceous A of original austenite grain size
rcarbon content is high, be evenly distributed, and this is conducive to significantly improving A
rstability and the toughness plasticity of steel.Secondly, the carbon enrichment of separating out from BF is at A
rin, make it steady in a long-term at ambient temperature.
The present invention adopts electroslag remelting steel ingot, for finished product roller material treating processes, then through forging, annealing+high tempering, machining, and the operations such as finished heat treatment.
Adopt bainitic steel of the present invention, be applied on oil iron driller roller, the preparation process of finished product (roller) implements according to following steps:
Step 1, to weigh according to Wt% according to following composition: C≤0.35, Si≤1.8, Mn≤1.85,1.1≤Cr≤2,2≤Ni≤3.2, Mo≤0.55, S≤0.005, P≤0.02, Cu≤0.25, V≤0.1, surplus is Fe, adopts esr to obtain steel ingot;
Step 2, by steel ingot forge after 960 ± 10 DEG C insulation 3 hours, stove is chilled to less than 350 ± 10 DEG C air coolings to room temperature; Then again 680 ± 10 DEG C of insulations 5 hours, then air cooling is to room temperature, is convenient to machining to avoid causing hydrogen-induced defect and reducing hardness;
Steel ingot is processed as the product (oil iron driller roller) of trimmed size by step 3, by drawing size;
Step 4, roller thermal treatment to trimmed size; employing special atmosphere oven heats; heat treatment process parameter is: 940 ± 10 DEG C of insulations, 3 hours nitrogen blowing are cooled to room temperature; then again 5 hours air coolings are incubated to room temperature at 300 ± 10 DEG C; after-blow nitrogen protection of coming out of the stove is cooled to room temperature; roller surface is prevented to be oxidized.
Embodiment
One, smelting technology: electrosmelting+esr
As follows according to the chemical composition of the oil iron driller roller steel of above-mentioned explained hereafter:
Heat (batch) number 201009120C0.28, Si1.68, Mn1.83, Cr1.48, Ni2.15, Mo0.35, S0.001, P0.018, Cu0.09, V0.05;
Heat (batch) number 201010115C0.28, Si1.67, Mn1.8, Cr1.47, Ni2.26, Mo0.34, S0.002, P0.019, Cu0.08, V0.06.
Two, heat treating regime and mechanical property, microstructure: to be swaged into furnace charge with roller and to heat-treat test with Φ 165 × 250mm profiling equivalence coupon that stove is heat-treated, heat treating regime testing program is two:
Scheme 1,940 DEG C insulation nitrogen flushing in 3 hours protection is cooled to room temperature, and 200 DEG C of insulations, 5 hours air coolings are to room temperature;
Scheme 2,940 DEG C insulation nitrogen flushing in 3 hours protection is cooled to room temperature, and 300 DEG C of insulations, 5 hours air coolings are to room temperature;
The mechanical property test Data Comparison of table 1 sample
Mechanicl test result shows, mechanical property all meets the requirement of roller product.Finally determine that optimum treatment process is " scheme 2 ".By microscopic test, equivalent coupon microstructure is after heat treatment granular bainite, homogeneous microstructure, and grain fineness number rating result is 8 grades.
Bainitic steel of the present invention is applied on oil iron driller roller, and obtain superstrength (tensile strength > 1700Mpa) and good plasticity and toughness, its homogeneous microstructure is tiny.Carry out mechanical property test to the sampling of profiling equivalence coupon, result shows, its every mechanical property meets the requirement of roller steel.
Claims (1)
1. a preparation method for bainitic steel goods, is characterized in that, implements according to following steps:
Step 1, to weigh according to Wt% according to following composition: C≤0.35, Si≤1.8, Mn≤1.85,1.1≤Cr≤2,2≤Ni≤3.2, Mo≤0.55, S≤0.005, P≤0.02, Cu≤0.25, V≤0.1, surplus is Fe, adopts esr to obtain steel ingot;
Step 2, steel ingot carried out forging casting;
Heat treatment process parameter is: 960 ± 10 DEG C of insulations 3 hours after being forged by steel ingot, stove is chilled to less than 350 ± 10 DEG C air coolings to room temperature; Then again 680 ± 10 DEG C of insulations 5 hours, then air cooling is to room temperature;
Steel ingot is processed as the goods of trimmed size by step 3, by drawing size;
Step 4, roller thermal treatment again to trimmed size, adopt special atmosphere oven heating, after-blow nitrogen protection of coming out of the stove is cooled to room temperature,
Heat treatment process parameter is: 940 ± 10 DEG C of insulations, 3 hours nitrogen blowing are cooled to room temperature, are then again incubated 5 hours air coolings to room temperature at 300 ± 10 DEG C.
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| CN201310512001.XA CN103572175B (en) | 2013-10-25 | 2013-10-25 | A kind of bainitic steel and goods heat treating method thereof |
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| CN103572175B true CN103572175B (en) | 2016-03-02 |
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| CN104313449A (en) * | 2014-09-29 | 2015-01-28 | 中原特钢股份有限公司 | Production method of low-temperature high-strength high-toughness steel for lifting rings |
Citations (5)
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|---|---|---|---|---|
| US6254696B1 (en) * | 1998-01-14 | 2001-07-03 | Nippon Steel Corporation | Bainitic type rail excellent in surface fatigue damage resistance and wear resistance |
| CA2343847A1 (en) * | 2000-04-14 | 2001-10-14 | Petr Cerny | Joint of a turnout segment of manganese steel with a rail of carbon steel |
| CN101654728A (en) * | 2009-09-25 | 2010-02-24 | 清华大学 | Method for preparing manganese chilled bainitic steel |
| CN102560261A (en) * | 2012-03-23 | 2012-07-11 | 三一重型装备有限公司 | Bainitic steel and preparation method thereof |
| CN102732807A (en) * | 2012-06-28 | 2012-10-17 | 宝鸡石油机械有限责任公司 | Bainitic steel for petroleum drilling elevator, and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6254696B1 (en) * | 1998-01-14 | 2001-07-03 | Nippon Steel Corporation | Bainitic type rail excellent in surface fatigue damage resistance and wear resistance |
| CA2343847A1 (en) * | 2000-04-14 | 2001-10-14 | Petr Cerny | Joint of a turnout segment of manganese steel with a rail of carbon steel |
| CN101654728A (en) * | 2009-09-25 | 2010-02-24 | 清华大学 | Method for preparing manganese chilled bainitic steel |
| CN102560261A (en) * | 2012-03-23 | 2012-07-11 | 三一重型装备有限公司 | Bainitic steel and preparation method thereof |
| CN102732807A (en) * | 2012-06-28 | 2012-10-17 | 宝鸡石油机械有限责任公司 | Bainitic steel for petroleum drilling elevator, and preparation method thereof |
Non-Patent Citations (2)
| Title |
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| 一种铁钻工滚轮用贝氏体钢的试验研究;朱建军等;《石油机械》;20111031;第39卷(第10期);第16-18页 * |
| 热处理工艺手册;上海机床厂磨床研究所冷碎车间编辑;《热处理工艺手册》;上海机床厂磨床研究所冷碎车间;19741231;第325-326页 * |
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