CN103572175A - Bainitic steel and thermal treatment method for bainitic steel products - Google Patents
Bainitic steel and thermal treatment method for bainitic steel products Download PDFInfo
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Abstract
The invention discloses bainitic steel, which comprises the following ingredients in percentage by weight: less than or equal to 0.35% of C, less than or equal to 1.8% of Si, less than or equal to 1.85% of Mn, less than or equal to 1.1% and more than or equal to 2% of Cr, less than or equal to 2% and more than or equal to 3.2% of Ni, less than or equal to 0.55% of Mo, less than or equal to 0.005% of S, less than or equal to 0.02% of P, less than or equal to 0.25% of Cu, less than or equal to 0.1% of V, and the balance of Fe. The invention further discloses a preparation method for bainitic steel products. The preparation method comprises the following steps: step 1, weighing the ingredients, and performing electroslag remelting to obtain a steel ingot; step 2, casting the steel ingot; step 3, machining the steel ingot rollers with finished specifications according to size required by a drawing; step 4, performing thermal treatment on the rollers with the finished specifications, thus obtaining the bainitic steel. Through the material, the roller has ultrahigh strength while obtaining good ductility and toughness.
Description
Technical field
The invention belongs to material technology field, 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 of realizing drilling automation, and iron driller roller is the key component of iron driller, determining 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 processing 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, solved the problem that the iron driller roller material that exists in prior art and processing method are difficult to meet its requirement.
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 that a kind of bainitic steel, is comprised 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.
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, according to following composition, according to Wt%, weigh: 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 is forged to casting;
Step 3, size is processed as steel ingot on the roller of trimmed size by drawing;
Step 4, to the thermal treatment again of the roller of trimmed size, adopt special atmosphere oven heating, the after-blow nitrogen protection of coming out of the stove is cooled to room temperature.
The invention has the beneficial effects as follows, application and thermal treatment process thereof by bainitic steel on roller are studied, make roller have superstrength when obtaining good plasticity and toughness, met the service requirements of iron driller roller product, concrete advantage and beneficial effect comprise:
1) when best thermal treatment process makes new steel grade obtain good plasticity and toughness, there is superstrength.Reached the design requirements of roller product.2), without carrying out complicated thermal treatment, be characterized in that nitrogen flushing protection is cooled to room temperature after protective atmosphere heating, then through low-temperaturetempering to room temperature, can obtain the comprehensive mechanical property of superstrength and good plasticity and toughness.3) profiling equivalence coupon Φ 165 * 250mm is carried out to mechanical property test, 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 comprised 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 again solution strengthening.Therefore, when the alloy designs of bainitic steel, manage carbon content to be controlled at the higher level of low carbon range, can obtain the double effects of strengthening and malleableize simultaneously.Silicon can be dissolved in ferrite and austenite, improves hardness and the intensity of steel, and aspect the toughness plasticity of raising bainitic steel, the most effective approach is by adding element silicon, to suppress consumingly the formation of carbide at present.Once there be Carbide Precipitation in ferrite lath,, with the reduction of transformation temperature, the shock absorption of bainitic steel can all can reduce with relative reduction in area.Manganese and iron form sosoloid, improve ferrite and austenitic hardness and intensity in steel, and the ability of manganese stable austenite tissue is only second to nickel, and increases the hardening capacity of steel; Nickel, when improving the intensity of steel, also has some improvement to the plasticity of steel and toughness, moreover, and to compare containing 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 improve 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, the operations such as final thermal treatment.
Adopt bainitic steel of the present invention, be applied on oil iron driller roller, the preparation process of finished product (roller) is to implement according to following steps:
Step 1, according to following composition, according to Wt%, weigh: 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, will steel ingot forge after 960 ± 10 ℃ of insulations 3 hours, stove is chilled to 350 ± 10 ℃ of following air coolings to room temperature; Then again at 680 ± 10 ℃, be incubated 5 hours, then air cooling is to room temperature, to avoid causing hydrogen-induced defect and to reduce hardness, is convenient to machining;
Step 3, size is processed as steel ingot the product (oil iron driller roller) of trimmed size by drawing;
Step 4, the roller thermal treatment to trimmed size; the heating of employing special atmosphere oven; heat treatment process parameter is: 3 hours nitrogen blowing of 940 ± 10 ℃ of insulations are cooled to room temperature; then again at 300 ± 10 ℃, be incubated 5 hours air coolings to room temperature; the after-blow nitrogen protection of coming out of the stove is cooled to room temperature; prevent roller surface oxidation.
Embodiment
One, smelting technology: electrosmelting+esr
As follows by the chemical composition of steel according to the oil iron driller roller 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: the Φ 165 * 250mm profiling equivalence coupon that is swaged into furnace charge with roller and heat-treats with stove is heat-treated to test, and heat treating regime testing program is two:
1,940 ℃ of insulations of scheme nitrogen flushing in 3 hours protection is cooled to room temperature, and 5 hours air coolings of 200 ℃ of insulations are to room temperature;
2,940 ℃ of insulations of scheme nitrogen flushing in 3 hours protection is cooled to room temperature, and 5 hours air coolings of 300 ℃ of insulations 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, has obtained superstrength (tensile strength > 1700Mpa) and good plasticity and toughness, and its homogeneous microstructure is tiny.To profiling equivalence coupon, mechanical property test is carried out in sampling, and result shows, its every mechanical property meets the requirement of steel for roller.
Claims (4)
1. a bainitic steel, its feature is: following composition, according to Wt%, consist 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, surplus is Fe.
2. a preparation method for bainitic steel goods claimed in claim 1, its feature is, according to following steps, implements:
Step 1, according to following composition, according to Wt%, weigh: 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 is forged to casting;
Step 3, size is processed as steel ingot in the goods of trimmed size by drawing;
Step 4, to the thermal treatment again of the roller of trimmed size, adopt special atmosphere oven heating, the after-blow nitrogen protection of coming out of the stove is cooled to room temperature.
3. the preparation method of bainitic steel goods according to claim 2, its feature is: in described step 2, heat treatment process parameter is: after will steel ingot forging, 960 ± 10 ℃ of insulations 3 hours, stove was chilled to 350 ± 10 ℃ of following air coolings to room temperature; Then again at 680 ± 10 ℃, be incubated 5 hours, then air cooling is to room temperature.
4. the preparation method of bainitic steel goods according to claim 2, its feature is: in described step 4, heat treatment process parameter is: 3 hours nitrogen blowing of 940 ± 10 ℃ of insulations are cooled to room temperature, then again at 300 ± 10 ℃, are incubated 5 hours air coolings to room temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| 上海机床厂磨床研究所冷碎车间编辑: "热处理工艺手册", 《热处理工艺手册》, 31 December 1974 (1974-12-31), pages 325 - 326 * |
| 朱建军等: "一种铁钻工滚轮用贝氏体钢的试验研究", 《石油机械》, vol. 39, no. 10, 31 October 2011 (2011-10-31), pages 16 - 18 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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