CN104404390A - High-strength and high-plasticity bolting steel for supporting in coal mines and manufacturing method thereof - Google Patents
High-strength and high-plasticity bolting steel for supporting in coal mines and manufacturing method thereof Download PDFInfo
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- CN104404390A CN104404390A CN201410742623.6A CN201410742623A CN104404390A CN 104404390 A CN104404390 A CN 104404390A CN 201410742623 A CN201410742623 A CN 201410742623A CN 104404390 A CN104404390 A CN 104404390A
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Abstract
The invention relates to a high-strength and high-plasticity bolting steel for supporting in coal mines and a manufacturing method thereof, and belongs to the technical field of alloy steel. The bolting steel comprises the following chemical components by weight percent: 0.15-0.35wt% of C, 0.60-1.20wt% of Si, 2.00-2.50wt% of Mn, 0.30-0.80wt% of Cr, 0.40-0.80wt% of Ni, 0.30-0.60wt% of Mo, 0.0008-0.002wt% of B, 0-0.010wt% of S, 0-0.020wt% of P and the balance of Fe and unavoidable impurities. The manufacturing method comprises the following steps: converter or electric furnace smelting, external refining, square billet continuous casting, heating, bar and wire rolling mill rolling, and air-cooling to the room temperature. According to the compounds and technology, a bainite-martensite-retained austenite duplex structure can be obtained through rolled products, the yield strength of the material is greater than 1000 MPa, the tensile strength of the material is greater than 1300 MPa, and the elongation rate of the material is greater than 15%. The bolting steel is low in product cost and good in comprehensive performance without heat treatment.
Description
Technical field
The invention belongs to technical field of alloy steel, particularly a kind of coal mine support high strength, high-ductility rock bolt steel and manufacture method thereof and manufacture method.
Background technology
Along with the continuous increase of coal mining depth, roadway support is more and more difficult, and the raising of mine machinery recovery percent causes drift section constantly to expand, in the urgent need to can have the novel anchor rod steel of high strength and high-ductility simultaneously.What China generally adopted at present is diameter is the hot-rolled low-alloy high-strength deformed steel bar anchor pole of 18 ~ 22mm, yield strength is generally lower than 600MPa, more than the thermal treatment process of many employings quenching+tempering of 700MPa, energy consumption is large, production cost is high, comprehensive mechanical property is poor and be difficult to obtain high strength and high-ductility, the development of serious restriction China anchor pole material.
Summary of the invention
The object of the present invention is to provide a kind of coal mine support high strength, high-ductility rock bolt steel and manufacture method, solve existing As rolled rock bolt steel low strength and heat treatment state rock bolt steel cost, shortcoming that energy consumption is high, this steel grade production efficiency is high, production cost is low, production technique is simple, and comprehensive mechanical property is good.
The chemical constitution of this rock bolt steel by weight percentage composition (wt.%) is: C:0.15-0.35; Si:0.60-1.20; Mn:2.00-2.50; Cr:0.30-0.80; Ni:0.40-0.80; Mo:0.30-0.60; B:0.0008-0.002; S≤0.010; P≤0.020; Surplus is Fe and inevitable impurity.
The manufacturing process of rock bolt steel of the present invention is followed successively by: converter or electrosmelting, external refining, billet continuous casting, heating, bar wire rod rolling mill rolling, cooling; The technical parameter controlled in process is: Heating temperature 1000-1300 DEG C, start rolling temperature 950-1250 DEG C, finishing temperature 700-900 DEG C, rolls rear air cooling.The stocking of this rock bolt steel can obtain bainite-martensite-residual austenite heterogeneous structure, and the yield strength of material is greater than 1000MPa, and tensile strength is greater than 1300MPa, and unit elongation is greater than 15%.
The effect of each element of the present invention and proportioning are according to as follows:
Carbon: for this rock bolt steel, first carbon is the intensity improving steel, is secondly be enriched in residual austenite, increases residual austenite quantity, improves its stability.During carbon element content height, the carbon content in retained austenite is also high, reduces Ms point, improves stability.But the too high plasticity of steel and the toughness of making of carbon element content significantly reduces, and carbon element content is too low, makes the stability of retained austenite greatly reduce, so that does not have phase change induction plasticity phenomenon.It is 0.15-0.35wt.% that the present invention controls carbon content.
Silicon: be mainly present in this rock bolt steel in solid solution mode, in bainite forming process, impel carbon to be diffused in austenite, suppress the formation of carbide, not only play solution strengthening, also impel carbon enrichment in austenite, improve the stability of residual austenite.It is 0.60-1.20% that the present invention controls silicon content.
Manganese: rise in steel and improve hardening capacity and solution strengthening effect, improves and does not change stabilization of austenite, contribute to obtaining more residual austenite, but when Fe content is too high, and its segregation tendency in strand increases, and steel over-all properties reduces.It is 2.00-2.50% that the present invention controls manganese content.
Chromium: the hardening capacity (having the effect reducing A3 temperature and improve supercooled austenite stability concurrently) significantly improving steel, makes the decline of Ms point improve stability of retained austenite.Chromium easily forms dense oxidation film and significantly improves solidity to corrosion.It is 0.30-0.80% that the present invention controls chrome content.
Nickel: improve the intensity of steel and significantly do not reduce its toughness, significantly improve the hardening capacity of steel by improving austenitic thermodynamic stability and obtain more residual austenite.Nickel can reduce the brittle transition temperature of steel, can improve the low-temperature flexibility of steel, improves processibility and the weldability of steel.Nickel can also improve the resistance to corrosion of steel.It is 0.40-0.80% that the present invention controls nickel content.
Molybdenum: the strong hardening capacity improving steel, strong postponement pearlitic transformation, postpone less to bainitic transformation, improve the temperature of the maximum phase velocity of perlite simultaneously, reduce the temperature of the maximum phase velocity of bainite, there are two C curves of perlitic transformation and bainite transformation significantly, thus can obtain bainite structure when continuous coo1ing.It is 0.30-0.60% that the present invention controls containing molybdenum amount.
Boron: the hardening capacity significantly improving steel, the B of trace can make bainite transformation C curve move to right, and makes steel can obtain bainite structure within the scope of wider cooling rate.Boron contents of the present invention is for being 0.0005-0.002%.
Phosphorus, sulphur enter in this low-carbon (LC) silicomanganese cat head steel as impurity element, and content controls respectively at S≤0.010%, P≤0.020%.
According to the continuous cooling curve of described steel chemical composition determination steel grade, in conjunction with the air cooling cooling rate of the regular size determination stocking that rock bolt steel is produced, make stocking in process air cooler, obtain bainite-martensite-residual austenite heterogeneous structure.Confirm through test, this rock bolt steel As rolled object performance: yield strength is greater than 1000MPa, and tensile strength is greater than 1300MPa, and unit elongation is greater than 15%.And roll rear employing air cooling, do not need thermal treatment just to have good comprehensive mechanical property.
The invention has the advantages that: the rock bolt steel obtained by this invention, yield strength and the more existing As rolled rock bolt steel of tensile strength significantly improve, and plasticity and toughness keep higher level, can meet onsite application; And relative to heat treatment state rock bolt steel, technique is simple, production cost is low, and energy consumption is low.
Embodiment
Embodiment 1: the chemical constitution of rock bolt steel of the present invention by weight percentage composition (wt.%) is C:0.24; Si:0.79; Mn:2.02; Cr:0.46; Ni:0.48; Mo:0.39, B:0.001; S:0.006, P:0.008, surplus is Fe and inevitable impurity.Manufacturing process: converter smelting, LF refining, billet continuous casting, the heating of 1250 DEG C, process furnace, bar wire rod rolling mill rolling, start rolling temperature 1100 DEG C, finishing temperature 880 DEG C, rolling specs Φ 20mm, rolls rear air cooling.
Embodiment 2: chemical constitution of the present invention by weight percentage composition is C:0.16; Si:1.10; Mn:2.40; Cr:0.48; Ni:0.60; Mo:0.40, B:0.0015; S:0.008, P:0.01, surplus is Fe and inevitable impurity.Manufacturing process: converter smelting, LF refining, billet continuous casting, the heating of 1250 DEG C, process furnace, bar wire rod rolling mill rolling, start rolling temperature 1100 DEG C, finishing temperature 850 DEG C, rolling specs Φ 20mm, rolls rear air cooling.
Embodiment 3: chemical constitution of the present invention by weight percentage composition is C:0.25; Si:0.80; Mn:2.1; Cr:0.38; Ni:0.50; Mo:0.32, B:0.0010; S:0.003, P:0.008, surplus is Fe and inevitable impurity.Manufacturing process: converter smelting, LF refining, billet continuous casting, the heating of 1250 DEG C, process furnace, bar wire rod rolling mill rolling, start rolling temperature 1100 DEG C, finishing temperature 850 DEG C, rolling specs Φ 20mm, rolls rear air cooling.
Embodiment mechanics properties testing result is as shown in table 1.
Table 1 embodiment mechanics properties testing result
Claims (2)
1. coal mine support high strength, a high-ductility rock bolt steel, is characterized in that, chemical composition is by weight percentage: C:0.15-0.35; Si:0.60-1.20; Mn:2.00-2.50; Cr:0.30-0.80; Ni:0.40-0.80; Mo:0.30-0.60; B:0.0008-0.002; S≤0.010; P≤0.020; Surplus is Fe and inevitable impurity.
2. a manufacture method for rock bolt steel according to claim 1, technique is followed successively by: converter or electrosmelting, external refining, billet continuous casting, heating, bar wire rod rolling mill rolling, cooling; The technical parameter controlled in process is: Heating temperature 1000-1300 DEG C, start rolling temperature 950-1250 DEG C, finishing temperature 700-900 DEG C, rolls rear air cooling;
Obtain bainite-martensite-residual austenite heterogeneous structure after rolling, the yield strength of material is greater than 1000MPa, and tensile strength is greater than 1300MPa, and unit elongation is greater than 15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410742623.6A CN104404390A (en) | 2014-12-08 | 2014-12-08 | High-strength and high-plasticity bolting steel for supporting in coal mines and manufacturing method thereof |
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| CN201410742623.6A CN104404390A (en) | 2014-12-08 | 2014-12-08 | High-strength and high-plasticity bolting steel for supporting in coal mines and manufacturing method thereof |
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| CN104404390A true CN104404390A (en) | 2015-03-11 |
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| CN201410742623.6A Pending CN104404390A (en) | 2014-12-08 | 2014-12-08 | High-strength and high-plasticity bolting steel for supporting in coal mines and manufacturing method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385308A (en) * | 2017-06-28 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | The cooling controlling and rolling controlling process of railway high-strength wearable shellfish horse heterogeneous structure rail |
| CN108754305A (en) * | 2018-05-23 | 2018-11-06 | 何满潮 | NPR is nonmagnetic anchor pole Steel material and its production method |
| WO2019222943A1 (en) * | 2018-05-23 | 2019-11-28 | He Manchao | Npr nonmagnetic anchor rod steel material and production method therefor |
| CN111593270A (en) * | 2019-12-16 | 2020-08-28 | 北京特冶工贸有限责任公司 | 1280 MPa-grade martensite multiphase bainite steel rail for general line and manufacturing method thereof |
| WO2021038404A1 (en) * | 2019-08-23 | 2021-03-04 | Rand York Castings (Pty) Limited | Rock bolt assembly |
| CN113637916A (en) * | 2021-08-19 | 2021-11-12 | 山西通才工贸有限公司 | Ultrahigh-strength hot-rolled anchor rod steel bar and production method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0978193A (en) * | 1995-09-13 | 1997-03-25 | Nippon Steel Corp | High strength pc steel bar excellent in delayed fracture characteristic and its production |
| CN1477226A (en) * | 2003-08-01 | 2004-02-25 | 清华大学 | Medium-low carbon manganese system self-hardening bainite steel |
| JP2005139517A (en) * | 2003-11-07 | 2005-06-02 | Jfe Steel Kk | Method for producing high strength and high toughness thick steel plate |
| CN102534432A (en) * | 2012-01-10 | 2012-07-04 | 清华大学 | Method for manufacturing and tempering bainite wear-resistant steel and steel pipe |
| JP2013117068A (en) * | 2011-11-01 | 2013-06-13 | Jfe Steel Corp | High-strength hot-rolled steel sheet having excellent bending characteristic and low-temperature toughness and method for producing the same |
-
2014
- 2014-12-08 CN CN201410742623.6A patent/CN104404390A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0978193A (en) * | 1995-09-13 | 1997-03-25 | Nippon Steel Corp | High strength pc steel bar excellent in delayed fracture characteristic and its production |
| CN1477226A (en) * | 2003-08-01 | 2004-02-25 | 清华大学 | Medium-low carbon manganese system self-hardening bainite steel |
| JP2005139517A (en) * | 2003-11-07 | 2005-06-02 | Jfe Steel Kk | Method for producing high strength and high toughness thick steel plate |
| JP2013117068A (en) * | 2011-11-01 | 2013-06-13 | Jfe Steel Corp | High-strength hot-rolled steel sheet having excellent bending characteristic and low-temperature toughness and method for producing the same |
| CN102534432A (en) * | 2012-01-10 | 2012-07-04 | 清华大学 | Method for manufacturing and tempering bainite wear-resistant steel and steel pipe |
Non-Patent Citations (2)
| Title |
|---|
| 干勇等: "《钢铁材料手册下》", 31 July 2009, 化学工业出版社 * |
| 王廷溥等: "《金属塑性加工学-轧制理论与工艺》", 30 June 2012, 冶金工业出版社 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385308A (en) * | 2017-06-28 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | The cooling controlling and rolling controlling process of railway high-strength wearable shellfish horse heterogeneous structure rail |
| CN108754305A (en) * | 2018-05-23 | 2018-11-06 | 何满潮 | NPR is nonmagnetic anchor pole Steel material and its production method |
| CN108754305B (en) * | 2018-05-23 | 2019-04-23 | 何满潮 | NPR is nonmagnetic anchor pole Steel material and its production method |
| WO2019222943A1 (en) * | 2018-05-23 | 2019-11-28 | He Manchao | Npr nonmagnetic anchor rod steel material and production method therefor |
| US11434558B2 (en) | 2018-05-23 | 2022-09-06 | Manchao He | NPR non-magnetic steel material for rock bolt and production method thereof |
| WO2021038404A1 (en) * | 2019-08-23 | 2021-03-04 | Rand York Castings (Pty) Limited | Rock bolt assembly |
| CN111593270A (en) * | 2019-12-16 | 2020-08-28 | 北京特冶工贸有限责任公司 | 1280 MPa-grade martensite multiphase bainite steel rail for general line and manufacturing method thereof |
| CN113637916A (en) * | 2021-08-19 | 2021-11-12 | 山西通才工贸有限公司 | Ultrahigh-strength hot-rolled anchor rod steel bar and production method thereof |
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Application publication date: 20150311 |