CN101623718A - Method for manufacturing hollow steel with lined pipe by machine drilling and hot rolling - Google Patents
Method for manufacturing hollow steel with lined pipe by machine drilling and hot rolling Download PDFInfo
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- CN101623718A CN101623718A CN200910102705A CN200910102705A CN101623718A CN 101623718 A CN101623718 A CN 101623718A CN 200910102705 A CN200910102705 A CN 200910102705A CN 200910102705 A CN200910102705 A CN 200910102705A CN 101623718 A CN101623718 A CN 101623718A
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Abstract
The invention discloses a method for manufacturing hollow steel with a lined pipe by machine drilling and hot rolling, belonging to the production method of the hollow steel in steel drilling industry. The invention aims to provide a production method of hollow steel with a lined pipe, which has a matrix with hardly unlimited size and stable quality. The method comprises steps of manufacturing the matrix, machine-drilling a through hole, inserting a mandril, carrying out hot rolling and drawing out the mandril, wherein one steel pipe is inserted into the through hole after the machine drilling, and the mandril is inserted in the steel pipe. The invention has the advantages of compact matrix texture, good product performance, stable quality, and the like, thereby being an ideal method for manufacturing hollow steel with a line pipe, which is used for rock-drilling rods, in particular small-dimension rock-drilling rods.
Description
Technical field:
The present invention relates to the production method of a kind of drill rod, relate in particular to a kind of production method with the internal lining pipe cored steel with cored steel; The cored steel production method that belongs to the steel industry.
Background technology:
As everyone knows, drill rod mainly has or not internal lining pipe cored steel and band internal lining pipe cored steel two big classes with cored steel.The main at present hollow ingot casting hot rolling method that adopts is produced band internal lining pipe cored steel, and it is generally used for making the cored steel of small dimension (≤R32, H32, particularly H22); This method is before molten steel casting the steel pipe of another kind of material to be fixed on the central authorities of watering mold, and molten steel casting forms the hollow steel ingot of band internal lining pipe, and the austenitic steel plug is inserted in the cooling back, heating rolling becomes the cored bar cored steel, and the cooling back is extracted plug out.Mainly there is following defective in hollow ingot casting hot rolling method:
1) if adopt low carbon steel pipe, can form the low carbon-coating (, being exactly decarburized layer) of one deck at the bore area of finished product cored steel on the one hand with respect to the matrix of cored steel, this is the major incentive that causes the early fatigue crackle;
2) if adopt alloy pipe, then can the invar pipe very approaching with the fusing point of steel billet, increased the difficulty of controlling pouring temperature;
3) because ingot shape is elongated, the gas in the molten steel, field trash etc. are difficult to effectively come-up eliminating, and the material degree of purity of steel ingot is difficult to guarantee;
4) macrostructure of steel ingot is relatively poor;
5) cross sectional dimensions of steel ingot is restricted that (general opposite side≤150mm), the compression ratio of steel rolling is restricted.
Summary of the invention:
At the above-mentioned defective that exists in the prior art, the present invention aims to provide a kind of method of machine drilling and hot rolling manufactured band internal lining pipe cored steel; The band internal lining pipe cored steel that utilizes this method to produce, restricted hardly, the steady quality of its matrix size.
To achieve these goals, the present invention by the following technical solutions: it comprises matrix making, power auger through hole, inserts plug, hot rolling, extraction plug; Insert a steel pipe after the power auger through hole earlier, and then plug is inserted in this steel pipe.
The external diameter of described steel pipe is less than through-hole diameter 0.1～2.0mm, and the internal diameter of steel pipe is greater than described diameter of mandrel 0.2～2.0mm.
Described matrix is steel ingot or the continuous casting steel billet that direct pouring forms; Described matrix also can be the shaped steel through rolling or forging.
Compared with the prior art, the present invention is owing to adopted technique scheme, with in the present cored steel production technology the machine drilling and hot rolling method of comparative maturity, hollow ingot casting hot rolling method organically combine, therefore thoroughly overcome the inherent shortcoming that hollow ingot casting hot rolling method exists.The matrix of the band internal lining pipe cored steel of producing with the inventive method has more performance than the matrix of the band internal lining pipe cored steel that adopts hollow ingot casting hot rolling method to produce, but the expansion time of delay fatigue crackle; The inwall of the band internal lining pipe cored steel of producing with the inventive method has more performance than the inwall of the no internal lining pipe cored steel that other methods such as adopting the machine drilling and hot rolling method is produced, but the formation time of delay fatigue crackle, small dimension drill rod (≤R32, H32 that the band internal lining pipe cored steel of producing with the inventive method is made, H22 particularly) under equal conditions, can improve 30%～100% tired service life.
The inventive method has that the matrix size is unrestricted, the degree of purity of matrix steel is higher, macrostructure matrix steel is better, and the cored steel performance is better, quality is more stable, and steel pipe is to the reinforcement of inner hole wall and anticorrosive advantage such as make good use of.Make a concrete analysis of as follows:
1) because matrix is solid before boring, therefore can adopts various steel-making, roll the degree of purity that (forging) steel means improve matrix steel, the macrostructure of matrix steel is better;
2) because matrix can adopt the shaped steel through rolling or forging, therefore compression ratio rolling or forging can be bigger, thereby make that organizing of matrix is fine and close more;
3) since endoporus by machine drilling method realization, so the size of matrix cross sections can select greatlyyer, the tissue looseness in matrix centre also can be drilled be fallen;
4) because mode and the matrix of steel pipe by hot rolling carries out compound, therefore the production method of matrix can have more selection, thereby can overcome effectively that the band internal lining pipe cored steel matrix purity that adopts hollow ingot casting hot rolling method to produce is low, tissue looseness, macrostructure are poor, easily contain many defectives such as sand holes, pore, shrinkage cavity;
5) because the material of steel pipe can have multiple choices, therefore if select suitable high strength alloy steel, then steel pipe has good inner-wall reinforced effect; If select suitable martensitic stain less steel, then steel pipe has better inner-wall reinforced and anticorrosive effect.
The specific embodiment:
The invention will be further described below in conjunction with specific embodiment, and detailed process is as follows:
1) by the known conventional method for making steel matrix is cast into the steel ingot or the continuous casting steel billet of square, hexagon, bar shape such as cylindrical, or by the known conventional method that matrix is rolling or be forged into the shaped steel of bar shape such as cylindrical, square;
2) according to the concrete specification of cored steel with select the size of matrix for use, by known mechanical deep hole drilling method at the matrix centre drill or bore through hole;
3) steel pipe of external diameter less than described through-hole diameter 0.1～2.0mm inserted in this through hole according to a conventional method;
4) be that the plug of austenitic steel inserts in the steel pipe according to a conventional method with diameter less than described pipe diameter 0.2～2.0mm, material;
5) hot rolling according to a conventional method, the cooling back is extracted described plug out, must be with the internal lining pipe cored steel;
6) finishing according to a conventional method, alignment.
Claims (4)
1. the method for a machine drilling and hot rolling manufactured band internal lining pipe cored steel comprises matrix making, power auger through hole, inserts plug, hot rolling, extraction plug; It is characterized in that: insert a steel pipe after the power auger through hole earlier, and then plug is inserted in this steel pipe.
2. the method for machine drilling and hot rolling manufactured band internal lining pipe cored steel according to claim 1 is characterized in that: the external diameter of described steel pipe is less than through-hole diameter 0.1～2.0mm, and the internal diameter of steel pipe is greater than described diameter of mandrel 0.2～2.0mm.
3. the method for machine drilling and hot rolling manufactured band internal lining pipe cored steel according to claim 1 and 2 is characterized in that: described matrix is steel ingot or the continuous casting steel billet that direct pouring forms.
4. the method for machine drilling and hot rolling manufactured band internal lining pipe cored steel according to claim 1 and 2 is characterized in that: described matrix is the shaped steel through rolling or forging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910102705A CN101623718A (en) | 2009-07-28 | 2009-07-28 | Method for manufacturing hollow steel with lined pipe by machine drilling and hot rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910102705A CN101623718A (en) | 2009-07-28 | 2009-07-28 | Method for manufacturing hollow steel with lined pipe by machine drilling and hot rolling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101623718A true CN101623718A (en) | 2010-01-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910102705A Pending CN101623718A (en) | 2009-07-28 | 2009-07-28 | Method for manufacturing hollow steel with lined pipe by machine drilling and hot rolling |
Country Status (1)
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| CN (1) | CN101623718A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430574A (en) * | 2011-10-28 | 2012-05-02 | 首钢贵阳特殊钢有限责任公司 | Rolling technology for hollow steel for drill tools |
| CN110026734A (en) * | 2018-01-11 | 2019-07-19 | 关维良 | A kind of production technology of direct boring method cored steel |
| CN112959414A (en) * | 2021-02-03 | 2021-06-15 | 林岩 | PVC pipeline perforating device |
-
2009
- 2009-07-28 CN CN200910102705A patent/CN101623718A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430574A (en) * | 2011-10-28 | 2012-05-02 | 首钢贵阳特殊钢有限责任公司 | Rolling technology for hollow steel for drill tools |
| CN102430574B (en) * | 2011-10-28 | 2014-02-05 | 首钢贵阳特殊钢有限责任公司 | Rolling technology for hollow steel for drill tools |
| CN110026734A (en) * | 2018-01-11 | 2019-07-19 | 关维良 | A kind of production technology of direct boring method cored steel |
| CN110026734B (en) * | 2018-01-11 | 2021-01-01 | 关维良 | Production process of hollow steel by direct drilling method |
| CN112959414A (en) * | 2021-02-03 | 2021-06-15 | 林岩 | PVC pipeline perforating device |
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Open date: 20100113 |