CN102278541A - Bimetallic composite pipe and preparation method - Google Patents
Bimetallic composite pipe and preparation method Download PDFInfo
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- CN102278541A CN102278541A CN2011101988804A CN201110198880A CN102278541A CN 102278541 A CN102278541 A CN 102278541A CN 2011101988804 A CN2011101988804 A CN 2011101988804A CN 201110198880 A CN201110198880 A CN 201110198880A CN 102278541 A CN102278541 A CN 102278541A
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Abstract
The invention discloses a bimetallic composite pipe. An outer pipe and an inner pipe are connected by cold drawing. A phosphorization layer and/or a saponification and phosphorization layer are/is arranged between the outer pipe and the inner pipe. A preparation method of the bimetallic composite pipe comprises the following steps of: 1) respectively performing cold drawing on the outer pipe and the inner pipe after surface treatment, wherein the clearance between the inner wall of the outer pipe and the outer wall of the inner pipe is 2 to 5 millimeters; 2) performing alignment and surface treatment on the inner pipe and the outer pipe respectively; and 3) performing composite cold drawing on the outer pipe and the inner pipe after sleeving so that the outer pipe is tightly combined with the inner pipe, and thus obtaining the bimetallic composite pipe. Because a cold drawing machining composite mode is adopted in the pipes of different materials, the strength and the abrasion resistance of the bimetallic composite pipe are improved by over 4 to 5 times compared with a 16Mn steel pipe of single material on the premise of ensuring good toughness and impact resistance of a product.
Description
Technical field
The present invention relates to composite pipe, particularly a kind of composite bimetal pipe.
Background technique
In industries such as electric power, mine, metallurgy, the conveying of material, all be usually adopt closely, high pressure pipe line carries, because transported substance makes pipeline bear sizable pressure in the pipeline fluid movement, and standing very serious wearing and tearing, the pipeline of single material is difficult to satisfy the requirement of this operating mode.And generally adopt the 16Mn seamless steel pipe at present both at home and abroad, and cause inner-walls of duct heavy wear, change frequent.Difficulty of processing increases to adopt middle and high carbon alloy steel to substitute then, and a little less than the impact resistance.
Summary of the invention
Technical problem to be solved by this invention provides a kind of composite bimetal pipe, when having high strength and wear resistance, also has good toughness and shock resistance.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of composite bimetal pipe connects by cold-drawn between outer tube and the interior pipe.
Be provided with phosphating coating and/or saponification phosphating coating between described outer tube and the interior pipe.
Described outer tube is carbon content≤0.2% or alloying element total amount less than 3.5% low alloy steel.
Pipe is the structural carbon steel of the Alloy Constructional Steel of carbon content 〉=0.45% or carbon content 〉=0.6% in described.
A kind of preparation method of composite bimetal pipe may further comprise the steps:
1) outer tube and interior tube-surface are handled back cold-drawn respectively, and the gap of outer tube wall and outer wall of inner tube is 2-5mm;
2) internal respectively pipe and outer tube carry out alignment and carry out surface treatment, and described surface treatment is pickling, cleaning neutralization, phosphatization and saponification;
3) outer tube and interior pipe box close the compound cold-drawn in back, and outer tube and interior pipe are combined closely;
Obtain composite bimetal pipe by above-mentioned steps.
In step 3), the control wall thickness reducing amount is 6%-24% of a wall thickness during compound cold-drawn.
Optimize, in step 3), the control wall thickness reducing amount is 10%-20% of a wall thickness during compound cold-drawn.
Further optimize, in step 3), the control wall thickness reducing amount is 10%-15% of a wall thickness during compound cold-drawn.
After the compound cold-drawn, the inwall of interior pipe (2) also carries out mid frequency induction hardening.
A kind of composite bimetal pipe provided by the invention and preparation method adopt the compound mode of cold-drawn processing by the tubing with unlike material.Under the prerequisite of guaranteeing toughness that product is good and impact resistance, the single than before material 16Mn steel pipe in intensity and wear resistance aspect has improved more than 4-5 times, and this product organically combines the excellent properties of unlike material steel pipe, has high cost performance, prolong steel pipe working life greatly, economic benefit is obvious, and market prospects are wide.
The present invention adopts enough magnitude of interference that interior pipe and outer tube are formed and closely cooperates, and between interior pipe and outer tube, be provided with phosphating coating and/or saponification phosphating coating, particularly the saponification phosphating coating is except having the surface anticorrosive function, also has lubricating function, like this in drawing process, this lubricating function is in the operating mode that big material deformation is arranged, wall thickness reducing amount described in embodiments of the invention reach wall thickness 6%-24% the time, also can effectively avoid tubing to be pulled, thereby interior pipe and outer tube are closely linked by interference fit.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is a processing schematic representation of the present invention.
Embodiment
In Fig. 1, a kind of composite bimetal pipe connects by cold-drawn between outer tube 1 and the interior pipe 2.
Be provided with phosphating coating and/or saponification phosphating coating between described outer tube 1 and the interior pipe 2.
Described outer tube 1 is carbon content≤0.2% or alloying element total amount less than 3.5% low alloy steel.
Pipe 2 is the Alloy Constructional Steel of carbon content 〉=0.45% or the structural carbon steel of carbon content 〉=0.6% in described.Structural carbon steel is the carbon constructional quality steel that is commonly called as.
A kind of preparation method of composite bimetal pipe may further comprise the steps:
1) cold-drawn respectively after outer tube 1 and 2 surface treatments of interior pipe, the gap of outer tube 1 inwall and interior pipe 2 outer walls is 2-5mm;
2) internal respectively pipe and outer tube carry out alignment and carry out surface treatment, and described surface treatment is pickling, cleaning neutralization, phosphatization and saponification;
3) compound cold-drawn behind outer tube 1 and interior pipe 2 fits is combined closely outer tube 1 and interior pipe 2;
Obtain composite bimetal pipe by above-mentioned steps.
In step 3), the control wall thickness reducing amount is 6%-24% of a wall thickness during compound cold-drawn.
Optimize, in step 3), the control wall thickness reducing amount is 10%-20% of a wall thickness during compound cold-drawn.
Further optimize, in step 3), the control wall thickness reducing amount is 10%-15% of a wall thickness during compound cold-drawn.
Pickling is cleaned the oxide layer of steel tube surface for adopting sulfuric acid HSO4, nitric acid HN3O or the hydrochloric acid HCL of 15% ± 5% mass concentration.
Clean neutralization for adopting in the alkaline solution flushing and the steel tube surface acid solution.
Phosphatization generally adopts Zinc phosphate, manganese salt to adhere to phosphating coat.The purpose of phosphatization mainly is to provide lubricated adhesive layer to steel pipe, prevents that to a certain extent metal is corroded.
Saponification is to adopt sodium stearate that phosphating coat is handled.The saponification phosphating coat that obtains has good lubricity, can well keep continuity in distortion, the coefficient of reducing friction.Usually adopt steel pipe 60-85 ℃ of 15min in the sodium stearate solution of 100g/l, 110 ℃ of dry 30min.
After the compound cold-drawn, the inwall of interior pipe 2 also carries out mid frequency induction hardening.
Embodiment:
1, specifications of raw materials 20# Φ 140 * 4 * 5200mm, at first carry out surface treatment (pickling-cleaning neutralization-phosphatization-saponification), but then the cold hobbing cold-drawn by interior outer mold to obtain Dimensions be that the accurate pipe of Φ 135 * 2.5 * 8200mm is as outer tube 1.
2, specifications of raw materials 45Mn2 Φ 127 * 4 * 6000mm, through after the surface treatment and cold-drawn can to get Dimensions be that the precision pipe of Φ 127 * 2.5 * 8200mm is as interior pipe 2.
3, internally pipe and outer tube carry out alignment and carry out surface treatment respectively;
4, pipe in the 45Mn2 after the alignment is placed in the outer pipe orifice of 20# and alignment, pipe and outer tube unite two into one in carrying out after the compound cold-drawn simultaneously, the no gap of combining closely is of a size of φ 133 * 4.5 * 8200mm after cold-drawn is compound, and length dimension is for removing the size behind the chuck of finished product two ends.Wall thickness reducing amount is 0.5mm in this example, and through test, the difference according to diameter of steel tube is controlled at 0.3-1.2mm with wall thickness reducing amount, is equivalent to 6%-24% of wall thickness, all is feasible.Be lower than this numerical value then in the pipe and outer tube between in conjunction with defective tightness, then cost performance is not high to be higher than this numerical value, and the distortion bigger.
5, the concrete technical order of the compound back of precision finished product is as follows:
Dimensional accuracy: IT10-IT12
Straightness accuracy: 0.3-1.0mm/1000mm
Inner and outer surface roughness Ra0.8-3.2
6, further optimized project is that the finished product endoporus carries out mid frequency induction hardening.
Outer surface matrix hardness HB160-200, tensile strength sigma b: 〉=410MPa, yield strength σ s: 〉=245MPa, specific elongation δ 5(%): 〉=25, reduction of cross sectional area ψ (%): 〉=55, internal surface matrix hardness HRC55-62., tensile strength sigma b: 〉=2000 Mpa.
Claims (9)
1. a composite bimetal pipe is characterized in that: connect by cold-drawn between outer tube (1) and the interior pipe (2).
2. a kind of composite bimetal pipe according to claim 1 is characterized in that: be provided with phosphating coating and/or saponification phosphating coating between described outer tube (1) and the interior pipe (2).
3. a kind of composite bimetal pipe according to claim 1 is characterized in that: described outer tube (1) for carbon content≤0.2% or alloying element total amount less than 3.5% low alloy steel.
4. a kind of composite bimetal pipe according to claim 1 is characterized in that: pipe (2) is the structural carbon steel of the Alloy Constructional Steel of carbon content 〉=0.45% or carbon content 〉=0.6% in described.
5. the preparation method of a composite bimetal pipe is characterized in that may further comprise the steps:
1) cold-drawn respectively after outer tube (1) and interior pipe (2) surface treatment, the gap of outer tube (1) inwall and interior pipe (2) outer wall is 2-5mm;
2) internal respectively pipe and outer tube carry out alignment and carry out surface treatment, and described surface treatment is pickling, cleaning neutralization, phosphatization and saponification;
3) compound cold-drawn behind outer tube (1) and interior pipe (2) fit is combined closely outer tube (1) and interior pipe (2);
Obtain composite bimetal pipe by above-mentioned steps.
6. the preparation method of a kind of composite bimetal pipe according to claim 5 is characterized in that: in step 3), the control wall thickness reducing amount is 6%-24% of a wall thickness during compound cold-drawn.
7. the preparation method of a kind of composite bimetal pipe according to claim 5 is characterized in that: in step 3), the control wall thickness reducing amount is 10%-20% of a wall thickness during compound cold-drawn.
8. the preparation method of a kind of composite bimetal pipe according to claim 5 is characterized in that: in step 3), the control wall thickness reducing amount is 10%-15% of a wall thickness during compound cold-drawn.
9. the preparation method of a kind of composite bimetal pipe according to claim 5, it is characterized in that: after the compound cold-drawn, the inwall of interior pipe (2) also carries out mid frequency induction hardening.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101988804A CN102278541A (en) | 2011-07-15 | 2011-07-15 | Bimetallic composite pipe and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101988804A CN102278541A (en) | 2011-07-15 | 2011-07-15 | Bimetallic composite pipe and preparation method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103173771A (en) * | 2013-03-15 | 2013-06-26 | 宜昌中南精密钢管有限公司 | Method for improving impact performance of steel material |
| CN103861887A (en) * | 2014-03-20 | 2014-06-18 | 北京科技大学 | Preparation method of high-performance copper/titanium bimetal capillary tube |
| CN104033665A (en) * | 2014-06-05 | 2014-09-10 | 陕西太合科技有限公司 | Mining high-intensity non-magnetic metal composite pipe and preparation method thereof |
| WO2017177544A1 (en) * | 2016-04-13 | 2017-10-19 | 王云孝 | Grid-lined, pre-dimpled, double-layer, mechanically lined pipe, and lining pipe thereof |
| CN110158103A (en) * | 2018-02-14 | 2019-08-23 | 宣城市金泓钢管科技有限公司 | A kind of acid cleaning of steel tube production line |
| CN112090983A (en) * | 2020-09-04 | 2020-12-18 | 宜昌中南精密钢管有限公司 | Method for increasing adhesion of lining bimetal composite pipe |
| CN113414364A (en) * | 2021-06-21 | 2021-09-21 | 山西昌达盛精密铸造有限公司 | Solid-state double-metal inner wall wear-resistant material conveying circular pipe and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290579A (en) * | 2000-11-07 | 2001-04-11 | 杨宝森 | Method for producing multiple metal composite pipe |
| CN1346718A (en) * | 2001-10-22 | 2002-05-01 | 亓登利 | Process for preparing seamless composite metal pipe |
| CN1372093A (en) * | 2002-03-13 | 2002-10-02 | 尹申泉 | Technology for making stainless steel pipe by cold drawing |
| CN101372020A (en) * | 2008-10-06 | 2009-02-25 | 江苏银环精密钢管股份有限公司 | Method for preparing U-shaped seamless steel pipe of high-pressure feedwater heater |
| CN202176830U (en) * | 2011-07-15 | 2012-03-28 | 宜昌中南精密钢管有限公司 | Thermometal composite tube |
-
2011
- 2011-07-15 CN CN2011101988804A patent/CN102278541A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290579A (en) * | 2000-11-07 | 2001-04-11 | 杨宝森 | Method for producing multiple metal composite pipe |
| CN1346718A (en) * | 2001-10-22 | 2002-05-01 | 亓登利 | Process for preparing seamless composite metal pipe |
| CN1372093A (en) * | 2002-03-13 | 2002-10-02 | 尹申泉 | Technology for making stainless steel pipe by cold drawing |
| CN101372020A (en) * | 2008-10-06 | 2009-02-25 | 江苏银环精密钢管股份有限公司 | Method for preparing U-shaped seamless steel pipe of high-pressure feedwater heater |
| CN202176830U (en) * | 2011-07-15 | 2012-03-28 | 宜昌中南精密钢管有限公司 | Thermometal composite tube |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103173771A (en) * | 2013-03-15 | 2013-06-26 | 宜昌中南精密钢管有限公司 | Method for improving impact performance of steel material |
| CN103173771B (en) * | 2013-03-15 | 2015-12-23 | 宜昌中南精密钢管有限公司 | A kind of method improving steel impact property |
| CN103861887A (en) * | 2014-03-20 | 2014-06-18 | 北京科技大学 | Preparation method of high-performance copper/titanium bimetal capillary tube |
| CN104033665A (en) * | 2014-06-05 | 2014-09-10 | 陕西太合科技有限公司 | Mining high-intensity non-magnetic metal composite pipe and preparation method thereof |
| CN104033665B (en) * | 2014-06-05 | 2018-10-30 | 陕西太合科技有限公司 | A kind of mining high-strength non-magnetic metal composite pipe and preparation method thereof |
| WO2017177544A1 (en) * | 2016-04-13 | 2017-10-19 | 王云孝 | Grid-lined, pre-dimpled, double-layer, mechanically lined pipe, and lining pipe thereof |
| CN110158103A (en) * | 2018-02-14 | 2019-08-23 | 宣城市金泓钢管科技有限公司 | A kind of acid cleaning of steel tube production line |
| CN112090983A (en) * | 2020-09-04 | 2020-12-18 | 宜昌中南精密钢管有限公司 | Method for increasing adhesion of lining bimetal composite pipe |
| CN113414364A (en) * | 2021-06-21 | 2021-09-21 | 山西昌达盛精密铸造有限公司 | Solid-state double-metal inner wall wear-resistant material conveying circular pipe and preparation method thereof |
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Application publication date: 20111214 |