CN202176830U - Thermometal composite tube - Google Patents
Thermometal composite tube Download PDFInfo
- Publication number
- CN202176830U CN202176830U CN2011202507559U CN201120250755U CN202176830U CN 202176830 U CN202176830 U CN 202176830U CN 2011202507559 U CN2011202507559 U CN 2011202507559U CN 201120250755 U CN201120250755 U CN 201120250755U CN 202176830 U CN202176830 U CN 202176830U
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- tube
- outer tube
- cold
- pipe
- inner tube
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Abstract
Provided is a thermometal composite tube, an outer tube is in cold-drawing connection with an inner tube. A phosphate coating and/or a saponification phosphate coating are arranged between the outer tube and the inner tube. A preparation method of the thermometal composite tube comprises the following steps: 1) cold-drawing is carried out on surfaces of the outer tube and the inner tube respectively after surface treatment of the outer tube and the inner tube, a gap between the inner wall of the outer tube and the outer wall of the inner tube ranges from 2mm to 5mm; 2) the outer tube and the inner tube are respectively straightened and surface treatment is conducted; and 3) composite cold-drawing is carried out after the inner tube is sleeved in the outer tube , and the outer tube is closely combined with the inner tube. The thermometal composite tube can be obtained through the steps. Tubes made of different materials adopt a cold-drawing producing composite mode, on the premise of guaranteeing good toughness and impact resistance of products and compared with prior single-material 16Mn steel tubes, strength and abrasive resistance improve by 4-5 times.
Description
Technical field
The utility model 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
The utility model technical problem to be solved provides a kind of composite bimetal pipe, when having high tenacity and wear resistance, also has good toughness and shock resistance.
For solving the problems of the technologies described above, the technological scheme that the utility model adopted is: a kind of composite bimetal pipe connects through 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 through 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 and preparation method that the utility model provides are through the compound mode of pipe material by adopting cold-drawn processing 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, prolongs steel pipe working life greatly; Economic benefit is obvious, and market prospects are wide.
The utility model 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 also has lubricating function except having the surface anticorrosive 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 the embodiment of the utility model reach wall thickness 6%-24% the time, also can effectively avoid tubing to be pulled, thus make in the pipe and outer tube be closely linked through interference fit.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is described further:
Fig. 1 is the processing schematic representation of the utility model.
Embodiment
In Fig. 1, a kind of composite bimetal pipe connects through 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 interior pipe 2 surface treatments, 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 through 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.
The cleaning neutralization is 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 lubricated adhesive layer to steel pipe to be provided, and 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, in distortion, can well keep continuity, 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 through interior outer mold to obtain Dimensions be that the precision 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, be placed in the outer pipe orifice of 20# pipe in the 45Mn2 after the alignment 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 the combination defective tightness between then interior pipe of this numerical value and the outer tube, then cost performance is not high to be higher than this numerical value, and distortion is bigger.
5, the concrete technical order of the compound back of precision finished product is following:
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 (2)
1. a composite bimetal pipe is characterized in that: connect through 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202507559U CN202176830U (en) | 2011-07-15 | 2011-07-15 | Thermometal composite tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202507559U CN202176830U (en) | 2011-07-15 | 2011-07-15 | Thermometal composite tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202176830U true CN202176830U (en) | 2012-03-28 |
Family
ID=45866708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202507559U Expired - Lifetime CN202176830U (en) | 2011-07-15 | 2011-07-15 | Thermometal composite tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202176830U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278541A (en) * | 2011-07-15 | 2011-12-14 | 宜昌中南精密钢管有限公司 | Bimetallic composite pipe and preparation method |
| CN103557375A (en) * | 2013-03-20 | 2014-02-05 | 天津市联众钢管有限公司 | Composite pump truck arm frame delivery pipe and processing technology thereof |
| CN104197106A (en) * | 2014-08-28 | 2014-12-10 | 安徽中臣机电装备科技有限公司 | Abrasion-resistant composite steel tube |
-
2011
- 2011-07-15 CN CN2011202507559U patent/CN202176830U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278541A (en) * | 2011-07-15 | 2011-12-14 | 宜昌中南精密钢管有限公司 | Bimetallic composite pipe and preparation method |
| CN103557375A (en) * | 2013-03-20 | 2014-02-05 | 天津市联众钢管有限公司 | Composite pump truck arm frame delivery pipe and processing technology thereof |
| CN103557375B (en) * | 2013-03-20 | 2017-01-25 | 天津市联众钢管有限公司 | Composite pump truck arm frame delivery pipe and processing technology thereof |
| CN104197106A (en) * | 2014-08-28 | 2014-12-10 | 安徽中臣机电装备科技有限公司 | Abrasion-resistant composite steel tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120328 |
|
| CX01 | Expiry of patent term |