WO2017121026A1 - 一种不锈钢复合管的制造方法 - Google Patents

一种不锈钢复合管的制造方法 Download PDF

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Publication number
WO2017121026A1
WO2017121026A1 PCT/CN2016/076203 CN2016076203W WO2017121026A1 WO 2017121026 A1 WO2017121026 A1 WO 2017121026A1 CN 2016076203 W CN2016076203 W CN 2016076203W WO 2017121026 A1 WO2017121026 A1 WO 2017121026A1
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Prior art keywords
stainless steel
tube
steel composite
pipe
composite pipe
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PCT/CN2016/076203
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English (en)
French (fr)
Inventor
何建忠
王振中
陈琴珠
王学生
庄国栋
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上海天阳钢管有限公司
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Publication of WO2017121026A1 publication Critical patent/WO2017121026A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes

Definitions

  • the invention relates to the field of bimetal steel pipe processing, and relates to a method for manufacturing a stainless steel composite pipe.
  • the spinning method is to place a spinning mold in the inner tube, and then through a mechanical transmission mechanism, the spinning mold is driven to plastically deform the inner tube metal and fit on the inner surface of the outer tube.
  • the traditional drawing method is to place a conical mold in the inner tube of the bimetal tube, and at the same time, the mechanical drawing mechanism is connected to the small head portion of the conical mold, and the metal of the inner tube is plasticized by the expansion of the large portion of the conical mold of the mold. Deformed and attached to the inner surface of the outer tube.
  • the hydrostatic pressure method uses the hydraulic principle to close both ends of the inner tube, and then enters the industrial water through the inner tube, so that the inner tube metal is plastically deformed and attached to the inner surface of the outer tube.
  • Explosive molding is the use of pyrotechnics for assembly, leaving a suitable length of pyrotechnics at the detonation end of the base pipe to connect the detonator. And in the assembly of the base, the liner is assembled at the end of the tube, and the base and the liner are evacuated by a vacuum pump, so that the inner and outer tubes form a composite under the action of instantaneous high temperature and strong explosive force.
  • the spinning method, the traditional drawing method, the hydrostatic pressure method have insufficient internal and external tube bonding forces, and the phenomenon that the inner and outer tubes fall off easily under high temperature working conditions.
  • the explosion molding method because of the instantaneous deformation, has a phenomenon that the bonding force of each part is uneven, which tends to cause uneven thermal conductivity of the steel pipe, resulting in unstable product performance.
  • the manufacturing method adopts a new technology of ternary composite to perfectly combine two steel pipes of different materials, and the bonding force is super strong.
  • the thermal conductivity of stainless steel tubes is the most critical indicator for this application due to the use of heat exchangers in Sanhua, and because the tubes need to be bent and deformed during processing.
  • the heat will be blocked during the transfer process, and the overall thermal conductivity cannot be guaranteed; at the same time, the two layers of metal are concentrated due to plastic deformation. The phenomenon, therefore, if these bimetallic tubes are bent and formed, cracking of the steel pipe may occur, and it is practically impossible to perform on-site assembly.
  • the technical problem to be solved by the present invention is to provide a stainless steel composite pipe with uniform heat conduction and less cracking. Manufacturing method.
  • a method for manufacturing a stainless steel composite pipe the specific steps of the manufacturing method are as follows:
  • the outer tube is made of carbon steel pipe
  • the inner tube is made of stainless steel tube
  • the inner and outer tubes are pre-retained with a gap of 1-5mm; at the same time, the straightness of the inner and outer tubes is required to ensure no more than 1.5mm/m;
  • the outer tube is placed in a 12-15% hydrochloric acid solution to remove the scale and rust layer of the skin; then the outer tube is placed in a concentration of 5%-7% by volume of phosphorus.
  • a 1-2 Torr accelerator is added for intermediate phosphating; finally, the outer tube is placed in a saponification solution for surface lubrication;
  • the inner tube After the outer tube is placed, the inner tube is pushed into the inner hole of the outer tube at the same time; when the inner and outer tube walls are touched together and cannot be advanced, the sleeve is not applied with force;
  • the inner and outer tubes are placed in a protective atmosphere and processed in a continuous heating furnace at 650-1000 ° C for 1.5-2.5 hours, and then cooled out through the furnace;
  • the phosphating solution in the step (2) is phosphoric acid, zinc oxide, Any one of zinc nitrate, calcium nitrate, nickel nitrate, and citric acid; the accelerator is any one of soda ash and sodium nitrate; and the saponification liquid is any one of soda ash, stearic acid, and paraffin wax.
  • the tallow in the step (3) is a lithium base grease, and the lime is slaked lime; the mass ratio of the tallow to the lime is butter: lime is 1.5:6-15 .
  • the thickness of the polymeric layer in the step (4) is from 0.01 to 0.1 mm.
  • the thickness of the polymeric layer in the step (4) is 0.02-0.05 mm.
  • the polymer layer in the step (4) is any one of a copper-based solder, a nickel-based solder, an aluminum-based solder, and a silver-based solder.
  • the coating of the polymer layer in the step (4) is specifically a longitudinal coating, a spiral wrapping coating or a spreading coating, and the polymeric layers formed are respectively a thin skin structure and a filament shape. Structure, powder structure, paste or a mixture of several of them.
  • the intermediate cleaning in the step (9) is to put a fixed inner and outer tube into a degreasing agent having a temperature of 65 ° C or more and soak for 30 minutes or more, and then put it into a clean water tank. In the middle, the water with a pressure greater than 0.5 MPa is flushed from one end of the steel pipe to the other end.
  • the semi-finished cleaning in the step (13) is to soak the stainless steel composite pipe detected by water pressure into a degreasing agent having a temperature of 65 ° C or more for more than 15 minutes, and then put it into the In the clean water tank, the water having a pressure greater than 0.5 MPa is flushed from one end of the stainless steel composite pipe until it flows out from the other end.
  • the protective atmosphere in the step (10) is a reducing gas.
  • the invention provides a preparation method of a stainless steel composite pipe with high thermal conductivity, strong bonding force, 100% bonding ratio and low production cost.
  • FIG. 1 is a flow chart of a method of manufacturing a stainless steel composite pipe of the present invention
  • the manufacturing method of the stainless steel composite pipe of the present invention is prepared by "preparing the raw material of the inner and outer pipes of the stainless steel composite pipe ⁇ the phosphoric acid soap to the outer pipe ⁇ applying the butter lime on the inner surface of the inner pipe ⁇ covering the outer surface of the inner pipe Polymerization layer ⁇ Inner and outer tube for casing ⁇ Contraction processing of casing ⁇ Bottom drawing ⁇ Stainless steel composite pipe cutting head and tail length ⁇ Stainless steel composite pipe raw material cleaning ⁇ heat treatment ⁇ straightening ⁇ water pressure detection ⁇ semi-finished product cleaning ⁇ bubble prevention
  • the process of rusting water and draining ⁇ packaging into the warehouse is started, starting from the preparation of the raw material of the stainless steel composite pipe, passing through the outer tube acid phosphate soap treatment tank, the inner surface of the inner tube is coated with a tallow lime device, and the outer surface of the inner tube is covered with a polymer layer.
  • the invention discloses a method for manufacturing a stainless steel composite pipe.
  • the inner pipe of the stainless steel composite pipe is a stainless steel pipe
  • the outer pipe is a carbon steel pipe.
  • the copper base brazing material is coated on the outer surface of the stainless steel pipe, and the copper base brazing material is heat treated by a continuous heating furnace.
  • the layer is closely polymerized with the inner and outer tubes, and the specific steps of the manufacturing method are as follows:
  • the outer tube is made of carbon steel pipe that meets the requirements of GB/T8163 (EN10210, ASTM A106).
  • the outer diameter is 35mm* and the wall thickness is 1.6mm.
  • the inner tube is made of stainless steel tube of 316 material conforming to GB/T14975 (EN10216, ASTM A312).
  • the specification is the outer diameter 28mm* wall thickness 1.05mm; the gap between the inner and outer tubes is pre-retained 1-5mm; at the same time, the straightness of the inner and outer tubes is required to ensure no more than 1.5mm/m;
  • the outer tube is placed in a 12% hydrochloric acid solution to remove the oxide scale and the rust layer of the skin; then the outer tube is placed in a phosphating solution at a concentration of 5% by volume, and Add 1 ⁇ of accelerator to carry out intermediate phosphating; finally, put the outer tube into the saponification solution for surface lubrication;
  • phosphating solution is any of phosphoric acid, zinc oxide, zinc nitrate, calcium nitrate, nickel nitrate and citric acid.
  • the accelerator is any one of pure alkali and sodium nitrate
  • the saponification liquid is any one of soda ash, stearic acid and paraffin;
  • the stainless steel tube is lubricated by applying a mixture of butter and lime on the inner wall of the steel tube. Note that the application must be uniform, and the stainless steel coated with butter lime should be used with a dryer below 100 °C. Tube drying; butter is lithium base grease, lime is slaked lime; the ratio of butter to lime is butter: lime is 1.5:6;
  • the outer surface of the inner tube is coated with a copper-based solder, and the thickness of the copper-based solder is 0.02 mm, and the coating method is longitudinal coating, spiral wrapping or spreading coating, and the formed polymer layers are respectively a thin skin structure, a network structure or a powder structure;
  • the 20T drawing machine is selected, the appropriate outer mold is selected, and the Soviet internal mold is installed, and the drawing is performed according to the normal seamless cold drawn steel pipe process;
  • the intermediate cleaning is to put the inner and outer tubes of a fixed size into the degreasing agent with a temperature of 65 ° C or higher for more than 30 minutes, then put them into the clean water tank, and flush the water from one end of the steel pipe to the other from the water with a pressure greater than 0.5 MPa. Flow out at one end;
  • the inner and outer tubes are placed in a reducing gas and processed in a continuous heating furnace at 650 ° C for 1.5 hours, and then cooled out through the furnace;
  • the distance between the main and passive rectifying rolls and the geometric angle are adjusted.
  • the geometric angle is the maximum contact surface between the finished steel pipe and the rectifying roller, and the finished steel pipe (outer diameter 25mm* wall thickness 2.5mm) Straightening between the main and passive rectifying rollers of the straightening machine;
  • the semi-finished product cleaning is to put the stainless steel composite pipe which is tested by water pressure into the degreasing agent with the temperature above 65 °C for more than 15 minutes, then put it into the clean water tank, and wash it from the end of the stainless steel composite pipe with the water with the pressure greater than 0.5MPa. Into the flow from the other end;
  • the composite steel pipe manufactured by the invention has a thermal conductivity of 24 and a bonding force of 210 MPa.
  • the invention discloses a method for manufacturing a stainless steel composite pipe.
  • the inner pipe of the stainless steel composite pipe is a stainless steel pipe
  • the outer pipe is a carbon steel pipe.
  • the nickel base brazing material is coated on the outer surface of the stainless steel pipe, and then the nickel base brazing material is heat treated by the continuous heating furnace.
  • the polymerization process is closely combined with the inner and outer tubes.
  • the specific steps of the manufacturing method are as follows:
  • the outer tube is made of carbon steel pipe that meets the requirements of GB/T8163 (EN10210, ASTM A106).
  • the outer diameter is 35mm* and the wall thickness is 1.6mm.
  • the inner tube is made of stainless steel tube of 316 material conforming to GB/T14975 (EN10216, ASTM A312).
  • the specification is the outer diameter 28mm* wall thickness 1.05mm; the gap between the inner and outer tubes is pre-retained 1-5mm; at the same time, the straightness of the inner and outer tubes is required to ensure no more than 1.5mm/m;
  • the outer tube is placed in a 13% hydrochloric acid solution to remove the scale and rust layer of the skin; then the outer tube is placed in a phosphating solution having a concentration of 6% by volume, and Add 1.5 ⁇ promoter to carry out intermediate phosphating; finally, put the outer tube into the saponification solution for surface lubrication;
  • phosphating solution is any of phosphoric acid, zinc oxide, zinc nitrate, calcium nitrate, nickel nitrate and citric acid.
  • the accelerator is any one of pure alkali and sodium nitrate
  • the saponification liquid is any one of soda ash, stearic acid and paraffin;
  • the stainless steel tube is lubricated by applying a mixture of butter and lime on the inner wall of the steel tube. Note that the application must be uniform, and the stainless steel coated with butter lime should be used with a dryer below 100 °C. Tube drying; butter is lithium base grease, lime is slaked lime; the ratio of butter to lime is butter: lime is 1.5:10;
  • the outer surface of the inner tube is coated with a nickel-based brazing filler metal, and the thickness of the nickel-based brazing filler metal is 0.04 mm, and the coating method is longitudinal coating, spiral wrapping coating or spreading coating, and the formed polymeric layers are respectively a thin skin structure, a network structure or a powder structure;
  • the 20T drawing machine is selected, the appropriate outer mold is selected, and the Soviet internal mold is installed, and the drawing is performed according to the normal seamless cold drawn steel pipe process;
  • the intermediate cleaning is to put the inner and outer tubes of a fixed size into the degreasing agent with a temperature of 65 ° C or higher for more than 30 minutes, then put them into the clean water tank, and flush the water from one end of the steel pipe to the other from the water with a pressure greater than 0.5 MPa. Flow out at one end;
  • the inner and outer tubes are placed in a reducing gas and processed in a continuous heating furnace at 750 ° C for 2 hours, and then cooled out through the furnace;
  • the distance between the main and passive rectifying rolls and the geometric angle are adjusted.
  • the geometric angle is the maximum contact surface between the finished steel pipe and the rectifying roller, and the finished steel pipe (outer diameter 25mm* wall thickness 2.5mm) Straightening between the main and passive rectifying rollers of the straightening machine;
  • the semi-finished product cleaning is to put the stainless steel composite pipe which is tested by water pressure into the degreasing agent with the temperature above 65 °C for more than 15 minutes, then put it into the clean water tank, and wash it from the end of the stainless steel composite pipe with the water with the pressure greater than 0.5MPa. Into the flow from the other end;
  • the composite steel pipe manufactured by the invention has a thermal conductivity of 25 and a bonding force of 240 MPa.
  • the invention discloses a method for manufacturing a stainless steel composite pipe.
  • the inner pipe of the stainless steel composite pipe is a stainless steel pipe
  • the outer pipe is a carbon steel pipe.
  • the aluminum base brazing material is coated on the outer surface of the stainless steel pipe, and the aluminum base brazing material is heat treated by a continuous heating furnace.
  • the polymerization process is closely combined with the inner and outer tubes.
  • the specific steps of the manufacturing method are as follows:
  • the outer tube is made of carbon steel pipe that meets the requirements of GB/T8163 (EN10210, ASTM A106).
  • the outer diameter is 35mm* and the wall thickness is 1.6mm.
  • the inner tube is made of stainless steel tube of 316 material conforming to GB/T14975 (EN10216, ASTM A312).
  • the specification is the outer diameter 28mm* wall thickness 1.05mm; the gap between the inner and outer tubes is pre-retained 1-5mm; at the same time, the straightness of the inner and outer tubes is required to ensure no more than 1.5mm/m;
  • the outer tube is placed in a 14% hydrochloric acid solution to remove the oxide scale and the rust layer of the skin; then the outer tube is placed in a phosphating solution having a concentration of 7% by volume, and Add 2 ⁇ promoter to carry out intermediate phosphating; finally, put the outer tube into the saponification solution for surface lubrication;
  • phosphating solution is any of phosphoric acid, zinc oxide, zinc nitrate, calcium nitrate, nickel nitrate and citric acid.
  • the accelerator is any one of soda ash and sodium nitrate
  • the saponification liquid is in soda ash, stearic acid, paraffin Any one;
  • the stainless steel tube is lubricated by applying a mixture of butter and lime on the inner wall of the steel tube. Note that the application must be uniform, and the stainless steel coated with butter lime should be used with a dryer below 100 °C. Tube drying; tallow is lithium base grease, lime is slaked lime; the ratio of butter to lime is butter: lime is 1.5:12;
  • the outer surface of the inner tube is coated with an aluminum-based solder, and the thickness of the aluminum-based solder is 0.05 mm, and the coating method is longitudinal coating, spiral wrapping or spreading coating, and the formed polymer layers are respectively a thin skin structure, a network structure or a powder structure;
  • the 20T drawing machine is selected, the appropriate outer mold is selected, and the Soviet internal mold is installed, and the drawing is performed according to the normal seamless cold drawn steel pipe process;
  • the intermediate cleaning is to put the inner and outer tubes of a fixed size into the degreasing agent with a temperature of 65 ° C or higher for more than 30 minutes, then put them into the clean water tank, and flush the water from one end of the steel pipe to the other from the water with a pressure greater than 0.5 MPa. Flow out at one end;
  • the inner and outer tubes are placed in a reducing gas and processed in a continuous heating furnace at 850 ° C for 2.5 hours, and then cooled out through the furnace;
  • the distance between the main and passive rectifying rolls and the geometric angle are adjusted.
  • the geometric angle is the maximum contact surface between the finished steel pipe and the rectifying roller, and the finished steel pipe (outer diameter 25mm* wall thickness) 2.5mm) is straightened between the main and passive rectifying rollers of the straightening machine;
  • the semi-finished product cleaning is to put the stainless steel composite pipe which is tested by water pressure into the degreasing agent with the temperature above 65 °C for more than 15 minutes, then put it into the clean water tank, and wash it from the end of the stainless steel composite pipe with the water with the pressure greater than 0.5MPa. Into the flow from the other end;
  • the composite steel pipe manufactured by the invention has a thermal conductivity of 26 and a bonding force of 250 MPa.
  • the invention discloses a method for manufacturing a stainless steel composite pipe.
  • the inner pipe of the stainless steel composite pipe is a stainless steel pipe
  • the outer pipe is a carbon steel pipe.
  • the silver base brazing material is coated on the outer surface of the stainless steel pipe, and the silver base brazing material is heat treated by a continuous heating furnace.
  • the polymerization process is closely combined with the inner and outer tubes.
  • the specific steps of the manufacturing method are as follows:
  • the outer tube is made of carbon steel pipe that meets the requirements of GB/T8163 (EN10210, ASTM A106).
  • the outer diameter is 35mm* and the wall thickness is 1.6mm.
  • the inner tube is made of stainless steel tube of 316 material conforming to GB/T14975 (EN10216, ASTM A312).
  • the specification is the outer diameter 28mm* wall thickness 1.05mm; the gap between the inner and outer tubes is pre-retained 1-5mm; at the same time, the straightness of the inner and outer tubes is required to ensure no more than 1.5mm/m;
  • the outer tube is placed in a 15% hydrochloric acid solution to remove the oxide scale and the rust layer of the skin; then the outer tube is placed in a phosphating solution having a concentration of 7% by volume, and Add 2 ⁇ promoter to carry out intermediate phosphating; finally, put the outer tube into the saponification solution for surface lubrication;
  • phosphating solution is any of phosphoric acid, zinc oxide, zinc nitrate, calcium nitrate, nickel nitrate and citric acid.
  • the accelerator is any one of pure alkali and sodium nitrate
  • the saponification liquid is any one of soda ash, stearic acid and paraffin;
  • the stainless steel tube is lubricated by applying a mixture of butter and lime on the inner wall of the steel tube. Note that the application must be uniform, and the stainless steel coated with butter lime should be used with a dryer below 100 °C. Tube drying; butter is lithium base grease, lime is slaked lime; the ratio of butter to lime is butter: lime is 1.5:15;
  • the outer surface of the inner tube is coated with a silver-based solder, and the thickness of the silver-based solder is 0.05 mm, and the coating method is longitudinal coating, spiral wrapping or spreading coating, and the formed polymer layers are respectively a thin skin structure, a network structure or a powder structure;
  • the 20T drawing machine is selected, the appropriate outer mold is selected, and the Soviet internal mold is installed, and the drawing is performed according to the normal seamless cold drawn steel pipe process;
  • the intermediate cleaning is to put the inner and outer tubes of a fixed size into the degreasing agent with a temperature of 65 ° C or higher for more than 30 minutes, then put them into the clean water tank, and flush the water from one end of the steel pipe to the other from the water with a pressure greater than 0.5 MPa. Flow out at one end;
  • the inner and outer tubes are placed in a reducing gas and processed in a continuous heating furnace at 1000 ° C for 2.5 hours, and then cooled out through the furnace;
  • the semi-finished product cleaning is to put the stainless steel composite pipe which is tested by water pressure into the degreasing agent with the temperature above 65 °C for more than 15 minutes, then put it into the clean water tank, and wash it from the end of the stainless steel composite pipe with the water with the pressure greater than 0.5MPa. Into the flow from the other end;
  • the composite steel pipe manufactured by the invention has a thermal conductivity of 28 and a bonding force of 260 MPa.
  • the invention relates to a method for manufacturing a stainless steel composite pipe.
  • the inner pipe of the stainless steel composite pipe is a carbon steel pipe and the outer pipe is a stainless steel pipe.
  • the copper base brazing material is coated on the outer surface of the carbon steel pipe, and the copper base brazing material is heat treated by a continuous heating furnace.
  • the layer is closely polymerized with the inner and outer tubes, and the specific steps of the manufacturing method are as follows:
  • the inner tube adopts carbon steel pipe which meets the requirements of GB/T8163 (EN10210, ASTM A106).
  • the specification is outer diameter 35mm* wall thickness 1.6mm; the outer tube adopts stainless steel pipe of 316 material conforming to GB/T14975 (EN10216, ASTM A312) standard.
  • the specification is the outer diameter 28mm* wall thickness 1.05mm; the gap between the inner and outer tubes is pre-retained 1-5mm; at the same time, the straightness of the inner and outer tubes is required to ensure no more than 1.5mm/m;
  • the inner tube is placed in a 12% hydrochloric acid solution to remove the oxide scale and the rust layer of the skin; then the inner tube is placed in a phosphating solution having a concentration of 5% by volume, and Add 1 ⁇ of accelerator for intermediate phosphating; finally, put the inner tube into the saponification solution for surface Lubricating;
  • the phosphating solution is any one of phosphoric acid, zinc oxide, zinc nitrate, calcium nitrate, nickel nitrate, and citric acid;
  • the promoter is any one of soda ash and sodium nitrate;
  • the saponifying solution is soda ash, stearic acid, Any one of the paraffin wax; after the inner tube acid phosphate soap is completed, the two ends are capped, and then the inner tube is placed in a 15% hydrochloric acid solution to remove the chemical layer on the surface;
  • the stainless steel tube is lubricated by applying a mixture of butter and lime on the inner wall of the steel tube. Note that the application must be uniform, and the stainless steel coated with butter lime should be used with a dryer below 100 °C. Tube drying; butter is lithium base grease, lime is slaked lime; the ratio of butter to lime is butter: lime is 1.5:6;
  • the outer surface of the inner tube is coated with a copper-based solder, and the thickness of the bronze-based solder is 0.02 mm, and the coating method is longitudinal coating, spiral wrapping or spreading coating, and the formed polymer layers are respectively a thin skin structure, a network structure or a powder structure;
  • the 20T drawing machine is selected, the appropriate outer mold is selected, and the Soviet internal mold is installed, and the drawing is performed according to the normal seamless cold drawn steel pipe process;
  • the intermediate cleaning is to put the inner and outer tubes of a fixed size into the degreasing agent with a temperature of 65 ° C or higher for more than 30 minutes, then put them into the clean water tank, and flush the water from one end of the steel pipe to the other from the water with a pressure greater than 0.5 MPa. Flow out at one end;
  • the inner and outer tubes are placed in a reducing gas and processed in a continuous heating furnace at 650 ° C for 1.5 hours, and then cooled out through the furnace;
  • the distance between the main and passive rectifying rolls and the geometric angle are adjusted.
  • the geometric angle is the maximum contact surface between the finished steel pipe and the rectifying roller, and the finished steel pipe (outer diameter 25mm* wall thickness 2.5mm) Straightening between the main and passive rectifying rollers of the straightening machine;
  • the semi-finished product cleaning is to put the stainless steel composite pipe which is tested by water pressure into the degreasing agent with the temperature above 65 °C for more than 15 minutes, then put it into the clean water tank, and wash it from the end of the stainless steel composite pipe with the water with the pressure greater than 0.5MPa. Into the flow from the other end;
  • the composite steel pipe manufactured by the invention has a thermal conductivity of 24 and a bonding force of 210 MPa.
  • the invention discloses a method for manufacturing a stainless steel composite pipe.
  • the inner pipe of the stainless steel composite pipe is a carbon steel pipe
  • the outer pipe is a stainless steel pipe.
  • the nickel base brazing material is coated on the outer surface of the stainless steel pipe, and the nickel base brazing material is heat treated by the continuous heating furnace.
  • the polymerization process is closely combined with the inner and outer tubes.
  • the specific steps of the manufacturing method are as follows:
  • the inner tube adopts carbon steel pipe which meets the requirements of GB/T8163 (EN10210, ASTM A106).
  • the specification is outer diameter 35mm* wall thickness 1.6mm; the outer tube adopts stainless steel pipe of 316 material conforming to GB/T14975 (EN10216, ASTM A312) standard.
  • the specification is the outer diameter 28mm* wall thickness 1.05mm; the gap between the inner and outer tubes is pre-retained 1-5mm; at the same time, the straightness of the inner and outer tubes is required to ensure no more than 1.5mm/m;
  • the inner tube is placed in a 13% hydrochloric acid solution, In addition to the oxide scale and rust layer of the epidermis; then the inner tube is placed in a phosphating solution at a concentration of 6% by volume, and a 1.5 ⁇ accelerator is added for intermediate phosphating; finally, the inner tube is placed in the saponification solution.
  • phosphating solution is any one of phosphoric acid, zinc oxide, zinc nitrate, calcium nitrate, nickel nitrate, and citric acid
  • the accelerator is any one of soda ash and sodium nitrate
  • the saponification solution is soda ash, hard Any one of fatty acid and paraffin
  • the inner tube acid phosphate soap is capped on both ends, and then the inner tube is placed in a 15% hydrochloric acid solution to remove the chemical layer on the surface;
  • the stainless steel tube is lubricated by applying a mixture of butter and lime on the inner wall of the steel tube. Note that the application must be uniform, and the stainless steel coated with butter lime should be used with a dryer below 100 °C. Tube drying; butter is lithium base grease, lime is slaked lime; the ratio of butter to lime is butter: lime is 1.5:10;
  • the outer surface of the inner tube is coated with a nickel-based brazing filler metal, and the thickness of the nickel-based brazing filler metal is 0.04 mm, and the coating method is longitudinal coating, spiral wrapping coating or spreading coating, and the formed polymeric layers are respectively a thin skin structure, a network structure or a powder structure;
  • the inner tube is pushed into the inner tube of the outer tube at the same time; if the inner and outer tube walls are touched together and cannot be advanced, the force is not applied;
  • the 20T drawing machine is selected, the appropriate outer mold is selected, and the Soviet internal mold is installed, and the drawing is performed according to the normal seamless cold drawn steel pipe process;
  • the intermediate cleaning is to put the inner and outer tubes of a fixed size into the degreasing agent with a temperature of 65 ° C or higher for more than 30 minutes, then put them into the clean water tank, and flush the water from one end of the steel pipe to the other from the water with a pressure greater than 0.5 MPa. Flow out at one end;
  • the inner and outer tubes are placed in a reducing gas and processed in a continuous heating furnace at 750 ° C for 2 hours, and then cooled out through the furnace;
  • the distance between the main and passive rectifying rolls and the geometric angle are adjusted.
  • the geometric angle is the maximum contact surface between the finished steel pipe and the rectifying roller, and the finished steel pipe (outer diameter 25mm* wall thickness 2.5mm) Straightening between the main and passive rectifying rollers of the straightening machine;
  • the semi-finished product cleaning is to put the stainless steel composite pipe which is tested by water pressure into the degreasing agent with the temperature above 65 °C for more than 15 minutes, then put it into the clean water tank, and wash it from the end of the stainless steel composite pipe with the water with the pressure greater than 0.5MPa. Into the flow from the other end;
  • the composite steel pipe manufactured by the invention has a thermal conductivity of 25 and a bonding force of 240 MPa.
  • the invention relates to a method for manufacturing a stainless steel composite pipe.
  • the inner pipe of the stainless steel composite pipe is a carbon steel pipe and the outer pipe is a stainless steel pipe.
  • the aluminum base brazing material is coated on the outer surface of the carbon steel pipe, and the aluminum base brazing material is heat treated by a continuous heating furnace.
  • the polymerization process is closely combined with the inner and outer tubes.
  • the specific steps of the manufacturing method are as follows:
  • the inner tube adopts carbon steel pipe which meets the requirements of GB/T8163 (EN10210, ASTM A106).
  • the specification is outer diameter 35mm* wall thickness 1.6mm; the outer tube adopts stainless steel pipe of 316 material conforming to GB/T14975 (EN10216, ASTM A312) standard.
  • the specification is the outer diameter 28mm* wall thickness 1.05mm; the gap between the inner and outer tubes is pre-retained 1-5mm; at the same time, the straightness of the inner and outer tubes is required to ensure no more than 1.5mm/m;
  • the inner tube is placed in a 14% hydrochloric acid solution to remove the oxide scale and the rust layer of the skin; then the inner tube is placed in a phosphating solution having a concentration of 7% by volume, and Add 2 ⁇ promoter to carry out intermediate phosphating; finally, put the inner tube into the saponification solution for surface lubrication; phosphating solution is any of phosphoric acid, zinc oxide, zinc nitrate, calcium nitrate, nickel nitrate and citric acid.
  • the accelerator is any one of pure alkali and sodium nitrate;
  • the saponification liquid is any one of soda ash, stearic acid and paraffin; after the inner tube acid phosphate soap is finished, the two ends are covered, and then the inner tube is placed Removing the chemical layer of the surface in a 15% hydrochloric acid solution;
  • the stainless steel tube is lubricated by applying a mixture of butter and lime on the inner wall of the steel tube. Note that the application must be uniform, and the stainless steel coated with butter lime should be used with a dryer below 100 °C. Tube drying; tallow is lithium base grease, lime is slaked lime; the ratio of butter to lime is butter: lime is 1.5:12;
  • the outer surface of the inner tube is coated with an aluminum-based solder, and the thickness of the aluminum-based solder is 0.05 mm, and the coating method is longitudinal coating, spiral wrapping or spreading coating, and the formed polymer layers are respectively a thin skin structure, a network structure or a powder structure;
  • the inner tube is pushed into the inner tube of the outer tube at the same time; if the inner and outer tube walls are touched together and cannot be advanced, the force is not applied;
  • the 20T drawing machine is selected, the appropriate outer mold is selected, and the Soviet internal mold is installed, and the drawing is performed according to the normal seamless cold drawn steel pipe process;
  • the inner and outer tubes of a fixed length are placed in a degreasing agent with a temperature of 65 ° C or higher for more than 30 minutes, and then placed in a clean water tank, and flushed from one end of the steel tube with clean water having a pressure greater than 0.5 MPa. Until flowing out from the other end;
  • the inner and outer tubes are placed in a reducing gas and processed in a continuous heating furnace at 850 ° C for 2.5 hours, and then cooled out through the furnace;
  • the distance between the main and passive rectifying rolls and the geometric angle are adjusted.
  • the geometric angle is the maximum contact surface between the finished steel pipe and the rectifying roller, and the finished steel pipe (outer diameter 25mm* wall thickness 2.5mm) Straightening between the main and passive rectifying rollers of the straightening machine;
  • the semi-finished product cleaning is to put the stainless steel composite pipe which is tested by water pressure into the degreasing agent with the temperature above 65 °C for more than 15 minutes, then put it into the clean water tank, and wash it from the end of the stainless steel composite pipe with the water with the pressure greater than 0.5MPa. Into the flow from the other end;
  • the composite steel pipe manufactured by the invention has a thermal conductivity of 26 and a bonding force of 250 MPa.
  • the invention relates to a method for manufacturing a stainless steel composite pipe.
  • the inner pipe of the stainless steel composite pipe is a carbon steel pipe and the outer pipe is a stainless steel pipe.
  • the silver base brazing material is coated on the outer surface of the carbon steel pipe, and the silver base brazing material is heat treated by a continuous heating furnace.
  • the polymerization process is closely combined with the inner and outer tubes. The specific steps of the manufacturing method are as follows:
  • the inner tube adopts carbon steel pipe that meets the requirements of GB/T8163 (EN10210, ASTM A106).
  • the specification is outer diameter 35mm* wall thickness 1.6mm; the outer tube adopts GB/T14975 (EN10216, ASTM A312) standard.
  • Quasi-316 stainless steel pipe the outer diameter is 28mm*, the wall thickness is 1.05mm; the inner and outer pipes are pre-retained with a gap of 1-5mm; at the same time, the straightness of the inner and outer pipes is required to ensure no more than 1.5mm/m;
  • the inner tube is placed in a 15% hydrochloric acid solution to remove the scale and rust layer of the skin; then the inner tube is placed in a phosphating solution having a concentration of 7% by volume, and Add 2 ⁇ promoter to carry out intermediate phosphating; finally, put the inner tube into the saponification solution for surface lubrication; phosphating solution is any of phosphoric acid, zinc oxide, zinc nitrate, calcium nitrate, nickel nitrate and citric acid.
  • the accelerator is any one of pure alkali and sodium nitrate;
  • the saponification liquid is any one of soda ash, stearic acid and paraffin; after the inner tube acid phosphate soap is finished, the two ends are covered, and then the inner tube is placed Removing the chemical layer of the surface in a 15% hydrochloric acid solution;
  • the stainless steel tube is lubricated by applying a mixture of butter and lime on the inner wall of the steel tube. Note that the application must be uniform, and the stainless steel coated with butter lime should be used with a dryer below 100 °C. Tube drying; butter is lithium base grease, lime is slaked lime; the ratio of butter to lime is butter: lime is 1.5:15;
  • the outer surface of the inner tube is coated with a silver-based solder, and the thickness of the silver-based solder is 0.05 mm, and the coating method is longitudinal coating, spiral wrapping or spreading coating, and the formed polymer layers are respectively a thin skin structure, a network structure or a powder structure;
  • the inner tube is pushed into the inner tube of the outer tube at the same time; if the inner and outer tube walls are touched together and cannot be advanced, the force is not applied;
  • the 20T drawing machine is selected, the appropriate outer mold is selected, and the Soviet internal mold is installed, and the drawing is performed according to the normal seamless cold drawn steel pipe process;
  • the intermediate cleaning is to put the inner and outer tubes of a fixed size into the degreasing agent with a temperature of 65 ° C or higher for more than 30 minutes, then put them into the clean water tank, and flush the water from one end of the steel pipe to the other from the water with a pressure greater than 0.5 MPa. Flow out at one end;
  • the inner and outer tubes are placed in a reducing gas and processed in a continuous heating furnace at 1000 ° C for 2.5 hours, and then cooled out through the furnace;
  • the distance between the main and passive rectifying rolls and the geometric angle are adjusted.
  • the geometric angle is the maximum contact surface between the finished steel pipe and the rectifying roller, and the finished steel pipe (outer diameter 25mm* wall thickness 2.5mm) Straightening between the main and passive rectifying rollers of the straightening machine;
  • the semi-finished product cleaning is to put the stainless steel composite pipe which is tested by water pressure into the degreasing agent with the temperature above 65 °C for more than 15 minutes, then put it into the clean water tank, and wash it from the end of the stainless steel composite pipe with the water with the pressure greater than 0.5MPa. Into the flow from the other end;
  • the composite steel pipe manufactured by the invention has a thermal conductivity of 28 and a bonding force of 260 MPa.

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Abstract

一种不锈钢复合管的制造方法，在不锈钢复合管内管的表面包覆一层0.01-0.1mm的聚合层，再将该内管放入到外管里面，进行两种钢管的拉拔成型；其过程为：准备内外管原材料→对外管外表面进行润滑→内管的内表面进行润滑→在内管外表面缠绕聚合层→内外管进行套管→缩头→拉拔→还原气氛热处理→切头尾定尺→矫直→探伤→半成品清洗→泡防锈水并沥干→包装入库待发。该不锈钢复合管的制造方法解决了内外管贴合力弱，热导率低的问题，明显降低了石油、化工、化肥、电站、造船、制冷、食品、医药、核工业、军工、海工、给排水行业对热交换器不锈钢管的使用量，降低成本，绿色环保节能。

Description

一种不锈钢复合管的制造方法 技术领域
本发明涉及双金属钢管加工领域，涉及一种不锈钢复合管的制造方法。
背景技术
在现有的双金属管生产制造技术中，国内外通常的工艺有旋压法、传统拉拔法、静水压法和爆炸成型法。
其中旋压法是通过在内管中放置一个旋压模具，然后通过机械传动机构，驱使旋压模具将内管金属发生塑性变形，贴合在外管的内表面。
传统拉拔法是在双金属管的内管中放置一个锥形的模具，同时在锥形模具小头部分连接机械拉拔机构，通过模具锥形模具大头部分扩口作用使得内管金属发生塑性变形，贴合在外管的内表面。
静水压法则是借用液压原理，将内管的两端封闭，然后通过往内管打入工业用水，使得内管金属发生塑性变形，贴合在外管的内表面。
爆炸成型法是使用火工品进行装配，在基管起爆端留出合适长度的火工品来连接雷管。并在对装配好的基、衬管在管端装配密封套，和基、衬管之间用真空泵抽气后起爆，使得内外管在瞬间高温和强大的爆炸力作用下形成复合。
但是这四种工艺都存在一些无法克服的缺点，比如：旋压法、传统拉拔法、静水压法存在内外管结合力不足，以及高温工作条件下容易发生内外管脱落的现象。而爆炸成型法，由于是瞬间变型，存在各个部位的结合力不均匀的现象，这个容易导致钢管的热导性能不均匀，导致产品性能不稳定。本制造方法采用三元复合的新工艺将两种不同材质的钢管完美结合在一起，结合力超强。
此外，由于在三化的热交换器应用领域，不锈钢管的导热性对于这种用途是最关键的指标，同时因为管道在加工过程中还需要进行弯曲和变形。而一般的双金属管工艺，由于两层金属间存在间隙，热量在传递过程中在这里会出现隔断的问题，整体的导热性能没法保证；同时两层金属由于在塑性变形后，产生应力集中的现象，因此如果对这些双金属管做弯曲成型加工，可能会发生钢管开裂的现象，实际无法进行现场装配。
发明内容
本发明要解决的技术问题是提供一种导热均匀、不易开裂的不锈钢复合管 的制造方法。
为达到上述目的，本发明的技术方案如下：
一种不锈钢复合管的制造方法，所述制造方法的具体步骤如下：
(1)准备不锈钢复合管内外管原材料
外管采用碳钢管，内管采用不锈钢管；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
(2)对外管进行润滑处理
按照正常冷拔无缝钢管生产工艺，将外管放置在12-15％的盐酸溶液中，去除表皮的氧化皮和锈蚀层；然后把外管放入浓度为5％-7％体积百分比的磷化液中，并添加1-2‰的促进剂进行中间磷化；最后，再把外管放入到皂化液中进行表面润滑；
(3)对内管的内表面进行润滑处理
在内管的内壁涂抹润滑油，并在低于100℃下干燥；
(4)在内管的外表面包覆聚合层
(5)内外管进行套管
待将外管放置好后，同时将内管推放到外管内孔中；内外管壁碰到一起，且无法推进时，不应用力强行套管；
(6)对上述套管后的内外管进行缩头加工
(7)拉拔加工
(8)对拉拔加工后的内外管切头尾定尺
(9)然后进行中间清洗操作
(10)热处理工艺
将内外管放置在保护气氛中在650-1000℃的连续加热炉中加工，且持续1.5-2.5小时，再通过炉胆冷却出炉；
(11)矫直处理
(12)水压检验
(13)半成品清洗
(14)泡防锈水并沥干。
在本发明的一个实施例中，所述步骤(2)中的磷化液为磷酸、氧化锌、 硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一种；所述促进剂为纯碱、硝酸钠中的任意一种；所述皂化液为纯碱、硬脂酸、石蜡中的任意一种。
在本发明的一个实施例中，所述步骤(3)中的牛油为锂基脂，所述石灰为熟石灰；所述牛油和石灰的质量比为牛油：石灰为1.5：6-15。
在本发明的一个实施例中，所述步骤(4)中聚合层的厚度为0.01-0.1mm。
在本发明的一个实施例中，所述步骤(4)中聚合层的厚度为0.02-0.05mm。
在本发明的一个实施例中，所述步骤(4)中聚合层为铜基钎料、镍基钎料、铝基钎料、银基钎料中的任意一种。
在本发明的一个实施例中，所述步骤(4)中聚合层的包覆具体为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、丝状结构、粉状结构、膏体或其中几种的混合物。
在本发明的一个实施例中，所述步骤(9)中的中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入直至从另一头流出。
在本发明的一个实施例中，所述步骤(13)中的半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出。
在本发明的一个实施例中，所述步骤(10)中的保护气氛为还原性气体。
通过上述技术方案，本发明的有益效果是：
本发明提供一种热导率高、结合力强、结合率100％、制作成本低的不锈钢复合管的制备方法。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明不锈钢复合管的制造方法的流程图；
具体实施方式
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面进一步阐述本发明。
参见图1所示，本发明不锈钢复合管制造方法，按照准备“不锈钢复合管内外管原材料→对外管进行酸磷皂→在内管的内表面涂抹牛油石灰→在内管的外表面包覆聚合层→内外管进行套管→把套管进行缩头加工→拉拔加工→不锈钢复合管切头尾定尺→不锈钢复合管原材料清洗→热处理→矫直→水压检测→半成品清洗→泡防锈水并沥干→包装入库待发”的工艺过程，从不锈钢复合管原材料准备开始，依次经过外管酸磷皂处理槽，内管内表面涂抹牛油石灰装置，内管外表面聚合层包覆自动设备，内外管套管系统，缩头机，不锈钢复合管拉拔设备，钢管切割机，脱脂、酸洗、清水冲洗槽，连续加热炉，矫直机，涡流探伤机，以及脱脂、清水冲洗槽，防锈水槽，沥干池，包装打捆区，最后到代发货库位，从而完成了整个不锈钢复合管的生产。
实施例1
一种不锈钢复合管的制造方法，不锈钢复合管的内管为不锈钢钢管、外管为碳钢管，通过在不锈钢钢管的外表面包覆铜基钎料，再通过连续加热炉热处理将铜基钎料层与内、外管紧密的聚合起来，该制造方法的具体步骤如下：
(1)准备不锈钢复合管内外管原材料
外管采用符合GB/T8163(EN10210、ASTM A106)标准要求的碳钢管，规格为外径35mm*壁厚1.6mm；内管采用符合GB/T14975(EN10216、ASTM A312)标准的316材质的不锈钢管，规格为外径28mm*壁厚1.05mm；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
(2)对外管进行酸磷皂
按照正常冷拔无缝钢管生产工艺，将外管放置在12％的盐酸溶液中，去除表皮的氧化皮和锈蚀层；然后把外管放入浓度为5％体积百分比的磷化液中，并添加1‰的促进剂进行中间磷化；最后，再把外管放入到皂化液中进行表面润滑；磷化液为磷酸、氧化锌、硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一种；促进剂为纯碱、硝酸钠中的任意一种；皂化液为纯碱、硬脂酸、石蜡中的任意一种；
(3)对内管的内表面进行润滑处理
由于内管为不锈钢钢管，采用不锈钢管的润滑工艺，即在钢管的内壁涂抹牛油和石灰的混合物，注意涂抹必须要均匀，并用低于100℃的烘干机，将涂抹牛油石灰的不锈钢管烘干；牛油为锂基脂，石灰为熟石灰；牛油和石灰的质量比为牛油：石灰为1.5：6；
(4)在内管的外表面包覆铜基钎料，铜基钎料的厚度为0.02mm，包覆方法为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、网状结构或粉状结构；
(5)内外管进行套管
待将外管放置好后，同时将内管推放到外管内孔中；注意，如果内外管壁碰到一起，且无法推进时，不应用力强行套管；
(6)对上述套管后的内外管进行缩头加工
把已经套在一起的内外管的一端放入到缩头机中进行缩头操作，注意在此操作中必须把内管也要缩头进去；
(7)拉拔加工
根据内外管的尺寸选择20T的拉拔机，选择合适的外模，并安装苏式内模，按照正常的无缝冷拔钢管工艺进行拉拔；
(8)对拉拔加工后的内外管切头尾定尺
(9)然后进行中间清洗操作
中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入直至从另一头流出；
(10)热处理工艺
将内外管放置在还原性气体中在650℃的连续加热炉中加工，且持续1.5小时，再通过炉胆冷却出炉；
(11)矫直处理
根据成品钢管的直径(25mm)调整主、被动矫辊间的距离和几何角度，几何角度以成品钢管和矫辊的接触面最大为准，同时把成品钢管(外径25mm*壁厚2.5mm)在矫直机主被动矫辊之间调成直线；
(12)水压检验，保压10秒，压力20MPa；
(13)半成品清洗
半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出；
(14)泡防锈水并沥干
在半成品清洗之后，将不锈钢复合管放入到浓度为5％的防锈水中，直到气泡全部从钢管端口出尽，并在浸泡过程中翻动钢管至少一次；然后，把成品钢管吊到倾斜的料架上，直至端口水不再滴出；
(15)包装入库待发
把沥干的不锈钢复合管拉进包装区，先用缠绕膜，再用编制袋对钢管包装，并在两端和当中用钢带打包扎紧，再由质检填写合格证后，吊运到代发货区准备发货。
本发明制造出的复合钢管的导热系数为24，结合力为210MPa。
实施例2
一种不锈钢复合管的制造方法，不锈钢复合管的内管为不锈钢钢管、外管为碳钢管，通过在不锈钢钢管的外表面包覆镍基钎料，再通过连续加热炉热处理将镍基钎料与内、外管紧密的聚合起来，该制造方法的具体步骤如下：
(1)准备不锈钢复合管内外管原材料
外管采用符合GB/T8163(EN10210、ASTM A106)标准要求的碳钢管，规格为外径35mm*壁厚1.6mm；内管采用符合GB/T14975(EN10216、ASTM A312)标准的316材质的不锈钢管，规格为外径28mm*壁厚1.05mm；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
(2)对外管进行酸磷皂
按照正常冷拔无缝钢管生产工艺，将外管放置在13％的盐酸溶液中，去除表皮的氧化皮和锈蚀层；然后把外管放入浓度为6％体积百分比的磷化液中，并添加1.5‰的促进剂进行中间磷化；最后，再把外管放入到皂化液中进行表面润滑；磷化液为磷酸、氧化锌、硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一种；促进剂为纯碱、硝酸钠中的任意一种；皂化液为纯碱、硬脂酸、石蜡中的任意一种；
(3)对内管的内表面进行润滑处理
由于内管为不锈钢钢管，采用不锈钢管的润滑工艺，即在钢管的内壁涂抹牛油和石灰的混合物，注意涂抹必须要均匀，并用低于100℃的烘干机，将涂抹牛油石灰的不锈钢管烘干；牛油为锂基脂，石灰为熟石灰；牛油和石灰的质量比为牛油：石灰为1.5：10；
(4)在内管的外表面包覆镍基钎料，镍基钎料的厚度为0.04mm，包覆方法为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、网状结构或粉状结构；
(5)内外管进行套管
待将外管放置好后，同时将内管推放到外管内孔中；注意，如果内外管壁碰到一起，且无法推进时，不应用力强行套管；
(6)对上述套管后的内外管进行缩头加工
把已经套在一起的内外管的一端放入到缩头机中进行缩头操作，注意在此操作中必须把内管也要缩头进去；
(7)拉拔加工
根据内外管的尺寸选择20T的拉拔机，选择合适的外模，并安装苏式内模，按照正常的无缝冷拔钢管工艺进行拉拔；
(8)对拉拔加工后的内外管切头尾定尺
(9)然后进行中间清洗操作
中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入直至从另一头流出；
(10)热处理工艺
将内外管放置在还原性气体中在750℃的连续加热炉中加工，且持续2小时，再通过炉胆冷却出炉；
(11)矫直处理
根据成品钢管的直径(25mm)调整主、被动矫辊间的距离和几何角度，几何角度以成品钢管和矫辊的接触面最大为准，同时把成品钢管(外径25mm*壁厚2.5mm)在矫直机主被动矫辊之间调成直线；
(12)水压检验，保压10秒，压力20MPa；
(13)半成品清洗
半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出；
(14)泡防锈水并沥干
在半成品清洗之后，将不锈钢复合管放入到浓度为5％的防锈水中，直到气泡全部从钢管端口出尽，并在浸泡过程中翻动钢管至少一次；然后，把成品钢管吊到倾斜的料架上，直至端口水不再滴出；
(15)包装入库待发
把沥干的不锈钢复合管拉进包装区，先用缠绕膜，再用编制袋对钢管包装，并在两端和当中用钢带打包扎紧，再由质检填写合格证后，吊运到代发货区准备发货。
本发明制造出的复合钢管的导热系数为25，结合力为240MPa。
实施例3
一种不锈钢复合管的制造方法，不锈钢复合管的内管为不锈钢钢管、外管为碳钢管，通过在不锈钢钢管的外表面包覆铝基钎料，再通过连续加热炉热处理将铝基钎料与内、外管紧密的聚合起来，该制造方法的具体步骤如下：
(1)准备不锈钢复合管内外管原材料
外管采用符合GB/T8163(EN10210、ASTM A106)标准要求的碳钢管，规格为外径35mm*壁厚1.6mm；内管采用符合GB/T14975(EN10216、ASTM A312)标准的316材质的不锈钢管，规格为外径28mm*壁厚1.05mm；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
(2)对外管进行酸磷皂
按照正常冷拔无缝钢管生产工艺，将外管放置在14％的盐酸溶液中，去除表皮的氧化皮和锈蚀层；然后把外管放入浓度为7％体积百分比的磷化液中，并添加2‰的促进剂进行中间磷化；最后，再把外管放入到皂化液中进行表面润滑；磷化液为磷酸、氧化锌、硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一种；促进剂为纯碱、硝酸钠中的任意一种；皂化液为纯碱、硬脂酸、石蜡中的 任意一种；
(3)对内管的内表面进行润滑处理
由于内管为不锈钢钢管，采用不锈钢管的润滑工艺，即在钢管的内壁涂抹牛油和石灰的混合物，注意涂抹必须要均匀，并用低于100℃的烘干机，将涂抹牛油石灰的不锈钢管烘干；牛油为锂基脂，石灰为熟石灰；牛油和石灰的质量比为牛油：石灰为1.5：12；
(4)在内管的外表面包覆铝基钎料，铝基钎料的厚度为0.05mm，包覆方法为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、网状结构或粉状结构；
(5)内外管进行套管
待将外管放置好后，同时将内管推放到外管内孔中；注意，如果内外管壁碰到一起，且无法推进时，不应用力强行套管；
(6)对上述套管后的内外管进行缩头加工
把已经套在一起的内外管的一端放入到缩头机中进行缩头操作，注意在此操作中必须把内管也要缩头进去；
(7)拉拔加工
根据内外管的尺寸选择20T的拉拔机，选择合适的外模，并安装苏式内模，按照正常的无缝冷拔钢管工艺进行拉拔；
(8)对拉拔加工后的内外管切头尾定尺
(9)然后进行中间清洗操作
中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入直至从另一头流出；
(10)热处理工艺
将内外管放置在还原性气体中在850℃的连续加热炉中加工，且持续2.5小时，再通过炉胆冷却出炉；
(11)矫直处理
根据成品钢管的直径(25mm)调整主、被动矫辊间的距离和几何角度，几何角度以成品钢管和矫辊的接触面最大为准，同时把成品钢管(外径25mm*壁厚 2.5mm)在矫直机主被动矫辊之间调成直线；
(12)水压检验，保压10秒，压力20MPa；
(13)半成品清洗
半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出；
(14)泡防锈水并沥干
在半成品清洗之后，将不锈钢复合管放入到浓度为5％的防锈水中，直到气泡全部从钢管端口出尽，并在浸泡过程中翻动钢管至少一次；然后，把成品钢管吊到倾斜的料架上，直至端口水不再滴出；
(15)包装入库待发
把沥干的不锈钢复合管拉进包装区，先用缠绕膜，再用编制袋对钢管包装，并在两端和当中用钢带打包扎紧，再由质检填写合格证后，吊运到代发货区准备发货。
本发明制造出的复合钢管的导热系数为26，结合力为250MPa。
实施例4
一种不锈钢复合管的制造方法，不锈钢复合管的内管为不锈钢钢管、外管为碳钢管，通过在不锈钢钢管的外表面包覆银基钎料，再通过连续加热炉热处理将银基钎料与内、外管紧密的聚合起来，该制造方法的具体步骤如下：
(1)准备不锈钢复合管内外管原材料
外管采用符合GB/T8163(EN10210、ASTM A106)标准要求的碳钢管，规格为外径35mm*壁厚1.6mm；内管采用符合GB/T14975(EN10216、ASTM A312)标准的316材质的不锈钢管，规格为外径28mm*壁厚1.05mm；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
(2)对外管进行酸磷皂
按照正常冷拔无缝钢管生产工艺，将外管放置在15％的盐酸溶液中，去除表皮的氧化皮和锈蚀层；然后把外管放入浓度为7％体积百分比的磷化液中，并添加2‰的促进剂进行中间磷化；最后，再把外管放入到皂化液中进行表面润滑；磷化液为磷酸、氧化锌、硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一 种；促进剂为纯碱、硝酸钠中的任意一种；皂化液为纯碱、硬脂酸、石蜡中的任意一种；
(3)对内管的内表面进行润滑处理
由于内管为不锈钢钢管，采用不锈钢管的润滑工艺，即在钢管的内壁涂抹牛油和石灰的混合物，注意涂抹必须要均匀，并用低于100℃的烘干机，将涂抹牛油石灰的不锈钢管烘干；牛油为锂基脂，石灰为熟石灰；牛油和石灰的质量比为牛油：石灰为1.5：15；
(4)在内管的外表面包覆银基钎料，银基钎料的厚度为0.05mm，包覆方法为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、网状结构或粉状结构；
(5)内外管进行套管
待将外管放置好后，同时将内管推放到外管内孔中；注意，如果内外管壁碰到一起，且无法推进时，不应用力强行套管；
(6)对上述套管后的内外管进行缩头加工
把已经套在一起的内外管的一端放入到缩头机中进行缩头操作，注意在此操作中必须把内管也要缩头进去；
(7)拉拔加工
根据内外管的尺寸选择20T的拉拔机，选择合适的外模，并安装苏式内模，按照正常的无缝冷拔钢管工艺进行拉拔；
(8)对拉拔加工后的内外管切头尾定尺
(9)然后进行中间清洗操作
中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入直至从另一头流出；
(10)热处理工艺
将内外管放置在还原性气体中在1000℃的连续加热炉中加工，且持续2.5小时，再通过炉胆冷却出炉；
(11)矫直处理
根据成品钢管的直径(25mm)调整主、被动矫辊间的距离和几何角度，几 何角度以成品钢管和矫辊的接触面最大为准，同时把成品钢管(外径25mm*壁厚2.5mm)在矫直机主被动矫辊之间调成直线；
(12)水压检验，保压10秒，压力20MPa；
(13)半成品清洗
半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出；
(14)泡防锈水并沥干
在半成品清洗之后，将不锈钢复合管放入到浓度为5％的防锈水中，直到气泡全部从钢管端口出尽，并在浸泡过程中翻动钢管至少一次；然后，把成品钢管吊到倾斜的料架上，直至端口水不再滴出；
(15)包装入库待发
把沥干的不锈钢复合管拉进包装区，先用缠绕膜，再用编制袋对钢管包装，并在两端和当中用钢带打包扎紧，再由质检填写合格证后，吊运到代发货区准备发货。
本发明制造出的复合钢管的导热系数为28，结合力为260MPa。
实施例5
一种不锈钢复合管的制造方法，不锈钢复合管的内管为碳钢管、外管为不锈钢钢管，通过在碳钢管的外表面包覆铜基钎料，再通过连续加热炉热处理将铜基钎料层与内、外管紧密的聚合起来，该制造方法的具体步骤如下：
(1)准备不锈钢复合管内外管原材料
内管采用符合GB/T8163(EN10210、ASTM A106)标准要求的碳钢管，规格为外径35mm*壁厚1.6mm；外管采用符合GB/T14975(EN10216、ASTM A312)标准的316材质的不锈钢管，规格为外径28mm*壁厚1.05mm；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
(2)对内管进行酸磷皂
按照正常冷拔无缝钢管生产工艺，将内管放置在12％的盐酸溶液中，去除表皮的氧化皮和锈蚀层；然后把内管放入浓度为5％体积百分比的磷化液中，并添加1‰的促进剂进行中间磷化；最后，再把内管放入到皂化液中进行表面 润滑；磷化液为磷酸、氧化锌、硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一种；促进剂为纯碱、硝酸钠中的任意一种；皂化液为纯碱、硬脂酸、石蜡中的任意一种；内管酸磷皂完成后两头上封盖，然后再将内管放置在15％的盐酸溶液中，去除表面的化学层；
(3)对外管的内表面进行润滑处理
由于外管为不锈钢钢管，采用不锈钢管的润滑工艺，即在钢管的内壁涂抹牛油和石灰的混合物，注意涂抹必须要均匀，并用低于100℃的烘干机，将涂抹牛油石灰的不锈钢管烘干；牛油为锂基脂，石灰为熟石灰；牛油和石灰的质量比为牛油：石灰为1.5：6；
(4)在内管的外表面包覆铜基钎料，青铜基钎料的厚度为0.02mm，包覆方法为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、网状结构或粉状结构；
(5)内外管进行套管
待将外管放置好后，同时将内管推放到外管内孔中；注意，如果内外管壁碰到一起，且无法推进时，不应用力强行套管；
(6)对上述套管后的内外管进行缩头加工
把已经套在一起的内外管的一端放入到缩头机中进行缩头操作，注意在此操作中必须把内管也要缩头进去；
(7)拉拔加工
根据内外管的尺寸选择20T的拉拔机，选择合适的外模，并安装苏式内模，按照正常的无缝冷拔钢管工艺进行拉拔；
(8)对拉拔加工后的内外管切头尾定尺
(9)然后进行中间清洗操作
中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入直至从另一头流出；
(10)热处理工艺
将内外管放置在还原性气体中在650℃的连续加热炉中加工，且持续1.5小时，再通过炉胆冷却出炉；
(11)矫直处理
根据成品钢管的直径(25mm)调整主、被动矫辊间的距离和几何角度，几何角度以成品钢管和矫辊的接触面最大为准，同时把成品钢管(外径25mm*壁厚2.5mm)在矫直机主被动矫辊之间调成直线；
(12)水压检验，保压10秒，压力20MPa；
(13)半成品清洗
半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出；
(14)泡防锈水并沥干
在半成品清洗之后，将不锈钢复合管放入到浓度为5％的防锈水中，直到气泡全部从钢管端口出尽，并在浸泡过程中翻动钢管至少一次；然后，把成品钢管吊到倾斜的料架上，直至端口水不再滴出；
(15)包装入库待发
把沥干的不锈钢复合管拉进包装区，先用缠绕膜，再用编制袋对钢管包装，并在两端和当中用钢带打包扎紧，再由质检填写合格证后，吊运到代发货区准备发货。
本发明制造出的复合钢管的导热系数为24，结合力为210MPa。
实施例6
一种不锈钢复合管的制造方法，不锈钢复合管的内管为碳钢管、外管为不锈钢钢管，通过在不锈钢钢管的外表面包覆镍基钎料，再通过连续加热炉热处理将镍基钎料与内、外管紧密的聚合起来，该制造方法的具体步骤如下：
(1)准备不锈钢复合管内外管原材料
内管采用符合GB/T8163(EN10210、ASTM A106)标准要求的碳钢管，规格为外径35mm*壁厚1.6mm；外管采用符合GB/T14975(EN10216、ASTM A312)标准的316材质的不锈钢管，规格为外径28mm*壁厚1.05mm；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
(2)对内管进行酸磷皂
按照正常冷拔无缝钢管生产工艺，将内管放置在13％的盐酸溶液中，去 除表皮的氧化皮和锈蚀层；然后把内管放入浓度为6％体积百分比的磷化液中，并添加1.5‰的促进剂进行中间磷化；最后，再把内管放入到皂化液中进行表面润滑；磷化液为磷酸、氧化锌、硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一种；促进剂为纯碱、硝酸钠中的任意一种；皂化液为纯碱、硬脂酸、石蜡中的任意一种；内管酸磷皂完成后两头上封盖，然后再将内管放置在15％的盐酸溶液中，去除表面的化学层；
(3)对外管的内表面进行润滑处理
由于外管为不锈钢钢管，采用不锈钢管的润滑工艺，即在钢管的内壁涂抹牛油和石灰的混合物，注意涂抹必须要均匀，并用低于100℃的烘干机，将涂抹牛油石灰的不锈钢管烘干；牛油为锂基脂，石灰为熟石灰；牛油和石灰的质量比为牛油：石灰为1.5：10；
(4)在内管的外表面包覆镍基钎料，镍基钎料的厚度为0.04mm，包覆方法为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、网状结构或粉状结构；
(5)内外管进行套管
待将外管放置好后，同时将内管推放到外管内孔中；注意如果内外管壁碰到一起，且无法推进时，不应用力强行套管；
(6)对上述套管后的内外管进行缩头加工
把已经套在一起的内外管的一端放入到缩头机中进行缩头操作，注意在此操作中必须把内管也要缩头进去；
(7)拉拔加工
根据内外管的尺寸选择20T的拉拔机，选择合适的外模，并安装苏式内模，按照正常的无缝冷拔钢管工艺进行拉拔；
(8)对拉拔加工后的内外管切头尾定尺
(9)然后进行中间清洗操作
中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入直至从另一头流出；
(10)热处理工艺
将内外管放置在还原性气体中在750℃的连续加热炉中加工，且持续2小时，再通过炉胆冷却出炉；
(11)矫直处理
根据成品钢管的直径(25mm)调整主、被动矫辊间的距离和几何角度，几何角度以成品钢管和矫辊的接触面最大为准，同时把成品钢管(外径25mm*壁厚2.5mm)在矫直机主被动矫辊之间调成直线；
(12)水压检验，保压10秒，压力20MPa；
(13)半成品清洗
半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出；
(14)泡防锈水并沥干
在半成品清洗之后，将不锈钢复合管放入到浓度为5％的防锈水中，直到气泡全部从钢管端口出尽，并在浸泡过程中翻动钢管至少一次；然后，把成品钢管吊到倾斜的料架上，直至端口水不再滴出；
(15)包装入库待发
把沥干的不锈钢复合管拉进包装区，先用缠绕膜，再用编制袋对钢管包装，并在两端和当中用钢带打包扎紧，再由质检填写合格证后，吊运到代发货区准备发货。
本发明制造出的复合钢管的导热系数为25，结合力为240MPa。
实施例7
一种不锈钢复合管的制造方法，不锈钢复合管的内管为碳钢管、外管为不锈钢钢管，通过在碳钢管的外表面包覆铝基钎料，再通过连续加热炉热处理将铝基钎料与内、外管紧密的聚合起来，该制造方法的具体步骤如下：
(1)准备不锈钢复合管内外管原材料
内管采用符合GB/T8163(EN10210、ASTM A106)标准要求的碳钢管，规格为外径35mm*壁厚1.6mm；外管采用符合GB/T14975(EN10216、ASTM A312)标准的316材质的不锈钢管，规格为外径28mm*壁厚1.05mm；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
(2)对内管进行酸磷皂
按照正常冷拔无缝钢管生产工艺，将内管放置在14％的盐酸溶液中，去除表皮的氧化皮和锈蚀层；然后把内管放入浓度为7％体积百分比的磷化液中，并添加2‰的促进剂进行中间磷化；最后，再把内管放入到皂化液中进行表面润滑；磷化液为磷酸、氧化锌、硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一种；促进剂为纯碱、硝酸钠中的任意一种；皂化液为纯碱、硬脂酸、石蜡中的任意一种；内管酸磷皂完成后两头上封盖，然后再将内管放置在15％的盐酸溶液中，去除表面的化学层；
(3)对外管的内表面进行润滑处理
由于外管为不锈钢钢管，采用不锈钢管的润滑工艺，即在钢管的内壁涂抹牛油和石灰的混合物，注意涂抹必须要均匀，并用低于100℃的烘干机，将涂抹牛油石灰的不锈钢管烘干；牛油为锂基脂，石灰为熟石灰；牛油和石灰的质量比为牛油：石灰为1.5：12；
(4)在内管的外表面包覆铝基钎料，铝基钎料的厚度为0.05mm，包覆方法为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、网状结构或粉状结构；
(5)内外管进行套管
待将外管放置好后，同时将内管推放到外管内孔中；注意如果内外管壁碰到一起，且无法推进时，不应用力强行套管；
(6)对上述套管后的内外管进行缩头加工
把已经套在一起的内外管的一端放入到缩头机中进行缩头操作，注意在此操作中必须把内管也要缩头进去；
(7)拉拔加工
根据内外管的尺寸选择20T的拉拔机，选择合适的外模，并安装苏式内模，按照正常的无缝冷拔钢管工艺进行拉拔；
(8)对拉拔加工后的内外管切头尾定尺
(9)然后进行中间清洗操作
中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入 直至从另一头流出；
(10)热处理工艺
将内外管放置在还原性气体中在850℃的连续加热炉中加工，且持续2.5小时，再通过炉胆冷却出炉；
(11)矫直处理
根据成品钢管的直径(25mm)调整主、被动矫辊间的距离和几何角度，几何角度以成品钢管和矫辊的接触面最大为准，同时把成品钢管(外径25mm*壁厚2.5mm)在矫直机主被动矫辊之间调成直线；
(12)水压检验，保压10秒，压力20MPa；
(13)半成品清洗
半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出；
(14)泡防锈水并沥干
在半成品清洗之后，将不锈钢复合管放入到浓度为5％的防锈水中，直到气泡全部从钢管端口出尽，并在浸泡过程中翻动钢管至少一次；然后，把成品钢管吊到倾斜的料架上，直至端口水不再滴出；
(15)包装入库待发
把沥干的不锈钢复合管拉进包装区，先用缠绕膜，再用编制袋对钢管包装，并在两端和当中用钢带打包扎紧，再由质检填写合格证后，吊运到代发货区准备发货。
本发明制造出的复合钢管的导热系数为26，结合力为250MPa。
实施例8
一种不锈钢复合管的制造方法，不锈钢复合管的内管为碳钢管、外管为不锈钢钢管，通过在碳钢管的外表面包覆银基钎料，再通过连续加热炉热处理将银基钎料与内、外管紧密的聚合起来，该制造方法的具体步骤如下：
(1)准备不锈钢复合管内外管原材料
内管采用符合GB/T8163(EN10210、ASTM A106)标准要求的碳钢管，规格为外径35mm*壁厚1.6mm；外管采用符合GB/T14975(EN10216、ASTM A312)标 准的316材质的不锈钢管，规格为外径28mm*壁厚1.05mm；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
(2)对内管进行酸磷皂
按照正常冷拔无缝钢管生产工艺，将内管放置在15％的盐酸溶液中，去除表皮的氧化皮和锈蚀层；然后把内管放入浓度为7％体积百分比的磷化液中，并添加2‰的促进剂进行中间磷化；最后，再把内管放入到皂化液中进行表面润滑；磷化液为磷酸、氧化锌、硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一种；促进剂为纯碱、硝酸钠中的任意一种；皂化液为纯碱、硬脂酸、石蜡中的任意一种；内管酸磷皂完成后两头上封盖，然后再将内管放置在15％的盐酸溶液中，去除表面的化学层；
(3)对外管的内表面进行润滑处理
由于外管为不锈钢钢管，采用不锈钢管的润滑工艺，即在钢管的内壁涂抹牛油和石灰的混合物，注意涂抹必须要均匀，并用低于100℃的烘干机，将涂抹牛油石灰的不锈钢管烘干；牛油为锂基脂，石灰为熟石灰；牛油和石灰的质量比为牛油：石灰为1.5：15；
(4)在内管的外表面包覆银基钎料，银基钎料的厚度为0.05mm，包覆方法为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、网状结构或粉状结构；
(5)内外管进行套管
待将外管放置好后，同时将内管推放到外管内孔中；注意如果内外管壁碰到一起，且无法推进时，不应用力强行套管；
(6)对上述套管后的内外管进行缩头加工
把已经套在一起的内外管的一端放入到缩头机中进行缩头操作，注意在此操作中必须把内管也要缩头进去；
(7)拉拔加工
根据内外管的尺寸选择20T的拉拔机，选择合适的外模，并安装苏式内模，按照正常的无缝冷拔钢管工艺进行拉拔；
(8)对拉拔加工后的内外管切头尾定尺
(9)然后进行中间清洗操作
中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入直至从另一头流出；
(10)热处理工艺
将内外管放置在还原性气体中在1000℃的连续加热炉中加工，且持续2.5小时，再通过炉胆冷却出炉；
(11)矫直处理
根据成品钢管的直径(25mm)调整主、被动矫辊间的距离和几何角度，几何角度以成品钢管和矫辊的接触面最大为准，同时把成品钢管(外径25mm*壁厚2.5mm)在矫直机主被动矫辊之间调成直线；
(12)水压检验，保压10秒，压力20MPa；
(13)半成品清洗
半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出；
(14)泡防锈水并沥干
在半成品清洗之后，将不锈钢复合管放入到浓度为5％的防锈水中，直到气泡全部从钢管端口出尽，并在浸泡过程中翻动钢管至少一次；然后，把成品钢管吊到倾斜的料架上，直至端口水不再滴出；
(15)包装入库待发
把沥干的不锈钢复合管拉进包装区，先用缠绕膜，再用编制袋对钢管包装，并在两端和当中用钢带打包扎紧，再由质检填写合格证后，吊运到代发货区准备发货。
本发明制造出的复合钢管的导热系数为28，结合力为260MPa。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。

Claims (10)

  1. 一种不锈钢复合管的制造方法，其特征在于，所述制造方法的具体步骤如下：
    (1)准备不锈钢复合管内外管原材料
    外管采用碳钢管，内管采用不锈钢管；内外管之间预先保留1-5mm的间隙；同时内外管的直线度要求确保不大于1.5mm/m；
    (2)对外管进行润滑处理
    按照正常冷拔无缝钢管生产工艺，将外管放置在12-15％的盐酸溶液中，去除表皮的氧化皮和锈蚀层；然后把外管放入浓度为5％-7％体积百分比的磷化液中，并添加1-2‰的促进剂进行中间磷化；最后，再把外管放入到皂化液中进行表面润滑；
    (3)对内管的内表面进行润滑处理
    在内管的内壁涂抹润滑油，并在低于100℃下干燥；
    (4)在内管的外表面包覆聚合层；
    (5)内外管进行套管
    待将外管放置好后，同时将内管推放到外管内孔中；内外管壁碰到一起，且无法推进时，不应用力强行套管；
    (6)对上述套管后的内外管进行缩头加工；
    (7)拉拔加工；
    (8)对拉拔加工后的内外管切头尾定尺；
    (9)然后进行中间清洗操作；
    (10)热处理工艺
    将内外管放置在保护气氛中在650-1000℃的连续加热炉中加工，且持续1.5-2.5小时，再通过炉胆冷却出炉；
    (11)矫直处理；
    (12)水压检验；
    (13)半成品清洗；
    (14)泡防锈水并沥干。
  2. 根据权利要求1所述的一种不锈钢复合管的制造方法，其特征在于，所述步骤(2)中的磷化液为磷酸、氧化锌、硝酸锌、硝酸钙、硝酸镍、柠檬酸中的任意一种；所述促进剂为纯碱、硝酸钠中的任意一种；所述皂化液为纯碱、硬脂酸、石蜡中的任意一种。
  3. 根据权利要求1所述的一种不锈钢复合管的制造方法，其特征在于，所述步骤(3)中的牛油为锂基脂，所述石灰为熟石灰；所述牛油和石灰的质量比为牛油：石灰为1.5：6-15。
  4. 根据权利要求1所述的一种不锈钢复合管的制造方法，其特征在于，所述步骤(4)中聚合层的厚度为0.01-0.1mm。
  5. 根据权利要求1所述的一种不锈钢复合管的制造方法，其特征在于，所述步骤(4)中聚合层的厚度为0.02-0.05mm。结合强度的性价比最高。
  6. 根据权利要求1所述的一种不锈钢复合管的制造方法，其特征在于，所述步骤(4)中聚合层为青铜箔、铜基钎料、镍基钎料、铝基钎料、银基钎料中的任意一种。
  7. 根据权利要求1所述的一种不锈钢复合管的制造方法，其特征在于，所述步骤(4)中聚合层的包覆具体为纵向包覆、螺旋缠绕包覆或铺洒包覆，其形成的聚合层分别为薄皮状结构、丝状结构、粉状结构、膏体或其中几种的混合物。
  8. 根据权利要求1所述的一种不锈钢复合管的制造方法，其特征在于，所述步骤(9)中的中间清洗是将定尺好的内外管放入到温度为65℃以上的脱脂剂中浸泡30分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从钢管一端冲入直至从另一头流出。
  9. 根据权利要求1所述的一种不锈钢复合管的制造方法，其特征在于，所述步骤(13)中的半成品清洗是将通过水压检测的不锈钢复合管放入到温度为65℃以上的脱脂剂中浸泡15分钟以上，然后放入到清水缸中，用压力大于0.5MPa的清水从不锈钢复合管一端冲入直至从另一头流出。
  10. 根据权利要求1所述的一种不锈钢复合管的制造方法，其特征在于，所述步骤(10)中的保护气氛为还原性气体。
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