CN103481033B - Manufacturing method for double-metal seamless steel pipe through machining, assembling and extruding - Google Patents

Manufacturing method for double-metal seamless steel pipe through machining, assembling and extruding Download PDF

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Publication number
CN103481033B
CN103481033B CN201310440680.4A CN201310440680A CN103481033B CN 103481033 B CN103481033 B CN 103481033B CN 201310440680 A CN201310440680 A CN 201310440680A CN 103481033 B CN103481033 B CN 103481033B
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metal pipe
pipe
layer metal
seamless steel
extruding
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CN103481033A (en
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王黎晖
宋亚峰
申勇
刘富强
王锦永
周延峰
李仲华
高杰
程小虎
王磊
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Xinxing Ductile Iron Pipes Co Ltd
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Xinxing Ductile Iron Pipes Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture 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

Abstract

The invention discloses a manufacturing method for a double-metal seamless steel pipe through machining, assembling and extruding and relates to the technical field of double-metal seamless steel pipe manufacture. The method includes the following steps: 1) turning the inner surface of an outer layer metal pipe blank and the outer surface of an inner layer metal pipe blank, chamfering the combination face position of two end faces of the machined inner layer metal pipe blank and the machined outer layer metal pipe blank and conducting taper machining on the inner surface of the outer layer metal pipe blank and the outer surface of the inner layer metal pipe blank; 2) conducting pressing assembly on the machined inner layer metal pipe blank and the machined outer layer metal pipe blank to obtain a composite pipe blank; 3) conducting sealing welding and machining on two end faces of the composite pipe blank; 4) conducting hot chambering and hot extrusion on the machined composite pipe blank to obtain an extruded pieced pipe; 5) conducting hot processing, straightening, finishing and checking on the extruded pieced pipe to obtain the double-metal seamless steel pipe. The double-metal seamless steel pipe manufactured through the method is high in binding force between the inner layer metal and the outer layer metal, high in quality, simple in manufacturing process and high in yield and greatly reduces manufacturing cost.

Description

A kind of manufacture method of machining assembling extruding bimetallic seamless steel pipe
Technical field
The present invention relates to bimetallic seamless steel pipe manufacturing technology field.
Background technology
Bimetallic seamless steel pipe refers to that a performance is combined with each other according to particular/special requirement with the different steel grade of value, to meet the high added value tube product of specific use.In some specific industry, due to needs difference, the metal ingredient of steel pipe ectonexine can be different.As anchor pole industry, due to outer layer metal Long contact time water, need to use corrosion resistant stainless steel, and inner layer metal can be ordinary carbon steel.For another example transportation pipe inner layer metal requires high, needs to use anticorrosive, and does not have particular/special requirement to outer layer metal.Can reasonably combined according to different application environmental selection ectonexine metal, can reduce costs again while saving precious metal.Since bimetallic seamless steel pipe in 1991 comes into operation, through the development of more than ten years, be widely used.
Bimetallic seamless steel pipe can be divided into mechanical compound and the large class of metallurgical compound two according to the complex form of ectonexine.The molding mode cost of machinery compound is low, technique simple, but adhesion is little, and interface belongs to non-diffusing and combines, and easily layering occurs in the case of a high temperature, causes bimetal tube to lose efficacy; The mode of metallurgical compound has higher bond strength, but cost is high, complex manufacturing.Such as, explosive forming composite manufacturing method, the method is mechanical compound, can produce the composite steel tube of various material matching, comprise the compound of light metal and steel, shortcoming to build special blast place or space, there is special safety measure, the bimetallic seamless steel pipe interface district produced easily forms waveform, and adhesion is little, and pipe length is restricted; Spun casting composite manufacturing method, the method is metallurgical compound, the bond strength of each layer metal can be ensured, shortcoming is in high temperature casting process, outer layer metal can partly incorporate in inner layer metal pipe, cause the composition of inner layer metal pipe impure, uncontrollable, defect rate is high, thus causes whole production cost to improve.
Summary of the invention
Technical problem to be solved by this invention is to provide the manufacture method of a kind of machining assembling extruding bimetallic seamless steel pipe, between the ectonexine metal of the bimetallic seamless steel pipe that the method produces, adhesion is strong, and quality is good, and manufacturing process is simple, yield rate is high, greatly reduces manufacturing cost.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of manufacture method of machining assembling extruding bimetallic seamless steel pipe, comprises the following steps:
1) processing of ectonexine metal pipe billet: the ectonexine metal pipe billet choosing two kinds of unlike materials, turning fine finishining is carried out to the inner surface of outer metal pipe billet and the outer surface of inner layer metal pipe, and process ectonexine metal pipe billet both ends of the surface faying face place chamfering, again according to the tapering of 1:100 ~ 1:400, taper WEDM is carried out to outer metal pipe billet inner surface and inner layer metal outer surface of tube blank;
2) the press-in assembling of the ectonexine metal pipe billet processed: adopted by the ectonexine metal pipe billet processed forcing press at room temperature to carry out press-in assembling, inner layer metal pipe is made to be pressed in outer layer metal pipe completely, ectonexine metal pipe billet both ends of the surface are equal, reach interference fit, form composite pipe blank;
3) the both ends of the surface soldering and sealing of composite pipe blank and processing: place carries out soldering and sealing to composite pipe blank both ends of the surface chamfering, forms chamfering weld seam, and fine finishining composite pipe blank inner surface and hot reaming horn mouth;
4) the hot reaming of the composite pipe blank processed, hot extrusion: by the composite pipe blank preheating in annular furnace processed, then in an induction furnace, carry out an eddy-current heating, come out of the stove, carry out high-pressure water descaling, surfaces externally and internally glass dust lubricates, hot reaming, high-pressure water descaling, then secondary eddy-current heating is carried out in secondary induction furnace, come out of the stove, surfaces externally and internally glass dust lubricates, hot extrusion, forms extruding hollow forging;
5) extrude the process of hollow forging: extruding hollow forging is heat-treated, and follow-up aligning, finishing, inspection, obtain bimetallic seamless steel pipe.
Preferably, in step 4), preheat temperature is 800 ~ 950 DEG C, and preheating time is 2 ~ 3h; One time induction heating temperature is 1100 ~ 1200 DEG C; High-pressure water descaling pressure is 15 ~ 23Mpa; Secondary induction heating temperature is 1150 ~ 1250 DEG C; Extrusion speed is 100 ~ 200mm/s.
Preferred further, outer layer metal pipe material is carbon steel, low-alloy steel or steel alloy, and inner layer metal pipe material is high-alloy steel, stainless steel or nickel-base alloy.
Preferably, in step 1), chamfering is: right-angle side length is the chamfering of 20 × 20mm ~ 10 × 10mm; Roughness≤6.3 μm of taper WEDM.
Preferably, step 2) middle interference fit, the monolateral magnitude of interference is 3 ~ 10 μm.
Preferably, after the composite pipe blank processed being carried out hot reaming and high-pressure water descaling in step 4), carry out 1,2,3 or 4 high temperature induction fusion, then carry out secondary eddy-current heating and hot extrusion formation extruding hollow forging.
Further preferably, high temperature induction fusion is: at 1300 DEG C, be incubated 2min, come out of the stove cooling 2 ~ 6min, and afterwards, then repeat above-mentioned high temperature induction fusion operation twice, last high temperature induction fusion operates the cooling 5 ~ 15min that comes out of the stove.
The beneficial effect adopting technique scheme to produce is:
(1) outer layer metal pipe both ends of the surface of the present invention and inner layer metal pipe both ends of the surface faying face place chamfer edge lengths are the chamfering of 20 × 20 ~ 10 × 10mm, and this size chamfering both can ensure weld strength, can play the guiding role again when assembling; Carry out taper WEDM according to the tapering of 1:100 ~ 1:400 to outer metal pipe billet inner surface and inner layer metal outer surface of tube blank, processing tapering is less than 1:400, and assembly difficulty is large, and tapering is greater than 1:100, and interference bonded area is too little, affects bond strength.
(2) adopt room temperature to be pushed down into assembly method, non-stainless steel layer is not oxidized.If fitting surface oxidation can bring detrimental effects to bond strength, reduce bond strength, under serious conditions, binder course there will be layering, and adopt hot charging to join oxidizable non-stainless steel layer surface, simultaneously room temperature press-in assembling need not be heated, and operational sequence simplifies, easy to operate, and cost is low.
(3) interference fit, the monolateral magnitude of interference 3 ~ 10 μm, makes ectonexine corrupt split closely, effectively eliminate the air between double layer of metal, eliminate and vacuumize link, the magnitude of interference is greater than 10 μm, and during assembling, frictional force increases, during forcing press press-in, resistance increases, internal layer is yielding, not easily loads, and the magnitude of interference is less than 3 μm, do not have interference fit effect, ectonexine corrupt split intensity reduces.
(4) chamfering place carries out soldering and sealing, effectively can solve the oxidative phenomena at pipe binder course position when heating.
(5) extrusion process has the feature of three-dimensional stress compression, greatly can play the plastic deformation of metal, between the bimetallic seamless steel pipe ectonexine metal adopting the deformation methods such as cold setting compound materials in the tube+hot reaming, hot extrusion to produce, adhesion is strong, quality is good, and manufacturing process is simple, yield rate is high, and manufacturing cost can reduce by more than 10%.
(6) high temperature induction fusion can make junction ectonexine metal slightly fuse, and strengthens bond strength.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation;
Fig. 1 is structural representation of the present invention;
In figure, 1, outer layer metal pipe; 2, faying face; 3, inner layer metal pipe; 4, chamfering weld seam; 5, hot reaming horn mouth.
Detailed description of the invention
Embodiment 1
Manufacture 42CrMo/304 bimetallic seamless steel pipe, comprise the following steps:
1) processing of ectonexine metal pipe billet: outer layer metal pipe 1 adopts steel alloy 42CrMo, inner layer metal pipe 3 adopts high-alloy steel 304, with horizontal lathe, turning fine finishining is carried out to outer metal pipe billet 1 inner surface and inner layer metal pipe 3 outer surface, and ectonexine metal pipe billet both ends of the surface faying face 2 place chamfer edge lengths is the chamfering of 20 × 20mm, become " V " font, again according to the tapering of 1:400, on horizontal lathe, taper WEDM is carried out to outer metal pipe billet 1 inner surface and inner layer metal pipe 3 outer surface, employing small tool deflects certain angle and two-way tool path pattern is processed, roughness 6.3 μm, for ensureing roughness, adopt rough turn, half finish turning, finish turning technique is processed, finish turning adopts high rotating speed, little bite, the little amount of feeding is processed.
2) the press-in assembling of the ectonexine metal pipe billet processed: adopted by the ectonexine metal pipe billet processed 1000 tons of forcing presses at room temperature to carry out press-in assembling, inner layer metal pipe is made to be pressed in outer layer metal pipe completely, ectonexine metal pipe billet both ends of the surface are equal, reach interference fit, the monolateral magnitude of interference 3 μm, forms composite pipe blank.
3) the both ends of the surface soldering and sealing of composite pipe blank and processing: place carries out soldering and sealing to composite pipe blank both ends of the surface chamfering, form chamfering weld seam 4, and adopt deep hole drilling and boring machine fine finishining composite pipe blank inner surface, ensure that precision is the monolateral magnitude of interference 3 μm, fineness 6.3 μm, adopt numerically controlled lathe, programming Control processes hot reaming horn mouth 5.
4) the hot reaming of the composite pipe blank processed, hot extrusion: by the composite pipe blank preheating in annular furnace processed, then in an induction furnace, carry out an eddy-current heating, come out of the stove, carry out high-pressure water descaling, surfaces externally and internally glass dust lubricates, hot reaming, high-pressure water descaling, then secondary eddy-current heating is carried out in secondary induction furnace, come out of the stove, surfaces externally and internally glass dust lubricates, hot extrusion, forms extruding hollow forging; Described preheat temperature is 950 DEG C, and preheating time is 2.5h; One time induction heating temperature is 1100 DEG C; High-pressure water descaling pressure is 15Mpa; Secondary induction heating temperature is 1200 DEG C; Extrusion speed is 150mm/s.
5) process of hollow forging is extruded: heat-treat in glowing furnace and tempering furnace, 840 DEG C of hardening, 690 ± 10 DEG C of tempering, straightener aligning after heat treatment, after aligning, flexibility is less than 2mm/m, pipe finishing process after aligning, and on request mechanical property, surface quality, dimensions etc. are tested, obtain 42CrMo/304 bimetallic seamless steel pipe, tensile strength is 1100MPa, yield strength 950MPa, percentage elongation 15%.
Embodiment 2
Manufacture L360/825 bimetallic seamless steel pipe, comprise the following steps:
1) processing of ectonexine metal pipe billet: outer layer metal pipe 1 adopts carbon steel L360, inner layer metal pipe 3 adopts nickel-base alloy 825, with horizontal lathe, turning fine finishining is carried out to outer metal pipe billet 1 inner surface and inner layer metal pipe 3 outer surface, and ectonexine metal pipe billet both ends of the surface faying face 2 place chamfer edge lengths is the chamfering of 10 × 10mm, become " V " font, again according to the tapering of 1:250, on horizontal lathe, taper WEDM is carried out to outer metal pipe billet inner surface and inner layer metal outer surface of tube blank, employing small tool deflects certain angle and two-way tool path pattern is processed, roughness 3.2 μm, for ensureing roughness, adopt rough turn, half finish turning, finish turning technique is processed, finish turning adopts high rotating speed, little bite, the little amount of feeding is processed.
2) the press-in assembling of the ectonexine metal pipe billet processed: adopted by the ectonexine metal pipe billet processed 1000 tons of forcing presses at room temperature to carry out press-in assembling, inner layer metal pipe 3 is pressed in outer layer metal pipe 1 completely, ectonexine metal pipe billet both ends of the surface are equal, reach interference fit, the monolateral magnitude of interference 10 μm, forms composite pipe blank.
3) the both ends of the surface soldering and sealing of composite pipe blank and processing: place carries out soldering and sealing to composite pipe blank both ends of the surface chamfering, form chamfering weld seam 4, and adopt deep hole drilling and boring machine fine finishining composite pipe blank inner surface, ensure that precision is the monolateral magnitude of interference 10 μm, fineness 3.2 μm, adopt numerically controlled lathe, programming Control processes hot reaming horn mouth 5.
4) the hot reaming of the composite pipe blank processed, hot extrusion: by the composite pipe blank preheating in annular furnace processed, then in an induction furnace, carry out an eddy-current heating, come out of the stove, carry out high-pressure water descaling, surfaces externally and internally glass dust lubricates, hot reaming, high-pressure water descaling, high temperature induction fusion, in secondary induction furnace, carry out secondary eddy-current heating again, come out of the stove, carry out surfaces externally and internally glass dust lubrication, hot extrusion, forms extruding hollow forging; Described preheat temperature is 850 DEG C, and preheating time is 3h; One time induction heating temperature is 1180 DEG C; High-pressure water descaling pressure is 19Mpa; Secondary induction heating temperature is 1250 DEG C; Extrusion speed is 100mm/s; High temperature induction fusion is: at 1300 DEG C, be incubated 2min, and come out of the stove cooling 6min, is incubated 2min afterwards at 1300 DEG C, and come out of the stove cooling 4min, then be incubated 2min at 1300 DEG C, and come out of the stove cooling 5min.
5) process of hollow forging is extruded: heat-treat in glowing furnace and tempering furnace, 930 ± 10 DEG C of hardening, 630 ± 10 DEG C of tempering, straightener aligning after heat treatment, after aligning, flexibility is less than 2mm/m, pipe finishing process after aligning, and on request mechanical property, surface quality, dimensions etc. are tested, obtain L360/825 bimetallic seamless steel pipe, tensile strength is 545MPa, yield strength 395MPa, percentage elongation 28.6%.
Embodiment 3
Manufacture X70/316L bimetallic seamless steel pipe, comprise the following steps:
1) processing of ectonexine metal pipe billet: outer layer metal pipe 1 adopts low-alloy steel X70, inner layer metal pipe 3 adopts Stainless steel 316 L, with horizontal lathe, turning fine finishining is carried out to outer metal pipe billet 1 inner surface and inner layer metal pipe 3 outer surface, and ectonexine metal pipe billet both ends of the surface faying face place chamfer edge lengths is the chamfering of 15 × 15mm, become " V " font, again according to the tapering of 1:100, on horizontal lathe, taper WEDM is carried out to outer metal pipe billet 1 inner surface and inner layer metal pipe 3 outer surface, employing small tool deflects certain angle and two-way tool path pattern is processed, roughness 2.8 μm, for ensureing roughness, adopt rough turn, half finish turning, finish turning technique is processed, finish turning adopts high rotating speed, little bite, the little amount of feeding is processed.
2) the press-in assembling of the ectonexine metal pipe billet processed: adopted by the ectonexine metal pipe billet processed 1000 tons of forcing presses at room temperature to carry out press-in assembling, inner layer metal pipe 3 is pressed in outer layer metal pipe 1 completely, ectonexine metal pipe billet both ends of the surface are equal, reach interference fit, the monolateral magnitude of interference 7 μm, forms composite pipe blank.
3) the both ends of the surface soldering and sealing of composite pipe blank and processing: place carries out soldering and sealing to composite pipe blank both ends of the surface chamfering, form chamfering weld seam 4, and adopt deep hole drilling and boring machine fine finishining composite pipe blank inner surface, ensure that precision is the monolateral magnitude of interference 7 μm, fineness 2.8 μm, adopt numerically controlled lathe, programming Control processes hot reaming horn mouth 5.
4) the hot reaming of the composite pipe blank processed, hot extrusion: by the composite pipe blank preheating in annular furnace processed, then in an induction furnace, carry out an eddy-current heating, come out of the stove, carry out high-pressure water descaling, surfaces externally and internally glass dust lubricates, hot reaming, high-pressure water descaling, high temperature induction fusion, in secondary induction furnace, carry out secondary eddy-current heating again, come out of the stove, carry out surfaces externally and internally glass dust lubrication, hot extrusion, forms extruding hollow forging; Described preheat temperature is 800 DEG C, and preheating time is 2h; One time induction heating temperature is 1200 DEG C; High-pressure water descaling pressure is 23Mpa; Secondary induction heating temperature is 1150 DEG C; Extrusion speed is 200mm/s; High temperature induction fusion is: at 1300 DEG C, be incubated 2min, and come out of the stove cooling 2min, is incubated 2min afterwards at 1300 DEG C, and come out of the stove cooling 15min.
5) process of hollow forging is extruded: heat-treat in glowing furnace and tempering furnace, 920 ± 20 DEG C of hardening, 620 ± 20 DEG C of tempering, straightener aligning after heat treatment, after aligning, flexibility is less than 2mm/m, pipe finishing process after aligning, and on request mechanical property, surface quality, dimensions etc. are tested, obtain X70/316L bimetallic seamless steel pipe, tensile strength is 653MPa, yield strength 530MPa, percentage elongation 26.3%.

Claims (7)

1. a manufacture method for machining assembling extruding bimetallic seamless steel pipe, is characterized in that, comprise the following steps:
1) processing of ectonexine metal pipe billet: the ectonexine metal pipe billet choosing two kinds of unlike materials, turning fine finishining is carried out to the inner surface of outer metal pipe billet (1) and the outer surface of inner layer metal pipe (3), and process ectonexine metal pipe billet both ends of the surface faying face (2) place chamfering, again according to the tapering of 1:100 ~ 1:400, taper WEDM is carried out to outer metal pipe billet (1) inner surface and inner layer metal pipe (3) outer surface;
2) the press-in assembling of the ectonexine metal pipe billet processed: adopted by the ectonexine metal pipe billet processed forcing press at room temperature to carry out press-in assembling, inner layer metal pipe (3) is pressed in outer layer metal pipe (1) completely, ectonexine metal pipe billet both ends of the surface are equal, reach interference fit, form composite pipe blank;
3) the both ends of the surface soldering and sealing of composite pipe blank and processing: place carries out soldering and sealing to composite pipe blank both ends of the surface chamfering, forms chamfering weld seam (4), and fine finishining composite pipe blank inner surface and hot reaming horn mouth (5);
4) the hot reaming of the composite pipe blank processed, hot extrusion: by the composite pipe blank preheating in annular furnace processed, then in an induction furnace, carry out an eddy-current heating, come out of the stove, carry out high-pressure water descaling, surfaces externally and internally glass dust lubricates, hot reaming, high-pressure water descaling, then secondary eddy-current heating is carried out in secondary induction furnace, come out of the stove, surfaces externally and internally glass dust lubricates, hot extrusion, forms extruding hollow forging;
5) extrude the process of hollow forging: extruding hollow forging is heat-treated, and follow-up aligning, finishing, inspection, obtain bimetallic seamless steel pipe.
2. the manufacture method of a kind of machining assembling extruding bimetallic seamless steel pipe according to claim 1, it is characterized in that in described step 4), preheat temperature is 800 ~ 950 DEG C, preheating time is 2 ~ 3h; One time induction heating temperature is 1100 ~ 1200 DEG C; High-pressure water descaling pressure is 15 ~ 23Mpa; Secondary induction heating temperature is 1150 ~ 1250 DEG C; Extrusion speed is 100 ~ 200mm/s.
3. the manufacture method of a kind of machining assembling extruding bimetallic seamless steel pipe according to claim 2, it is characterized in that described outer layer metal pipe material is carbon steel or steel alloy, inner layer metal pipe material is high-alloy steel, stainless steel or nickel-base alloy.
4. the manufacture method of a kind of machining assembling extruding bimetallic seamless steel pipe according to claim 1, is characterized in that in described step 1), chamfering is: right-angle side length is the chamfering of 20 × 20mm ~ 10 × 10mm; Roughness≤6.3 μm of taper WEDM.
5. the manufacture method of a kind of machining assembling extruding bimetallic seamless steel pipe according to claim 1, is characterized in that described step 2) middle interference fit, the monolateral magnitude of interference is 3 ~ 10 μm.
6. the manufacture method of a kind of machining assembling extruding bimetallic seamless steel pipe as claimed in any of claims 1 to 5, after it is characterized in that, in described step 4), the composite pipe blank processed is carried out hot reaming and high-pressure water descaling, carry out 1,2,3 or 4 high temperature induction fusion, then carry out secondary eddy-current heating and hot extrusion formation extruding hollow forging.
7. the manufacture method of a kind of machining assembling extruding bimetallic seamless steel pipe according to claim 6, it is characterized in that described high temperature induction fusion is: at 1300 DEG C, be incubated 2min, come out of the stove cooling 2 ~ 6min, afterwards, repeat above-mentioned high temperature induction fusion operation twice again, last high temperature induction fusion operates the cooling 5 ~ 15min that comes out of the stove.
CN201310440680.4A 2013-09-25 2013-09-25 Manufacturing method for double-metal seamless steel pipe through machining, assembling and extruding Active CN103481033B (en)

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CN104028957B (en) * 2014-05-19 2016-08-24 新兴铸管股份有限公司 A kind of manufacture method of hot extrusion bimetal composite seamless steel pipe
CN104399773A (en) * 2014-11-27 2015-03-11 中国海洋石油总公司 Processing technology for high-grade steel seamless metallurgical composite pipe
CN111318708A (en) * 2018-12-17 2020-06-23 南京尚吉增材制造研究院有限公司 3D printing manufacturing double-layer composite pipe and microstructure regulating and controlling method thereof
CN110587219A (en) * 2019-10-19 2019-12-20 中国矿业大学 Cladding welding method applied to hydraulic support stand column
CN110919306B (en) * 2019-11-27 2021-09-10 丽水学院 Processing and manufacturing process of core-inlaid bronze turbine blank
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