CN101767282B - Method for making wear-resistant composite tubes in cast iron/carbon steel honeycomb sandwich structure - Google Patents
Method for making wear-resistant composite tubes in cast iron/carbon steel honeycomb sandwich structure Download PDFInfo
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Abstract
The present invention discloses a method for making wear-resistant composite tubes in a cast iron/carbon steel honeycomb sandwich structure. Various wear-resistant metal composite tubes used for delivering powder material or fluid can be produced with the method. The present invention adopts the technical proposal that a three-layer composite tube blank of which the inner layer and the outer layer are carbon steel and the middle layer is high chromium cast iron is cast according to the ingredient and size requirements of the inner and the outer layers of a finished product; the tube blank is deformed by hot rolling, the middle layer is partially broken to form a honeycomb or mosaic structure, the middle layer is inlaid and combined with the inner and the outer layers, and different sizes of composite tube products are obtained; thin walled tubes need to be continuously deformed by cold rolling. The composite tubes have high bonding strength between all layers, and nonuniform boundary texture phenomena are eliminated by an annealing technique. The middle high chromium cast iron layer of the composite tubes is combined with the two layers of carbon steel in a honeycomb or mosaic mode, so the composite tubes have high strength and ductility. The method has the advantages of short technical process, simple operation, no requirement for transforming large equipment and high feasibility.
Description
Technical field
The present invention relates to the short process making method of a kind of cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes, mainly be aimed at the high abrasion metal composite pipe that mass transport is used.
Background technology
Metal composite pipe is by two or more different materials (as various alloys such as carbon steel, stainless steel, copper, aluminium, titanium, nickel), be combined into one by various interconnection techniques, have the advanced composite material (ACM) of layers of material advantage concurrently, compare with traditional single-layer metal pipe, two-layer or multi-layer composite metal pipe can be saved the consumption of valuable alloy on the one hand, also can have good comprehensive performances on the other hand.Metal composite pipe has been widely used in industries such as oil, chemical industry, desalinization, salt manufacturing, nuclear industry, food service industry, water conservancy projects construction.
At present, domestic and international reported multiple tube production technology is more, and the preparation method who relates generally to has: weld compound, rolling compound, composite electroplated, powder metallurgic method and casting composite algorithm etc.Wherein, welding and casting are used for the multiple tube preparation of carbon steel and cast iron composition more.The welding composite algorithm comprises soldering and explosive welding etc., can the bigger multiple tube of production specification, but owing to there is the heat affected area, and layer with layer between the zone of not seam appears easily, influenced its boundary strength.The metal composite pipe that casting method is produced, the bond strength between each layer metal is higher than the former, but the comprehensive mechanical property of as-cast structure is relatively poor.Zhang Guoshang, Gao Yimin, Xing Jiandong, Sun Hongbo is in " centrifugal casting technique and the Interface Control of steel/iron double metal composite ", XI AN JIAOTONG UNIVERSITY Subject Index, 2006 (40): 816～818, in utilize the composite centrifugal casting technique to prepare carbon steel/rich chromium cast iron double metallic composite material cylinder sleeve of drilling pump, determined the technological parameter of composite centrifugal casting, designed the Technology for Heating Processing of ladder-elevating temperature, and internally the tissue and the performance of cover material have been tested.Adopt the bimetallic material transition zone even tissue of this explained hereafter, inside and outside cover has reached firm metallurgical binding.
Summary of the invention
In order to overcome the not high shortcoming of lower, the comprehensive toughness of the complex process, the production efficiency that exist in cast iron/carbon steel composite tube production technology, the invention provides a kind of novel cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes preparation method, can be used for preparing the very high cast iron/carbon steel composite tube of bond strength, and shorten the technological process of production greatly.
Process program of the present invention is as follows: according to the ectonexine composition and the dimensional requirement of finished product, water and cast out internal layer and skin is carbon steel, the three-layer composite pipe base that middle one deck is a rich chromium cast iron; Pipe is carried out hot rolling deformation, make the intermediate layer local fragmentation occur, form " cellular " or " digest the Marseille " structure, inlay with ectonexine and combine, obtain the multiple tube product of different size.
Below in conjunction with the drawings and specific embodiments the present invention is carried out concrete elaboration explanation.
Disclosed multi-layer metal composite plate preparation method among the present invention,
1) preparation cast iron/carbon steel honeycomb sandwich structure spun casting composite pipe blank
1. described spun casting composite pipe blank specification is between Φ 90～Φ 800mm, and wall thickness is 40～100mm;
2. the casting cycle of spun casting composite pipe blank is: water the cast carbon steel layer earlier, the degree of superheat is 50 ℃～100 ℃, and centrifuge speed is 400～600 rev/mins.Treat that the carbon steel layer tentatively solidifies, when the top layer degree of supercooling reaches 20 ℃～100 ℃, pour into second layer rich chromium cast iron liquation, the degree of superheat is 20 ℃～70 ℃, and centrifuge speed is 400～700 rev/mins.After treating that the high chromium cast iron layer top layer is tentatively solidified, when its degree of supercooling is 50 ℃～100 ℃, the outermost carbon steel of casting, the degree of superheat is 20 ℃～50 ℃, and centrifuge speed is 500～800 rev/mins, and until finally solidifying, casting cycle feeds argon gas and protects;
3. 3) diffusion annealing: the composite pipe blank after will casting is heated to 1150 ℃～1200 ℃, and insulation 3～5h slowly cools to room temperature, then to improve the bond strength between each layer.
4. the spun casting composite pipe blank after the annealing need carry out machining respectively to its inner surface and outer surface usually, and the cutting output of inner and outer surface layers is respectively: internal layer is 3～6mm; Skin is 2～4mm;
2) rolling deformation
By hot rolling deformation, it is Φ 50～Φ 650mm that described spun casting composite pipe blank is rolled into specification, and thickness is the thick hot rolling hollow forging of 5～20mm, and rolling temperature is between 1180 ℃～950 ℃; For overall cross-sectional deformation amount less than 25% multiple tube, can be by the hot rolling deformation direct forming of a time;
1. roughing is configured as and the spun casting composite pipe blank is put into heating furnace heats, heating-up temperature is between 1050 ℃～1180 ℃, temperature retention time is 0.5～3h, temperature is controlled between 1180 ℃～950 ℃ during roughing, by the distortion of 1～3 passage, every time cross-sectional deformation amount is 15%～30%, and percentage elongation is 15%～40%, make as-cast structure broken substantially, improve the performance of composite pipe blank;
2. the sandwich layer fragmentation can realize that described thermal straightening is that the composite pipe blank after the roughing can utilize three rollers or four roller straighteners to align by thermal straightening and hot rolling deformation, and the straightening temperature of composite pipe blank is between 900 ℃～700 ℃; Described hot rolling is 2～4 passages subsequently, and every time cross-sectional deformation amount is 20%～40%, and deformation temperature is between 1150 ℃～950 ℃, by distortion, makes ectonexine carbon steel layer generation extensional, and the surface is complete; And fracture or partial fracture take place in the rich chromium cast iron in intermediate layer, with the form of " cellular " or " digest the Marseille ", are coated on wherein by the ectonexine carbon steel;
3. finish rolling distortion
2～8 last passages, every time cross-sectional deformation amount should be 10%～25%, deformation temperature by finish rolling distortion and subsequently pickling, aligning, finishing, can obtain the cast iron/carbon steel honeycomb sandwich structure hot rolling hollow forging of final size between 1180 ℃～850 ℃.
4. cold rolling.
For the multiple tube of finished product thickness less than 3mm, can carry out the hollow forging after the hot rolling cold rolling, to guarantee surface quality and dimensional accuracy.Cold rolling pass deformation is 5%～10%.
3) heat treatment is to described cast iron/carbon steel honeycomb sandwich structure hot rolling hollow forging normalizing and tempering heat treatment, between 950 ℃～980 ℃ of the described normalizing temperatures, temperature retention time is 1～5h, during air cooling to 450 ℃～500 ℃, insulation 2～4h, described temperature is 350 ℃, temperature retention time is 1～3h, air cooling obtains cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes to room temperature.
The invention has the advantages that:
The present invention proposes the short cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes production technology of a kind of simple to operate, flow process.Compare with traditional hot rolling compounding method, avoided rolling before to the welding and the pre-assembling of cleaning, surface treatment and the composite plate blanks of each layer metal tube, simplified production process greatly; Compare with single casting composite algorithm, the present invention has improved the bond strength between each layer of multiple tube, has improved the structure property of multiple tube, has expanded producible tubing specification.
And the present invention is by the control to strand heating process, and near the tissue odds the fused layers that has produced when having eliminated casting spares zone (macro manifestations is " bright band "); Utilize the pyroplastic deformation of moderate finite deformation amount, make high chromium cast iron layer generation fragmentation, form the structure of " cellular " or " digest the Marseille ", combine with inlaying between the ectonexine, make multiple tube integral body have higher intensity and toughness.Simultaneously, the production cycle of this method is shorter relatively, and production efficiency is higher, has great application and promotional value.
Description of drawings:
Fig. 1 is the cross sectional representation of cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes base;
Fig. 2 is the cast iron/shape of carbon steel honeycomb sandwich structure wear-resistant composite tubes base and the schematic diagram of inner alveolate texture;
Fig. 3 is the technological process of production figure of cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes;
The specific embodiment:
The present invention can be used to produce multiple cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes, and concrete embodiment is as follows:
Embodiment 1:
Three layers of cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes that ZG270-500/18Cr/ZG270-500 forms, each layer metal thickness ratio is in its finished product: h
1: h
2: h
3=1: 1: 1, multiple tube finished product external diameter was Φ 650, thickness 20mm.
According to Fig. 3, concrete production stage is as follows:
1) preparation cast iron/carbon steel honeycomb sandwich structure spun casting composite pipe blank
According to shown in Figure 1, adopt the spun casting composite pipe blank of Φ 800 series, thickness is 100mm, outer radius R
3Be 800mm, internal diameter R
iBe 732mm, R
1=672mm, R
2=600mm.According to above-mentioned size, calculate each layer molten steel, the iron liquid weight that need.According to the GB requirement, each component molten steel of melting, iron liquid.
The casting cycle of spun casting composite pipe blank is: the ZG270-500 carbon steel layer of casting earlier, and pouring temperature is 1550 ℃～1570 ℃, centrifuge speed is 500～600 rev/mins.Treat that the carbon steel layer tentatively solidifies, when the top layer degree of supercooling reaches 80 ℃～100 ℃, pour into second layer rich chromium cast iron liquation, pouring temperature is 1370 ℃～1400 ℃, and centrifuge speed is 550～700 rev/mins.After treating that the high chromium cast iron layer top layer is tentatively solidified, when its degree of supercooling is 80 ℃～100 ℃, the outermost carbon steel of casting, pouring temperature is 1530 ℃～1550 ℃, centrifuge speed is 600～800 rev/mins, until finally solidifying.Casting cycle feeds argon gas and protects.
Diffusion annealing: composite blank is heated to 1150 ℃～1200 ℃, and insulation 5h slowly cools to room temperature.
Composite pipe blank after the annealing will carry out machining respectively to its internal layer and skin usually.The cutting output of inner and outer surface layers is respectively: internal layer → 6mm; Skin → 4mm.
2) the spun casting composite pipe blank is put into heating furnace and heat, heating-up temperature is between 1050 ℃～1150 ℃, and temperature retention time is 3h.
3) the spun casting composite pipe blank is carried out the hot rolling of multi-pass, make the cast iron/carbon steel honeycomb sandwich structure hot rolling hollow forging that requires specification, rolling temperature is between 1180 ℃～950 ℃, wherein:
1. roughing.1～2 initial passage cross-sectional deformation amount is 15%～25%, and start rolling temperature is 1150 ℃, and finishing temperature is 950 ℃, makes as-cast structure fully broken.
2. the pipe after the roughing carries out thermal straightening on three-roll unbender, and temperature is 750 ℃～800 ℃ during aligning.
According to Fig. 2,2～3 passages subsequently, the cross-sectional deformation amount is 25%～35%, start rolling temperature is 1150 ℃, and finishing temperature is 950 ℃, the high chromium cast iron layer demutation fragmentation in the middle of making, form the structure of " cellular " or " digest the Marseille ", inlay with ectonexine and combine.
3. 2～5 passages subsequently adopt 10%～15% drafts, and repeat-rolling is until final specification.
4. cut edge.Inhomogeneous part excision with the multiple tube two ends.
4) heat treatment
1. normalizing.950 ℃～980 ℃ of the normalizing temperatures of cast iron/carbon steel honeycomb sandwich structure hot rolling hollow forging, insulation 1.5～2h, air cooling to 480 ℃～500 ℃, insulation 2.5～3h.
2. 350 ℃～400 ℃ tempering, temperature retention time is 2.5～3h, air cooling obtains cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes to room temperature.
Embodiment 2:
Three layers of cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes that ZG270-500/18Cr/ZG270-500 forms, each layer metal thickness ratio is in its finished product: h
1: h
2: h
3=1: 1: 1, multiple tube finished product external diameter was Φ 50, thickness 5mm.
Concrete production stage is as follows:
1) preparation cast iron/carbon steel honeycomb sandwich structure spun casting composite pipe blank
According to shown in Figure 1, adopt the spun casting composite pipe blank of Φ 90 series, thickness is 25mm, outer radius R
3Be 90mm, internal diameter R
iBe 732mm, R
1=672mm, R
2=40mm.According to above-mentioned size, calculate each layer molten steel, the iron liquid weight that need.According to the GB requirement, each component molten steel of melting, iron liquid.
The casting cycle of spun casting composite pipe blank is: the ZG270-500 carbon steel layer of casting earlier, and pouring temperature is 1520 ℃～1550 ℃, and the degree of superheat is 50 ℃～80 ℃, and centrifuge speed is 400～500 rev/mins.Treat that the carbon steel layer tentatively solidifies, when the top layer degree of supercooling reaches 20 ℃～40 ℃, pour into second layer rich chromium cast iron liquation, pouring temperature is 1370 ℃～1400 ℃, and the degree of superheat is 20 ℃～50 ℃, and centrifuge speed is 550～700 rev/mins.After treating that the high chromium cast iron layer top layer is tentatively solidified, when its degree of supercooling is 20 ℃～40 ℃, the outermost carbon steel of casting, pouring temperature is 1520 ℃～1550 ℃, centrifuge speed is 600～800 rev/mins, until finally solidifying.Casting cycle feeds argon gas and protects.
Diffusion annealing: composite blank is heated to 1150 ℃～1200 ℃, and insulation 3h slowly cools to room temperature.
Composite pipe blank after the annealing will carry out machining respectively to its internal layer and skin usually.The cutting output of inner and outer surface layers is respectively: internal layer → 3mm; Skin → 2mm.
2) the spun casting composite pipe blank is put into heating furnace and heat, heating-up temperature is between 1050 ℃～1150 ℃, and temperature retention time is 0.5～1h.
3) the spun casting composite pipe blank is carried out the hot rolling of multi-pass, make the cast iron/carbon steel honeycomb sandwich structure hot rolling hollow forging that requires specification, rolling temperature is between 1150 ℃～950 ℃, wherein:
1. roughing.1～2 initial passage cross-sectional deformation amount is 15%～25%, and start rolling temperature is 1150 ℃, and finishing temperature is 950 ℃, makes as-cast structure fully broken.
2. the pipe after the roughing carries out thermal straightening on three-roll unbender, and temperature is 750 ℃～800 ℃ during aligning.
2～3 passages subsequently, the cross-sectional deformation amount is 25%～35%, and start rolling temperature is 1150 ℃, and finishing temperature is 950 ℃, makes middle high chromium cast iron layer demutation fragmentation, forms the structure of " cellular " or " digest the Marseille ", inlays with ectonexine to combine.
3. 2～5 passages subsequently adopt 10%～15% drafts, and repeat-rolling is until final specification.
4. cut edge.Inhomogeneous part excision with the multiple tube two ends.
4) heat treatment
1. normalizing.950 ℃～980 ℃ of the normalizing temperatures of cast iron/carbon steel honeycomb sandwich structure hot rolling hollow forging, insulation 1～1.5h, air cooling to 480 ℃～500 ℃, insulation 2～2.5h.
2. 350 ℃～400 ℃ tempering, temperature retention time is 1～1.5h, air cooling obtains cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes to room temperature.
Embodiment 3:
Three layers of cast iron/carbon steel composite tube that 45# steel/18Cr/45# steel is formed, each layer metal thickness ratio is in its finished product: h
1: h
2: h
3=1: 1: 1, multiple tube finished product external diameter was Φ 100, thickness 4mm.
Concrete production stage is as follows:
1) the centrifugal blank of casting.
Adopt the centrifugal strand of Φ 260 series, thickness is 30mm, outer radius R
3Be 130mm, internal diameter R
iBe 100mm, R
1=120mm, R
2=113mm.According to above-mentioned size, calculate each layer molten steel, the iron liquid weight that need.According to the GB requirement, each component molten steel of melting, iron liquid.
The casting cycle of composite pipe blank is: the 45# steel layer of casting earlier, and pouring temperature is 1540 ℃～1590 ℃, and the degree of superheat is 40 ℃～90 ℃, and centrifuge speed is 400～600 rev/mins.Treat that the carbon steel layer tentatively solidifies, when the top layer degree of supercooling reaches 30 ℃～90 ℃, pour into second layer rich chromium cast iron liquation, pouring temperature is 1370 ℃～1400 ℃, and centrifuge speed is 450～700 rev/mins.After treating that the high chromium cast iron layer top layer is tentatively solidified, when its degree of supercooling is 30 ℃～90 ℃, the outermost carbon steel of casting, pouring temperature is 1540 ℃～1570 ℃, centrifuge speed is 500～800 rev/mins, until finally solidifying.Casting cycle feeds argon gas and protects.
Diffusion annealing: composite blank is heated to 1150 ℃～1170 ℃, and insulation 3.5h slowly cools to room temperature.
Composite pipe blank after the annealing will carry out machining respectively to its internal layer and skin usually.The cutting output of inner and outer surface layers is respectively: internal layer → 6mm; Skin → 3mm.
2) hot rolling.
Composite pipe blank is put into heating furnace heat, heating-up temperature is between 1050 ℃～1150 ℃, and temperature retention time is 1.5～3h.
Pipe is carried out the hot rolling of multi-pass, make the multiple tube that requires specification, rolling temperature is between 1150 ℃～950 ℃, wherein:
1. roughing.1～2 initial passage cross-sectional deformation amount is 15%～25%, and rolling temperature makes as-cast structure fully broken at 1150 ℃～950 ℃.
2. the pipe after the roughing carries out thermal straightening on three-roll unbender, and temperature is 700 ℃～800 ℃ during aligning.2～3 passages subsequently, the cross-sectional deformation amount is 25%～35%, rolling temperature is 1150 ℃～950 ℃, makes middle high chromium cast iron layer demutation fragmentation, forms the structure of " cellular " or " digest the Marseille ", inlays with ectonexine to combine.
3. 2～8 passages subsequently adopt 10%～15% drafts, and repeat-rolling is until final specification.
4. cut edge.Inhomogeneous part excision with the multiple tube two ends.
3) cold rolling.Cold roller and deformed through 3～5 passages obtains final specification, and every time deflection is 5%～10%.
4) heat treatment
1. normalizing.950 ℃～980 ℃ of normalizing temperatures, insulation 0.5～2h, air cooling to 480 ℃～500 ℃, insulation 2.5～3h.
2. 350 ℃～400 ℃ tempering, temperature retention time is 1～3h, air cooling is to room temperature.
Embodiment 4:
Three layers of cast iron/carbon steel composite tube that 20# steel/18Cr/20# steel is formed, each layer metal thickness ratio is in its finished product: h
1: h
2: h
3=1: 1: 1, multiple tube finished product external diameter was Φ 100, thickness 12mm.
Concrete production stage is as follows:
1) the centrifugal blank of casting.
Adopt the centrifugal strand of Φ 260 series, thickness is 30mm, outer radius R
3Be 130mm, internal diameter R
iBe 100mm, R
1=120mm, R
2=113mm.According to above-mentioned size, calculate each layer molten steel, the iron liquid weight that need.According to the GB requirement, each component molten steel of melting, iron liquid.
The casting cycle of composite pipe blank is: the 20# steel layer of casting earlier, and pouring temperature is 1570 ℃～1620 ℃, centrifuge speed is 400～600 rev/mins.Treat that the carbon steel layer tentatively solidifies, when the top layer degree of supercooling reaches 20 ℃～100 ℃, pour into second layer rich chromium cast iron liquation, pouring temperature is 1370 ℃～1400 ℃, and centrifuge speed is 450～700 rev/mins.After treating that the high chromium cast iron layer top layer is tentatively solidified, when its degree of supercooling is 20 ℃～100 ℃, the outermost 20# steel of casting, pouring temperature is 1570 ℃～1600 ℃, centrifuge speed is 500～800 rev/mins, until finally solidifying.Casting cycle feeds argon gas and protects.
Diffusion annealing: composite blank is heated to 1150 ℃～1200 ℃, and insulation 3.5h slowly cools to room temperature.
Composite pipe blank after the annealing will carry out machining respectively to its internal layer and skin usually.The cutting output of inner and outer surface layers is respectively: internal layer → 6mm; Skin → 3mm.
2) hot rolling deformation and heat treatment can be with reference to embodiment 1.
Embodiment 4:
Three layers of cast iron/carbon steel composite tube that Q235 steel/18Cr/Q235 steel is formed, each layer metal thickness ratio is in its finished product: h
1: h
2: h
3=1: 1: 1, multiple tube finished product external diameter was Φ 100, thickness 12mm.
Concrete production stage is as follows:
1) the centrifugal blank of casting.
Adopt the centrifugal strand of Φ 260 series, thickness is 30mm, outer radius R
3Be 130mm, internal diameter R
iBe 100mm, R
1=120mm, R
2=113mm.According to above-mentioned size, calculate each layer molten steel, the iron liquid weight that need.According to the GB requirement, each component molten steel of melting, iron liquid.
The casting cycle of composite pipe blank is: the Q235 steel layer of casting earlier, and pouring temperature is 1550 ℃～1600 ℃, centrifuge speed is 400～600 rev/mins.Treat that the carbon steel layer tentatively solidifies, when the top layer degree of supercooling reaches 20 ℃～100 ℃, pour into second layer rich chromium cast iron liquation, pouring temperature is 1370 ℃～1400 ℃, and centrifuge speed is 450～700 rev/mins.After treating that the high chromium cast iron layer top layer is tentatively solidified, when its degree of supercooling is 20 ℃～100 ℃, the outermost Q235 steel of casting, pouring temperature is 1550 ℃～1580 ℃, centrifuge speed is 500～800 rev/mins, until finally solidifying.Casting cycle feeds argon gas and protects.
Diffusion annealing: composite blank is heated to 1150 ℃～1200 ℃, and insulation 3.5h slowly cools to room temperature.
Composite pipe blank after the annealing will carry out machining respectively to its internal layer and skin usually.The cutting output of inner and outer surface layers is respectively: internal layer → 6mm; Skin → 3mm.
2) hot rolling deformation and heat treatment can be with reference to embodiment 1.
Claims (2)
1. the preparation method of cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes, its production technology is:
1) preparation cast iron/carbon steel honeycomb sandwich structure spun casting composite pipe blank
1. described spun casting composite pipe blank specification is between Ф 90～Ф 800mm, and wall thickness is 25～100mm;
2. the casting cycle of spun casting composite pipe blank is: water the cast carbon steel layer earlier, the degree of superheat is 50 ℃～100 ℃, and centrifuge speed is 400～600 rev/mins; Treat that the carbon steel layer tentatively solidifies, when the top layer degree of supercooling reaches 20 ℃～100 ℃, pour into second layer rich chromium cast iron liquation, the degree of superheat is 20 ℃～70 ℃, centrifuge speed is 400～700 rev/mins, after treating that the high chromium cast iron layer top layer is tentatively solidified, when its degree of supercooling is 50 ℃～100 ℃, the outermost carbon steel of casting, the degree of superheat is 20 ℃～50 ℃, centrifuge speed is 500～800 rev/mins, and until finally solidifying, casting cycle feeds argon gas and protects;
3. diffusion annealing: the spun casting composite pipe blank is heated to 1150 ℃～1200 ℃, and insulation 3～5h slowly cools to room temperature then, to improve the bond strength between each layer, eliminates casting residual stress simultaneously fully;
4. the spun casting composite pipe blank after the annealing need carry out machining respectively to its endosexine and extexine, and the cutting output on inside and outside top layer is respectively: the endosexine is 3～6mm; Extexine is 2～4mm;
2) rolling deformation
By hot rolling deformation, it is Ф 50～Ф 650mm that described spun casting composite pipe blank is rolled into specification, and thickness is the thick hot rolling hollow forging of 5～20mm, and rolling temperature is between 1180 ℃～950 ℃;
1. roughing is shaped: the spun casting composite pipe blank is put into heating furnace heat, heating-up temperature is between 1050 ℃～1180 ℃, temperature retention time is 0.5～3h, temperature is controlled between 1180 ℃～950 ℃ during roughing, by the distortion of 1～3 passage, every time cross-sectional deformation amount is 15%～30%, and percentage elongation is 15%～40%, make as-cast structure broken substantially, improve the performance of composite pipe blank;
2. the sandwich layer fragmentation realizes that by thermal straightening and hot rolling deformation described thermal straightening is that the composite pipe blank after the roughing utilizes three rollers or four roller straighteners to align, and the straightening temperature of composite pipe blank is between 900 ℃～700 ℃; Described hot rolling deformation is 2～4 passages subsequently, and every time cross-sectional deformation amount is 20%～40%, and deformation temperature is between 1150 ℃～950 ℃, by distortion, makes ectonexine carbon steel layer generation extensional, and the surface is complete; And fracture or partial fracture take place in the rich chromium cast iron in intermediate layer, with the form of " cellular " or " digest the Marseille ", are coated on wherein by inside and outside layer carbon steel;
3. finish rolling distortion
2～8 last passages, every time cross-sectional deformation amount should be 10%～25%, deformation temperature is between 1180 ℃～850 ℃, by finish rolling distortion and subsequently pickling, aligning, finishing, obtains the cast iron/carbon steel honeycomb sandwich structure hot rolling hollow forging of final size;
3) heat treatment: to described cast iron/carbon steel honeycomb sandwich structure hot rolling hollow forging normalizing and tempering heat treatment, the normalizing temperature of described normalizing is between 950 ℃～980 ℃, temperature retention time is 1～5h, during air cooling to 450 ℃～500 ℃, insulation 2～4h, the temperature of described tempering is 350 ℃, temperature retention time is 1～3h, air cooling obtains cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes to room temperature.
2. the preparation method of cast iron according to claim 1/carbon steel honeycomb sandwich structure wear-resistant composite tubes, it is characterized in that: described cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes thickness is during less than 3mm, it is 5%～10% that described cast iron/carbon steel honeycomb sandwich structure wear-resistant composite tubes is carried out cold rolling, cold rolling pass deformation.
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| CN102489531A (en) * | 2011-12-19 | 2012-06-13 | 昆明理工大学 | Method for preparing laminated composite metal material through semi-solid rolling after centrifugal compositing |
| CN102553962A (en) * | 2012-01-30 | 2012-07-11 | 新兴铸管股份有限公司 | Rolling forming method for centrifugal casting composite pipe |
| CN102677791B (en) * | 2012-05-22 | 2014-02-05 | 哈尔滨工程大学 | Honeycomb type thin-walled tube buffer structure |
| CN102688887B (en) * | 2012-06-13 | 2014-09-17 | 新兴铸管股份有限公司 | Concrete pump pipe and method for producing metallurgy composite bimetallic concrete pump pipe by diagonal rolling technology |
| CN104148437A (en) * | 2014-06-29 | 2014-11-19 | 柳州美纳机械有限公司 | Production method of double-metal composite pipe |
| CN105798268B (en) * | 2016-03-25 | 2018-05-01 | 杨洪彬 | Bimetallic hybrid engine cylinder body and preparation method thereof |
| CN106944606A (en) * | 2017-04-05 | 2017-07-14 | 哈尔滨理工大学 | It is a kind of to utilize the apparatus and method for inlaying casting preparation large scale alloy functionally gradient material (FGM) |
| CN110814320A (en) * | 2019-09-27 | 2020-02-21 | 中国电器科学研究院股份有限公司 | Casting method of tubular heat exchanger and tubular heat exchanger |
| CN113941748B (en) * | 2021-10-14 | 2023-03-21 | 南京雷尔伟新技术股份有限公司 | Brazing aluminum honeycomb forming and welding method |
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2009
- 2009-06-15 CN CN2009101478325A patent/CN101767282B/en not_active Expired - Fee Related
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