CN108868007A - A kind of composite screw thread steel and preparation method thereof - Google Patents
A kind of composite screw thread steel and preparation method thereof Download PDFInfo
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- CN108868007A CN108868007A CN201810770699.8A CN201810770699A CN108868007A CN 108868007 A CN108868007 A CN 108868007A CN 201810770699 A CN201810770699 A CN 201810770699A CN 108868007 A CN108868007 A CN 108868007A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/006—Making ferrous alloys compositions used for making ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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Abstract
The present invention relates to field of iron and steel smelting, a kind of composite screw thread steel and preparation method thereof is provided, for solving the etching problem of screw-thread steel.A kind of composite screw thread steel provided by the invention and preparation method thereof, including steel core and alloy-layer, the alloy-layer wrap up steel core, and for the steel core with alloy-layer metallurgical bonding, the alloy layer thickness is 1 ~ 3mm.A upper laminated layer gold is covered on the surface of steel core, steel core can be effectively protected from corrosion in alloy-layer, and steel core, by metallurgical bonding, connects firm with alloy-layer.
Description
Technical field
The present invention relates to field of iron and steel smelting, and in particular to a kind of composite screw thread steel and preparation method thereof.
Background technique
The production cost of stainless steel is continuously improved as noble metal nickel consumes, therefore seeks both resistance to stainless steel rebar
Corrosive nature, but it is target that people urgently pursue that low in cost, intensity, which is also higher than the material of stainless steel rebar,.It is mild steel, low
The cost of steel alloy is low, intensity is high, and stainless steel has excellent corrosion resistance, by mild steel or low-alloy steel with it is corrosion resistant
Alloy is compound to prepare bimetal, has important meaning for the service life for improving construction engineering quality, extending building structure
Justice.
CN107023119A discloses a kind of stainless steel composite anticorrosive Ribbed Bar and its manufacturing method, have core,
Intermediate alloy layer and stainless steel surface layer are constituted；The core material is low-alloy steel, and intermediate alloy layer material is nickel-base alloy
Or acid bronze alloy, stainless steel watch layer material are stainless steel.The invention passes through one layer of stainless steel surface layer compound on common steel
Improve the Corrosion Protection of steel, but its compound surface layer is common screw-thread steel, anticorrosion ability is general.Improve anticorrosion
Effect is composite screw thread steel/reinforcing bar technical problem urgently to be resolved.
Summary of the invention
Present invention solves the technical problem that being the etching problem of screw-thread steel, a kind of composite screw thread steel and its preparation side are provided
Method.
In order to solve the above technical problem, the present invention provides technical solution be：
A kind of composite screw thread steel and preparation method thereof, including steel core and alloy-layer, the alloy-layer wrap up steel core, the steel
For core with alloy-layer metallurgical bonding, the alloy layer thickness is 1 ~ 3mm.
A upper laminated layer gold is covered on the surface of steel core, steel core can be effectively protected from corrosion in alloy-layer, and steel core is the same as conjunction
Layer gold is connected firm by metallurgical bonding.
The thickness of alloy-layer is smaller, can effectively save the cost, while alloy-layer can be the stainless steel being modified,
Anticorrosion effect further increases.
Preferably, the steel core is mild steel.Mild steel can further reduce the cost.
Preferably, the manufacturing method of the alloy-layer is：It successively include electric furnace smelting, external refining, continuous casting working procedure, institute
In the electric furnace smelting process stated, the pig iron, zinc ingot metal, copper ingot congruent melting are stirred, silicon is added during smelting to external refining in circuit
Iron and manganeisen, are added ferrophosphorus in external refining process, 900 ~ 1000 mass parts of the pig iron, and the carbon dust 0.3 ~
1.2 mass parts, 3 ~ 5 mass parts of zinc ingot metal, 0.1 ~ 0.4 mass parts of copper ingot, 0.3 ~ 0.5 mass of ferrophosphorus
Part, 0.9 ~ 1.3 mass parts of manganeisen.
C is intensified element most basic in steel, and C content is every to increase by 0.01%, the tensile strength increase about 10MPa of steel；Mn
It is mainly used for increasing steel strength, while reduces S in ore and damaging；The toughness and corrosion resistance of steel can be improved in Zn, Cu, passes through
Above-mentioned material, which smelts steel alloy out, efficient corrosion resistant effect.
Preferably, 950 ~ 1000 mass parts of the pig iron, 0.9 ~ 1.2 mass parts of carbon dust, the zinc ingot metal 4 ~ 5
Mass parts, 0.3 ~ 0.4 mass parts of copper ingot, 0.4 ~ 0.5 mass parts of ferrophosphorus, 1 ~ 1.3 mass of manganeisen
Part.
Preferably, 950 mass parts of the pig iron, 0.9 mass parts of carbon dust, 4 mass parts of zinc ingot metal are described
0.3 mass parts of copper ingot, 0.4 mass parts of ferrophosphorus, 1 mass parts of manganeisen.The amount of ferrophosphorus excessively will affect steel
The mechanical property of material,；The content of phosphorus is 15 ~ 20% in ferrophosphorus, the content 72 ~ 80% of Silicon in Ferrosilicon, the content of manganese in manganeisen
It is 36 ~ 40%.
Preferably, the Zn is modified Zn；The method of modifying of the modification zinc ingot metal is：Intermediate alloy is prepared, zinc is taken
81 ~ 90 mass parts of ingot, 3 ~ 6 mass parts of calcium metal, under protection of argon gas congruent melting are blown into argon gas when temperature reaches 650 ~ 710 DEG C
Stirring, ar pressure are 0.02 ~ 0.04MPa, and temperature drops to 500 ~ 550 DEG C, obtains intermediate alloy liquid；Modification liquid is prepared, is taken
Aluminium ingot is melted to liquid at 800 ~ 1200 DEG C by 70 ~ 75 mass parts of aluminium ingot, 2 ~ 5 mass parts of silicon, 0.05 ~ 0.1 mass parts of rare earth
State adds rare earth, obtains modification liquid after being sufficiently stirred after silicon melting is added；By the same modification liquid of 50 ~ 60 mass parts of intermediate alloy
After the mixing of 10 ~ 20 mass parts, it is passed through nitrogen gas stirring, nitrogen pressure is 0.05 ~ 0.2MPa, and cooling, casting obtains modified Zn.
A small amount of calcium metal is added in zinc ingot metal, can effectively improve the anticorrosion effect of intermediate alloy；And the addition of silicon
So that the wearability of alloy-layer and the effect of high temperature corrosion further increase；Intermediate alloy and modification liquid mixing are fluid origin
Modified Zn can effectively enhance it to the modified effect in steel class alloy, especially improve the anticorrosion ability of alloy.
Preferably, the rare earth is mainly the ore of monazite or bastnaesite.Rare earth is for improving silicon in aluminium
Dispersion effect in liquid.
Preferably, the silicon is logical oxygen metallic silicon.Oxygen 553# metallic silicon can be gated.
Preferably, the method for modifying of the modified Zn is：Intermediate alloy is prepared, 85 ~ 90 mass parts of zinc ingot metal, calcium metal are taken
4 ~ 6 mass parts, congruent melting under protection of argon gas, when temperature reaches 680 ~ 710 DEG C, be blown into argon gas stirring, ar pressure be 0.03 ~
0.04MPa, temperature drop to 540 ~ 550 DEG C, obtain intermediate alloy liquid；Modification liquid is prepared, 72 ~ 75 mass parts of aluminium ingot, silicon 3 ~ 5 are taken
Aluminium ingot is melted to liquid by mass parts, 0.08 ~ 0.1 mass parts of rare earth at 1000 ~ 1200 DEG C, after silicon melting is added, is added
Rare earth obtains modification liquid after being sufficiently stirred；After 55 ~ 60 mass parts of intermediate alloy are mixed with 15 ~ 20 mass parts of modification liquid, it is passed through
Nitrogen gas stirring, nitrogen pressure is 0.1 ~ 0.2MPa, cooling, and casting obtains modified Zn.
Preferably, the method for modifying of the modified Zn is：Intermediate alloy is prepared, 85 mass parts of zinc ingot metal, 4 matter of calcium metal are taken
Part is measured, congruent melting under protection of argon gas is blown into argon gas and stirs when temperature reaches 680 DEG C, ar pressure 0.03MPa, at a temperature of
540 DEG C are dropped to, intermediate alloy liquid is obtained；Modification liquid is prepared, takes 72 mass parts of aluminium ingot, 3 mass parts of silicon, 0.08 mass parts of rare earth,
Aluminium ingot is melted to liquid at 1000 DEG C, after silicon melting is added, rare earth is added, obtains modification liquid after being sufficiently stirred；Will in
Between 55 mass parts of alloy with the mixing of 15 mass parts of modification liquid after, be passed through nitrogen gas stirring, nitrogen pressure 0.1MPa is cooling, casting,
Obtain modified Zn.
Under molten condition, intermediate alloy and modification liquid are mixed, is passed through nitrogen gas stirring, mixed metal liquid occurs anti-with nitrogen
It answers, nitrogen is introduced in molten system, can further improve the anticorrosion effect of alloy.
A kind of composite screw thread steel preparation method, includes the following steps：（1）, described alloy-layer be cast into steel tubular, it is described
Alloy-layer internal diameter be more than or equal to steel core outer diameter；（2）, described alloy-layer after oil removal treatment, pass through plasma spraying
Mode uniformly spray middle layer powder in the inner surface of alloy-layer；（3）, the steel core be placed into handled through step 2
In the hole in the middle part of alloy-layer crossed, the then soldering by way of arc welding by the gap at the two both ends obtains compound embryo material；
（4）, the compound embryo material is heated to 1000 ~ 1100 DEG C, the fusing of middle layer powder obtains compound spiral shell after rolling, tube reducing
Line steel.
Oil removing can prevent impurity inside screw-thread steel excessive, and alloy-layer is with steel core by the thawing of middle layer powder to smelting
Gold connection, middle layer powder is evenly distributed in the inner surface of alloy-layer by way of plasma spraying so that alloy-layer and
The connection of steel core is more closely.
Preferably, the middle layer powder is Ni-based middle layer powder；The Ni-based middle layer powder includes：Ni：
60 ~ 70 mass parts, Cr：10 ~ 12 mass parts, B：4 ~ 6 mass parts, Cu：1 ~ 2 mass parts.The fusing point of Ni-based middle layer powder is lower.
Compared with prior art, the device have the advantages that being：A upper laminated layer gold, alloy are covered on the surface of steel core
Steel core can be effectively protected from corrosion in layer, and steel core, by metallurgical bonding, connects firm with alloy-layer；The thickness of alloy-layer compared with
It is small, can effectively save the cost, while alloy-layer can be the stainless steel being modified, and anticorrosion effect further increases.
Specific embodiment
Following implementation column is to further explanation of the invention, is not limitation of the present invention.
Embodiment 1
A kind of composite screw thread steel and preparation method thereof, including steel core and alloy-layer, the alloy-layer wrap up steel core, the steel
For core with alloy-layer metallurgical bonding, the alloy layer thickness is 3mm.The steel core is mild steel.950 mass of the pig iron
Part, 0.9 mass parts of carbon dust, 4 mass parts of zinc ingot metal, 0.3 mass parts of copper ingot, 0.4 matter of ferrophosphorus
Measure part, 1 mass parts of manganeisen.Intermediate alloy is prepared, 85 mass parts of zinc ingot metal are taken, 4 mass parts of calcium metal are protected in argon gas
Lower congruent melting is blown into argon gas stirring when temperature reaches 680 DEG C, and ar pressure 0.03MPa, temperature drops to 540 DEG C, obtains
Intermediate alloy liquid；Modification liquid is prepared, 72 mass parts of aluminium ingot, 3 mass parts of silicon, 0.08 mass parts of rare earth, by aluminium ingot at 1000 DEG C are taken
Under be melted to liquid, after silicon melting is added, adds rare earth, obtain modification liquid after being sufficiently stirred；By 55 mass parts of intermediate alloy
After the mixing of 15 mass parts of modification liquid, it is passed through nitrogen gas stirring, nitrogen pressure 0.1MPa is cooling, and casting obtains modified Zn.
A upper laminated layer gold is covered on the surface of steel core, steel core can be effectively protected from corrosion in alloy-layer, and steel core is the same as conjunction
Layer gold is connected firm by metallurgical bonding.
The thickness of alloy-layer is smaller, can effectively save the cost, while alloy-layer can be the stainless steel being modified,
Anticorrosion effect further increases.Mild steel can further reduce the cost.
A small amount of calcium metal is added in zinc ingot metal, can effectively improve the anticorrosion effect of intermediate alloy；And the addition of silicon
So that the wearability of alloy-layer and the effect of high temperature corrosion further increase；Intermediate alloy and modification liquid mixing are fluid origin
Modified Zn can effectively enhance the modified effect in its steel class alloy, especially improve the anticorrosion ability of alloy.Molten condition
Under, intermediate alloy and modification liquid are mixed, is passed through nitrogen gas stirring, mixed metal liquid reacts with nitrogen, draws in molten system
Enter nitrogen, can further improve the anticorrosion effect of alloy.
A kind of composite screw thread steel preparation method, includes the following steps：（1）, described alloy-layer be cast into steel tubular, it is described
Alloy-layer internal diameter be more than or equal to steel core outer diameter；（2）, described alloy-layer after oil removal treatment, pass through plasma spraying
Mode uniformly spray middle layer powder in the inner surface of alloy-layer；（3）, the steel core be placed into handled through step 2
In the hole in the middle part of alloy-layer crossed, the then soldering by way of arc welding by the gap at the two both ends obtains compound embryo material；
（4）, the compound embryo material is heated to 1000 DEG C, the fusing of middle layer powder obtains composite screw thread steel after rolling, tube reducing.
The middle layer powder is Ni-based middle layer powder；The Ni-based middle layer powder includes：Ni：60 mass parts, Cr：10 matter
Measure part, B：4 mass parts, Cu：1 mass parts.
Oil removing can prevent impurity inside screw-thread steel excessive, and alloy-layer is with steel core by the thawing of middle layer powder to smelting
Gold connection, middle layer powder is evenly distributed in the inner surface of alloy-layer by way of plasma spraying so that alloy-layer and
The connection of steel core is more closely.The fusing point of Ni-based middle layer powder is lower.
Embodiment 2
Embodiment 2 with embodiment 1 the difference is that, the alloy layer thickness be 1mm, the manufacturing method of the alloy-layer
For：It include successively electric furnace smelting, external refining, continuous casting working procedure, it is in the electric furnace smelting process, the pig iron, zinc ingot metal, copper ingot is total
Molten stirring, circuit are added ferrosilicon and manganeisen during smelting to external refining, ferrophosphorus are added in external refining process,
900 mass parts of the pig iron, 0.3 mass parts of carbon dust, 3 mass parts of zinc ingot metal, 0.1 mass of copper ingot
Part, 0.3 mass parts of ferrophosphorus, 0.9 mass parts of manganeisen.
Embodiment 3
Embodiment 3 with embodiment 1 the difference is that, the manufacturing method of the alloy-layer is：It successively include electric furnace smelting, furnace
Outer refining, continuous casting working procedure in the electric furnace smelting process, the pig iron, zinc ingot metal, copper ingot congruent melting are stirred, circuit is smelted to outside furnace
Ferrosilicon and manganeisen are added during refining, is added ferrophosphorus in external refining process, 1000 mass parts of the pig iron,
1.2 mass parts of carbon dust, 5 mass parts of zinc ingot metal, 0.4 mass parts of copper ingot, 0.5 mass of ferrophosphorus
Part, 1.3 mass parts of manganeisen.
Embodiment 4
Embodiment 4 with embodiment 1 the difference is that, the Zn is modified Zn；The method of modifying of the modification zinc ingot metal is：
Intermediate alloy is prepared, takes 81 mass parts of zinc ingot metal, 3 mass parts of calcium metal, congruent melting under protection of argon gas, when temperature reaches 650 DEG C,
It is blown into argon gas stirring, ar pressure 0.024MPa, temperature drops to 500 DEG C, obtains intermediate alloy liquid；Modification liquid is prepared, is taken
Aluminium ingot is melted to liquid by 70 mass parts of aluminium ingot, 2 mass parts of silicon, 0.05 mass parts of rare earth at 800 DEG C, after silicon melting is added,
Rare earth is added, obtains modification liquid after being sufficiently stirred；After 50 mass parts of intermediate alloy are mixed with 10 mass parts of modification liquid, it is passed through
Nitrogen gas stirring, nitrogen pressure 0.05MPa is cooling, and casting obtains modified Zn.
Embodiment 5
Embodiment 5 with embodiment 1 the difference is that, the Zn is modified Zn；The method of modifying of the modification zinc ingot metal is：
Intermediate alloy is prepared, takes 90 mass parts of zinc ingot metal, 6 mass parts of calcium metal, congruent melting under protection of argon gas, when temperature reaches 710 DEG C,
It is blown into argon gas stirring, ar pressure 0.04MPa, temperature drops to 550 DEG C, obtains intermediate alloy liquid；Modification liquid is prepared, aluminium is taken
Aluminium ingot is melted to liquid by 75 mass parts of ingot, 5 mass parts of silicon, 0.1 mass parts of rare earth at 1200 DEG C, after silicon melting is added, then
Rare earth is added, obtains modification liquid after being sufficiently stirred；After 60 mass parts of intermediate alloy are mixed with 20 mass parts of modification liquid, it is passed through nitrogen
Gas agitating, nitrogen pressure 0.2MPa is cooling, and casting obtains modified Zn.
Embodiment 6
Embodiment 6 with embodiment 1 the difference is that, include the following steps：（1）, described alloy-layer be cast into steel tubular, institute
The internal diameter for the alloy-layer stated is more than or equal to the outer diameter of steel core；（2）, described alloy-layer after oil removal treatment, pass through plasma spray
The mode of painting uniformly sprays middle layer powder in the inner surface of alloy-layer；（3）, the steel core is placed into through step 2 place
In the hole in the middle part of alloy-layer managed, the then soldering by way of arc welding by the gap at the two both ends obtains compound embryo material；
（4）, the compound embryo material is heated to 1100 DEG C, the fusing of middle layer powder obtains composite screw thread steel after rolling, tube reducing.
The middle layer powder is Ni-based middle layer powder；The Ni-based middle layer powder includes：Ni：70 mass parts, Cr：12 matter
Measure part, B：6 mass parts, Cu：2 mass parts.
Embodiment 7
Embodiment 7 with embodiment 1 the difference is that, the zinc is unmodified.
Embodiment 8
Embodiment 8 with embodiment 1 the difference is that, the modified Zn be free of modification liquid.
Embodiment 9
Embodiment 9 with embodiment 1 the difference is that, when the mixing of the intermediate alloy and modification liquid of the modified Zn, using argon
Gas agitating.
Experimental example
By analyzing the anticorrosion effect of embodiment 1 ~ 9, and then optimal technical scheme.
Corrosion resistance is analyzed by the result of salt spray test, is carried out neutral salt spray test NSS respectively and is measured phase
The tensile strength answered.
1 screw-thread steel corrosion resistance of table and mechanical property
| NSS（g/m2·h） | Tensile strength（MPa） | |
| Embodiment 1 | 0.762 | 644 |
| Embodiment 2 | 0.952 | 565 |
| Embodiment 3 | 0.736 | 572 |
| Embodiment 4 | 0.712 | 623 |
| Embodiment 5 | 0.869 | 596 |
| Embodiment 6 | 0.779 | 562 |
| Embodiment 7 | 1.783 | 535 |
| Embodiment 8 | 1.692 | 523 |
| Embodiment 9 | 1.259 | 561 |
Embodiment 1 ~ 6 is all made of modified Zn as screw-thread steel and prepares raw material, it can be seen that the corrosion resistance of embodiment 1 ~ 6 is aobvious
It writes and is better than embodiment 7 ~ 9, show modified Zn to the remarkable effect for improving screw-thread steel effect.Preparation side of the invention is used simultaneously
The intensity of method, screw-thread steel does not change, and the field of application is not restricted because of the change of preparation method.
Embodiment 1 is that preferably embodiment, anticorrosion effect are significantly better than embodiment 7 in embodiment 1 ~ 6, simultaneously
Tensile strength slightly rises compared with embodiment 7, shows and adds calcium and aluminium, silicon in modified zinc to the corrosion resistant for improving screw-thread steel
Erosion ability has obvious action；In embodiment 4 and 5 during zinc modification, the additive amount of various raw materials is different, embodiment 4
Additive amount is relatively low, causes its corrosion resistance poor compared with embodiment 1 and 5, but still is significantly better than embodiment 7 ~ 9, implements
The various raw material additive amounts of example 5 are higher, but its anticorrosion effect is not better than embodiment 1, while higher cost significantly, because
This embodiment 1 is more preferably embodiment.
Embodiment 2 and 3 is mainly in smelting process, and influence of the different material dosage to screw thread steel mechanical property can be with
Find out that the anticorrosion effect of embodiment 2 and 3 difference compared with embodiment 1 is little, the effect of embodiment 2 is poor, and mainly it is each
Kind raw material dosage is less；The anticorrosion effect of embodiment 3 significantly due to embodiment 1, does not show excessive increase raw material,
The constantly improve of anticorrosion effect can't be brought.
Modified Zn is not added in embodiment 7, corrosion resistance is poor, and further illustrate zinc modification in the present invention must
The property wanted；It is not added with modification liquid in embodiment 8, i.e., the modified Zn alloy that is mainly zinc and calcium, anticorrosion effect have compared with embodiment 7
It is improved, but limited extent；Embodiment 9 does not use nitrogen gas stirring before casting, and embodiment 9 is compared with embodiment 7, corrosion resistance
Promotion it is more significant, show that intermediate alloy and modification liquid play more crucial effect to the raising of anticorrosion effect.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and above embodiments are not to limit this
The scope of the patents of invention, all equivalence enforcements or change without departing from carried out by the present invention, is intended to be limited solely by the scope of the patents of this case.
Claims (10)
1. a kind of composite screw thread steel, which is characterized in that including steel core and alloy-layer, the alloy-layer wraps up steel core, described
For steel core with alloy-layer metallurgical bonding, the alloy layer thickness is 1 ~ 3mm.
2. a kind of composite screw thread steel according to claim 1, which is characterized in that the steel core is mild steel.
3. a kind of composite screw thread steel according to claim 1, which is characterized in that the manufacturing method of the alloy-layer is：
It include successively electric furnace smelting, external refining, continuous casting working procedure, in the electric furnace smelting process, by the pig iron, zinc ingot metal, copper ingot congruent melting
Stirring, circuit are added ferrosilicon and manganeisen during smelting to external refining, ferrophosphorus, institute are added in external refining process
900 ~ 1000 mass parts of the pig iron stated, 0.3 ~ 1.2 mass parts of carbon dust, 3 ~ 5 mass parts of zinc ingot metal, the copper ingot
0.1 ~ 0.4 mass parts, 0.3 ~ 0.5 mass parts of ferrophosphorus, 0.9 ~ 1.3 mass parts of manganeisen.
4. a kind of composite screw thread steel according to claim 3, which is characterized in that 950 ~ 1000 mass parts of the pig iron,
0.9 ~ 1.2 mass parts of carbon dust, 4 ~ 5 mass parts of zinc ingot metal, 0.3 ~ 0.4 mass parts of copper ingot, the phosphorus
0.4 ~ 0.5 mass parts of iron, 1 ~ 1.3 mass parts of manganeisen.
5. a kind of composite screw thread steel according to claim 4, which is characterized in that 950 mass parts of the pig iron, it is described
0.9 mass parts of carbon dust, 4 mass parts of zinc ingot metal, 0.3 mass parts of copper ingot, 0.4 mass parts of ferrophosphorus are described
1 mass parts of manganeisen.
6. a kind of composite screw thread steel according to claim 1, which is characterized in that the zinc ingot metal is modified zinc ingot metal；It is described
The method of modifying of modification zinc ingot metal be：Intermediate alloy is prepared, 81 ~ 90 mass parts of zinc ingot metal, 3 ~ 6 mass parts of calcium metal, in argon gas are taken
Lower congruent melting is protected, when temperature reaches 650 ~ 710 DEG C, is blown into argon gas stirring, ar pressure is 0.02 ~ 0.04MPa, temperature decline
To 500 ~ 550 DEG C, intermediate alloy liquid is obtained；Modification liquid is prepared, takes 70 ~ 75 mass parts of aluminium ingot, 2 ~ 5 mass parts of silicon, rare earth 0.05 ~
Aluminium ingot is melted to liquid by 0.1 mass parts at 800 ~ 1200 DEG C, after silicon melting is added, adds rare earth, after being sufficiently stirred
To modification liquid；After 50 ~ 60 mass parts of intermediate alloy are mixed with 10 ~ 20 mass parts of modification liquid, it is passed through nitrogen gas stirring, nitrogen pressure
Cooling for 0.05 ~ 0.2MPa, casting obtains modified Zn.
7. a kind of composite screw thread steel according to claim 1, which is characterized in that the method for modifying of the modification zinc ingot metal
For：Intermediate alloy is prepared, 85 ~ 90 mass parts of zinc ingot metal, 4 ~ 6 mass parts of calcium metal, congruent melting under protection of argon gas, when temperature reaches are taken
At 680 ~ 710 DEG C, it is blown into argon gas stirring, ar pressure is 0.03 ~ 0.04MPa, and temperature drops to 540 ~ 550 DEG C, obtains centre
Aluminium alloy；Modification liquid is prepared, 72 ~ 75 mass parts of aluminium ingot, 3 ~ 5 mass parts of silicon are taken, 0.08 ~ 0.1 mass parts of rare earth exist aluminium ingot
It is melted to liquid at 1000 ~ 1200 DEG C, after silicon melting is added, adds rare earth, obtains modification liquid after being sufficiently stirred；Centre is closed
After golden 55 ~ 60 mass parts are with the mixing of 15 ~ 20 mass parts of modification liquid, it is passed through nitrogen gas stirring, nitrogen pressure is 0.1 ~ 0.2MPa, cold
But, it casts, obtains modified Zn.
8. a kind of composite screw thread steel according to claim 1, which is characterized in that the method for modifying of the modification zinc ingot metal
For：Intermediate alloy is prepared, 85 mass parts of zinc ingot metal, 4 mass parts of calcium metal, congruent melting under protection of argon gas, when temperature reaches 680 DEG C are taken
When, it is blown into argon gas stirring, ar pressure 0.03MPa, temperature drops to 540 DEG C, obtains intermediate alloy liquid；Modification liquid is prepared,
72 mass parts of aluminium ingot, 3 mass parts of silicon are taken, aluminium ingot is melted to liquid by 0.08 mass parts of rare earth at 1000 DEG C, and silicon melting is added
Afterwards, rare earth is added, obtains modification liquid after being sufficiently stirred；After 55 mass parts of intermediate alloy are mixed with 15 mass parts of modification liquid,
It is passed through nitrogen gas stirring, nitrogen pressure 0.1MPa is cooling, and casting obtains modified Zn.
9. a kind of composite screw thread steel preparation method, described in any item composite screw thread steels, feature exist according to claim 1 ~ 8
In including the following steps：（1）, described alloy-layer be cast into steel tubular, the internal diameter of the alloy-layer is more than or equal to steel core
Outer diameter；（2）, described alloy-layer after oil removal treatment, the inner surface by way of plasma spraying in alloy-layer is uniform
Spray middle layer powder；（3）, the steel core is placed into through in the hole in the middle part of the processed alloy-layer of step 2, then by two
The soldering by way of arc welding of the gap at person both ends, obtains compound embryo material；（4）, the compound embryo material is heated to 1000 ~
1100 DEG C, the fusing of middle layer powder obtains composite screw thread steel after rolling, tube reducing.
10. a kind of composite screw thread steel preparation method according to claim 9, which is characterized in that the middle layer powder
For Ni-based middle layer powder；The Ni-based middle layer powder includes：Ni：60 ~ 70 mass parts, Cr：10 ~ 12 mass parts, B：4~6
Mass parts, Cu：1 ~ 2 mass parts.
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