CN105525223A - Production process for super-plastic steel and iron material for large-diameter hexagon bolt - Google Patents

Production process for super-plastic steel and iron material for large-diameter hexagon bolt Download PDF

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Publication number
CN105525223A
CN105525223A CN201511003654.0A CN201511003654A CN105525223A CN 105525223 A CN105525223 A CN 105525223A CN 201511003654 A CN201511003654 A CN 201511003654A CN 105525223 A CN105525223 A CN 105525223A
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alloy steel
percent
steel material
hexagon bolt
production process
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邓之强
王斯华
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DONGGUAN KELEE STEEL WIRE Co Ltd
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DONGGUAN KELEE STEEL WIRE Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • C21D1/32Soft annealing, e.g. spheroidising
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/002Heat treatment of ferrous alloys containing Cr
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C22/00Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2201/00Treatment for obtaining particular effects
    • C21D2201/02Superplasticity

Abstract

The invention discloses a production process for a super-plastic steel and iron material for a large-diameter hexagon bolt. The production process comprises the following steps: (1) material selection: selecting an alloy steel material, the chemical composition of which comprises, by mass percent, 0.34 to 0.37 percent of C, 0.16 to 0.34 percent of Si, 0.61 to 0.89 percent of Mn, 0.015 to 0.025 percent of P, 0.010 to 0.020 percent of S, 0.91 to 1.19 percent of Cr, 0.16 to 0.29 percent of Mo and the balance Fe; (2) spheroidization annealing: putting the alloy steel material in an atmosphere protection furnace, adding a protective atmosphere into the atmosphere protection furnace, heating until an austenite region is stabilized, performing heat preservation for 4 to 6 hours, then slowly cooling to temperature which is 20 to 30 DEG C lower than austenite transformation temperature by 10 DEG C/h, performing heat preservation for 3 to 4 hours, and then cooling with furnace until the alloy steel material is discharged from the furnace; (3) pickling and phosphating; (4) cold drawing. Grains of a wire rod produced by using the production process disclosed by the invention are refined and equiaxed, and need to remain stable during deformation; an average grain size is not less than 10 grades; the wire rod has super-plastic deformability, and the spheroidization rate is not less than 5 grades; a phosphating film is compact and even, and has higher lubricating property, and equipment loss is reduced by more than 30 percent.

Description

The major diameter hexagon bolt production technique of superplasticity ferrous materials
Technical field
The present invention relates to wire rod process field technology, refer in particular to a kind of production technique of major diameter hexagon bolt superplasticity ferrous materials.
Background technology
Hexagon bolt fastening piece as be the most frequently used, the most simply, one of the most effective connecting mode, there is long developing history.It has the advantages such as connecting forces is strong, easy disassembly, by stdn, can be mass-produced, and therefore low, the low price of its cost, is now widely used in all trades and professions.Along with the progress of material and manufacturing process, various material, various types of Novel bolt fastening piece emerge in multitude, and carry prior effect.Bolt fasteners is endowed more and more important effect in continuous development, produces more and more deep impact to our production and life.
Hexagon bolt fastening piece, owing to having the features such as supporting capacity is strong, reliability is high, interchangeability is good, use cost is low, is thus widely used in the engineering fields such as machinery, space flight and aviation, building.Tool is added up, one joint railroad car needs fastening piece 1210, comprising 155 bolts, 121 nuts, 900 rivets and many other fastening pieces, a frame Luo Kehuode C5A conveyor need with more than 2,660,000 fastening pieces, and tank need with more than 7000 fastening pieces.One of steel building green building being described as 21 century, bolt connection is the important mode of connection of steel construction node.Along with the progress of Materials science and complete processing, bolt fasteners have also been obtained develop rapidly.In order to tackle the requirement of automobile, motorcycle industry high performance and lightness, high strength bolt is widely applied.In automobile industry, the usage quantity of the bolt of less than 8.8 grades is very limited, extensively adopts high strength bolt.
The domestic material for the production of more than 10.9 grades superstrength major diameter hexagon bolts has the medium carbon alloy steels such as SCM435,35CrMo, 40Cr, 42CrMo at present, although it has good mechanical property, but an actual production difficult problem is large, and problem is as follows: 1. easy to crack, yield rate is low.Due to carbon with alloy ingredient content is high, material is hard, when cold-heading molding because plasticity is inadequate, easily cause it to ftracture, cause a large amount of waste products.2. equipment heavy-duty, cost is high.The production of modern high strength bolt all adopts multistage cold former, carries out at normal temperatures.And for major diameter hexagon bolt, its machining deformation amount is large, add that current material hardness is high, improve cold headers tonnagedemand, the cold headers of lower tonnage cannot be produced.And, in current China market, bolt product structure is very unreasonable, common low strength bolt market saturated, product overstocked, overcapacity in a large number on the one hand, and on the other hand required for high strength, large gauge, special shaped screw bolt shortage is serious, supply falls short of demand, need import for a long time, and China all with in the world also exists gap in starting material and manufacture craft.Poor, the specification of domestic raw-material quality stability of buying is not suitable for, and have impact on the thermal treatment process of bolt making, wasting financial resources, while material resources, have impact on the quality of bolt.All there is certain gap with same kind of products at abroad in the quality of high strength bolting steel, size, profile.The constituent content fluctuation of wire rod is large, difference is large, lack of homogeneity, causes the performance difference of the heart portion after bolt product thermal treatment and edge large.
Given this, be necessary to research and develop a kind of major diameter hexagon bolt superplasticity ferrous materials.
Summary of the invention
In view of this, the present invention is directed to the disappearance of prior art existence, its main purpose is to provide a kind of production technique of major diameter hexagon bolt superplasticity ferrous materials, and it effectively can solve high, the moulding bad problem of existing major diameter hexagon bolt hardness.
For achieving the above object, the present invention adopts following technical scheme:
A production technique for major diameter hexagon bolt superplasticity ferrous materials, includes following steps:
(1) selection: choose alloy steel material, its chemical constitution contains in mass %: the Mo of Cr, 0.16-0.29% of S, 0.91-1.19% of P, 0.010-0.020% of Mn, 0.015-0.025% of Si, 0.61-0.89% of C, 0.16-0.34% of 0.34-0.37%, and all the other are Fe;
(2) Spheroidizing Annealing: alloy steel material is put into atmosphere protection stove, protective atmosphere is added with in atmosphere protection stove, be warmed up to stable austenite district, insulation 4-6 hour, and then progressively cool to below austenite transformation temperature 20-30 DEG C with 10 DEG C/h, insulation 3-4 hour, then cool to the furnace and come out of the stove;
(3) acid washing phosphorization: utilize the oxide skin on acid solution removal alloy steel material surface, then alloy steel carries out bonderizing, makes to form phosphatize phosphate coat on the surface at wire rod;
(4) cold drawn: to utilize drawing wire machine alloy steel to carry out drawing, take the principle that total draught is large, Partial shrinkage rate is little to carry out, wherein total draught >=50%, Partial shrinkage rate≤10%.
As a kind of preferred version, described protective atmosphere is methyl alcohol, and methanol stream amount is 2L/min.
As a kind of preferred version, described acid solution includes hydrochloric acid and phosphoric acid, utilizes the oxide skin on hydrochloric acid removal alloy steel material surface, utilizes phosphoric acid to make the alloy steel material of removal surface scale adhere to one deck phosphatize phosphate coat.
The present invention compared with prior art has obvious advantage and beneficial effect, specifically, as shown from the above technical solution:
Through the present invention produce obtain its grain refining of wire rod, isometry, and to keep stable between deformation phases, mean grain size >=10 grade, wire rod possesses superplastic deformation ability, Oxygen potential >=5 grade, phosphatize phosphate coat dense uniform, there is higher lubricity, reduce equipment loss more than 30%, and product diameter >=10.0mm, wire rod meets production more than 10.9 grades hexagon bolt requirements; Product properties is obviously better than existing market analogous products, better can be applied to the processing of major diameter hexagon bolt, extend production unit and mold use performance and life-span, effectively reduce production cost, there are good market outlook, for company creates considerable economic benefit.
For more clearly setting forth constitutional features of the present invention and effect, below in conjunction with accompanying drawing and specific embodiment, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the Production Flow Chart schematic diagram of the preferred embodiment of the present invention.
Embodiment
Please refer to shown in Fig. 1, the present invention discloses a kind of production technique of major diameter hexagon bolt superplasticity ferrous materials, includes following steps:
(1) selection: choose alloy steel material, its chemical constitution contains in mass %: the Mo of Cr, 0.16-0.29% of S, 0.91-1.19% of P, 0.010-0.020% of Mn, 0.015-0.025% of Si, 0.61-0.89% of C, 0.16-0.34% of 0.34-0.37%, and all the other are Fe; Especially S, P content is strictly controlled during material feeding inspection, to Segregation of Chemical Composition, the stability aspect of interior tissue situation, original size precision and various performance inconsistency more strictly controls, to meet the needs of production, in ferrous materials, add Cr, Mo element, can crystal grain thinning, strengthening lattice, effectively can improve hardening capacity and the resistance to tempering of steel, so the intensity of steel can be improved further, improve the mechanical property of steel.
(2) Spheroidizing Annealing: alloy steel material is put into atmosphere protection stove; protective atmosphere is added with in atmosphere protection stove; be warmed up to stable austenite district; insulation 4-6 hour; and then progressively cool to below austenite transformation temperature 20-30 DEG C with 10 DEG C/h; insulation 3-4 hour, then cool to the furnace and come out of the stove.Described protective atmosphere is methyl alcohol, and methanol stream amount is 2L/min.Whole process is carried out in methyl alcohol atmosphere, to guarantee it not by decarburization.Whole process key is to control temperature, if holding temperature is too high, cementite will evenly be dissolved in austenite, thus form single uniform austenite structure, theoretical according to nodularization, uniform austenite is difficult to be transformed into spheroidite tissue, in like manner, when holding temperature is lower, cementite by abundant molten disconnected, is not also difficult to obtain spherodized structure.
(3) acid washing phosphorization: utilize the oxide skin on acid solution removal alloy steel material surface, then alloy steel carries out bonderizing, makes to form phosphatize phosphate coat on the surface at wire rod.Described acid solution includes hydrochloric acid and phosphoric acid, utilizes the oxide skin on hydrochloric acid removal alloy steel material surface, utilizes phosphoric acid to make the alloy steel material of removal surface scale adhere to one deck phosphatize phosphate coat.Acid washing phosphorization process is for steel rust removing and antirust design, there is rust cleaning power strong, matrix corrosion is little, the features such as corrosion resistance and good, after phosphatization lubrication, the wire rod corrosion-resistant time increases greatly, for following process and transport provide strong guarantee, simultaneously due to its surface soundness and have good oilness, extend the work-ing life of equipment, consumptive material greatly.And, technique uses hydrochloric acid and phosphoric acid mixing acid to replace single hydrochloric acid effectively to improve the corrosion resistance nature of wire rod at pickling process, in acid pickling groove liquid, add a small amount of organic promoter makes pickling time shorten more than one times simultaneously, reduces the possibility that wire rod produces light crisp phenomenon; This technique adopts carboxylic acid activated wire surface before phosphatization operation, effectively can reduce phosphating time and can make phosphatize phosphate coat more dense uniform effectively can also reduce thickness simultaneously and reduce production cost.
(4) cold drawn: to utilize drawing wire machine alloy steel to carry out drawing, take the principle that total draught is large, Partial shrinkage rate is little to carry out, wherein total draught >=50%, Partial shrinkage rate≤10%.Total draught is large, its deflection produced is larger, the interior tissue of steel wire by the drawing-down of machinery, draw broken, produce stress value higher, for follow-up Spheroidizing Annealing provides more energy, Oxygen potential is improved, plasticity improves, take little Partial shrinkage rate simultaneously, Steel Wire Surface work hardening capacity in the course of processing is significantly reduced, stability of enhancing product performance.
The present invention will be described to use specific embodiment below.
Embodiment 1
(1) selection: choose alloy steel material, its chemical constitution contains in mass %: the C of 0.34%, the Si of 0.16%, 0.61% Mn, the P of 0.015%, S, the Cr of 0.91%, the Mo of 0.16% of 0.010%, all the other are Fe.
(2) Spheroidizing Annealing: alloy steel material is put into atmosphere protection stove, is added with protective atmosphere in atmosphere protection stove, is warmed up to stable austenite district; be incubated 4 hours; and then progressively cool to below austenite transformation temperature 20 DEG C with 10 DEG C/h, be incubated 3 hours, then cool to the furnace and come out of the stove.Described protective atmosphere is methyl alcohol, and methanol stream amount is 2L/min.
(3) acid washing phosphorization: utilize the oxide skin on acid solution removal alloy steel material surface, then alloy steel carries out bonderizing, makes to form phosphatize phosphate coat on the surface at wire rod.Described acid solution includes hydrochloric acid and phosphoric acid, utilizes the oxide skin on hydrochloric acid removal alloy steel material surface, utilizes phosphoric acid to make the alloy steel material of removal surface scale adhere to one deck phosphatize phosphate coat.
(4) cold drawn: to utilize drawing wire machine alloy steel to carry out drawing, take the principle that total draught is large, Partial shrinkage rate is little to carry out, wherein total draught is 50%, and Partial shrinkage rate is 10%.
The wire rod obtained after the present embodiment process is carried out diameter, Oxygen potential, mean grain size, product rank after Tempering and Quenching, tensile strength and Hardness Surveillance, diameter, Oxygen potential, mean grain size, product rank after Tempering and Quenching, the method of inspection of tensile strength and hardness is existing mature technology, at this to diameter, Oxygen potential, mean grain size, product rank after Tempering and Quenching, the method of inspection of tensile strength and hardness does not describe in detail, the data that inspection obtains are: product diameter is 10.0mm, nodulizing grade is 5 grades, mean grain size is 10 grades, after Tempering and Quenching, product rank is 10.9 grades, tensile strength is 1000MPa, hardness (HRC) is 32.
Embodiment 2
(1) selection: choose alloy steel material, its chemical constitution contains in mass %: the C of 0.37%, the Si of 0.34%, 0.89% Mn, the P of 0.025%, S, the Cr of 1.19%, the Mo of 0.29% of 0.020%, all the other are Fe.
(2) Spheroidizing Annealing: alloy steel material is put into atmosphere protection stove, is added with protective atmosphere in atmosphere protection stove, is warmed up to stable austenite district; be incubated 6 hours; and then progressively cool to below austenite transformation temperature 30 DEG C with 10 DEG C/h, be incubated 4 hours, then cool to the furnace and come out of the stove.Described protective atmosphere is methyl alcohol, and methanol stream amount is 2L/min.
(3) acid washing phosphorization: utilize the oxide skin on acid solution removal alloy steel material surface, then alloy steel carries out bonderizing, makes to form phosphatize phosphate coat on the surface at wire rod.Described acid solution includes hydrochloric acid and phosphoric acid, utilizes the oxide skin on hydrochloric acid removal alloy steel material surface, utilizes phosphoric acid to make the alloy steel material of removal surface scale adhere to one deck phosphatize phosphate coat.
(4) cold drawn: to utilize drawing wire machine alloy steel to carry out drawing, take the principle that total draught is large, Partial shrinkage rate is little to carry out, wherein total draught is 55%, and Partial shrinkage rate is 8%.
The wire rod obtained after the present embodiment process is carried out diameter, Oxygen potential, mean grain size, product rank after Tempering and Quenching, tensile strength and Hardness Surveillance, diameter, Oxygen potential, mean grain size, product rank after Tempering and Quenching, the method of inspection of tensile strength and hardness is existing mature technology, at this to diameter, Oxygen potential, mean grain size, product rank after Tempering and Quenching, the method of inspection of tensile strength and hardness does not describe in detail, the data that inspection obtains are: product diameter is 12mm, nodulizing grade is 6 grades, mean grain size is 11 grades, after Tempering and Quenching, product rank is 11 grades, tensile strength is 1100MPa, hardness (HRC) is 39.
Embodiment 3
(1) selection: choose alloy steel material, its chemical constitution contains in mass %: the C of 0.35%, the Si of 0.20%, 0.75% Mn, the P of 0.021%, S, the Cr of 1.06%, the Mo of 0.22% of 0.015%, all the other are Fe.
(2) Spheroidizing Annealing: alloy steel material is put into atmosphere protection stove; protective atmosphere is added with in atmosphere protection stove; be warmed up to stable austenite district; be incubated 5 hours; and then progressively cool to below austenite transformation temperature 25 DEG C with 10 DEG C/h; be incubated 3.5 hours, then cool to the furnace and come out of the stove.Described protective atmosphere is methyl alcohol, and methanol stream amount is 2L/min.
(3) acid washing phosphorization: utilize the oxide skin on acid solution removal alloy steel material surface, then alloy steel carries out bonderizing, makes to form phosphatize phosphate coat on the surface at wire rod.Described acid solution includes hydrochloric acid and phosphoric acid, utilizes the oxide skin on hydrochloric acid removal alloy steel material surface, utilizes phosphoric acid to make the alloy steel material of removal surface scale adhere to one deck phosphatize phosphate coat.。
(4) cold drawn: to utilize drawing wire machine alloy steel to carry out drawing, take the principle that total draught is large, Partial shrinkage rate is little to carry out, wherein total draught is 60%, and Partial shrinkage rate is 6%.
The wire rod obtained after the present embodiment process is carried out diameter, Oxygen potential, mean grain size, product rank after Tempering and Quenching, tensile strength and Hardness Surveillance, diameter, Oxygen potential, mean grain size, product rank after Tempering and Quenching, the method of inspection of tensile strength and hardness is existing mature technology, at this to diameter, Oxygen potential, mean grain size, product rank after Tempering and Quenching, the method of inspection of tensile strength and hardness does not describe in detail, the data that inspection obtains are: product diameter is 15mm, nodulizing grade is 7 grades, mean grain size is 12 grades, after Tempering and Quenching, product rank is 11 grades, tensile strength is 1200MPa, hardness (HRC) is 36.
The above, it is only preferred embodiment of the present invention, not technical scope of the present invention is imposed any restrictions, thus every above embodiment is done according to technical spirit of the present invention any trickle amendment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (3)

1. a major diameter hexagon bolt production technique for superplasticity ferrous materials, is characterized in that: include following steps:
(1) selection: choose alloy steel material, its chemical constitution contains in mass %: the Mo of Cr, 0.16-0.29% of S, 0.91-1.19% of P, 0.010-0.020% of Mn, 0.015-0.025% of Si, 0.61-0.89% of C, 0.16-0.34% of 0.34-0.37%, and all the other are Fe;
(2) Spheroidizing Annealing: alloy steel material is put into atmosphere protection stove, protective atmosphere is added with in atmosphere protection stove, be warmed up to stable austenite district, insulation 4-6 hour, and then progressively cool to below austenite transformation temperature 20-30 DEG C with 10 DEG C/h, insulation 3-4 hour, then cool to the furnace and come out of the stove;
(3) acid washing phosphorization: utilize the oxide skin on acid solution removal alloy steel material surface, then alloy steel carries out bonderizing, makes to form phosphatize phosphate coat on the surface at wire rod;
(4) cold drawn: to utilize drawing wire machine alloy steel to carry out drawing, take the principle that total draught is large, Partial shrinkage rate is little to carry out, wherein total draught >=50%, Partial shrinkage rate≤10%.
2. the production technique of major diameter hexagon bolt superplasticity ferrous materials according to claim 1, it is characterized in that: described protective atmosphere is methyl alcohol, methanol stream amount is 2L/min.
3. the production technique of major diameter hexagon bolt superplasticity ferrous materials according to claim 1, it is characterized in that: described acid solution includes hydrochloric acid and phosphoric acid, utilize the oxide skin on hydrochloric acid removal alloy steel material surface, utilize phosphoric acid to make the alloy steel material of removal surface scale adhere to one deck phosphatize phosphate coat.
CN201511003654.0A 2015-12-29 2015-12-29 Production process for super-plastic steel and iron material for large-diameter hexagon bolt Pending CN105525223A (en)

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Application publication date: 20160427