CN108160741A - Press part steel alloy wire rod preparation method, press part and its hardening and tempering process - Google Patents

Press part steel alloy wire rod preparation method, press part and its hardening and tempering process Download PDF

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Publication number
CN108160741A
CN108160741A CN201711460073.9A CN201711460073A CN108160741A CN 108160741 A CN108160741 A CN 108160741A CN 201711460073 A CN201711460073 A CN 201711460073A CN 108160741 A CN108160741 A CN 108160741A
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CN
China
Prior art keywords
presses
steel alloy
wire rod
line base
alloy wire
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Pending
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CN201711460073.9A
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Chinese (zh)
Inventor
王斯华
郝小龙
肖杰
刘晓祥
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Dongguan Keli Wire Technology Co Ltd
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Dongguan Keli Wire Technology Co Ltd
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Priority to CN201711460073.9A priority Critical patent/CN108160741A/en
Publication of CN108160741A publication Critical patent/CN108160741A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • 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
    • 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
    • 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

Abstract

The invention discloses a kind of preparation method for the part steel alloy wire rod that presses, press part and its hardening and tempering process, the processing of the steel alloy wire rod includes selection, an acid washing phosphorization, first cold-drawn, spheroidizing, white picking phosphatization and precision cold-drawn, the technique of wherein spheroidizing:In protective atmosphere, the line base of selection is warming up to more than austenite transformation temperature 20 40 DEG C, keeps the temperature 46 hours, is then slowly cooled to below austenite transformation temperature 20 30 DEG C, keeps the temperature 34 hours, then cool to 500 DEG C with the furnace and come out of the stove.The part that presses is process using steel alloy wire rod prepared by the above method, and hardening and tempering method includes:Step a, the part that presses is heated to 880 900 DEG C, oil cooling;Step b, the part that presses described in after oil cooling in step a is heated to 400 420 DEG C, air-cooled or water cooling.The gained part that presses can meet the uses of the special dimensions such as high-carbon steel.

Description

Press part steel alloy wire rod preparation method, press part and its hardening and tempering process
Technical field
The present invention relates to steel alloy processing technology field, more particularly to a kind of preparation side for the part steel alloy wire rod that presses Method, press part and its hardening and tempering process.
Background technology
Press refer to ambient pressure act under, the organism material for the part that presses is plastically deformed, squeeze into be riveted screw or In rivet coating nut structure in ad hoc pregroove marks, the mode that is reliably connected so as to fulfill two parts.
Mainly there are common low carbon steel plate, aluminium alloy plate, copper coin plank etc. using the material for the connection that presses at present, to high-carbon steel The harder material of the materials such as plank, needs the Self-Clinching Standoffs of special high intensity, and the intensity one of existing Self-Clinching Standoffs As cannot meet the requirements because realizing base material connection using riveting form, usually require that the intensity for the union piece that presses is big In the corresponding intensity of base material.
For a long time, the material of part of pressing substantially meets requirement in terms of plasticity, but the intensity of material is often not It is enough, seem insufficient in terms of impact resistance;And though high-strength material can meet the higher component system of some durability requirements It makes, but seems insufficient again in terms of plasticity, corresponding difficulty of processing is caused to increase.Therefore, people wish that research and development are a kind of both always There is higher intensity, firm stamping resistance after being molded, while there is the material of fine plasticity again.
Invention content
The embodiment of the present invention is designed to provide a kind of preparation method for the part steel alloy wire rod that presses, it is intended to by right After the line base of selection carries out acid washing phosphorization processing twice and cold-drawn twice, obtain not only with higher-strength but also with preferable plasticity High strength and ductility material can have a wide range of applications in terms of pressing with multistation molding.
The another object of the embodiment of the present invention is to provide one kind and presses part and its hardening and tempering process, it is intended to which raising presses part Intensity makes it can be applied to the connection of the base materials such as high-carbon steel plank.
In order to solve the above technical problems, technical solution provided in an embodiment of the present invention is:A kind of part steel alloy that presses Preparation method includes the following steps:
Step 1: selection:The steel alloy for choosing SCM435 is line base;
Step 2: acid washing phosphorization:After the line base is carried out pickling processes, then carry out phosphorating treatment;
Step 3: first cold-drawn:Multi-pass cold-drawn, total compression are carried out to the line base after phosphorating treatment using wire drawing machine Rate >=50%, every time compression ratio≤15% obtain medium line base;
Step 4: spheroidizing:By the medium line base in protective atmosphere, it is warming up to more than austenite transformation temperature 20-40 DEG C, 4-6 hours are kept the temperature, is then slowly cooled to below austenite transformation temperature 20-30 DEG C, keeps the temperature 3-5 hours, then with Stove is cooled to 500 DEG C and comes out of the stove;
Step 5: acid washing phosphorization:The medium line base come out of the stove is subjected to pickling processes, then carry out phosphorating treatment;
Step 6: precision cold-drawn:Single wire drawing, compression are carried out to the medium line base after phosphorating treatment using wire drawing machine Rate is 5-10%, obtains steel alloy wire rod.
The preparation method of the part steel alloy wire rod provided by the invention that presses, by the alloy steel line base of SCM435 by primary Acid washing phosphorization, first cold-drawn, spheroidizing, white picking phosphatization and precision cold-drawn, gained steel alloy wire rod mean grain size >=8 Grade, crystallite dimension is small, and crystal grain arrangement is uniform, and the abnormal structures such as no coarse grains, Widmannstatten structure have superplastic deformation energy Power is suitably applied multistation and shapes in technique;Especially acid washing phosphorization, the phosphating coat dense uniform of formation have twice Have compared with high-lubricity, reduce equipment loss 40%.
The embodiment of the present invention additionally provides one kind and presses part, the steel alloy wire rod that part uses the above method to prepare that presses It is made.
The embodiment of the present invention additionally provides a kind of hardening and tempering process for the part that presses, and the part that presses is the above-mentioned part that presses, institute The hardening and tempering process for stating the part that presses includes the following steps:
Step a, the part that presses is heated to 880-900 DEG C, keeps the temperature 1-3 hours, oil cooling;
Step b, the part that presses described in after oil cooling in step a is heated to 400-420 DEG C, keeps the temperature 2-4 hours, it is air-cooled or Water cooling.
Using the part tensile strength >=1200MPa that presses prepared in above-mentioned technical proposal, Rockwell hardness 40-42, product reaches To 12.9 grades of screw standards, the use of the special dimensions such as high-carbon steel can be met.The embodiment of the present invention also have low production cost and The advantage of good market prospects creates considerable economic benefit for enterprise.
Specific embodiment
In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below Embodiment is closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to solve The present invention is released, is not intended to limit the present invention.
The basic conception of the embodiment of the present invention is:The line base that the trade mark is SCM435 is chosen, by a pickling, first cold Pull out, spheroidising, white picking phosphatization and precision cold-drawn, the steel alloy wire rod of high-ductility is made, to meet multistation molding skill Requirement of the art to the part steel alloy wire rod plasticity that presses, while meet the intensity requirement for the part that presses.
Specifically, the preparation method of the part steel alloy wire rod provided in an embodiment of the present invention that presses, includes the following steps:
Step 1: selection:The steel alloy for choosing SCM435 is line base;
Step 2: acid washing phosphorization:After the line base is carried out pickling processes, then carry out phosphorating treatment;
Step 3: first cold-drawn:Multi-pass cold-drawn, total compression are carried out to the line base after phosphorating treatment using wire drawing machine Rate >=50%, every time compression ratio≤15% obtain medium line base;
Step 4: spheroidizing:By the medium line base in protective atmosphere, it is warming up to more than austenite transformation temperature 20-40 DEG C, 4-6 hours are kept the temperature, is then slowly cooled to below austenite transformation temperature 20-30 DEG C, keeps the temperature 3-5 hours, then with Stove is cooled to 500 DEG C and comes out of the stove;
Step 5: acid washing phosphorization:The medium line base come out of the stove is subjected to pickling processes, then carry out phosphorating treatment;
Step 6: precision cold-drawn:Single wire drawing, compression are carried out to the medium line base after phosphorating treatment using wire drawing machine Rate is 5-10%, obtains steel alloy wire rod.
Specifically, in above-mentioned steps one, in the line base, element type and its content are to through preparation side of the embodiment of the present invention What method obtained press, and the structure of part steel alloy wire rod, mechanical strength are affected.Therefore, to line base receiving inspection When, S, P content to be controlled strictly, and requires without Segregation of Chemical Composition, original size precision is high, ovality is small, surface matter It measures, to meet the needs of production.
Specifically, phosphorus (P) is brought into steel by ore, generally phosphorus is also harmful element.Though phosphorus can make the strong of steel Degree, hardness increase, but plasticity, impact flexibility are caused to significantly reduce.Particularly in low temperature, it makes steel significantly become fragile, this Phenomenon claims " cold short ".Cold short that the cold working of steel and weldability is made to degenerate, phosphorous higher, cold brittleness is bigger, therefore to phosphorous in steel Amount control is tighter.In the embodiment of the present invention, the content of P is controlled to be less than 0.025%.
Sulphur (S) is from the ore and fuel coke of steel-making.It is a kind of harmful element in steel.Sulphur is with iron sulfide (FeS) form is present in steel, and FeS and Fe form low melting point (985 DEG C) compound.And the hot processing temperature of steel generally exists 1150~1200 DEG C or more, so when steel hot-working, workpiece is caused to crack due to the too early fusing of FeS compounds, this Kind phenomenon is known as " hot-short ", reduces the ductility and toughness of steel, crackle is caused in forging and rolling.Sulphur to welding performance not yet Profit reduces corrosion resistance.In the embodiment of the present invention, the content of S is controlled below 0.025%.
In addition, in the embodiment of the present invention, Cr, Mo element are added in selected line base, can be strengthened with crystal grain thinning Lattice can effectively improve the quenching degree and resistance to tempering of steel, it is possible to further improve the strong of gained steel alloy wire rod Degree improves the mechanical performance of steel alloy.
Specifically, chromium (Cr) can increase the quenching degree of steel and play the role of post-curing, the hardness of carbon steel and resistance to can be improved Mill property is without making steel become fragile.Main function of the chromium in quenched structure is to improve quenching degree, make to have after the quenched tempering of steel compared with Good comprehensive mechanical property, can also form the carbide containing chromium, so as to improve the wearability of material surface in carburizing steel.This In inventive embodiments, the content preferred 1.0-1.20%, more preferable 1.0-1.15% of Cr.
Molybdenum (Mo) can improve quenching degree and heat resistance in steel, prevent temper brittleness, increase remanent magnetism and coercivity and Corrosion stability in certain media.In quenched and tempered steel, molybdenum can make the part compared with big cross section quench depth, through hardening, improve the temper resistance of steel Or temper resistance, part is allow to be tempered at relatively high temperatures, so as to more effectively eliminate (or reduction) residual stress, is improved Plasticity.In the embodiment of the present invention, the content preferred 0.20-0.30%, more preferable 0.20-0.25% of Mo.
As a preferred embodiment, the chemical composition of the line base by percentage to the quality, contains:
C:0.33-0.38%, Si:0.15-0.35%, Mn:0.60-0.90%, P≤0.025%, S≤0.025%, Cr: 1.0-1.15%, Mo:0.20-0.25%, remaining is Fe.
In above-mentioned steps four, the step of the spheroidizing in, it is preferred that be heated to the heating rate of 80-100 DEG C/h 760-780 DEG C, 5 hours are kept the temperature, then 710-720 DEG C is cooled to the speed of 10 DEG C/h, then keep the temperature 3 hours, cools to the furnace 500 DEG C are come out of the stove.Temperature is controlled, if holding temperature is excessively high, cementite will be uniformly dissolved in austenite, single so as to be formed Uniform austenite structure, according to nodularization theory, uniform austenite is difficult to be transformed into spheroidite tissue, similarly, works as guarantor When temperature is relatively low, cementite is not by fully molten disconnected, it is also difficult to obtain spherodized structure.
It is further preferred that the protective atmosphere is methanol gas, the flow of the methanol gas is 1.5-2.5L/min, It is preferred that 2.0L/min.The overall process of spheroidising carries out in methanol atmosphere, to ensure line base not by decarburization.
In above-mentioned steps two and step 5, the line base first carries out an acid washing phosphorization, first cold-drawn is then carried out, in essence It spends before cold drawing, carries out white picking phosphatization.Pickling processes twice, for removing the line base or the medium line base surface Oxide skin, prevents oxide skin during cold-drawn from damaging mold and steel wire surface, prepares good surface for subsequent painting or coating processing Friction when condition and reduction cold-drawn reduces cold-drawn power.Preferably, the pickle of the pickling processes is the mixed of hydrochloric acid and oxalic acid Close liquid.Oxalic acid is a kind of organic acid, but its effective hydrogen concentration is higher, can be quickly with wire surface after mixed in hydrochloric acid Oxide reacts, and is slowed down under sour concentration;Oxalic acid is a kind of weak acid for hydrochloric acid, after being reacted with wire surface, Small pore can be formed after wire surface reaction by wire surface, and line when this layer of small pore increases subsequent phosphatization process The contact surface area of material makes wire rod be quickly obtained fine and close phosphating coat after phosphatization.It is further preferred that the pickle In, the ratio between the hydrochloric acid and the mass concentration of the oxalic acid are 1:0.8-1.2.It, can using hydrochloric acid and the mixed liquor of the oxalic acid Line base table tune treatment process is saved, wherein the mass concentration of the hydrochloric acid is 10-15%.
Line base after progress pickling processes is subjected to phosphorating treatment, online base surface forms phosphating coat.The phosphating coat tool Have effectively can adsorb and carry lubricant during certain greasy property, particularly cold-drawn enters deformed area.It is created for cold-drawn good Lubricating condition, to reduce friction and the heat in Cold Drawing Process.
In above-mentioned steps three, in first Cold Drawing Process, total draught >=50%, partial shrinkage rate≤15% are controlled.Stagnation pressure Shrinkage is big, and the deflection generated is bigger, and the interior tissue of line base is broken by the drawing-down of machinery, drawing, and generation stress value is higher, is Follow-up spheroidizing provides more energy, improves Oxygen potential, and plasticity improves, while takes small partial shrinkage rate, makes to add Steel wire surface work-hardening capacity is greatly lowered during work, stability of enhancing product performance.The total draught is i.e. by line Base is cold drawing to the cross section total draught of finished wire rod.
Embodiment 1
Step 1: selection:Line base is chosen, chemical composition by percentage to the quality, contains:
C:0.35%, Si:0.20%, Mn:0.65%, P:0.015%, S:0.010%, Cr:1.0%, Mo:0.25%, Remaining is Fe.
Step 2: acid washing phosphorization:After the line base is carried out pickling processes, then carry out phosphorating treatment.The line base is in salt Acid is with removing oxide in the mixed liquor of oxalic acid, the mass concentration of the hydrochloric acid is 10%, and the mass concentration ratio with oxalic acid is 1: 1.Then the line base after pickling is subjected to phosphorating treatment in phosphate solution so that phosphatization is formed on wire surface Film.
Step 3: first cold-drawn:Multi-pass cold-drawn is carried out to the line base after phosphorating treatment using wire drawing machine, makes stagnation pressure Shrinkage >=50%, every time compression ratio≤15%, primary drawing obtain medium line base;
Step 4: spheroidizing:By the medium line base in methanol atmosphere, 760 DEG C are warming up to 80 DEG C/h, heat preservation 4 Hour, 720 DEG C then are progressively cooled to 10 DEG C/h again, keeps the temperature 3 hours, then cool to 500 DEG C with the furnace and come out of the stove.The methanol gas Body flow is 2L/min.
Step 5: acid washing phosphorization:The medium line base come out of the stove is removed into oxide in the mixed liquor of hydrochloric acid and oxalic acid, Then phosphorating treatment is carried out in phosphate solution to line base so that phosphating coat is formed on wire surface.The matter of the hydrochloric acid A concentration of 10% is measured, the mass concentration ratio with oxalic acid is 1:1.2.
Step 6: precision cold-drawn:Single wire drawing, compression are carried out to the medium line base after phosphorating treatment using wire drawing machine Rate is 8%, obtains steel alloy wire rod.
The wire rod obtained after the present embodiment is handled is subjected to Oxygen potential, grain size, metallographic structure and decarburized layer deepness Detection, above-mentioned detection method carry out with reference to existing standard, each detection method are not described in detail, the data ginseng examined It is shown in Table 1.
Embodiment 2
Step 1: selection:Line base is chosen, chemical composition by percentage to the quality, contains:
C:0.33%, Si:0.15%, Mn:0.75%, P:0.015%, S:0.010%, Cr:1.2%, Mo:0.20%, Remaining is Fe.
Step 2: acid washing phosphorization:After the line base is carried out pickling processes, then carry out phosphorating treatment.The line base is in salt Acid is with removing oxide in the mixed liquor of oxalic acid, the mass concentration of the hydrochloric acid is 15%, and the mass concentration ratio with oxalic acid is 1: 0.8.Then the line base after pickling is subjected to phosphorating treatment in phosphate solution so that phosphatization is formed on wire surface Film.
Step 3: first cold-drawn:Multi-pass cold-drawn is carried out to the line base after phosphorating treatment using wire drawing machine, makes stagnation pressure Shrinkage is 60%, every time compression ratio≤15%, primary drawing obtains medium line base;
Step 4: spheroidizing:By the medium line base in methanol atmosphere, 780 DEG C are warming up to 100 DEG C/h, heat preservation 4 Hour, 710 DEG C then are progressively cooled to 10 DEG C/h again, keeps the temperature 3 hours, then cool to 500 DEG C with the furnace and come out of the stove.The methanol gas Body flow is 2L/min.
Step 5: acid washing phosphorization:The line base come out of the stove is removed into oxide in the mixed liquor of hydrochloric acid and oxalic acid, then Phosphorating treatment is carried out in phosphate solution to line base so that phosphating coat is formed on wire surface.The quality of the hydrochloric acid is dense It is 15% to spend, and the mass concentration ratio with oxalic acid is 1:0.8.
Step 6: precision cold-drawn:Single wire drawing, compression are carried out to the medium line base after phosphorating treatment using wire drawing machine Rate is 5%, obtains steel alloy wire rod.
The wire rod obtained after the present embodiment is handled is subjected to Oxygen potential, grain size, metallographic structure and decarburized layer deepness Detection, as a result referring to table 1.
Embodiment 3
Step 1: selection:Line base is chosen, chemical composition by percentage to the quality, contains:
C:0.38%, Si:0.35%, Mn:0.90%, P:0.015%, S:0.010%, Cr:1.1%, Mo:0.25%, Remaining is Fe.
Step 2: acid washing phosphorization:After the line base is carried out pickling processes, then carry out phosphorating treatment.The line base is in salt Acid is with removing oxide in the mixed liquor of oxalic acid, the mass concentration of the hydrochloric acid is 12%, and the mass concentration ratio with oxalic acid is 1: 1.Then the line base after pickling is subjected to phosphorating treatment in phosphate solution so that phosphatization is formed on wire surface Film.
Step 3: first cold-drawn:Multi-pass cold-drawn is carried out to the line base after phosphorating treatment using wire drawing machine, makes stagnation pressure Shrinkage is 60%, and partial shrinkage rate≤15%, primary drawing obtains medium line base;
Step 4: spheroidizing:By the medium line base in methanol atmosphere, 760 DEG C are warming up to 80 DEG C/h, heat preservation 4 Hour, 720 DEG C then are progressively cooled to 10 DEG C/h again, keeps the temperature 3 hours, then cool to 500 DEG C with the furnace and come out of the stove.The methanol gas Body flow is 2L/min.
Step 5: acid washing phosphorization:The line base come out of the stove is removed into oxide in the mixed liquor of hydrochloric acid and oxalic acid, then Phosphorating treatment is carried out in phosphate solution to line base so that phosphating coat is formed on wire surface.The quality of the hydrochloric acid is dense It is 12% to spend, and the mass concentration ratio with oxalic acid is 1:1.
Step 4: precision cold-drawn:Single wire drawing, compression are carried out to the medium line base after phosphorating treatment using wire drawing machine Rate is 10%, obtains steel alloy wire rod.
The detection data of steel alloy wire rod described in 1 embodiment 1-3 of table
The wire rod obtained after the present embodiment is handled is subjected to Oxygen potential, grain size, metallographic structure and decarburized layer deepness Detection, as a result referring to table 1.
In conclusion steel alloy wire rod mean grain size >=8 grade obtained by the embodiment of the present invention, and crystal grain arrangement is uniform, tool Standby superplastic deformation ability, is suitably applied multistation and shapes in technique.
Embodiment 4
The steel alloy wire rod prepared using the method for embodiment 1, press part made from the processing of multistation forming technique.Institute State the following modifier treatment of the part that presses:
Step a, the part that presses is heated to 880-890 DEG C, keeps the temperature 2 hours, oil cooling;
Step b, the part that presses described in after oil cooling in step a is heated to 400-420 DEG C, keeps the temperature 3 hours, be air-cooled to room Temperature.
To after quenched the hardness that presses, the inspections such as tensile strength, as a result referring to table 2.
Embodiment 5
The steel alloy wire rod prepared using the method for embodiment 1, press part made from the processing of multistation forming technique, into The following modifier treatment of row:
Step a, the part that presses is heated to 890-900 DEG C, keeps the temperature 1 hour, oil cooling;
Step b, the part that presses described in after oil cooling in step a is heated to 410-420 DEG C, 2 hours, water cooling to room temperature.
To after quenched the hardness that presses, the inspections such as tensile strength, as a result referring to table 2.
Press the detection data of part described in 2 embodiment 4-5 of table
Detection project Technical indicator Embodiment 4 Embodiment 5
Rockwell hardness HRC 39-44 40 42
Tensile strength ≥1200MPa 1240MPa 1260MPa
The above result shows that the hardness HRC for the part that presses obtained by the embodiment of the present invention:39-44, tensile strength >=1200MPa, Reach 12.9 grades of screw standards, the use of the special dimensions such as high-carbon steel can be met.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.

Claims (9)

1. the preparation method for the part steel alloy wire rod that presses, which is characterized in that include the following steps:
Step 1: selection:The steel alloy for choosing SCM435 is line base;
Step 2: acid washing phosphorization:After the line base is carried out pickling processes, then carry out phosphorating treatment;
Step 3: first cold-drawn:Using wire drawing machine to after phosphorating treatment the line base carry out multi-pass cold-drawn, total draught >= 50%, partial shrinkage rate≤15% obtains medium line base;
Step 4: spheroidizing:By the medium line base in protective atmosphere, it is warming up to austenite transformation temperature more than 20-40 DEG C, 4-6 hours are kept the temperature, is then slowly cooled to below austenite transformation temperature 20-30 DEG C, keeps the temperature 3-5 hours, then furnace cooling It comes out of the stove to 500 DEG C;
Step 5: acid washing phosphorization:The medium line base come out of the stove is subjected to pickling processes, then carry out phosphorating treatment;
Step 6: precision cold-drawn:Single wire drawing is carried out to the medium line base after phosphorating treatment using wire drawing machine, compression ratio is 5-10% obtains steel alloy wire rod.
2. the preparation method of the part steel alloy wire rod as described in claim 1 that presses, which is characterized in that, will in step 4 The medium line base is heated to 760-780 DEG C in protective atmosphere, with the heating rate of 80-100 DEG C/h, keeps the temperature 4-6 hours, so 710-720 DEG C is cooled to the speed of 8-12 DEG C/h afterwards, then keeps the temperature 3-5 hours, 500 DEG C is cooled to the furnace and comes out of the stove.
3. the preparation method of the part steel alloy wire rod as claimed in claim 1 or 2 that presses, which is characterized in that in step 4, The protective atmosphere is methanol gas.
4. the preparation method of the part steel alloy wire rod as claimed in claim 3 that presses, which is characterized in that the methanol gas Flow is 1.5-2.5L/min.
5. the preparation method of the part steel alloy wire rod as claimed in claim 1 or 2 that presses, which is characterized in that in step 1, The chemical composition of the line base by percentage to the quality, contains:
C:0.33-0.38%, Si:0.15-0.35%, Mn:0.60-0.90%, P≤0.025%, S≤0.025%, Cr:1.0- 1.15%, Mo:0.20-0.25%, remaining is Fe.
6. the preparation method of the as claimed in claim 1 or 2 part steel alloy wire rod that presses, which is characterized in that step 2 and/ Or in step 5, the pickles of the pickling processes is hydrochloric acid and the mixed liquor of oxalic acid, and in the mixed liquor, the hydrochloric acid with The ratio between mass concentration of the oxalic acid is 1:0.8-1.2.
7. the preparation method of the part steel alloy wire rod as claimed in claim 6 that presses, which is characterized in that the quality of the hydrochloric acid A concentration of 10-15%.
The part 8. one kind presses, which is characterized in that the steel alloy that part is prepared using any the methods of claim 1-7 that presses Wire rod is made.
9. a kind of hardening and tempering process for the part that presses, which is characterized in that the part that presses is described for the part according to any one of claims 8 that presses The hardening and tempering process of part of pressing includes the following steps:
Step a, the part that presses is heated to 880-900 DEG C, keeps the temperature 1-3 hours, oil cooling;
Step b, the part that presses described in after oil cooling in step a is heated to 400-420 DEG C, keeps the temperature 2-4 hours, air-cooled or water It is cold.
CN201711460073.9A 2017-12-28 2017-12-28 Press part steel alloy wire rod preparation method, press part and its hardening and tempering process Pending CN108160741A (en)

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Cited By (8)

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CN110369953A (en) * 2019-07-19 2019-10-25 苏州中新精密工业有限公司 A kind of production technology of screw
CN111378814A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of axis wire of copier
CN111378905A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of fastener wire of baby carrier
CN111375649A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of automobile fastener wire
CN111926249A (en) * 2020-07-16 2020-11-13 舞阳钢铁有限责任公司 HB hardness 600 grade steel plate and production method thereof
CN112853068A (en) * 2020-12-31 2021-05-28 河南富瑞德金属制品有限公司 Preparation process of superfine oil quenching-tempering spring steel wire
CN114318125A (en) * 2020-09-30 2022-04-12 宝山钢铁股份有限公司 High-strength and high-toughness alloy tool steel wire and manufacturing method thereof

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CN109609738A (en) * 2018-12-27 2019-04-12 东莞科力线材技术有限公司 Mobile phone big homalocephalus precision screw wire rod and preparation method thereof
CN111378814A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of axis wire of copier
CN111378905A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of fastener wire of baby carrier
CN111375649A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of automobile fastener wire
CN111378814B (en) * 2018-12-29 2021-12-24 东莞科力线材技术有限公司 Preparation method of axis wire of copier
CN110369953A (en) * 2019-07-19 2019-10-25 苏州中新精密工业有限公司 A kind of production technology of screw
CN111926249A (en) * 2020-07-16 2020-11-13 舞阳钢铁有限责任公司 HB hardness 600 grade steel plate and production method thereof
CN114318125A (en) * 2020-09-30 2022-04-12 宝山钢铁股份有限公司 High-strength and high-toughness alloy tool steel wire and manufacturing method thereof
CN112853068A (en) * 2020-12-31 2021-05-28 河南富瑞德金属制品有限公司 Preparation process of superfine oil quenching-tempering spring steel wire

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Application publication date: 20180615