CN105420633A - Screw - Google Patents

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Publication number
CN105420633A
CN105420633A CN201510794060.XA CN201510794060A CN105420633A CN 105420633 A CN105420633 A CN 105420633A CN 201510794060 A CN201510794060 A CN 201510794060A CN 105420633 A CN105420633 A CN 105420633A
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China
Prior art keywords
screw
treatment
steel
temper
insulation
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CN201510794060.XA
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Chinese (zh)
Inventor
任鹏坤
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Ningbo Ruier Auto Parts Co Ltd
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Ningbo Ruier Auto Parts Co Ltd
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Priority to CN201510794060.XA priority Critical patent/CN105420633A/en
Publication of CN105420633A publication Critical patent/CN105420633A/en
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Abstract

The invention relates to a fastener, in particular to a screw, and belongs to the technical field of alloy materials. Steel comprises, by mass, 0.15-0.20% of C, 0.12-0.18% of Si, 1.2-1.6% of Mn, 1.30-1.60% of Cr, 0.03-0.1% of Ti, 0.1-0.2% of Nb, 0.002-0.005% of V, 0.02-0.10% of Sc, 0.01-0.03% of Ni, 0.005-0.20% of B, 0.03-0.10% of Tb, 0-0.03% of Cu, 0-0.03% of P, 0-0.03% of S, and the balance Fe and inevitable impurity elements. The constituents and mass percentage of the alloy steel of the screw are reasonable in compatibility, the hard and abrasion-resisting surface and the tough core part are achieved after carburizing treatment is conducted, the higher low-temperature impact toughness and good machinability are achieved, the core part of the screw still keeps the toughness and plasticity, and thus the strength, hardness, toughness, corrosion resistance and abrasion resistance of the screw are improved.

Description

A kind of screw
Technical field
The present invention relates to a kind of fastening piece, be specifically related to a kind of screw, belong to technical field of alloy material.
Background technology
Fastening piece commercially also referred to as standardized component, be two or more part (or component) is fastenedly connected become one overall time the general name of class mechanical component that adopts.Its feature is that description is various, and performance purposes is different, and stdn, seriation, unitized strong.Fastening piece is most widely used mechanical basic part, is in great demand.Conventional fastening piece comprises bolt, screw etc.
Screw, that front end is acuminous that, pitch is comparatively large, is generally used for fastening wooden part, plastic component, is common in machinery, electrical equipment and buildings etc., be generally metal manufacture, cylindrical, irregular ditch is carved on surface, as one around the scarp of screw side, allow screw tightly can lock outstanding screwed cap or other objects.The top diameter of screw is comparatively large, can rounded or etc. hexagon, allow instrument as turnscrew or the rotatable screw of spanner.Comparatively outstanding top also makes screw drilledly too deeply can not pass material, and improves screw to the pressure of material.
Existing screw is all adopt bulk metal structure, a lot of problem is still had to exist, as quality weight, materials cost is high, and wear resistance, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness etc. are general, the requirement of production can't be met in a lot of occasion, also require further improvement, to enhance productivity, reduce costs, improve security, extend the work-ing life of screw.
Summary of the invention
The present invention seeks to provide a kind of better mechanical property, the screw that wear-resistant, work-ing life is of a specified duration.
Above-mentioned purpose of the present invention realizes by following technical proposal: a kind of screw, described steel is made up of following composition (by percentage to the quality): C:0.15-0.20%, Si:0.12-0.18%, Mn:1.2-1.6%, Cr:1.30-1.60%, Ti:0.03-0.1%, Nb:0.1-0.2%, V:0.002-0.005%, Sc:0.02-0.10%, Ni:0.01-0.03%, B:0.005-0.20%, Tb:0.03-0.10%, Cu≤0.03%, P≤0.03%, S≤0.03%, surplus is Fe and inevitable impurity element.
In the steel that the present invention uses, C content is 0.15-0.20%, a kind of soft steel, plasticity and toughness better, hardening capacity is higher, there is hard and wear-resisting surface and tough and tensile heart portion after carburizing and quenching, so have the good processibility of higher low-temperature impact toughness, and machining deformation is small, and anti-fatigue performance is fairly good.In screw steel alloy of the present invention, if carbon content is too high, the toughness in the heart portion of steel can be caused to decline, so C content is 0.15-0.20% by the present invention, thus ensure that there are enough plasticity and toughness in the heart portion of steel.
Because the intensity of soft steel and hardness can be relatively low, the present invention suitably adds the content of Mn, to improve intensity and the hardness of steel.Meanwhile, also simultaneously containing Nb, Ti, V tri-kinds of trace elements in steel of the present invention, play synergy with Mn element, common intensity and the hardness improving steel.Because, Nb, Ti, V tri-kinds of trace elements not only can crystal grain thinning, Dispersed precipitate Nb (the C of more high-volume fractional can also be obtained, N), (Nb, Ti) (C, N), with V (C, N) precipitate particle, therefore, can play the effect of refined crystalline strengthening and dispersion-strengthened simultaneously.In addition, Mn element with also play synergy with Cr, Ni, B tri-kinds of elements of containing in steel, improve the hardening capacity of steel, thus make steel after carburizing and quenching, improve intensity and the toughness in the heart portion of steel.So comprehensive above 2 factors, invention increases the content of Mn element in steel, are controlled within the scope of 1.2-1.6% by the content of Mn element.
In addition, because steel of the present invention carries out carburizing treatment in follow-up needs, and the microstructure coarsening of steel after carburizing treatment, mechanical property also can decline thereupon.Therefore, for this problem, rare earth Sc and the Tb of trace is added with in steel of the present invention, because our experiments show that, steel is in long-time heating carburizing heat treatment process, add rare earth element and there is the effect stoping grain growth and improve mechanical property, and effect highly significant, the flexural strength of the cementation zone of steel, fracture toughness property is higher.And, in steel, add rare earth element, the wear resistance of steel can also be improved, reduce abrasion loss.
As preferably, described steel is made up of following composition (by percentage to the quality): C:0.16-0.18%, Si:0.13-0.16%, Mn:1.3-1.5%, Cr:1.50-1.60%, Ti:0.05-0.08%, Nb:0.12-0.16%, V:0.002-0.004%, Sc:0.03-0.08%, Ni:0.015-0.025%, B:0.008-0.15%, Tb:0.05-0.08%, Cu≤0.03%, P≤0.03%, S≤0.03%, surplus is Fe and inevitable impurity element.
Another object of the present invention is the preparation method providing above-mentioned screw, and described preparation method comprises the steps:
Take the raw material as above-mentioned moiety and mass percent thereof, make steel;
Steel are carried out successively normalizing treatment, mechanical workout, thermal treatment obtains screw blank;
Screw blank is carried out degreasing and rust removal, activation treatment, blackening process, Passivation Treatment successively, screw finished product can be obtained.
In the preparation method of above-mentioned screw, as preferably, described normalizing treatment is isothermal normalizing process, and the temperature of described isothermal normalizing process is 930-950 DEG C, insulation 200-250min, with the cooling of 1.5KW exhaust fan after normalizing treatment completes and comes out of the stove.Normalizing treatment is isothermal normalizing process, and because the carbon content in screw steel alloy of the present invention is lower, belong to soft steel, machinability is not good, and normalizing treatment can improve its machinability.So screw of the present invention have passed through normalizing treatment after shaping, the microstructure improving steel eliminates unrelieved stress, improves machinability, for the mechanical workout of carrying out subsequently is ready.And, what steel of the present invention adopted is isothermal normalizing process, inside and outside the heap existed due to cooling in heap when solving common normalizing treatment and the cooling conditions difference that causes of other factors larger, and cause steel local due to cooling rate too fast formation grain shellfish non-equilibrium microstructure, and slow too much proeutectoid ferrite and the too soft phenomenon separated out is crossed due to cooling rate in some positions of steel, thus can uniform formation be obtained, by the Hardness Control of steel within the specific limits, be more conducive to the carrying out of subsequent mechanical processing.
In the preparation method of above-mentioned screw, as preferably, described thermal treatment comprises carburizing treatment and temper, described carburizing treatment, for be first warming up to 890-910 DEG C, to be incubated 70-90min, then to be down to 880-900 DEG C, insulation 30-50min, then be down to 820-840 DEG C, insulation 20-40min, last air cooling is to room temperature; The temperature of described temper is 150-180 DEG C, and the time of temper is 100-140min.Because the carbon content of steel of the present invention is lower, belong to soft steel, so the screw blank using steel of the present invention to prepare first carries out carburizing treatment, carbon atom is made to penetrate into the upper layer of screw blank, screw blank is made to have the upper layer of high carbon steel, again through Quench and temper, make screw blank upper layer have high rigidity and wear resistance, and the heart portion of screw blank still remain toughness and the plasticity of soft steel.Carburizing treatment in thermal treatment of the present invention, by the quench treatment under three stage differing tempss, is first eliminated cementation zone carbide network and refinement core structure, is then improved diffusion layer organization, improves hardness and the wear resistance of screw further.
In the preparation method of above-mentioned screw, as preferably, the temperature of degreasing and rust removal process is 30-50 DEG C, and the treatment time is 5-10min, and treatment solution used is: thiocarbamide 2.5-3.5g/L, SODIUM PHOSPHATE, MONOBASIC 3-8g/L, OP-105-12ml/L.Degreasing and rust removal process of the present invention simplifies pre-treatment operation, and degreasing and rust removal is effective, screw any surface finish, without crossing erosion and Hydrogen Brittleness Phenomena.The clean-out system application of hydrochloric acid, sulfuric acid acidic group is comparatively extensive, and cost is low, and efficiency is higher, but the Cl that pickling is residual -, SO 4 2-very large to the post-etching harm of screw.The hidden danger that the phosphoric acid acidic group that the present invention adopts does not have erosion residual, more environmental protection, safety.
In the preparation method of above-mentioned screw, as preferably, the treatment solution that activation treatment adopts is: nitric acid 120-160ml/L, the hydrofluoric acid 200-210ml/L of 40%.Blackout part surface film oxide is removed in activation, makes it to expose active surface, can significantly improve uniformity coefficient and the sticking power of black film.
In the preparation method of above-mentioned screw, as preferably, blackening process treatment solution used is: CuSO 41.5-2.0g/L, (NH 4) 6mo 7o 218-20g/L, Na 2s 2o 33.0-3.6g/L, NiSO 41.4-1.8g/, ZnCl 23.2-3.5g/L.Further preferably, described blackening process carries out in two steps, the first step, and pH is 1.2-1.6, and the treatment time is 2-4min; Second step, pH is 3.2-3.6, and the treatment time is 4-8min, and two-step pretreatment carries out all at normal temperatures.Copper sulfate consumption must strictly control, and concentration is low, and film adhesion is poor; The general coppery of too high then rete.The excessive concentration of Sulfothiorine is then unfavorable for depositing of hair blackening liquid.
Compared with prior art, the present invention has the following advantages:
Moiety and the mass percent compatibility thereof of screw steel alloy of the present invention are reasonable, there is hard and wear-resisting surface and tough and tensile heart portion after carburizing treatment, there is the processibility that higher low-temperature impact toughness is good, the heart portion of screw still remains toughness and plasticity, again through the blackening process on surface, further increase the intensity of screw, hardness, toughness, erosion resistance and wear resistance, make screw better mechanical property of the present invention, screw hardness HRC reaches 58-63, layer depth 0.7-1.0, substantially prolongs work-ing life.
Embodiment
Be below specific embodiments of the invention, technical scheme of the present invention is further described, but the present invention is not limited to these embodiments.
Table 1: embodiment of the present invention 1-5 prepares moiety and the mass percent thereof of the steel of screw
Embodiment 1
Take the raw material as moiety and mass percent thereof in table 1 embodiment 1 respectively, make steel.
Steel are first carried out isothermal normalizing process, and the temperature of isothermal normalizing process is 950 DEG C, insulation 200min, and with the cooling of 1.5KW exhaust fan after normalizing treatment completes and comes out of the stove, then mechanical workout is shaping, and heat-treats to obtain screw blank; Thermal treatment comprises carburizing treatment and temper, and described carburizing treatment, for be first warming up to 910 DEG C, to be incubated 70min, then to be down to 900 DEG C, and insulation 30min, is then down to 840 DEG C, insulation 20min, and last air cooling is to room temperature; The temperature of described temper is 180 DEG C, and the time of temper is 100min.
(temperature of degreasing and rust removal process is 50 DEG C screw blank to be carried out successively degreasing and rust removal, treatment time is 5min, treatment solution used is: thiocarbamide 3.5g/L, SODIUM PHOSPHATE, MONOBASIC 3g/L, OP-1012ml/L), (treatment solution that activation treatment adopts is activation treatment: nitric acid 120ml/L, the hydrofluoric acid 210ml/L of 40%), blackening process (the first step, pH is 1.2, and the treatment time is 4min; Second step, pH is 3.2, and the treatment time is 8min, and two-step pretreatment carries out all at normal temperatures, and blackening process treatment solution used is: CuSO 41.5g/L, (NH 4) 6mo 7o 220g/L, Na 2s 2o 33.0g/L, NiSO 41.8g/, ZnCl 23.2g/L), common Passivation Treatment, screw finished product can be obtained.
Embodiment 2
Take the raw material as moiety and mass percent thereof in table 1 embodiment 2 respectively, make steel.
Steel are first carried out isothermal normalizing process, and the temperature of isothermal normalizing process is 945 DEG C, insulation 210min, and with the cooling of 1.5KW exhaust fan after normalizing treatment completes and comes out of the stove, then mechanical workout is shaping, and heat-treats to obtain screw blank; Thermal treatment comprises carburizing treatment and temper, and described carburizing treatment, for be first warming up to 895 DEG C, to be incubated 85min, then to be down to 885 DEG C, and insulation 45min, is then down to 825 DEG C, insulation 35min, and last air cooling is to room temperature; The temperature of described temper is 155 DEG C, and the time of temper is 130min.
(temperature of degreasing and rust removal process is 35 DEG C screw blank to be carried out successively degreasing and rust removal, treatment time is 8min, treatment solution used is: thiocarbamide 2.8g/L, SODIUM PHOSPHATE, MONOBASIC 7g/L, OP-106ml/L), (treatment solution that activation treatment adopts is activation treatment: nitric acid 150ml/L, the hydrofluoric acid 202ml/L of 40%), blackening process (the first step, pH is 1.5, and the treatment time is 3min; Second step, pH is 3.5, and the treatment time is 5min, and two-step pretreatment carries out all at normal temperatures, and blackening process treatment solution used is: CuSO 41.8g/L, (NH 4) 6mo 7o 219g/L, Na 2s 2o 33.3g/L, NiSO 41.5g/, ZnCl 23.4g/L), common Passivation Treatment, screw finished product can be obtained.
Embodiment 3
Take the raw material as moiety and mass percent thereof in table 1 embodiment 3 respectively, make steel.
Steel are first carried out isothermal normalizing process, and the temperature of isothermal normalizing process is 940 DEG C, insulation 225min, and with the cooling of 1.5KW exhaust fan after normalizing treatment completes and comes out of the stove, then mechanical workout is shaping, and heat-treats to obtain screw blank; Thermal treatment comprises carburizing treatment and temper, and described carburizing treatment, for be first warming up to 900 DEG C, to be incubated 80min, then to be down to 890 DEG C, and insulation 40min, is then down to 830 DEG C, insulation 30min, and last air cooling is to room temperature; The temperature of described temper is 160 DEG C, and the time of temper is 120min.
(temperature of degreasing and rust removal process is 40 DEG C screw blank to be carried out successively degreasing and rust removal, treatment time is 8min, treatment solution used is: thiocarbamide 3.0g/L, SODIUM PHOSPHATE, MONOBASIC 6g/L, OP-108ml/L), (treatment solution that activation treatment adopts is activation treatment: nitric acid 140ml/L, the hydrofluoric acid 205ml/L of 40%), blackening process (the first step, pH is 1.4, and the treatment time is 3min; Second step, pH is 3.4, and the treatment time is 6min, and two-step pretreatment carries out all at normal temperatures, and blackening process treatment solution used is: CuSO 41.8g/L, (NH 4) 6mo 7o 219g/L, Na 2s 2o 33.3g/L, NiSO 41.6g/, ZnCl 23.3g/L), common Passivation Treatment, screw finished product can be obtained.
Embodiment 4
Take the raw material as moiety and mass percent thereof in table 1 embodiment 4 respectively, make steel.
Steel are first carried out isothermal normalizing process, and the temperature of isothermal normalizing process is 935 DEG C, insulation 240min, and with the cooling of 1.5KW exhaust fan after normalizing treatment completes and comes out of the stove, then mechanical workout is shaping, and heat-treats to obtain screw blank; Thermal treatment comprises carburizing treatment and temper, and described carburizing treatment, for be first warming up to 905 DEG C, to be incubated 75min, then to be down to 895 DEG C, and insulation 35min, is then down to 835 DEG C, insulation 25min, and last air cooling is to room temperature; The temperature of described temper is 170 DEG C, and the time of temper is 110min.
(temperature of degreasing and rust removal process is 45 DEG C screw blank to be carried out successively degreasing and rust removal, treatment time is 6min, treatment solution used is: thiocarbamide 3.2g/L, SODIUM PHOSPHATE, MONOBASIC 4g/L, OP-1010ml/L), (treatment solution that activation treatment adopts is activation treatment: nitric acid 130ml/L, the hydrofluoric acid 208ml/L of 40%), blackening process (the first step, pH is 1.3, and the treatment time is 4min; Second step, pH is 3.3, and the treatment time is 7min, and two-step pretreatment carries out all at normal temperatures, and blackening process treatment solution used is: CuSO 41.6g/L, (NH 4) 6mo 7o 220g/L, Na 2s 2o 33.2g/L, NiSO 41.7g/, ZnCl 23.3g/L), common Passivation Treatment, screw finished product can be obtained.
Embodiment 5
Take the raw material as moiety and mass percent thereof in table 1 embodiment 5 respectively, make steel.
Steel are first carried out isothermal normalizing process, and the temperature of isothermal normalizing process is 930 DEG C, insulation 250min, and with the cooling of 1.5KW exhaust fan after normalizing treatment completes and comes out of the stove, then mechanical workout is shaping, and heat-treats to obtain screw blank; Thermal treatment comprises carburizing treatment and temper, and described carburizing treatment, for be first warming up to 890 DEG C, to be incubated 90min, then to be down to 880 DEG C, and insulation 50min, is then down to 820 DEG C, insulation 40min, and last air cooling is to room temperature; The temperature of described temper is 150 DEG C, and the time of temper is 140min.
(temperature of degreasing and rust removal process is 30 DEG C screw blank to be carried out successively degreasing and rust removal, treatment time is 10min, treatment solution used is: thiocarbamide 2.5g/L, SODIUM PHOSPHATE, MONOBASIC 8g/L, OP-105ml/L), (treatment solution that activation treatment adopts is activation treatment: nitric acid 160ml/L, the hydrofluoric acid 200ml/L of 40%), blackening process (the first step, pH is 1.6, and the treatment time is 2min; Second step, pH is 3.6, and the treatment time is 4min, and two-step pretreatment carries out all at normal temperatures, and blackening process treatment solution used is: CuSO 42.0g/L, (NH 4) 6mo 7o 218g/L, Na 2s 2o 33.6g/L, NiSO 41.4g/, ZnCl 23.5g/L), common Passivation Treatment, screw finished product can be obtained.
Comparative example 1
The screw of comparative example 1 adopts commercially available 20CrMnTi low-carbon steel material.
Comparative example 2
Comparative example 2 is only with the difference of embodiment 3, and comparative example 2 uses the steel described in table 1 embodiment 3, obtains screw by usual way in prior art.
Comparative example 3
Comparative example 3 is only with the difference of embodiment 3, the common normalizing treatment technique that in comparative example 3, normalizing treatment adopts.
Comparative example 4
Comparative example 4 is only with the difference of embodiment 3, in comparative example 4 and without follow-up degreasing and rust removal, activation treatment, blackening process, Passivation Treatment.
The screw made by above-described embodiment 1-5 and comparative example 1-3 carries out Mechanics Performance Testing, and test result is as shown in table 2.
Table 2: embodiment 1-5 and comparative example 1-3 screw performance test result
From the test result of table 2, adopt the steel of moiety of the present invention and mass percent compatibility thereof, and the screw using preparation method of the present invention to be prepared from is better than the performance adopting common iron or the screw that adopts existing preparation method to be prepared from performance.
The screw embodiment of the present invention and comparative example prepared carries out wear resistance and erosion resistance test.
Wearability test adopts abrasion tester.Through statistics, under the same conditions, the wear loss of the screw that comparative example prepares is higher than the abrasion of the screw that embodiment prepares all the time.And along with the increase of wear test number of times, the difference of the wear loss of comparative example screw and embodiment screw is in expanding tendency.Wear test of the present invention is increased to 3000 times to screw friction from 100 times, and the wear loss mean range of comparative example and embodiment expands 12.7g to from 1.25g.
Erosion resistance test adopts humid heat test and salt spray corrosion test.Through statistics: under identical humid heat test condition, all there is not corrosion phenomenon in the screw that the embodiment of the present invention prepares, and the screw that comparative example prepares all occurs corrosion phenomenon after 1060h after 1060h, etching time the earliest appear at 860h.Under identical salt-fog test condition, all there is not corrosion phenomenon in the screw that the embodiment of the present invention prepares, and the screw that comparative example prepares all occurs corrosion phenomenon after 60h after 60h, etching time the earliest appear at 42h.
It can thus be appreciated that, adopt the steel of moiety of the present invention and mass percent compatibility thereof, and the screw using preparation method of the present invention to be prepared from also is better than the performance adopting common iron or the screw that adopts existing preparation method to be prepared from wear resistance and erosion resistance.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although made a detailed description the present invention and quoted some specific embodiments as proof, to those skilled in the art, only otherwise it is obvious for leaving that the spirit and scope of the present invention can make various changes or revise.

Claims (5)

1. a screw, it is characterized in that, described steel is made up of following composition (by percentage to the quality): C:0.15-0.20%, Si:0.12-0.18%, Mn:1.2-1.6%, Cr:1.30-1.60%, Ti:0.03-0.1%, Nb:0.1-0.2%, V:0.002-0.005%, Sc:0.02-0.10%, Ni:0.01-0.03%, B:0.005-0.20%, Tb:0.03-0.10%, Cu≤0.03%, P≤0.03%, S≤0.03%, surplus is Fe and inevitable impurity element.
2. screw according to claim 1, it is characterized in that, described steel is made up of following composition (by percentage to the quality): C:0.16-0.18%, Si:0.13-0.16%, Mn:1.3-1.5%, Cr:1.50-1.60%, Ti:0.05-0.08%, Nb:0.12-0.16%, V:0.002-0.004%, Sc:0.03-0.08%, Ni:0.015-0.025%, B:0.008-0.15%, Tb:0.05-0.08%, Cu≤0.03%, P≤0.03%, S≤0.03%, surplus is Fe and inevitable impurity element.
3. screw according to claim 1 and 2, is characterized in that, described screw obtains by the following method:
Take the raw material of moiety and mass percent thereof as claimed in claim 1 or 2, make steel;
Steel are carried out successively normalizing treatment, mechanical workout, thermal treatment obtains screw blank;
Screw blank is carried out degreasing and rust removal, activation treatment, blackening process, Passivation Treatment successively, screw finished product can be obtained.
4. screw according to claim 3, is characterized in that, the normalizing treatment described in screw preparation method is isothermal normalizing process, and the temperature of described isothermal normalizing process is 930-950 DEG C, insulation 200-250min.
5. screw according to claim 3, it is characterized in that, thermal treatment described in screw preparation method comprises carburizing treatment and temper, described carburizing treatment, for be first warming up to 890-910 DEG C, to be incubated 70-90min, then to be down to 880-900 DEG C, insulation 30-50min, then be down to 820-840 DEG C, insulation 20-40min, last air cooling is to room temperature; The temperature of described temper is 150-180 DEG C, and the time of temper is 100-140min.
CN201510794060.XA 2015-11-18 2015-11-18 Screw Withdrawn CN105420633A (en)

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CN104612965A (en) * 2014-11-26 2015-05-13 宁波市鸿博机械制造有限公司 Automobile steering pump rotor
CN104975244A (en) * 2015-05-14 2015-10-14 宁波汇通机械联接件有限公司 Thread type pipe joint and preparation method thereof

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CN110359007A (en) * 2019-07-16 2019-10-22 苏州新凌高强度紧固件有限公司 A kind of heat treatment method of 20MnTiB fastener

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