CN106282764B - A kind of preparation method of brake pipe joint - Google Patents
A kind of preparation method of brake pipe joint Download PDFInfo
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- CN106282764B CN106282764B CN201610661494.7A CN201610661494A CN106282764B CN 106282764 B CN106282764 B CN 106282764B CN 201610661494 A CN201610661494 A CN 201610661494A CN 106282764 B CN106282764 B CN 106282764B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
- C25D3/08—Deposition of black chromium, e.g. hexavalent chromium, CrVI
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
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Abstract
The present invention relates to a kind of preparation method of brake pipe joint, belong to alloy material processing technique field.The preparation method is：Dispensing, melting, smelting, pour into a mould, be rolled into steel plate；Steel are carried out to surface acid-washing derusting, lime stone coating, phosphorating treatment successively, it is then cold extrusion shaped to obtain brake pipe joint blank；Brake pipe joint blank is first to heat to 520 540 DEG C, 780 860 DEG C are then heated to, 980 1050 DEG C is again heated to and Quenching Treatment is carried out with quenching oil, be incubated 13 hours, then in 350 420 DEG C of tempers, 12 hours is incubated, obtains brake pipe joint semi-finished product；Brake pipe joint semi-finished product are made into surface by pulse plating the brake pipe joint of chrome plating.Brake pipe joint of the present invention is made of cold-forging steel, and the dual heat treatment of tempering, then pulse plating are increased temperature by first quenching, and improves the performances such as hardness, intensity, corrosion resistance, the temperature tolerance of brake pipe joint.
Description
Technical field
The present invention relates to a kind of preparation method of brake pipe joint, belong to alloy material processing technique field.
Background technology
With lasting, the fast development of national economy, the continuous improvement of living standards of the people, since two thousand two China's vapour
Car consumption market there occurs great variety.Private Car Consumption market is even more that blowout increases.In face of increasingly fierce market
Competition, the more safe and efficient auto parts and components of continuous research and development that automobile component part supply business is also growing with each passing hour.
Vehicle structure is mainly made up of engine, chassis, electrical equipment, vehicle body；Wherein, engine is the power dress of automobile
Put, be made up of 2 systems greatly of great institutions 5：Toggle, valve actuating mechanism, cooling system, fuel supply system, lube system, igniting system,
Start system's composition.Wherein, brake pipe joint will ensure that wear-resisting, media-resistant, resistance to oxidation, corrosion-resistant and service life are waited so long feature.
Brake pipe joint of the prior art is more based on research structure, such as TaiWan, China utility model patent patent name
" quick coupling device in disc brake gasoline shop " discloses a kind of brake pipe joint, its main element include a pin end,
One female joint, and a clamping close device, still, zero annex quantity inside each main element are excessive, not enough simplify, in cost benefit
On do not have competition benefit.In addition, when existing brake is intended to assembling (not shown) with car body, it is necessary to by the public access on brake
Head, female joint are separated in advance, but in the process, female joint will produce oil leakage phenomenon.And adopted existing brake pipe joint more
It is made up with conventional steel alloy of conventional processing method, it is its wearability, media-resistant, resistance to oxidation, corrosion-resistant more general, because
This brake pipe joint either all has much room for improvement in performance especially wearability, sealing, or service life.
The content of the invention
It is made that case hardness is high, intensity is high, wearability is good it is an object of the invention to provide a kind of, good corrosion resistance stops
The preparation method of car pipe joint.
The purpose of the present invention can be realized by following technical proposal：A kind of preparation method of brake pipe joint, it is described
Preparation method comprises the following steps：
Raw material is made steel：By the mass percent dispensing of brake pipe joint composition, be smelted into molten steel, molten steel is through smelting, cast,
It is rolled into steel plate；
It is cold extrusion shaped：Steel are carried out to surface acid-washing derusting, lime stone coating, phosphorating treatment, then cold extrusion successively
It is molded to obtain brake pipe joint blank；
Heat treatment：Brake pipe joint blank is first to heat to 520-540 DEG C, 780-860 DEG C is then heated to, is again heated to
980-1050 DEG C carries out Quenching Treatment with quenching oil, is incubated 1-3 hours, then in 350-420 DEG C of temper, and insulation 1-2 is small
When, obtain brake pipe joint semi-finished product；
Electrodeposited chromium layers：Brake pipe joint semi-finished product are made into surface by pulse plating the brake pipe joint of chrome plating,
Wherein pulse frequency is 3.2-3.5Hz, current density 60-68A/dm2, bath temperature is 50-55 DEG C.
The preparation method of brake pipe joint of the present invention first passes through the dual heat that quenching increases temperature tempering after cold extrusion shaped
Processing, then by pulse plating, forms corrosion-resistant, wear-resisting chromium coating on brake pipe joint surface.Brake pipe joint is quenched
The dual heat treatment that fire increases temperature tempering can make brake pipe joint have good comprehensive mechanical performance.
Using pulse plating, when current lead-through, the metal ion near cathode surface in liquid is by fast deposition；Electric current
During shut-off, the plated metal ion in bulk electrolysis liquid spreads to nearly cathodic region, make the metal of cathode surface nearby in liquid from
The concentration of son is restored.Therefore pulse plating has the ability of preferable smooth coating, is easy to get to smooth bright coating.Arteries and veins
, the variable of the latter only one of which independence, i.e. current density different from direct current electrode position are electroplated in punching；And the independent variable of pulse plating has
3, i.e. pulse frequency, dutycycle and current density.And pulse frequency greatly influences the micromorphology of chromium coating, typically
Pulse frequency be 3.0Hz, and when frequency be higher or lower than 3.0Hz when, all will influence chrome plating microcosmic appearance quality, reduction
Plated layer compact degree, the tendentiousness increase cracked, surface roughness rise.Its reason is when frequency is too high, next
When individual ON time arrives, the concentration of metal ions near negative electrode fails recovery in when off, with plating reduction reaction
Lasting to carry out, the metal ion near negative electrode is gradually used up, the concentration of metal ions in concentration of metal ions and plating solution at this
There is concentration polarization, and continue to increase, cause metal ion to move insufficient to cathode surface, promote the crystal of cathode surface to give birth to
Long speed is more than it and forms speed, and nucleation rate reduces, and causes coating coarse grains, sedimentary rough surface has a strong impact on deposition
The quality of layer.But brake pipe joint of the present invention has first passed through the cold extrusion shaped quenching of process again in pulse plating and increased temperature
The dual heat treatment of tempering, have impact on the tissue on brake pipe joint surface, now needs higher pulse frequency to a certain degree
Rate influences the micromorphology of chromium coating.In the preparation of brake pipe joint of the present invention, pulse frequency is improved to 3.2-
3.5Hz, can refine chromium coating crystal grain, reduce coating surface roughness, increase the consistency of sedimentary, reduce the shape of micro-crack
Into.Found through constantly experiment, at 50-55 DEG C, by pulse frequency control in 3.2-3.5Hz, current density 60-68A/dm2, can
Obtain crystal grain tiny, dense structure, low and flawless the chromium coating of surface roughness, and then improve the wear-resisting of brake pipe joint
Property, temperature tolerance, corrosion resistance.
In addition, post-curing effect occurs in high tempering.With the rise of temperature, intensity, the hardness of steel
Reduction, plasticity, toughness rise.Because improving steel containing elements such as Mo, Ti, V, Nb in brake pipe joint raw material of the present invention
Resistance to tempering；Alloy carbide is separated out in 380 DEG C of temperatures above tempering and post-curing is produced, and intensity and hardness are with tempering temperature
The rise change of degree is little；But when temperature is greater than about 450 DEG C, intensity and hardness drastically decline；In the same molten reinforcing of C atoms
Effect fades away under the collective effect gradually strengthened with the dispersion-strengthened action of alloying element, with the rise of temperature,
Plasticity change is little, and toughness is not influenceed by dispersion-strengtherning effect, so increasing substantially.And the raising of hardening heat, this
The brake pipe joint of invention is shown to fall after rising by grain coarsening and the combined influence of post-curing effect, its intensity and hardness
Trend, intensity is about 1000 DEG C by the critical austenite temperature for being raised to drop, and plasticity and toughness are gradually reduced, and toughness decline
Speed.
In the preparation method of above-mentioned brake pipe joint, the component and mass percent of the brake pipe joint are：
C：0.15-0.20%, Si：0.05-0.20%, Mn：0.80-1.10%, B：0.005-0.02%, Ti：0.04-0.08%, Al：
0.12-0.35%, Mo：0.6-0.8%, V：0.15-0.25%, Nb：0.005-0.02%, La：0.008-0.02%, P≤
0.02%th, S≤0.02%, surplus is Fe.
The steel alloy of brake pipe joint of the present invention is cold-forging steel, in the cold-forging steel, if carbon content is too low, in preparation process
In heat treatment after can have a strong impact on the intensity and hardness of cold-forging steel, if carbon content is higher, plasticity is low, in Cold Extrusion Process
Extremely cause cracking.Appropriate Si is added in cold-forging steel of the present invention can improve the intensity of cold forging steel, if Si contents are less than
0.05%, the yield strength of brake pipe joint can be influenceed.Although Mn is solution strengthening element, in the steel alloy of brake pipe joint
In, such as manganese content is too high, more than 1.1%, then the plasticity and toughness of brake pipe joint can be greatly lowered.Ti is in brake pipe joint
Steel alloy in can improve the strength and toughness of steel, particularly can with fixed nitrogen, eliminate nitrogen in steel element harm.Connect in brake pipe
The Al that 0.12-0.35% is added in the steel alloy of head makees strong deoxidier, reduces the oxygen content in steel, improves the matter of brake pipe joint
Amount.
0.005-0.02%B is added in the steel alloy of brake pipe joint of the present invention, compactness and heat to improve steel
Performance is rolled, the intensity of brake pipe joint is improved.Because being added with appropriate B in the steel alloy of brake pipe joint of the present invention, therefore
Without being made annealing treatment in preparation process of the present invention.Although boron-containing cold heading steel has the characteristics of quenching degree is good, cost is low, due to
Boron element is a sensitive elements, and its composition range needs preferable determine.If Boron contents are too low, raising steel through hardening is not reached
The effect of property；If Boron contents are too high, steel embrittlement can be made again, steel are easily cracked in process of production.In addition, if adding
Boron element in steel is oxidized or nitrogenized, and boron is lost quenching degree, therefore the 0.12- that boron-containing cold heading steel will be with addition
0.35% aluminium produces synergy, prevents boron to be oxidized, while adding 0.04-0.08%Ti prevents that boron element from being nitrogenized.
In the steel alloy of brake pipe joint of the present invention simultaneously add can crystal grain thinning Mo, Nb, V, dispersion-strengtherning, three
Added while planting element, and the proportioning between other components, it can will make the beneficial work between each element and its element
With substantially bringing into play simultaneously, intensity, hardness, corrosion resistance, the wearability of steel alloy are increased substantially.Wherein, add
0.6-0.8%Mo, refines crystalline grain of steel, improves quenching degree and thermostrength, suppresses steel alloy due to fragility caused by quenching, goes back
Enough intensity and creep resisting ability can be kept in high temperature, intrinsic creep strength is dominated by Mo, Mn and C atom pair concentration,
Its strengthening mechanism is the result that these atom pairs hinder dislocation ascending motion.Nb reduces the mistake temperature-sensitive of steel while crystal grain thinning
Perception and temper brittleness, improve intensity and corrosion resistance.0.15-0.25%V thinning microstructure crystal grain is added, intensity is improved and tough
Property.Vanadium is not only reinforcing compound formation element, or the excellent deoxidier of steel, can and carbon combination, form high-melting-point, high hard
Degree, high diffusive degree and stable VC carbide, and Ti, V and Mn element play synergy, and the intensity and hardness of steel are improved jointly,
Its reason, which is that Ti, V and Mn are used cooperatively, with crystal grain thinning, can also not only obtain the Dispersed precipitate analysis of more high-volume fractional
Go out particle, while play a part of refined crystalline strengthening and dispersion-strengtherning, the intensity of brake pipe joint, toughness and anti-can also be improved
Corrosive power.
In addition, being added in brake pipe joint steel alloy of the present invention has 0.008-0.02%La, presence of the La in carbon junction steel
Form has rare-earth sulfide, rare-earth oxide sulfate, solid solution and a rare earth intermetallic compound, wherein rare-earth sulfide, solid solution with it is dilute
The unstable chemcial property of compound between earth metal, very soluble in corrosive medium, discharges rare earth La3+And in cathode zone
Precipitation is so as to slow down the progress of corrosion.Rare earth is added in carbon junction steel makes the negative shifting of steel corrosion current potential, and corrosion current density reduces, cloudy
Pole reaction is hindered, and corrosion resisting property is improved, and the rare earth element added in steel serves the effect of cathodic corrosion inhibitor.With
Its rusty scale thickness of the increase of content of rare earth reduces caused.Charge migration resistance is directly related with the corrosion rate of steel matrix,
The increase of charge migration resistance shows the increase with content of rare earth, and the extent of corrosion of steel matrix mitigates, and corrosion resisting property is carried
It is high.
The impurity element such as sulphur, phosphorus directly affects brake pipe joint cold-forging steel cold heading performance in steel.In the smelting of cold-forging steel
In journey corresponding impurity should be removed for different steel grades.Some nonmetal inclusions destroy the matrix continuity of steel, in dead load and
In the presence of dynamic loading, the starting point often as cold-forging steel crackle.Therefore, should try one's best reduction nonmetallic inclusionsin steel, reduce
Its harm in steel.
Preferably, the component and mass percent of the brake pipe joint are：C：0.18-0.20%, Si：
0.08-0.12%, Mn：0.85-1.00%, B：0.01-0.18%, Ti：0.05-0.06%, Al：0.18-0.30%, Mo：
0.68-0.75%, V：0.18-0.22%, Nb：0.008-0.14%, La：0.01-0.018%, P≤0.02%, S≤
0.02%, surplus is Fe.
In the preparation method of above-mentioned brake pipe joint, the temperature of the melting is 1300-1350 DEG C.
In the preparation method of above-mentioned brake pipe joint, start rolling temperature is 980-1020 DEG C in rolling, and final rolling temperature is
880-910 DEG C, laying temperature is 850-880 DEG C, integrates volume temperature as 740-760 DEG C.
In the preparation method of above-mentioned brake pipe joint, 520- is first warming up to 7-10 DEG C/min speed in heat treatment
540 DEG C, then 780-860 DEG C is warming up to 5-8 DEG C/min speed, 980-1050 is then risen to 8-15 DEG C/min speed
℃。
In the preparation method of above-mentioned brake pipe joint, the composition and ratio of electroplate liquid are Cr in pulse plating2O3:180-
220g/L, H2SO4：1.5-2.0g/L, surplus is deionized water.
Brake pipe joint made from the preparation method of brake pipe joint of the present invention includes head, pars intermedia and passes through centre
The afterbody that portion is connected with head, head, pars intermedia and afterbody are hollow tubular and connection of interpenetrating, and pars intermedia connects with head
The one end connect is horn opening, and the angle of horn opening is 100-160 °.
Preferably, pars intermedia is connected the opening of one end with afterbody directly through being less than afterbody internal diameter, again smaller than head internal diameter.
The electroplating surface of brake pipe joint has 5-20 μm of zinc coat described in described brake pipe joint.
Compared with prior art, the preparation method simple possible of brake pipe joint of the present invention, passes through rationally matching somebody with somebody for each composition
5 and the reasonable set of technological parameter, the dual heat treatment that quenching increases temperature tempering is first passed through, then by pulse plating
Method, forms corrosion-resistant, wear-resisting chromium coating on brake pipe joint surface, eliminates annealing process step, and increase substantially
The performances such as the hardness of brake pipe joint, intensity, corrosion resistance, temperature tolerance.
Brief description of the drawings
Fig. 1 is the structural representation of brake pipe joint of the present invention.
In figure, 1, head；2nd, pars intermedia；3rd, afterbody；4th, horn opening.
Embodiment
The following is the specific embodiment combination accompanying drawing of the present invention, technical scheme is further described, but
The present invention is not limited to these embodiments.
Embodiment 1
Raw material is made steel：By the composition and mass percent dispensing of brake pipe joint：C：0.19%th, Si：0.10%th, Mn：
0.90%th, B：0.12%th, Ti：0.055%th, Al：0.25%th, Mo：0.72%th, V：0.20%th, Nb：0.08%th, La：0.015%th,
P≤0.02%, S≤0.02%, surplus are Fe, and are smelted into molten steel at 1320 DEG C, and molten steel is through smelting, using argon envelope full guard
Cast, and it is rolled into steel plate；Start rolling temperature is 1000 DEG C in rolling, and final rolling temperature is 900 DEG C, and laying temperature is 860 DEG C, collection volume
Temperature is 750 DEG C；
It is cold extrusion shaped：Steel are carried out to surface acid-washing derusting, lime stone coating, phosphorating treatment, then cold extrusion successively
It is molded to obtain brake pipe joint blank；
Heat treatment：Brake pipe joint blank is first warming up to 530 DEG C with 8 DEG C/min speed, then with 6 DEG C/min speed
820 DEG C are warming up to, then rising to 1020 DEG C with 10 DEG C/min speed carries out Quenching Treatment with quenching oil, is incubated 2 hours, then
In 380 DEG C of tempers, 1.5 hours are incubated, brake pipe joint semi-finished product are obtained；
Electrodeposited chromium layers：The brake pipe that brake pipe joint semi-finished product are made into surface by pulse plating 12 μm of chrome platings connects
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.4Hz, current density 65A/dm2, bath temperature is 53 DEG C；Electricity
The composition and ratio of plating solution are Cr2O3:180-220g/L, H2SO4：1.5-2.0g/L, surplus is deionized water.
Embodiment 2
Raw material is made steel：By the composition and mass percent dispensing of brake pipe joint：C：0.18%th, Si：0.08%th, Mn：
1.00%th, B：0.01%th, Ti：0.06%th, Al：0.22%th, Mo：0.68%th, V：0.22%th, Nb：0.05%th, La：0.012%th, P
≤ 0.02%, S≤0.02%, surplus is Fe, and is smelted into molten steel at 1340 DEG C, and molten steel is through smelting, using argon envelope full guard
Cast, and it is rolled into steel plate；Start rolling temperature is 990 DEG C in rolling, and final rolling temperature is 890 DEG C, and laying temperature is 870 DEG C, collection volume
Temperature is 755 DEG C；
It is cold extrusion shaped：Steel are carried out to surface acid-washing derusting, lime stone coating, phosphorating treatment, then cold extrusion successively
It is molded to obtain brake pipe joint blank；
Heat treatment：Brake pipe joint blank is first warming up to 535 DEG C with 9 DEG C/min speed, then with 6 DEG C/min speed
800 DEG C are warming up to, then rising to 1040 DEG C with 12 DEG C/min speed carries out Quenching Treatment with quenching oil, is incubated 2.5 hours, so
Afterwards in 360 DEG C of tempers, 2 hours are incubated, brake pipe joint semi-finished product are obtained；
Electrodeposited chromium layers：The brake pipe that brake pipe joint semi-finished product are made into surface by pulse plating 15 μm of chrome platings connects
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.4Hz, current density 66A/dm2, bath temperature is 54 DEG C；Electricity
The composition and ratio of plating solution are Cr2O3:180-220g/L, H2SO4：1.5-2.0g/L, surplus is deionized water.
Embodiment 3
Raw material is made steel：By the composition and mass percent dispensing of brake pipe joint：C：0.18%th, Si：0.11%th, Mn：
0.88%th, B：0.08%th, Ti：0.05-0.06%, Al：0.28%th, Mo：0.75%th, V：0.18%th, Nb：0.008-0.14%,
La：0.018%th, P≤0.02%, S≤0.02%, surplus is Fe, and is smelted into molten steel at 1310 DEG C, and molten steel is through smelting, adopting
Poured into a mould with argon envelope full guard, and be rolled into steel plate；Start rolling temperature is 1010 DEG C in rolling, and final rolling temperature is 905 DEG C, laying temperature
For 855 DEG C, collection volume temperature is 745 DEG C；
It is cold extrusion shaped：Steel are carried out to surface acid-washing derusting, lime stone coating, phosphorating treatment, then cold extrusion successively
It is molded to obtain brake pipe joint blank；
Heat treatment：Brake pipe joint blank is first warming up to 525 DEG C with 8 DEG C/min speed, then with 7 DEG C/min speed
850 DEG C are warming up to, then rising to 990 DEG C with 9 DEG C/min speed carries out Quenching Treatment with quenching oil, is incubated 1.5 hours, then
In 400 DEG C of tempers, 1 hour is incubated, brake pipe joint semi-finished product are obtained；
Electrodeposited chromium layers：The brake pipe that brake pipe joint semi-finished product are made into surface by pulse plating 8 μm of chrome platings connects
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.3Hz, current density 62A/dm2, bath temperature is 52 DEG C；Electricity
The composition and ratio of plating solution are Cr2O3:180-220g/L, H2SO4：1.5-2.0g/L, surplus is deionized water.
Embodiment 4
Raw material is made steel：By the composition and mass percent dispensing of brake pipe joint：C：0.20%th, Si：0.05%th, Mn：
1.10%th, B：0.005%th, Ti：0.08%th, Al：0.12%th, Mo：0.8%th, V：0.15%th, Nb：0.02%th, La：0.008%th, P
≤ 0.02%, S≤0.02%, surplus is Fe, and is smelted into molten steel at 1350 DEG C, and molten steel is through smelting, using argon envelope full guard
Cast, and it is rolled into steel plate；Start rolling temperature is 1020 DEG C in rolling, and final rolling temperature is 910 DEG C, and laying temperature is 880 DEG C, collection volume
Temperature is 760 DEG C；
It is cold extrusion shaped：Steel are carried out to surface acid-washing derusting, lime stone coating, phosphorating treatment, then cold extrusion successively
It is molded to obtain brake pipe joint blank；
Heat treatment：Brake pipe joint blank is first warming up to 540 DEG C with 10 DEG C/min speed, then with 8 DEG C/min speed
Rate is warming up to 860 DEG C, and then rising to 1050 DEG C with 15 DEG C/min speed carries out Quenching Treatment with quenching oil, is incubated 1 hour, so
Afterwards in 420 DEG C of tempers, 1 hour is incubated, brake pipe joint semi-finished product are obtained；
Electrodeposited chromium layers：The brake pipe that brake pipe joint semi-finished product are made into surface by pulse plating 20 μm of chrome platings connects
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.5Hz, current density 68A/dm2, bath temperature is 55 DEG C；Electricity
The composition and ratio of plating solution are Cr2O3:180-220g/L, H2SO4：1.5-2.0g/L, surplus is deionized water.
Embodiment 5
Raw material is made steel：By the composition and mass percent dispensing of brake pipe joint：C：0.15%th, Si：0.20%th, Mn：
0.80%th, B：0.02%th, Ti：0.04%th, Al：0.35%th, Mo：0.6%th, V：0.25%th, Nb：0.005%th, La：0.02%th, P
≤ 0.02%, S≤0.02%, surplus is Fe, and is smelted into molten steel at 1300 DEG C, and molten steel is through smelting, using argon envelope full guard
Cast, and it is rolled into steel plate；Start rolling temperature is 980 DEG C in rolling, and final rolling temperature is 880 DEG C, and laying temperature is 850 DEG C, collection volume
Temperature is 740 DEG C；
It is cold extrusion shaped：Steel are carried out to surface acid-washing derusting, lime stone coating, phosphorating treatment, then cold extrusion successively
It is molded to obtain brake pipe joint blank；
Heat treatment：Brake pipe joint blank is first warming up to 520 DEG C with 7 DEG C/min speed, then with 5 DEG C/min speed
780 DEG C are warming up to, then rising to 980 DEG C with 8 DEG C/min speed carries out Quenching Treatment with quenching oil, is incubated 3 hours, Ran Hou
350 DEG C of tempers, are incubated 2 hours, obtain brake pipe joint semi-finished product；
Electrodeposited chromium layers：The brake pipe that brake pipe joint semi-finished product are made into surface by pulse plating 5 μm of chrome platings connects
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.2Hz, current density 60A/dm2, bath temperature is 50 DEG C；Electricity
The composition and ratio of plating solution are Cr2O3:180-220g/L, H2SO4：1.5-2.0g/L, surplus is deionized water.
As shown in figure 1, a kind of brake pipe joint, described brake pipe joint includes head 1, pars intermedia 2 and in
Between the afterbody 3 that is connected with head 1 of portion 2, head 1, pars intermedia 2 and afterbody 3 are that hollow tubular and interpenetrating is connected, pars intermedia
2 one end being connected with head 1 are horn opening 4, and the angle of horn opening 4 is 100-160 °.Pars intermedia 2 connects with afterbody 3
The opening of one end is connect directly through being less than afterbody internal diameter, again smaller than head internal diameter.
Comparative example 1
Common commercially available brake pipe joint in the prior art.
Comparative example 2
The brake pipe joint as shown in Figure 1 being made up using common alloy steel of common alloy steel processing technology.
Comparative example 3
Brake pipe joint as shown in Figure 1 is made by the preparation method in such as embodiment 1 using common alloy steel.
Comparative example 4
Added using the component and its mass percent of brake pipe joint as described in example 1 above by common alloy steel
The brake pipe joint as shown in Figure 1 that work technique is made.
The technique that explanation is not known in the above-described embodiments is the technique of normal conventional in the prior art, such as smelts, pours
Note, surface acid-washing derusting, lime stone coating, phosphorating treatment etc..
Brake pipe joint in embodiment 1-5 and comparative example 1-4 is subjected to performance test, test result is as shown in table 1.
Table 1：The performance test of brake pipe joint in embodiment 1-5 and comparative example 1-4
In summary, the preparation method simple possible of brake pipe joint of the present invention, by the reasonable compatibility of each composition and
The reasonable set of technological parameter, first passes through the dual heat treatment that quenching increases temperature tempering, then by the method for pulse plating,
Brake pipe joint surface forms corrosion-resistant, wear-resisting chromium coating, eliminates annealing process step, and brake pipe is greatly improved
The performances such as hardness, intensity, corrosion resistance, the temperature tolerance of joint.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be substituted using similar mode, but simultaneously
Do not deviate by the spirit of the present invention or surmount scope defined in appended claims.
Claims (9)
1. a kind of preparation method of brake pipe joint, it is characterised in that described preparation method comprises the following steps：
Raw material is made steel：By the mass percent dispensing of brake pipe joint composition, molten steel is smelted into, molten steel is through smelting, pouring into a mould, rolling
Into steel plate；
It is cold extrusion shaped：Steel are carried out to surface acid-washing derusting, lime stone coating, phosphorating treatment successively, it is then cold extrusion shaped
Obtain brake pipe joint blank；
Heat treatment：Brake pipe joint blank is first to heat to 520-540 DEG C, 780-860 DEG C is then heated to, is again heated to 980-
1050 DEG C carry out Quenching Treatment with quenching oil, are incubated 1-3 hours, then in 350-420 DEG C of temper, are incubated 1-2 hours, obtain
Brake pipe joint semi-finished product；
Electrodeposited chromium layers：Brake pipe joint semi-finished product are made into surface by pulse plating the brake pipe joint of chrome plating, wherein
Pulse frequency is 3.2-3.5Hz, current density 60-68A/dm2, bath temperature is 50-55 DEG C.
2. the preparation method of brake pipe joint according to claim 1, it is characterised in that the composition of the brake pipe joint
And mass percent is：C：0.15-0.20%, Si：0.05-0.20%, Mn：0.80-1.10%, B：0.005-0.02%, Ti：
0.04-0.08%, Al：0.12-0.35%, Mo：0.6-0.8%, V：0.15-0.25%, Nb：0.005-0.02%, La：
0.008-0.02%, P≤0.02%, S≤0.02%, surplus is Fe.
3. the preparation method of brake pipe joint according to claim 1, it is characterised in that the temperature of the melting is
1300-1350℃。
4. the preparation method of brake pipe joint according to claim 1, it is characterised in that start rolling temperature is 980- in rolling
1020 DEG C, final rolling temperature is 880-910 DEG C, and laying temperature is 850-880 DEG C, integrates volume temperature as 740-760 DEG C.
5. the preparation method of brake pipe joint according to claim 1, it is characterised in that in heat treatment first with 7-10 DEG C/
Min speed is warming up to 520-540 DEG C, then is warming up to 780-860 DEG C with 5-8 DEG C/min speed, then with 8-15 DEG C/min
Speed rise to 980-1050 DEG C.
6. the preparation method of brake pipe joint according to claim 1, it is characterised in that during pulse plating electroplate liquid into
Divide and ratio is Cr2O3:180-220g/L, H2SO4：1.5-2.0g/L, surplus is deionized water.
7. according to the preparation method of any described brake pipe joints of claim 1-6, it is characterised in that described brake pipe connects
Head includes head, pars intermedia and the afterbody being connected by pars intermedia with head, and head, pars intermedia and afterbody are hollow tubular
And connection of interpenetrating, one end that pars intermedia is connected with head is horn opening, and the angle of horn opening is 100-160 °.
8. the preparation method of brake pipe joint according to claim 7, it is characterised in that pars intermedia is connected one end with afterbody
Opening directly through be less than afterbody internal diameter, again smaller than head internal diameter.
9. according to the preparation method of any described brake pipe joints of claim 1-6, it is characterised in that described brake pipe connects
The electroplating surface of head has 5-20 μm of chromium coating.
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| CN110923794B (en) * | 2019-12-30 | 2020-12-15 | 温州拓日工业设计有限公司 | Small-size environmental protection sealing barrel-plating device |
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| CN104694835A (en) * | 2008-11-26 | 2015-06-10 | 新日铁住金株式会社 | Seamless steel pipe and method for manufacturing same |
| CN101928873A (en) * | 2010-08-26 | 2010-12-29 | 姚圣法 | Method for processing high-strength and ultrahigh-strength steel plates |
| CN102392181B (en) * | 2011-11-11 | 2013-01-23 | 江苏华程工业制管股份有限公司 | Alloy steel, seamless steel pipe and heat treatment technology of shaped steel pipe |
| JP5799819B2 (en) * | 2012-01-13 | 2015-10-28 | 新日鐵住金株式会社 | Method for producing hot-dip galvanized steel sheet with excellent plating wettability and pick-up resistance |
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