CN106282764A - 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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- CN106282764A CN106282764A CN201610661494.7A CN201610661494A CN106282764A CN 106282764 A CN106282764 A CN 106282764A CN 201610661494 A CN201610661494 A CN 201610661494A CN 106282764 A CN106282764 A CN 106282764A
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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
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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
- 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 the preparation method of a kind of brake pipe joint, belong to alloy material processing technique field.This preparation method is: dispensing, melting, smelts, pour into a mould, be rolled into steel plate；Steel are carried out successively surface acid-washing rust cleaning, limestone coating, bonderizing, the most cold extrusion shaped the brake pipe joint blank；Brake pipe joint blank is first to heat to 520 540 DEG C, is then heated to 780 860 DEG C, be again heated to 980 1050 DEG C and carry out Quenching Treatment with quenching oil, be incubated 13 hours, then 350 420 DEG C of temper, be incubated 12 hours, obtain brake pipe joint semi-finished product；Brake pipe joint semi-finished product are prepared surface through pulse plating and has the brake pipe joint of chrome plating.Brake pipe joint of the present invention uses cold-forging steel to make, and is increased temperature the dual heat treatment of tempering, then pulse plating by first quenching, improves the performances such as the hardness of brake pipe joint, intensity, corrosion resistance, temperature tolerance.
Description
Technical field
The present invention relates to the preparation method of a kind of brake pipe joint, belong to alloy material processing technique field.
Background technology
Lasting, fast-developing along with national economy, improving constantly of living standards of the people, since two thousand two China's vapour
Car consumption market there occurs great variety.Private Car Consumption market blowout especially increases.In the face of day by day fierce market
Competition, what automobile component part supply business was the most growing with each passing hour constantly researches and develops more safe and efficient auto parts and components.
Vehicle structure is mainly made up of electromotor, chassis, electrical equipment, vehicle body；Wherein, electromotor be automobile power dress
Put, 2 great institutions 5 be greatly to form: toggle, valve actuating mechanism, cooling system, fuel supply system, lube system, igniting system,
Start system's composition.Wherein, brake pipe joint to ensure wear-resisting, media-resistant, resistance to oxidation, corrosion-resistant and feature of waiting so long service life.
Brake pipe joint of the prior art is many 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 male joint,
One female joint, and a clamping close device, but, zero adnexa quantity within each main element is too much, simplifies not, in cost benefit
On do not have competition benefit.During additionally, existing brake is intended to assemble with car body (not shown), it is necessary to by the public access on brake
Head, female joint separate in advance, but in the process, female joint will produce oil leakage phenomenon.And existing brake pipe joint adopts more
Made by conventional processing method with conventional steel alloy, its wearability, media-resistant, resistance to oxidation, corrosion-resistant more typically, because of
This brake pipe joint is either in performance especially wearability, sealing, or all has much room for improvement service life.
Summary of the invention
It is an object of the invention to provide a kind of prepare that case hardness is high, intensity high, wearability is good, the stopping of good corrosion resistance
The preparation method of car pipe joint.
The purpose of the present invention can be realized by following technical proposal: the preparation method of a kind of brake pipe joint, described
Preparation method comprises the steps:
Raw material make steel: by the mass percent dispensing of brake pipe joint composition, be smelted into molten steel, molten steel through smelt, cast,
It is rolled into steel plate；
Cold extrusion shaped: steel are carried out successively surface acid-washing rust cleaning, limestone coating, bonderizing, then cold extrusion
Molding obtains brake pipe joint blank；
Heat treatment: brake pipe joint blank is first to heat to 520-540 DEG C, is then heated to 780-860 DEG C, be again heated to
980-1050 DEG C carries out Quenching Treatment with quenching oil, is incubated 1-3 hour, and then 350-420 DEG C of temper, 1-2 is little in insulation
Time, obtain brake pipe joint semi-finished product；
Electrodeposited chromium layers: through pulse plating, brake pipe joint semi-finished product are prepared surface the brake pipe joint of chrome plating,
Wherein pulse frequency is 3.2-3.5Hz, electric 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 quenching after cold extrusion shaped and increases temperature the dual heat of tempering
Process, be then passed through pulse plating, form corrosion-resistant, wear-resisting chromium coating on brake pipe joint surface.Quenching of brake pipe joint
Fire increases temperature the dual heat treatment of tempering can make brake pipe joint have good comprehensive mechanical performance.
Using pulse plating, when current lead-through, near cathode surface, the metal ion in liquid is by fast deposition；Electric current
During shutoff, the plated metal ion in bulk electrolysis liquid spreads to nearly cathode chamber, the metal made near cathode surface in liquid from
The concentration of son is restored.Therefore pulse plating has the ability of preferable smooth coating, and be easy to get smooth bright coating.Arteries and veins
Punching plating is different from direct current electrode position, the variable of the latter's only one of which independence, i.e. electric current density；And the independent variable of pulse plating has
3, i.e. pulse frequency, dutycycle and electric current density.And pulse frequency greatly affects the micromorphology of chromium coating, typically
Pulse frequency be 3.0Hz, and when frequency higher or lower than 3.0Hz time, all will affect the microcosmic appearance quality of chrome plating, reduction
Plated layer compact degree, the tendentiousness cracked increases, and surface roughness raises.Its reason is when frequency is too high, at next
When individual ON time arrives, the concentration of metal ions near negative electrode fails to recover in when off, with plating reduction reaction
Persistently carrying out, the metal ion near negative electrode gradually uses up, the concentration of metal ions at this and the concentration of metal ions in plating solution
Concentration polarization occur, and continue to increase, cause metal ion to move to cathode surface insufficient, the crystal promoting cathode surface is raw
Long speed forms speed more than it, 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 when pulse plating and cold extrusion shaped has increased temperature through quenching again
The dual heat treatment of tempering, the most to a certain degree have impact on the tissue on brake pipe joint surface, now needs higher pulse frequency
Rate affects 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, reduces coating surface roughness, increases the consistency of sedimentary, reduces the shape of micro-crack
Become.Through constantly testing discovery, at 50-55 DEG C, pulse frequency is controlled at 3.2-3.5Hz, electric current density 60-68A/dm2, can
Obtain crystal grain tiny, dense structure, the low and flawless chromium coating of surface roughness, and then improve the wear-resisting of brake pipe joint
Property, temperature tolerance, corrosion resistance.
It addition, there will be post-curing effect when high tempering.Along with the rising of temperature, the intensity of steel, hardness
Reducing, plasticity, toughness raise.Because containing elements such as Mo, Ti, V, Nb in brake pipe joint raw material of the present invention, improve steel
Resistance to tempering；Separating out alloy carbide when 380 DEG C of temperatures above tempering and produce post-curing, intensity and hardness are with tempering temperature
The liter High variation of degree is little；But when temperature greater than about 450 DEG C, intensity and hardness drastically decline；Same molten strengthening at C atom
Act under the common effect that the dispersion-strengthened action with alloying element that fades away gradually is strengthened, along with the rising of temperature,
Plasticity change is little, and toughness is not affected by dispersion-strengtherning effect, so increasing substantially.And the raising of hardening heat, this
The brake pipe joint of invention is by grain coarsening and the combined influence of post-curing effect, and its intensity and scale of hardness reveal falls after rising
Trend, intensity by be raised to fall critical austenite temperature be about 1000 DEG C, plasticity and toughness are gradually reduced, and toughness decline
Speed.
In the preparation method of above-mentioned brake pipe joint, the component of described brake pipe joint and mass percent be:
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.
The steel alloy of brake pipe joint of the present invention is cold-forging steel, in this cold-forging steel, if carbon content is too low, in preparation process
In heat treatment after can have a strong impact on intensity and the hardness of cold-forging steel, if carbon content is higher, then plasticity is low, in Cold Extrusion Process
Extremely cause cracking.In cold-forging steel of the present invention, add appropriate Si can improve the intensity of cold forging steel, if Si content is less than
0.05%, the yield strength of brake pipe joint can be affected.Although Mn is solution strengthening element, but at the steel alloy of brake pipe joint
In, as Fe content is too high, more than 1.1%, then plasticity and the toughness of brake pipe joint can be greatly lowered.Ti is at brake pipe joint
Steel alloy in can improve the strength and toughness of steel, the harm of nitrogen in steel element particularly with fixed nitrogen, can be eliminated.Connect at brake pipe
The Al adding 0.12-0.35% in the steel alloy of head makees strong deoxidizer, reduces the oxygen content in steel, improves the matter of brake pipe joint
Amount.
The steel alloy of brake pipe joint of the present invention adds 0.005-0.02%B, in order to improve compactness and the heat of steel
Roll performance, improve the intensity of brake pipe joint.Because the steel alloy of brake pipe joint of the present invention being added with appropriate B, therefore
Without making annealing treatment in preparation process of the present invention.Although boron-containing cold heading steel has, quenching degree is good, the feature of low cost, but due to
Boron element is a sensitive elements, and its composition range needs preferably to determine.If Boron contents is too low, do not reach raising steel through hardening
The effect of property；If Boron contents is too high, can make again steel embrittlement, steel the most easily crack.If it addition, added
Boron element in steel is oxidized or nitrogenizes, and boron all can be made to lose quenching degree, and therefore boron-containing cold heading steel will be with the 0.12-added
0.35% aluminum produces synergism, prevents boron oxidized, is simultaneously introduced 0.04-0.08%Ti and prevents boron element from being nitrogenized.
The steel alloy of brake pipe joint of the present invention has been simultaneously introduced can Mo, Nb, V of crystal grain thinning, dispersion-strengtherning, three
Add while kind of element, and and other components between proportioning, the useful work between each element and element thereof can be made
With bringing into play substantially simultaneously, increase substantially the intensity of steel alloy, hardness, corrosion resistance, wearability.Wherein, add
0.6-0.8%Mo, makes crystalline grain of steel refine, and improves quenching degree and thermostrength, the fragility that suppression steel alloy causes due to quenching, goes back
Can keep enough intensity and creep resisting ability when high temperature, intrinsic creep strength is arranged with C atom pair concentration by Mo, Mn,
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.Add 0.15-0.25%V thinning microstructure crystal grain, improve intensity and tough
Property.Vanadium is not only strengthening compound and is formed element, or the deoxidizer that steel are excellent, can form high-melting-point, height firmly with the combination of carbon
Degree, high diffusive degree and stable VC carbide, and Ti, V and Mn element play synergism, the common intensity improving steel and hardness,
Its reason is that Ti, V and Mn are with the use of being possible not only to crystal grain thinning, it is also possible to obtain the Dispersed precipitate analysis of more high-volume fractional
Go out granule, simultaneously work as the effect of refined crystalline strengthening and dispersion-strengtherning, it is also possible to improve the intensity of brake pipe joint, toughness and resist
Corrosive power.
It addition, brake pipe joint steel alloy of the present invention there was added 0.008-0.02%La, the La existence in carbon junction steel
Form has rare-earth sulfide, rare-earth oxide sulfate, solid solution and rare earth intermetallic compound, and wherein rare-earth sulfide, solid solution are with dilute
The unstable chemcial property of compound between earth metal, very soluble in corrosive medium, discharges rare earth La3+And at cathode zone
Precipitate thus slow down the carrying out of corrosion.Adding rare earth in carbon junction steel and make the negative shifting of steel corrosion current potential, corrosion current density reduces, cloudy
Pole reaction is hindered, and corrosion resisting property is improved, and adds the rare earth element in steel and serves the effect of cathodic corrosion inhibitor.Along with
Increase its rusty scale thickness reduction of content of rare earth is caused.Charge migration resistance is directly related with the corrosion rate of steel matrix,
The increase of charge migration resistance shows the increase along with content of rare earth, and the extent of corrosion of steel matrix alleviates, and corrosion resisting property is carried
High.
In steel, the impurity element such as sulfur, phosphorus directly affects brake pipe joint cold-forging steel cold heading performance.Smelting at cold-forging steel
Journey should remove corresponding impurity for different steel grades.Some nonmetal inclusion destroys the matrix seriality of steel, in dead load and
Under the effect of dynamic loading, often become the starting point of cold-forging steel crackle.Therefore, nonmetallic inclusionsin steel should be reduced as far as possible, reduce
Its harm in steel.
As preferably, the component of described brake pipe joint and mass percent be: 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 described melting is 1300-1350 DEG C.
In the preparation method of above-mentioned brake pipe joint, in rolling, start rolling temperature is 980-1020 DEG C, 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, first with the ramp of 7-10 DEG C/min to 520-in heat treatment
540 DEG C, then with the ramp of 5-8 DEG C/min to 780-860 DEG C, then rise to 980-1050 with the speed of 8-15 DEG C/min
℃。
In the preparation method of above-mentioned brake pipe joint, in pulse plating, composition and the ratio of electroplate liquid are Cr2O3:180-
220g/L, H2SO4: 1.5-2.0g/L, surplus is deionized water.
The brake pipe joint that the preparation method of brake pipe joint of the present invention prepares includes head, pars intermedia and passes through centre
The afterbody that portion is connected with head, head, pars intermedia be hollow tubular and interpenetrating and be connected with afterbody, and pars intermedia is with head even
The one end connect is horn opening, and the angle of horn opening is 100-160 °.
As preferably, the opening that pars intermedia is connected one end with afterbody is straight through less than afterbody internal diameter, again smaller than head internal diameter.
Described in described brake pipe joint, the electroplating surface of brake pipe joint has the zinc coat of 5-20 μm.
Compared with prior art, the preparation method simple possible of brake pipe joint of the present invention, by the Reasonable of each composition
5 and the reasonable set of technological parameter, first passing through quenching and increasing temperature the dual heat treatment of tempering, being then passed through pulse plating
Method, forms corrosion-resistant, wear-resisting chromium coating on brake pipe joint surface, eliminates annealing process step, and increases substantially
The performances such as the hardness of brake pipe joint, intensity, corrosion resistance, temperature tolerance.
Accompanying drawing explanation
Fig. 1 is the structural representation of brake pipe joint of the present invention.
In figure, 1, head；2, pars intermedia；3, afterbody；4, horn opening.
Detailed description of the invention
The specific embodiment that the following is the present invention combines accompanying drawing, is further described technical scheme, but
The present invention is not limited to these embodiments.
Embodiment 1
Raw material is made steel: by composition and the mass percent dispensing of brake pipe joint: C:0.19%, Si:0.10%, Mn:
0.90%, B:0.12%, Ti:0.055%, Al:0.25%, Mo:0.72%, V:0.20%, Nb:0.08%, La:0.015%,
P≤0.02%, S≤0.02%, surplus is Fe, and is smelted into molten steel at 1320 DEG C, and molten steel is through smelting, use argon envelope full guard
Cast, and it is rolled into steel plate；In rolling, start rolling temperature is 1000 DEG C, and final rolling temperature is 900 DEG C, and laying temperature is 860 DEG C, collection volume
Temperature is 750 DEG C；
Cold extrusion shaped: steel are carried out successively surface acid-washing rust cleaning, limestone coating, bonderizing, then cold extrusion
Molding obtains brake pipe joint blank；
Heat treatment: by brake pipe joint blank first with the ramp of 8 DEG C/min to 530 DEG C, then the speed with 6 DEG C/min
It is warming up to 820 DEG C, then rises to 1020 DEG C with the speed of 10 DEG C/min and carry out Quenching Treatment with quenching oil, be incubated 2 hours, then
380 DEG C of temper, it is incubated 1.5 hours, obtains brake pipe joint semi-finished product；
Electrodeposited chromium layers: through pulse plating, brake pipe joint semi-finished product are prepared surface has the brake pipe of 12 μm chrome platings to connect
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.4Hz, electric current density 65A/dm2, bath temperature is 53 DEG C；Electricity
The composition of plating solution and ratio are Cr2O3: 180-220g/L, H2SO4: 1.5-2.0g/L, surplus is deionized water.
Embodiment 2
Raw material is made steel: by composition and the mass percent dispensing of brake pipe joint: C:0.18%, Si:0.08%, Mn:
1.00%, B:0.01%, Ti:0.06%, Al:0.22%, Mo:0.68%, V:0.22%, Nb:0.05%, La:0.012%, 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, use argon envelope full guard
Cast, and it is rolled into steel plate；In rolling, start rolling temperature is 990 DEG C, and final rolling temperature is 890 DEG C, and laying temperature is 870 DEG C, collection volume
Temperature is 755 DEG C；
Cold extrusion shaped: steel are carried out successively surface acid-washing rust cleaning, limestone coating, bonderizing, then cold extrusion
Molding obtains brake pipe joint blank；
Heat treatment: by brake pipe joint blank first with the ramp of 9 DEG C/min to 535 DEG C, then the speed with 6 DEG C/min
It is warming up to 800 DEG C, then rises to 1040 DEG C with the speed of 12 DEG C/min and carry out Quenching Treatment with quenching oil, be incubated 2.5 hours, so
After 360 DEG C of temper, be incubated 2 hours, obtain brake pipe joint semi-finished product；
Electrodeposited chromium layers: through pulse plating, brake pipe joint semi-finished product are prepared surface has the brake pipe of 15 μm chrome platings to connect
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.4Hz, electric current density 66A/dm2, bath temperature is 54 DEG C；Electricity
The composition of plating solution and ratio are Cr2O3: 180-220g/L, H2SO4: 1.5-2.0g/L, surplus is deionized water.
Embodiment 3
Raw material is made steel: by composition and the mass percent dispensing of brake pipe joint: C:0.18%, Si:0.11%, Mn:
0.88%, B:0.08%, Ti:0.05-0.06%, Al:0.28%, Mo:0.75%, V:0.18%, Nb:0.008-0.14%,
La:0.018%, 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
Pour into a mould by argon envelope full guard, and be rolled into steel plate；In rolling, start rolling temperature is 1010 DEG C, and final rolling temperature is 905 DEG C, laying temperature
Being 855 DEG C, collection volume temperature is 745 DEG C；
Cold extrusion shaped: steel are carried out successively surface acid-washing rust cleaning, limestone coating, bonderizing, then cold extrusion
Molding obtains brake pipe joint blank；
Heat treatment: by brake pipe joint blank first with the ramp of 8 DEG C/min to 525 DEG C, then the speed with 7 DEG C/min
It is warming up to 850 DEG C, then rises to 990 DEG C with the speed of 9 DEG C/min and carry out Quenching Treatment with quenching oil, be incubated 1.5 hours, then
400 DEG C of temper, it is incubated 1 hour, obtains brake pipe joint semi-finished product；
Electrodeposited chromium layers: through pulse plating, brake pipe joint semi-finished product are prepared surface has the brake pipe of 8 μm chrome platings to connect
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.3Hz, electric current density 62A/dm2, bath temperature is 52 DEG C；Electricity
The composition of plating solution and ratio are Cr2O3: 180-220g/L, H2SO4: 1.5-2.0g/L, surplus is deionized water.
Embodiment 4
Raw material is made steel: by composition and the mass percent dispensing of brake pipe joint: C:0.20%, Si:0.05%, Mn:
1.10%, B:0.005%, Ti:0.08%, Al:0.12%, Mo:0.8%, V:0.15%, Nb:0.02%, La:0.008%, 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, use argon envelope full guard
Cast, and it is rolled into steel plate；In rolling, start rolling temperature is 1020 DEG C, and final rolling temperature is 910 DEG C, and laying temperature is 880 DEG C, collection volume
Temperature is 760 DEG C；
Cold extrusion shaped: steel are carried out successively surface acid-washing rust cleaning, limestone coating, bonderizing, then cold extrusion
Molding obtains brake pipe joint blank；
Heat treatment: by brake pipe joint blank first with the ramp of 10 DEG C/min to 540 DEG C, then the speed with 8 DEG C/min
Rate is warming up to 860 DEG C, then rises to 1050 DEG C with the speed of 15 DEG C/min and carries out Quenching Treatment with quenching oil, is incubated 1 hour, so
After 420 DEG C of temper, be incubated 1 hour, obtain brake pipe joint semi-finished product；
Electrodeposited chromium layers: through pulse plating, brake pipe joint semi-finished product are prepared surface has the brake pipe of 20 μm chrome platings to connect
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.5Hz, electric current density 68A/dm2, bath temperature is 55 DEG C；Electricity
The composition of plating solution and ratio are Cr2O3: 180-220g/L, H2SO4: 1.5-2.0g/L, surplus is deionized water.
Embodiment 5
Raw material is made steel: by composition and the mass percent dispensing of brake pipe joint: C:0.15%, Si:0.20%, Mn:
0.80%, B:0.02%, Ti:0.04%, Al:0.35%, Mo:0.6%, V:0.25%, Nb:0.005%, La:0.02%, 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, use argon envelope full guard
Cast, and it is rolled into steel plate；In rolling, start rolling temperature is 980 DEG C, and final rolling temperature is 880 DEG C, and laying temperature is 850 DEG C, collection volume
Temperature is 740 DEG C；
Cold extrusion shaped: steel are carried out successively surface acid-washing rust cleaning, limestone coating, bonderizing, then cold extrusion
Molding obtains brake pipe joint blank；
Heat treatment: by brake pipe joint blank first with the ramp of 7 DEG C/min to 520 DEG C, then the speed with 5 DEG C/min
It is warming up to 780 DEG C, then rises to 980 DEG C with the speed of 8 DEG C/min and carry out Quenching Treatment with quenching oil, be incubated 3 hours, then exist
350 DEG C of temper, are incubated 2 hours, obtain brake pipe joint semi-finished product；
Electrodeposited chromium layers: through pulse plating, brake pipe joint semi-finished product are prepared surface has the brake pipe of 5 μm chrome platings to connect
Head, brake pipe joint is as shown in Figure 1.Wherein pulse frequency is 3.2Hz, electric current density 60A/dm2, bath temperature is 50 DEG C；Electricity
The composition of plating solution and ratio are Cr2O3: 180-220g/L, H2SO4: 1.5-2.0g/L, surplus is deionized water.
As it is shown in figure 1, a kind of brake pipe joint, during described brake pipe joint includes head 1, pars intermedia 2 and passes through
Between the afterbody 3 that is connected with head 1 of portion 2, head 1, pars intermedia 2 be hollow tubular and interpenetrating and be connected with afterbody 3, 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 is with afterbody 3 even
The opening connecing one end is straight through less than afterbody internal diameter, again smaller than head internal diameter.
Comparative example 1
Brake pipe joint the most commercially available in prior art.
Comparative example 2
Use the brake pipe joint as shown in Figure 1 that common alloy steel is made by common alloy steel processing technique.
Comparative example 3
Common alloy steel is used to make brake pipe joint as shown in Figure 1 by such as the preparation method in embodiment 1.
Comparative example 4
The component and the mass percent thereof that use brake pipe joint as described in example 1 above are added by common alloy steel
The brake pipe joint as shown in Figure 1 that work technique is made.
The technique not clearly stated in the above-described embodiments is the technique of normal conventional in prior art, as smelted, watering
Note, surface acid-washing rust cleaning, limestone coating, bonderizing etc..
Brake pipe joint in embodiment 1-5 and comparative example 1-4 is carried out performance test, and 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 sum, 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 passing through quenching and increasing temperature the dual heat treatment of tempering, the method being then passed through 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 the hardness of joint, intensity, corrosion resistance, temperature tolerance.
Specific embodiment described herein is only to present invention spirit explanation for example.Technology neck belonging to the present invention
Described specific embodiment can be made various amendment or supplements or use similar mode to substitute by the technical staff in territory, but also
Do not deviate by the spirit of the present invention or surmount scope defined in appended claims.
Claims (10)
1. the preparation method of a brake pipe joint, it is characterised in that described preparation method comprises the steps:
Raw material is made steel: by the mass percent dispensing of brake pipe joint composition, being smelted into molten steel, molten steel is through smelting, pour into a mould, rolling
Become steel plate；
Cold extrusion shaped: steel are carried out successively surface acid-washing rust cleaning, limestone coating, bonderizing, the most cold extrusion shaped
Obtain brake pipe joint blank；
Heat treatment: brake pipe joint blank is first to heat to 520-540 DEG C, is then heated to 780-860 DEG C, be again heated to 980-
1050 DEG C carry out Quenching Treatment with quenching oil, are incubated 1-3 hour, then 350-420 DEG C of temper, are incubated 1-2 hour,
Brake pipe joint semi-finished product；
Electrodeposited chromium layers: through pulse plating, brake pipe joint semi-finished product are prepared surface has the brake pipe joint of chrome plating, wherein
Pulse frequency is 3.2-3.5Hz, electric current density 60-68A/dm2, bath temperature is 50-55 DEG C.
The preparation method of brake pipe joint the most according to claim 1, it is characterised in that the composition of described 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.
The preparation method of brake pipe joint the most according to claim 2, it is characterised in that the composition of described brake pipe joint
And mass percent is: the component of described brake pipe joint and mass percent be: 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
For Fe.
The preparation method of brake pipe joint the most according to claim 1, it is characterised in that the temperature of described melting is
1300-1350℃。
The preparation method of brake pipe joint the most according to claim 1, it is characterised in that in rolling, start rolling temperature is 980-
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.
The preparation method of brake pipe joint the most according to claim 1, it is characterised in that in heat treatment first with 7-10 DEG C/
The ramp of min is to 520-540 DEG C, then with the ramp of 5-8 DEG C/min to 780-860 DEG C, then with 8-15 DEG C/min
Speed rise to 980-1050 DEG C.
The preparation method of brake pipe joint the most according to claim 1, it is characterised in that the one-tenth of electroplate liquid during pulse plating
Divide and ratio is Cr2O3: 180-220g/L, H2SO4: 1.5-2.0g/L, surplus is deionized water.
8. according to the preparation method of the arbitrary described brake pipe joint of claim 1-7, 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 °.
The preparation method of brake pipe joint the most according to claim 8, it is characterised in that pars intermedia is connected one end with afterbody
Opening straight through less than afterbody internal diameter, again smaller than head internal diameter.
10. according to the preparation method of the arbitrary described brake pipe joint of claim 1-7, it is characterised in that described brake pipe
The electroplating surface of joint has the zinc coat of 5-20 μm.
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