CN103806007A - Pretreatment method for preventing cold-bending cracking of austenitic stainless steel and improving corrosion resistance - Google Patents
Pretreatment method for preventing cold-bending cracking of austenitic stainless steel and improving corrosion resistance Download PDFInfo
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- CN103806007A CN103806007A CN201410059501.7A CN201410059501A CN103806007A CN 103806007 A CN103806007 A CN 103806007A CN 201410059501 A CN201410059501 A CN 201410059501A CN 103806007 A CN103806007 A CN 103806007A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 31
- 238000005260 corrosion Methods 0.000 title claims abstract description 31
- 238000005336 cracking Methods 0.000 title claims abstract description 16
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 9
- 238000005452 bending Methods 0.000 title abstract description 16
- 238000002203 pretreatment Methods 0.000 title abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 98
- 239000010935 stainless steel Substances 0.000 claims abstract description 98
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 238000004381 surface treatment Methods 0.000 claims abstract description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 35
- 230000002000 scavenging effect Effects 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000009413 insulation Methods 0.000 claims description 16
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 229910001120 nichrome Inorganic materials 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 abstract 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 238000009832 plasma treatment Methods 0.000 abstract 1
- 239000011734 sodium Substances 0.000 description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 238000002161 passivation Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000006056 electrooxidation reaction Methods 0.000 description 3
- 210000003127 knee Anatomy 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- LPEVOCIDQNXQDM-UHFFFAOYSA-L [Na].[Cr](=O)(O)O Chemical compound [Na].[Cr](=O)(O)O LPEVOCIDQNXQDM-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- 238000012356 Product development Methods 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 241000826860 Trapezium Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 229940117975 chromium trioxide Drugs 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- PXLIDIMHPNPGMH-UHFFFAOYSA-N sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 229940001516 sodium nitrate Drugs 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
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Abstract
The invention relates to a pretreatment method for preventing cold-bending cracking of austenitic stainless steel and improving corrosion resistance, and belongs to the field of cold-bending forming of stainless steel for rail transit equipment. According to the pretreatment method, a cold-bending zone of the stainless steel is subjected to heat preservation treatment at the temperature of 300-400 DEG C for 2-3 hours, surface cleaning and plasma treatment before cold-bending forming of the stainless steel so as to realize the beneficial effects of preventing cold-bending cracking and improving corrosion resistance. The cold-bending zone is subjected to heat preservation treatment so as to eliminate internal stress, improve the plasticity of a bending part of a corrosion resistant plate and prevent cracking caused by stress concentration in a cold-bending process of the corrosion resistant plate. Oxide skin and impurities on the surface of the stainless steel are removed through surface cleanness, and finally the corrosion resistance is improved by utilizing plasma surface treatment.
Description
Technical field
The present invention relates to a kind of pretreatment process that prevents austenitic stainless steel cold bend cracking and improve corrosion resisting property, belong to railway transportation equipment and use stainless steel cold roll forming field.
Background technology
Track traffic is a kind of large conveying quantity, low consumption, oligosaprobic green traffic ways.The common trend of Urban Rail Transit Development and high-speed railway Yi Shi world today railway development.In recent years, along with the active demand of railway transportation equipment to lightweight, high precision, complex section section bar, cold bending of stainless steel section has become the main raw that substitutes ordinary steel iron material manufacture railway transportation equipment.
Cold roll forming is the multi-pass molding roller by arranged in order, and metal plate and belt is constantly carried out to transverse bend, to make the Technology of specific section section bar.Cold roll forming is a kind of material-saving, energy-conservation, efficient sheet metal forming novel process, new technology.Utilize this technique, not only can produce high-quality shaped steel product, and can shorten product development cycle, enhance productivity.
What stainless steel car body adopted at present is all the high strength cold-rolled stainless steel plate of the special austenite of vehicle.Clod wash bar section of stainless steel is high to material surface specification of quality, because in the time that stainless steel surface exists the defects such as dirty, scuffing, pit, in Cold Roll Forming Process, these defects are exaggerated along with the machining deformation of blank.And the work hardening exponent of the existing stainless-steel cold-rolling strip for cold roll forming is high, there is surface cracking so often cause Cold Bending stress to be concentrated.
Stainless excellent corrosion-proof performance, but under the solution erosion action that contains chlorion etc., easily there is spot corrosion.After cold roll forming, stainless steel plate has formed the structure of large negative electrode-primary anode in geometric shape, and the anode dissolution speed of spot corrosion is accelerated; Meanwhile, owing to thering is automatic acceleration in Pitting Propagation, will cause very soon stainless corrosion failure to destroy.This safety for railway transportation equipment produces serious harm.Therefore the corrosion resisting property improving after stainless steel cold roll forming has very important significance.
Summary of the invention
The present invention relates to a kind of pretreatment process that prevents austenitic stainless steel cold bend cracking and improve corrosion resisting property, belong to stainless steel cold roll forming field.The present invention be before stainless steel cold roll forming, carry out successively with below 3 steps:
Step 1, to carry out 2-3h temperature for stainless steel plate clod wash region be the insulation processing of 300-400 ℃; Detailed process is as follows: according to stainless steel cold roll forming cross-sectional shape, determine stainless steel clod wash areal distribution position.In process furnace, according to clod wash areal distribution position, adjust the position of heating tube in process furnace, make heating tube be distributed in top, stainless steel plate clod wash region, guarantee that it is in effective heating area.Energising heating makes stainless steel clod wash region be warming up to 300-400 ℃, insulation 2-3h.
Step 2, stainless steel plate is successively sent in normal temperature scavenging solution 1 and high temperature scavenging solution 2 and soaked, then surface cleaning processing, by having the scavenging solution 3 of certain flow rate and temperature, has finally been washed in surface;
Wherein the moiety of scavenging solution 1 is NaOH 60-70g/L, Na
2siO
310-20g/L, Na
2cO
320-30g/L composition, soak time is 5-10 minute, temperature is 20-30 ℃;
Wherein scavenging solution 2 is 65%-70%NaOH by massfraction, 20%-25%NaNO
3, 2-7%Na
2sO
4, 3-8%Na
2cO
3composition, soak time is 15-25 minute, temperature is 350-450 ℃;
Wherein to be grouped into according to mass percent be 15%-25% HNO for 3 one-tenth of scavenging solutions
3, 2%-5%H
2o
2, 3%-6% citric acid, surplus is water, and the flow velocity of scavenging solution 3 is 10-20cm/s, and temperature is 40-50 ℃, and scavenging period is 1-5 minute.
Step 3, dry up behind stainless steel plate surface, carry out Surface Treatment with Plasma: two nichrome targets are placed in opposed both sides in vacuum chamber, and its composition is Ni 10%, Cr 90%(wt%), concrete target material structure is with reference to Granted publication number
?the utility model patent of CN202688420U.Stainless steel plate is placed between the nichrome target being oppositely arranged.Take body of heater as anode, stainless steel plate and nichrome target are negative electrode, are respectively establishing a controllable direct current power supply between anode and stainless steel plate and between anode and nichrome target.After vacuumizing, pass into argon gas and reach operating air pressure, switch on power and carry out Surface Treatment with Plasma.Detailed process is as follows:
(1) stainless steel plate is placed in vacuum chamber between two alloys target;
(2) being evacuated to air pressure is 1.5-2Pa;
(3) pass into argon gas, adjustment ar pressure is 20-35Pa;
(4) adjust target cathode voltage: 500-700V,
Adjust stainless steel plate cathode voltage: 300-450V;
(5) insulation 1-1.5h.
Advantage of the present invention: the present invention is by adjusting heating tube distributing position, carrying out 2-3h temperature for stainless steel plate clod wash region is the insulation processing of 300-400 ℃, eliminate the internal stress producing in stainless steel plate cold-rolled process, reduce the difficulty that in follow-up Cold Bending, work hardening brings, effectively prevent the generation of cold bend cracking.Scavenging solution 1 in surface cleaning of the present invention can be removed the greasy dirt on stainless steel plate surface, makes that the oxide skin on stainless steel plate surface is loose easily to come off simultaneously.Sodium hydroxide in scavenging solution 2 can make to be insoluble in sour chromium trioxide in oxide skin and become chromous acid sodium.Make chromous acid sodium be oxidized to rapidly water-soluble Sodium chromate by SODIUMNITRATE again.Sodium sulfate and sodium carbonate play activator, reduce soltion viscosity, reduce alkali lye adhesion amount, are convenient to follow-up cleaning.The scavenging solution 3 with certain flow rate can force dissolving scale removal to avoid the reduction of acid solution activity in cleaning process simultaneously, makes stainless steel surface acid solutions more even, and takes away the residue producing in cleaning by flow velocity.Efficiently remove the oxide skin of stainless steel surface by 3 kinds of scavenging solutions, make stainless steel plate surface-brightening smooth clean.The nickel chromium triangle coating that utilizes Surface Treatment with Plasma technology to generate, even compact is without defects such as holes, and surfacing quality is good.Coating and stainless steel are metallurgical binding simultaneously, in Cold Bending, with stainless steel base, same step plastic deformation occur, and occur without broken obscission.The corrosion resisting property of nickel chromium triangle coating excellence has improved the corrosion resistance of stainless steel in chloride ion-containing medium.Can effectively prevent austenitic stainless steel cold bend cracking and improve its corrosion resisting property through pre-treatment of the present invention.
Accompanying drawing explanation
The U-shaped schematic cross-section of Fig. 1 301L stainless steel cold roll forming;
Fig. 2 301L stainless steel cold roll forming ∏ type schematic cross-section;
Fig. 3 301L stainless steel cold roll forming rectangle and trapezium channel section schematic diagram.
Specific embodiment
Below in conjunction with embodiment, the present invention is described in further detail.For art technology people, completely can on the listed numerical value of embodiment basis, rationally summarize and derive.
Embodiment 1
1. 301L stainless steel plate cold roll forming cross-sectional shape as shown in Figure 1, calculates the horizontal throw of knee from stainless steel plate symmetry centre, according to the data obtained, settles heating tube distributing position.Stainless steel plate is sent into process furnace specified location, make heating tube be distributed in top, stainless steel plate clod wash region.Energising is heated to 300 ℃, insulation 2h.
2., after heating and thermal insulation finishes, it is NaOH 60g/L that stainless steel plate is sent into 20 ℃ of compositions of temperature, Na
2siO
310g/L, Na
2cO
3in 20g/L scavenging solution 1, soak 5 minutes.Then send into temperature and be the 65%NaOH of 350 ℃, 20%NaNO
3, 7%Na
2sO
4, 8%Na
2cO
3(wt%) in scavenging solution 2, soak 15 minutes.Then surface is by flow velocity 10cm/s, 25% HNO that temperature is 40 ℃
3, 2%H
2o
2, 3% citric acid cleaning liquid 3, scavenging period 1 minute.Final rinse water surface, takes away residual scavenging solution.
3., after cleaning finishes, dry stainless steel surface, then carries out Surface Treatment with Plasma.Select nichrome target, use nichrome target, composition is Ni 10%, Cr 90%(wt%).Detailed process is
(1) stainless steel plate is placed in vacuum chamber between two alloys target
(2) being evacuated to air pressure is 1.5Pa
(3) pass into argon gas, adjustment ar pressure is 20Pa
(4) adjust target cathode voltage: 500V
Adjust stainless steel plate cathode voltage: 300V
(5) insulation 1.5h
, in follow-up Cold Bending, there is not cracking phenomena in 301L stainless steel plate surfacing light after treatment.In 4%NaCl solution, carry out electrochemical corrosion performance test.Recording through the pretreated stainless steel self-passivation of the present invention current potential is-0.412 V, and corrosion current density is 0.0122 mAcm
-2, and be not-0.443V that corrosion current density is 0.0275 mAcm through the self-passivation current potential of pretreated stainless steel plate
-2.The corrosion potential of the pretreated stainless steel of known process in this medium improved 31mv with respect to untreated stainless steel.Calculate through pretreated 301L stainless steel corrosion resisting property and improved 2.25 times with respect to untreated 301L stainless steel.
Embodiment 2
1. 301L stainless steel plate cold roll forming cross-sectional shape as shown in Figure 2, calculates the horizontal throw of knee from stainless steel plate symmetry centre, according to the data obtained, settles heating tube distributing position.Stainless steel plate is sent into process furnace specified location, make heating tube be distributed in top, stainless steel plate clod wash region.Energising is heated to 400 ℃, insulation 2.5h.
2., after heating and thermal insulation finishes, it is NaOH 65g/L that stainless steel plate is sent into 25 ℃ of compositions of temperature, Na
2siO
315g/L, Na
2cO
3in 25g/L scavenging solution 1, soak 8 minutes.Then send into temperature and be the 70%NaOH of 400 ℃, 25%NaNO
3, 2%Na
2sO
4, 3%Na
2cO
3(wt%) in scavenging solution 2, soak 20 minutes.Then surface is by flow velocity 15cm/s, 20% HNO of temperature 45 C
3, 3%H
2o
2, 5% citric acid cleaning liquid 3, scavenging period 3 minutes.Final rinse water surface, takes away residual scavenging solution.
3., after cleaning finishes, dry stainless steel surface, then carries out Surface Treatment with Plasma.Select nichrome target, use nichrome target, composition is Ni 10%, Cr 90%(wt%).Detailed process is
(1) stainless steel plate is placed in vacuum chamber between two alloys target
(2) being evacuated to air pressure is 1.8Pa
(3) pass into argon gas, adjustment ar pressure is 25Pa
(4) adjust target cathode voltage: 650V
Adjust stainless steel plate cathode voltage: 400V
(5) insulation 1.2h
, in follow-up Cold Bending, there is not cracking phenomena in 301L stainless steel plate surfacing light after treatment.In 4%NaCl solution, carry out electrochemical corrosion performance test.Recording through the pretreated stainless steel self-passivation of the present invention current potential is-0.418 V, and corrosion current density is 0.0126 mAcm
-2, and be not-0.453V that corrosion current density is 0.0295 mAcm through the self-passivation current potential of pretreated stainless steel plate
-2.The corrosion potential of the pretreated stainless steel of known process in this medium improved 35mv with respect to untreated stainless steel.Calculate through pretreated 301L stainless steel corrosion resisting property and improved 2.34 times with respect to untreated 301L stainless steel.
Embodiment 3
1. 301L stainless steel plate cold roll forming cross-sectional shape as shown in Figure 3, calculates the horizontal throw of knee from stainless steel plate symmetry centre, according to the data obtained, settles heating tube distributing position.Stainless steel plate is sent into process furnace specified location, make heating tube be distributed in top, stainless steel plate clod wash region.Energising is heated to 350 ℃, insulation 3h.
2., after heating and thermal insulation finishes, it is NaOH 70g/L that stainless steel plate is sent into 30 ℃ of compositions of temperature, Na
2siO
320g/L, Na
2cO
3in 30g/L scavenging solution 1, soak 10 minutes.Then send into temperature and be the 67%NaOH of 450 ℃, 23%NaNO
3, 4%Na
2sO
4, 6%Na
2cO
3(wt%) in scavenging solution 2, soak 25 minutes.Then surface is by flow velocity 20cm/s, 15% HNO of temperature 50 C
3, 5%H
2o
2, 6% citric acid cleaning liquid 3, scavenging period 5 minutes.Final rinse water surface, takes away residual scavenging solution.
3., after cleaning finishes, dry stainless steel surface, then carries out Surface Treatment with Plasma.Select nichrome target, use nichrome target, composition is Ni 10%, Cr 90%(wt%).Detailed process is
(1) stainless steel plate is placed in vacuum chamber between two alloys target
(2) being evacuated to air pressure is 2Pa
(3) pass into argon gas, adjustment ar pressure is 35Pa
(4) adjust target cathode voltage: 700V
Adjust stainless steel plate cathode voltage: 450V
(5) insulation 1h
, in follow-up Cold Bending, there is not cracking phenomena in 301L stainless steel plate surfacing light after treatment.In 4%NaCl solution, carry out electrochemical corrosion performance test.Recording through the pretreated stainless steel self-passivation of the present invention current potential is-0.420 V, and corrosion current density is 0.0118 mAcm
-2, and be not-0.451V that corrosion current density is 0.0270 mAcm through the self-passivation current potential of pretreated stainless steel plate
-2.The corrosion potential of the pretreated stainless steel of known process in this medium improved 31mv with respect to untreated stainless steel.Calculate through pretreated 301L stainless steel corrosion resisting property and improved 2.29 times with respect to untreated 301L stainless steel.
Claims (3)
1. a pretreatment process that prevents austenitic stainless steel cold bend cracking and raising corrosion resisting property, is characterized in that stainless steel plate to carry out successively before cold roll forming following steps:
Step 1, to carry out 2-3h temperature for stainless steel plate clod wash region be the insulation processing of 300-400 ℃;
Step 2, stainless steel plate is successively sent in normal temperature scavenging solution 1 and high temperature scavenging solution 2 and soaked, then surface cleaning processing, by having the scavenging solution 3 of certain flow rate and temperature, has finally been washed in surface;
Wherein the moiety of scavenging solution 1 is NaOH 60-70g/L, Na
2siO
310-20g/L, Na
2cO
320-30g/L, soak time is 5-10 minute, temperature is 20-30 ℃;
Wherein scavenging solution 2 is 65%-70%NaOH by massfraction, 20%-25%NaNO
3, 2-7%Na
2sO
4, 3-8%Na
2cO
3composition, soak time is 15-25 minute, temperature is 350-450 ℃;
Wherein to be grouped into according to mass percent be 15%-25% HNO for 3 one-tenth of scavenging solutions
3, 2%-5%H
2o
2, 3%-6% citric acid, surplus is water, and the flow velocity of scavenging solution 3 is 10-20cm/s, and temperature is 40-50 ℃, and scavenging period is 1-5 minute;
Step 3, dry up behind stainless steel plate surface, carry out Surface Treatment with Plasma: two nichrome targets are placed in opposed both sides in vacuum chamber, stainless steel plate are placed between the nichrome target being oppositely arranged; Take body of heater as anode, stainless steel plate and nichrome target are negative electrode, are respectively establishing a controllable direct current power supply between anode and stainless steel plate and between anode and nichrome target; After vacuumizing, pass into argon gas and reach operating air pressure, switch on power and carry out Surface Treatment with Plasma.
2. the pretreatment process of prevention austenitic stainless steel cold bend cracking according to claim 1 and raising corrosion resisting property, is characterized in that described step 1 detailed process is as follows:
According to stainless steel cold roll forming cross-sectional shape, determine stainless steel clod wash areal distribution position; In process furnace, according to clod wash areal distribution position, adjust the position of heating tube in process furnace, make heating tube be distributed in top, stainless steel plate clod wash region, guarantee that it is in effective heating area; Energising heating makes stainless steel clod wash region be warming up to 300-400 ℃, insulation 2-3h.
3. the pretreatment process of prevention austenitic stainless steel cold bend cracking according to claim 1 and raising corrosion resisting property, is characterized in that described step 3 detailed process is as follows:
(1), stainless steel plate is placed in vacuum chamber between two alloys target;
(2), being evacuated to air pressure is 1.5-2Pa;
(3), pass into argon gas, adjustment ar pressure is 20-35Pa;
(4), adjust target cathode voltage: 500-700V,
Adjust stainless steel plate cathode voltage: 300-450V;
(5), insulation 1-1.5h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059501.7A CN103806007B (en) | 2014-02-21 | 2014-02-21 | The pretreatment process of prevention austenitic stainless steel cold bend cracking and raising corrosion resisting property |
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2014
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|---|---|---|---|---|
| EP0427853A1 (en) * | 1988-08-04 | 1991-05-22 | Osaka Sanso Kogyo Kabushiki-Kaisya | Metal oxidation apparatus and method |
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| CN102560396A (en) * | 2011-12-27 | 2012-07-11 | 东莞劲胜精密组件股份有限公司 | Surface corrosion-resistant low-resistance film and preparation method thereof |
| CN102719831A (en) * | 2012-05-29 | 2012-10-10 | 中冶南方工程技术有限公司 | Method for removing scales on surface of hot-rolled stainless steel strip |
| CN103014628A (en) * | 2012-12-31 | 2013-04-03 | 厦门建霖工业有限公司 | Full-dry wire drawing surface treatment method for metal base material |
| CN103526146A (en) * | 2013-10-15 | 2014-01-22 | 贵州钢绳股份有限公司 | Pre-plating surface treatment process for hot galvanized steel wire |
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