CN104889705A - Stainless steel tube production method for heat exchanger - Google Patents
Stainless steel tube production method for heat exchanger Download PDFInfo
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- CN104889705A CN104889705A CN201510256775.XA CN201510256775A CN104889705A CN 104889705 A CN104889705 A CN 104889705A CN 201510256775 A CN201510256775 A CN 201510256775A CN 104889705 A CN104889705 A CN 104889705A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
Abstract
The invention relates to stainless steel production process improvement, in particular to a stainless steel tube production method for a heat exchanger. The stainless steel tube production method sequentially includes the steps: round steel raw material preparation; peeling; perforation; billet tube preparation; polishing; checking; cold rolling; cold drawing; deoiling; annealing; acid pickling; finished product forming. The perforation temperature is 1100-1190 DEG C, and lubricating oil used for cold drawing is mixture including 35-45wt% of paraffin and 55-65wt% of oil. Annealing is realized by stages, temperatures are sequentially 700-800 DEG C at a first stage, 930-970 DEG C at a second stage, 1010-1050 DEG C at a third stage, 1030-1080 DEG C at a fourth stage and 1030-1080 DEG C at a fifth stage, and the fourth stage and the fifth stage are temperature keeping stages totally for 6-10 minutes. Mixed acid is used in acid pickling and comprises, by ratio, 5-8wt% of hydrofluoric acid and 10-15wt% of nitric acid, and the acid pickling temperature is 40-60 DEG C. A stainless steel tube produced by the method is applicable to the heat exchanger and high in yield.
Description
Technical field
The present invention relates to a kind of stainless steel production technology to improve, particularly relate to a kind of stainless steel tube production method for heat exchanger.
Background technology
The standard that existing product performs is more and more stricter.Product is qualified or defective checks out result to during final finished, causes the waste of production cost, and quality not guarantee property.Some situation can't be changed a social system, and when checking out defective work for scale pipe especially, can only again feed supplement produce.
Chinese patent CN1563772A (2005-1-12) discloses a kind of full parcel stainless steel pipe and manufacture method thereof, but is not suitable for preparing heat exchanger.
Summary of the invention
The object of this invention is to provide the stainless steel tube production method for heat exchanger that a kind of applicable lumber recovery is high.
Above-mentioned technical purpose of the present invention is achieved by the following technical programs:
For a stainless steel tube production method for heat exchanger, it is characterized in that it comprises step successively: raw material-peeling-perforation-hollow forging-polishing-inspection-cold rolling-cold-drawn-deoil-anneal round steel-pickling-finished product;
Described piercing temperature is 1100-1190 DEG C;
The lubricating oil adopted during described cold-drawn is the paraffin of 35-45wt% and the machine oil mixture of 55-65wt%;
Described annealing is carried out stage by stage, temperature be followed successively by 700-800 DEG C, 930-970 DEG C, 1010-1050 DEG C, 1030-1080 DEG C, 1030-1080 DEG C, insulation 6-10 minute;
Described pickling adopts nitration mixture pickling, and it is the hydrofluoric acid of 5-8wt% and the nitric acid of 10-15wt% that nitration mixture comprises proportioning, and pickling temperature is 40-60 DEG C.
The present invention, from control with raw material, by material and the technology controlling and process of special content proportioning, makes the stainless steel tube made be suitable in heat exchanger.The external diameter 6-30mm outer diameter tolerance that primary standard specifies requires that, for (-0.2mm)-(+0.15) mm, the outer diameter tolerance that existing predetermined outside diameter is less than or equal to 25mm is-0.1-(+0.1) mm, and dimensional requirement is strict.Adopt the lumber recovery of present invention process to bring up to more than 88% from original lumber recovery 85%, cost reduces.
As preferably, be 06Cr19Ni10 or the 00Cr17Ni14Mo2 stainless steel tube finished product of (19.01-19.08) * (1.61-1.69) mm for specification: hollow forging is (66-68) * (4.2-4.8);
First time is cold-rolled to (37-39) * (2.31-2.38) mm, and cold deformation coefficient is 3.31-3.38;
Second time is cold-rolled to (19.01-19.08) * (1.61-1.69) mm, and cold deformation coefficient is 2.88-2.95.
By specific production technology, while making finished product obtain required specific standard, the standard that field of heat exchangers needs can be reached, and improve lumber recovery.
As preferably, be 06Cr19Ni10 or the 00Cr17Ni14Mo2 stainless steel tube finished product of 19.05*1.65mm for specification: hollow forging is 67*4.5mm;
First time is cold-rolled to 38*2.35mm, and cold deformation coefficient is 3.35;
Second time is cold-rolled to 19.05*1.65mm, and cold deformation coefficient is 2.92.
As preferably, for 06Cr19Ni10 material, described piercing temperature 1150-1190 DEG C; Described annealing is carried out stage by stage, and temperature is followed successively by 780 DEG C, 950 DEG C, 1020 DEG C, 1050 DEG C, 1050 DEG C; Be incubated 8 minutes.
As preferably, for 00Cr17Ni14Mo2 material, described piercing temperature 1100-1150 DEG C; Described annealing is carried out stage by stage, and temperature is followed successively by 700-720 DEG C, 930-970 DEG C, 1010-1050 DEG C, 1045-1065 DEG C, 1045-1065 DEG C; Insulation 6-10 minute.
As preferably, for 00Cr17Ni14Mo2 material, described piercing temperature 1100-1150 DEG C; Described annealing is carried out stage by stage, and temperature is followed successively by 700 DEG C, 950 DEG C, 1030 DEG C, 1050 DEG C, 1050 DEG C; Be incubated 8 minutes; The lubricating oil adopted during described cold-drawn is the paraffin of 40wt% and the machine oil mixture of 60wt%.
As preferably, as preferably, the peeling thickness in described peeling step is 1.2-1.5mm; Described polishing comprises rough polishing and essence is thrown, and polishing is counted as 2.1-2.3%; During product inspection, eddy current inspection through-hole diameter adopts 0.8mmB level standard specimen to detect.
Some stainless steel tube production technologies, blank factory is production control cost, reduces the quality on round steel surface, occurs more dispatch, crackle.The present invention passes through when peeling according to different quality surface determination peeling quantity, and controlled by annealing process in the production phase, simultaneously by the control of waste tube outer surface quality of finish, the polishing of outer surface is adjusted, in the middle of controlling, the quality of product outer surface, compared with product in the past, plays gradual control stainless steel tube quality by source, eliminate surperficial hair check, stainless steel pipe surface quality is high.The inspection of end product quality, adds tight nondestructive inspection by outer surface, and detect the external defects of finished product, the eddy current inspection grade of sample pipe is adjusted to B level from A level, and stainless steel pipe surface quality is high.
As preferably, described method is welded after being also included in product inspection, and described welding comprises welding torch Current Control, the leveling of interior welding bead, the polishing of outer welding bead and heat treatment; Described welding torch Current Control comprises the argon arc welding of employing two welding torch, and during welding, the electric current of two welding torches is identical, controls at 100-150A; Described outer welding bead polishing adopts automatically grinding device, and polishing pressure is controlled by the pick-up current size of flap wheel and steel tube surface; Described heat treatment is in an inert atmosphere, cools rapidly after 1010-1050 DEG C of heat treatment.
In existing stainless steel tube, welding bead processing method easily causes the scratch of inside pipe wall, and reduce product percent of pass, adopt welding method of the present invention, the stability that can improve the quality of products, surface quality is good.
As preferably, the outer ring of supporting the directive wheel of welded stainless steel pipe in described welding is brass.
Brass and tube fraction power little, directive wheel can be avoided the scratch of soldering stainless steel outer surface, improve further the surface quality of heat exchanger stainless steel tube.
In sum, the present invention has following beneficial effect:
1, be suitable for heat exchanger, product percent of pass is high;
2, eliminate steel tube surface hair check, surface quality is good.
Detailed description of the invention
Embodiment one
Stainless steel tube production method for heat exchanger comprises step: raw material-peeling-perforation-hollow forging-polishing-inspection-cold rolling-cold-drawn-deoil-anneal round steel-pickling-finished product;
TP304L (06Cr19Ni10) stainless steel tube finished product for specification is 19.01*1.61mm:
Piercing temperature is 1150 DEG C; Hollow forging is 66*4.2;
The lubricating oil adopted during cold-drawn is the paraffin of 35wt% and the machine oil mixture of 65wt%;
First time is cold-rolled to 37*2.31mm, and cold deformation coefficient is 3.31;
Second time is cold-rolled to 19.01*1.61mm, and cold deformation coefficient is 2.88.
Annealing is carried out stage by stage, and temperature is followed successively by 720 DEG C, 930 DEG C, 1010 DEG C, 1045 DEG C, 1045 DEG C, is incubated 6 minutes;
Pickling adopts nitration mixture pickling, and it is the hydrofluoric acid of 8wt% and the nitric acid of 10wt% that nitration mixture comprises proportioning, and pickling temperature is 50 DEG C.
The stainless steel tube finally made is suitable in heat exchanger; Lumber recovery brings up to 88%, and cost reduces.
Embodiment two
Stainless steel tube production method for heat exchanger comprises step: raw material-peeling-perforation-hollow forging-polishing-inspection-cold rolling-cold-drawn-deoil-anneal round steel-pickling-finished product;
TP304L (06Cr19Ni10) stainless steel tube finished product for specification is 19.08*1.69mm:
Piercing temperature is 1190 DEG C; Hollow forging is 68*4.8;
The lubricating oil adopted during cold-drawn is the paraffin of 45wt% and the machine oil mixture of 55wt%;
First time is cold-rolled to 39*2.38mm, and cold deformation coefficient is 3.38;
Second time is cold-rolled to 19.08*1.69mm, and cold deformation coefficient is 2.95.
Annealing is carried out stage by stage, and temperature is followed successively by 750 DEG C, 970 DEG C, 1050 DEG C, 1065 DEG C, 1065 DEG C, is incubated 10 minutes;
Pickling adopts nitration mixture pickling, and it is the hydrofluoric acid of 6wt% and the nitric acid of 15wt% that nitration mixture comprises proportioning, and pickling temperature is 50 DEG C.
The stainless steel tube finally made is suitable in heat exchanger; Lumber recovery brings up to 88.5%, and cost reduces.
Embodiment three
TP304L (06Cr19Ni10) stainless steel tube finished product for specification is 19.05*1.65mm:
Piercing temperature 1160 DEG C; Hollow forging is 67*4.5mm;
The lubricating oil adopted during cold-drawn is the paraffin of 40wt% and the machine oil mixture of 60wt%;
First time is cold-rolled to 38*2.35mm, and cold deformation coefficient is 3.35;
Second time is cold-rolled to 19.05*1.65mm, and cold deformation coefficient is 2.92.
Annealing is carried out stage by stage, and temperature is followed successively by 780 DEG C, 950 DEG C, 1020 DEG C, 1050 DEG C, 1050 DEG C; Be incubated 8 minutes.
Pickling adopts nitration mixture pickling, and it is the hydrofluoric acid of 5-8wt% and the nitric acid of 10-15wt% that nitration mixture comprises proportioning, and pickling temperature is 40-60 DEG C.
The stainless steel tube finally made is suitable in heat exchanger; Lumber recovery brings up to 88.8%, and cost reduces.
Embodiment four
With embodiment one, unlike being the TP316L(00Cr17Ni14Mo2 of 19.01*1.61mm for specification) stainless steel tube finished product:
Piercing temperature 1100 DEG C;
Annealing is carried out stage by stage, and temperature is followed successively by 680 DEG C, 930 DEG C, 1010 DEG C, 1045 DEG C, 1045 DEG C; Be incubated 6 minutes.
The stainless steel tube finally made is suitable in heat exchanger; Lumber recovery brings up to 88.1%, and cost reduces.
Embodiment five
With embodiment two, unlike being the TP316L(00Cr17Ni14Mo2 of 19.08*1.69mm for specification) stainless steel tube finished product:
Piercing temperature 1150 DEG C;
Annealing is carried out stage by stage, and temperature is followed successively by 720 DEG C, 970 DEG C, 1050 DEG C, 1065 DEG C, 1065 DEG C; Be incubated 10 minutes.
The stainless steel tube finally made is suitable in heat exchanger; Lumber recovery brings up to 88.4%, and cost reduces.
Embodiment six
With embodiment three, the TP316L(00Cr17Ni14Mo2 unlike for 19.05*1.65mm) stainless steel tube finished product, piercing temperature 1130 DEG C; Annealing is carried out stage by stage, and temperature is followed successively by 700 DEG C, 950 DEG C, 1030 DEG C, 1050 DEG C, 1050 DEG C.
The stainless steel tube finally made is suitable in heat exchanger; Lumber recovery brings up to 88.9%, and cost reduces.
Embodiment seven
With embodiment four, be 1.2mm unlike the peeling thickness in peeling step.
Polishing comprises rough polishing and essence is thrown, and it is 2.1% that polishing is counted.
During product inspection, eddy current inspection through-hole diameter adopts 0.8mmB level standard specimen to detect.
Weld after product inspection, welding comprises welding torch Current Control, the leveling of interior welding bead, the polishing of outer welding bead and heat treatment; Welding torch Current Control comprises the argon arc welding of employing two welding torch, and during welding, the electric current of two welding torches is identical, controls at 100A; Outer welding bead polishing adopts automatically grinding device, and polishing pressure is controlled by the pick-up current size of flap wheel and steel tube surface; Heat treatment is in an inert atmosphere, cools rapidly after 1010 DEG C of heat treatment; The outer ring of supporting the directive wheel of welded stainless steel pipe in welding is brass.
The stainless steel tube finally made is suitable in heat exchanger; Lumber recovery brings up to 88.1%, and cost reduces.Eddy current inspection detects, qualification rate 90%.
Embodiment eight
With embodiment five, be 1.5mm unlike the peeling thickness in peeling step.
Polishing comprises rough polishing and essence is thrown, and it is 2.3% that polishing is counted.
During product inspection, eddy current inspection through-hole diameter adopts 0.8mmB level standard specimen to detect.
Weld after product inspection, welding comprises welding torch Current Control, the leveling of interior welding bead, the polishing of outer welding bead and heat treatment; Welding torch Current Control comprises the argon arc welding of employing two welding torch, and during welding, the electric current of two welding torches is identical, controls at 150A; Outer welding bead polishing adopts automatically grinding device, and polishing pressure is controlled by the pick-up current size of flap wheel and steel tube surface; Heat treatment is in an inert atmosphere, cools rapidly after 1050 DEG C of heat treatment; The outer ring of supporting the directive wheel of welded stainless steel pipe in welding is brass.Eddy current inspection detects, qualification rate 91%.
Embodiment nine
With embodiment six, be 1.3mm unlike the peeling thickness in peeling step.
Polishing comprises rough polishing and essence is thrown, and it is 2.2% that polishing is counted.
During product inspection, eddy current inspection through-hole diameter adopts 0.8mmB level standard specimen to detect.
Weld after product inspection, welding comprises welding torch Current Control, the leveling of interior welding bead, the polishing of outer welding bead and heat treatment; Welding torch Current Control comprises the argon arc welding of employing two welding torch, and during welding, the electric current of two welding torches is identical, controls at 130A; Outer welding bead polishing adopts automatically grinding device, and polishing pressure is controlled by the pick-up current size of flap wheel and steel tube surface; Heat treatment is in an inert atmosphere, cools rapidly after 1030 DEG C of heat treatment; The outer ring of supporting the directive wheel of welded stainless steel pipe in welding is brass.Eddy current inspection detects, qualification rate 92%.
This specific embodiment is only explanation of the invention; it is not limitation of the present invention; those skilled in the art can make to the present embodiment the amendment not having creative contribution as required after reading this description, as long as but be all subject to the protection of Patent Law in right of the present invention.
Claims (9)
1. for a stainless steel tube production method for heat exchanger, it is characterized in that it comprises step successively: raw material-peeling-perforation-hollow forging-polishing-inspection-cold rolling-cold-drawn-deoil-anneal round steel-pickling-finished product;
Described piercing temperature is 1100-1190 DEG C;
The lubricating oil adopted during described cold-drawn is the paraffin of 35-45wt% and the machine oil mixture of 55-65wt%;
Described annealing is carried out stage by stage, temperature be followed successively by first stage 700-800 DEG C, second stage 930-970 DEG C, phase III 1010-1050 DEG C, fourth stage 1030-1080 DEG C, five-stage 1030-1080 DEG C, described fourth stage and five-stage are that holding stage amounts to insulation 6-10 minute;
Described pickling adopts nitration mixture pickling, and it is the hydrofluoric acid of 5-8wt% and the nitric acid of 10-15wt% that nitration mixture comprises proportioning, and pickling temperature is 40-60 DEG C.
2. a kind of stainless steel tube production method for heat exchanger according to claim 1, is characterized in that: 06Cr19Ni10 or the 00Cr17Ni14Mo2 stainless steel tube finished product for specification being (19.01-19.08) * (1.61-1.69) mm: hollow forging is (66-68) * (4.2-4.8);
First time is cold-rolled to (37-39) * (2.31-2.38) mm, and cold deformation coefficient is 3.31-3.38;
Second time is cold-rolled to (19.01-19.08) * (1.61-1.69) mm, and cold deformation coefficient is 2.88-2.95.
3. a kind of stainless steel tube production method for heat exchanger according to claim 2, is characterized in that: 06Cr19Ni10 or the 00Cr17Ni14Mo2 stainless steel tube finished product for specification being 19.05*1.65mm: hollow forging is 67*4.5mm;
First time is cold-rolled to 38*2.35mm, and cold deformation coefficient is 3.35;
Second time is cold-rolled to 19.05*1.65mm, and cold deformation coefficient is 2.92.
4. a kind of stainless steel tube production method for heat exchanger according to claim 2, is characterized in that: for 06Cr19Ni10 material, described piercing temperature 1150-1190 DEG C; Described annealing is carried out stage by stage, and temperature is followed successively by 780 DEG C, 950 DEG C, 1020 DEG C, 1050 DEG C, 1050 DEG C; Be incubated 8 minutes.
5. a kind of stainless steel tube production method for heat exchanger according to claim 2, is characterized in that: for 00Cr17Ni14Mo2 material, described piercing temperature 1100-1150 DEG C; Described annealing is carried out stage by stage, and temperature is followed successively by 680-720 DEG C, 930-970 DEG C, 1010-1050 DEG C, 1045-1065 DEG C, 1045-1065 DEG C; Insulation 6-10 minute.
6. a kind of stainless steel tube production method for heat exchanger according to claim 5, is characterized in that: for 00Cr17Ni14Mo2 material, described piercing temperature 1100-1150 DEG C; Described annealing is carried out stage by stage, and temperature is followed successively by 700 DEG C, 950 DEG C, 1030 DEG C, 1050 DEG C, 1050 DEG C; Be incubated 8 minutes; The lubricating oil adopted during described cold-drawn is the paraffin of 40wt% and the machine oil mixture of 60wt%.
7. a kind of stainless steel tube production method for heat exchanger according to any one of claim 1-6, is characterized in that: the peeling thickness in described peeling step is 1.2-1.5mm; Described polishing comprises rough polishing and essence is thrown, and polishing is counted as 2.1-2.3%; During product inspection, eddy current inspection through-hole diameter adopts 0.8mmB level standard specimen to detect.
8. a kind of stainless steel tube production method for heat exchanger according to claim 7, it is characterized in that: described method is welded after being also included in product inspection, described welding comprises welding torch Current Control, the leveling of interior welding bead, the polishing of outer welding bead and heat treatment; Described welding torch Current Control comprises the argon arc welding of employing two welding torch, and during welding, the electric current of two welding torches is identical, controls at 100-150A; Described outer welding bead polishing adopts automatically grinding device, and polishing pressure is controlled by the pick-up current size of flap wheel and steel tube surface; Described heat treatment is in an inert atmosphere, cools rapidly after 1010-1050 DEG C of heat treatment.
9. a kind of stainless steel tube production method for heat exchanger according to claim 8, is characterized in that: the outer ring of supporting the directive wheel of welded stainless steel pipe in described welding is brass.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10234542B2 (en) | 2015-09-30 | 2019-03-19 | Texas Instruments Incorporated | Measurement of transceiver performance parameters in a radar system |
| CN113106464A (en) * | 2021-03-30 | 2021-07-13 | 天津太钢天管不锈钢有限公司 | Pickling process of stainless steel annealing and pickling line |
| CN116042985A (en) * | 2022-11-21 | 2023-05-02 | 湖州华特不锈钢管制造有限公司 | Production process of stainless steel seamless steel tube for vacuum heat-insulating liquid hydrogen pressure container |
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