Service pipe of thin wall stainless steel already had manufacturing history of more than 40 years in the United States, Japan, Europe, there is manufacturing experience of more than 10 years only however in home, stainless steel service pipe walks into masses eye shot, be mixed to accept by people acknowledge with each passing day solid however thing of two years. Especially CCTV " 3.15 " the evening party explodes after all sorts of quality issues that give plastic conduit presence, the masses begins to pay close attention to drinking water to carry and the quality problem of facilities of pipeline of 2 water supply arises serious doubt.
More than 20 years of in the past, the government sector is popularized energetically " with model Dai Gang " , make path and equipment are able to apply the plastic water duct that PVC, PE, PPR is a delegate extensively, subsequently and the many quality problem that come and problem of 2 water pollution become people health with each passing day aquatic vivid the biggest secret worry. Path and equipment production use the plastic duct such as PVC, PE, PPR itself of material, recipe, craft exists quality hidden trouble, they are chemical synthesis material and remain has young member, very easy in fabricating process generation is harmful even carcinogen, in the meantime, mother of all sorts of auxiliary, fill can be added again in plastic treatment process makings, reclaim the chemical material such as makings, reworked material, together with is plastic conduit physics is mechanical function owes beautiful, conduit installation and service mass and life assure very hard. Accordingly, want to ensure the healthy water of people lives, path and equipment become duct of stainless steel water supply not 2 choices, in visible future, can say conduit of stainless steel water supply and equipment are the final product that drinking water carries kind of conduit.
One, brief introduction of service pipe of thin wall stainless steel
Thin wall stainless steel is in charge of is to pass special production facilities, the S304 of set dimension, S316 high grade stainless steel takes roller pressing to shape, through soldering, inside solder line is dissolve of entire smooth, online firm, bright Xiu Ping of flaw detection of anneal, backset, calm diameter, cut, port, air-tightness detects, polishing, pack wait to ten working procedure refine and be become.
The canal basically uses thin wall stainless steel at drinkable drinking water of clean water, life, cold water, hot water, seawater, fire control, light the fluid such as gas to carry with conduit. Among them, 2 times water supply and family decorate the public facilities such as village of water Wu company, school, hospital, residence wait for a respect to had gotten applied extensively. Housing and ministry of urban and rural construction were released on May 15, 2017 " regulations of technology of all of water system of straight water of building and village conduit " carry out formally. This regulations very set explicitly: "Tubal material should choose stainless steel canal, copper pipe to wait for the material of high grade canal that accords with provision level requirement " . 2018, " design of catchment of building water supply is normative " (GB50015) edit the tubal material that first choice already regarded stainless steel canal as in draft, the platoon is before plastic pipe. In recent years, each district government sector also publishs policy to popularize Bao Bi stainless steel to be in charge of in succession, city of partial provincial capital already start working construction, be in charge of underground of life drinking water the net to change to be in charge of for stainless steel stage by stage, the corresponding period, domestic residence decorates application of service pipe of thin wall stainless steel to also be pushed in the round.
2, function of machinery of physics of conduit of Bao Bi stainless steel and compare with plastic conduit function
1, physics of conduit of thin wall stainless steel is mechanical function (see a table one)
Express one, physics of conduit of Bao Bi stainless steel is mechanical function
2, stainless steel conduit and plastic pipe (PPR is in charge of) function is expressed quite (see a table 2)
Watch 2, stainless steel conduit and plastic pipe (PPR is in charge of) function compares a list
3, the environment is affected (see a table 3)
Watch 3, environmental influence is compared
4, economic cost (see a table 4)
Watch 4, economic cost is compared
3, service pipe of thin wall stainless steel manufactures technology
1, manufacturing technological process (see a picture one)
Graph one, service pipe of Bao Bi stainless steel manufactures technology
2, technological process of production leaving a line (see a picture 2)
Graph 2, service pipe of Bao Bi stainless steel manufactures technology from the line
3, technology of product line of stainless steel service pipe
Product line of service pipe of A, stainless steel is to use W to shape, use different roller pattern to produce the tubal material of different specifications. Product line is producible: The industry such as conduit of canal of titanium alloy canal, wholesome class fluid, heat exchanger canal, stainless steel provides material.
The B, product line that produces service pipe of high grade stainless steel should satisfy the following requirement: A, precision is tall: The axis is jumpy ≤ 0.03mm, ensure equipment runs stability. B, rate is rapid: Ensure welding line quality accords with ASME standard, when producing SUS304 16*0.6mm, speed can amount to 5-7m/min. C, percent of pass is tall: 98% above. Data of D, product line should be recorded and save, but date from of every steel tube solder electric current, power of solid dissolve equipment, electric current, frequency all can record in real time. E, have one key to open stop a function. F, perforation calls the police and function of automatic cut off the water supply.
4, stainless steel service pipe manufactures crucial technology
A, hang makings open a book to read (see a picture 3) . Coil steel place register makings chance (call uncoiler again) on, bearing spreads out steel to coil, double axis goes up shrink, coil metal strip internal diameter goes up close, by pneumatic the control that hold brake in the arms puts makings rate. Hank is online production, hank undertakes getting the materials ready, but serial production. Hang makings confidential to have bearing enoughly ability, lade by drive a vehicle, when steel of transhipment of through cargo coils, need to solder aircraft is fast to solder, ensure serial production. Here is forbidden zone of manufacturing process safety, blame operation personnel cannot be stood by.
B, shape (see a picture 4) . The stainless steel product of the different specification that adopts strip steel the horizontal roller that decorates alternately to frame and the roller in frame establishing roller undertake level is out of shape and obtain a need. Shape paragraph of main group part to guide, thick shape, essence of life shapes.
Shape Ping Gun. Shape through installing the roller of different aperture form to undertake to strip steel roller is pressed. Shape the bearing that makes the same score roller device to have the fluctuation level axis, axis that prop up, frame, sail upstream the composition such as the adjusting gear that make the same score an axis. Horizontal roller axis passes his on adjusting gear can make fluctuation adjust, differ with adjusting tubal base to be in the clearance between the thrust when be out of shape and fluctuation roller.
Shape establish roller. It is to participate in the transition between two levels roller to be out of shape above all, it is to avoid to be in charge of what after base leaves horizontal roller frame, form to rebound next, have oriented effect to enter frame of roller of a level. Device establishing roller by assemble slide block of axis establishing roller, adjust filar lever, adjust the composition such as nut and frame. Adjust filar lever and adjust swivel nut can adjust the span between coexistence roller and center.
C, solder (see a picture 5) . Through shopping roller squashs device general already was become shape close to be in charge of base roundly to undertake making a circle, the function of two pairs of compression roller is respectively: The first pair is squash beforehand, the 2nd pair squashs to solder, with preventing the tubal craze after soldering. The installation on compression roller is inside sealed protective box, form to close space, here the space is connected inert gase argon is enraged, make stainless steel canal enrages atmosphere to protect next soldering undertaking in argon, prevent welding line combustion, solder automatically by argon arc solder the system undertakes soldering to already shaping to seam the strip steel that close continuously.
D, inside whole smooth with welding line burnish (see a picture 6) . Provide stainless steel solder online planish welding line, make welding line and Mu Caiping glide are crossed, eliminate solder to run the good point that more outstanding solder runs defect, improve grade of welding line crystal. Cleared stainless steel is in charge of welding line burnish the part of capable person of mother of the prep above after soldering.
E, way is decided first. To soldering before solution treatment the stainless steel canal after undertakes booking diameter, in the meantime, after avoiding solution treatment, calm diameter quantity produces greater stress greatly too.
F, clean. Tubal material is in shape in the process, the surface can have stick have smeary, when entering solid dissolve facility so, high temperature combustion can form oil gas body, bring about quartz to be in charge of wall to turn ooze of black, black lead into very quickly oil, enrage the phenomenon that Louie blocks up. So the proposal configures filter cloth cleaning device tubal material before solid dissolve equipment, those who use hot water to clean face of appearance tubal material to go up is smeary, compress air to blow dry will improve.
Dissolve of G, shining solid (call shining anneal again) (see a picture 7) . What the canal uses thin wall stainless steel is 304 (06Cr19Ni10) material of austenite stainless steel, base canal solders after shaping, the surface inside classics rectifies smooth, welding line burnish, tunnel of shining solid dissolve is entered after cleaning (annealing furnace) undertake anneal (solution treatment) . Solid dissolve temperature is 1080 ℃ ± 10 ℃ , have proper thermal insulation, carbide ability gets dissolving adequately, solution treatment temperature crosses tall or too low metropolis to affect the quality of conduit directly, temperature is exorbitant, solder tubing is thick change, function drops, temperature is too low, solid dissolve is not complete, stress is eliminated not complete. Appear to prevent small leakage, the protection inside furnace enrages what should keep certain to be being pressed, if be hydric protection gas, above of general requirement 20kBar.
Graph 7, equipment of shining solid dissolve
Gas of the protection inside furnace has two kinds of methods, one kind is the anneal that falls with condition of completely hydric protection (recommend use) , this is hydric originate electroanalysis or tripartite is supplied, purity tall, dew point is low; Another kind is to use ammonia to decompose, the gas after decomposing is entered after the course is dry protection regards as gas inside furnace, opposite for purity and dew point should be differred a few, two kinds of methods are to use hydric regard protection as gas, the proposal uses completely hydric protection. Prevented the combustion that stainless steel is in charge of so, through the stainless steel after shining anneal the canal does not need again pickling, so the stainless steel of shining anneal manages the stress that eliminated the generation in producing a course, exterior brightness, corrosion resistance is better.
The stainless steel canal after heating enters cooling passageway, exchange through heat inside this passageway means and hydric undertake cooling, hydric conduct quantity of heat further to outer special mould lining, this lining has very tall thermal conductance, undertake cooling by exterior cooling water. With heat the share is same, all cooling jobs have below protection of pure hydric atmosphere. Cooling channel extreme, the temperature refrigeration that stainless steel is in charge of comes 100 ℃ are the following, steel tube is so OK surely in park air, and by a few water undertakes final gush drenchs cooling.
The H, correct that decide way is straight. Undertake deciding way to stainless steel according to the final demand of the product, make the product achieves tolerancepublic errand requirement. Essence of life decides diameter to use 4 roller correctional device, this device has around two pairs of roller, perpendicular rolling line can make one contrary roller fluctuation, left and right sides is adjusted, whole of line of one perpendicular to horizontal roller rolling is adjusted up and down, sail upstream among them the measurement standards that Ping Gun is in charge of according to stainless steel can be made adjust, the flatness that Jiao Zhigang is in charge of, in can guiding stainless steel canal to enter cut flatly to curium. 4 roller are correctional device should but perpendicular undertake adjustment at rolling center line.
Flaw detection of J, backset. Eddy current flaw detection is used at stainless steel to be in charge of exterior blemish to detect. Eddy current flaw detection can be used online detect, also can use detect from the line. Rate of shift of material of stainless steel canal is rapidder, eddy current flaw detection detects the effect is better.
Expect below K, cut. Use hydraulic pressure the length that perpendicular cut curiums the place of basis of finished product canal that will decide diameter hind needs is cut off, average length is 3 meters or 6 meters. the stainless steel after cutting off the canal sends store on skip, send airtight to detect.
L, airtight detects (see a picture 8) . Every canal material needs to undertake air impermeability test detects, detect pressure 6 kilograms, hold time 15 seconds. Detect equipment has semi-automatic and full automatic two kinds, full automatic air-tightness detects machine can come true to go up automatically makings, detect, next makings, detect 25 seconds control cycle, can detect at the same time every time 8-12 root stainless steel is in charge of.
M, polish (see a picture 9) . Through the stainless steel of shining solid dissolve tubal material needs mechanical polish, this can be in charge of material to maintain the appearance bright and clean bright beautiful, commonly used equipment provides material for stainless steel special polisher, should contain dust collector, facilitate those who collect polishing generation is drossy, prevent environmental pollution. The tubal material that Zuo removes also can use mechanical polish, it is good without pickling effect only.
N, pack. Eligible stainless steel provides material bag of every suit film, bundle up of suit of reoccupy textile bag, bundle up amount is decided by size tubal way. Can use artificial bundle up or be bundle up of automatic strapping machine. Automatic strapping machine can come true to go up automatically next makings, computation, bundle up, makings, but managing and many artificial, realize efficient production.
5, the sources of energy of product line of stainless steel service pipe is used up
A, compress air: Basically use at open a book to read implement brake timing, inside club of core of whole flat tension, clean steel tube. With baric force 0.4-0.7MPa. With tolerance 0.1m3/min.
B, argon is angry: Basically use at cutting the protection inside metal strip of pair of solder butt joint, butt welding, solder dissolve of protection, online solid discharges the air inside empty channel to use baric force 0.2MPa, use tolerance 10L/min on average, online solid dissolve is 30L/min with tolerance.
C, hydric: Online solid dissolve protects gas, with baric force 0.2MPa, use tolerance 10L/min on average.
D, with water: Basically use at welding torch to cool (0.5T/h of average water consumption) , inductor of online solid dissolve is cooling (3T/h of average water consumption) solid dissolve water covers steel tube to cool (10T/h of average water consumption) . With hydraulic force 0.4MPa, the temperature that drink water 30 ℃ , temperature giving water 35 ℃ , soft water of water quality requirement and clear water.
4, installation of conduit of thin wall stainless steel uses a technology (see a table 5)
Conduit of thin wall stainless steel regards indoor feed pipe as the first-rate in network system tubal material has been unquestionable, but because way of the join in having many is put on market at present, the key is the contrast of all sorts of pair of join means and choice. Current, basically be had 3 kinds by what the market approbates extensively: Block the join that press type, annulus to press type join, groove join, among them, application of join of card pressing type is the widest, the project project of 90% above uses calorie of connection that press type.
Watch 5, join of join of card pressing type, annulus pressing type, groove join, bear insert solder installation method is comparative
5, the market prospect of service pipe of thin wall stainless steel
On the safe side of service pipe of thin wall stainless steel, wholesome environmental protection, economy is applicable, the Bao Bi of conduit attenuates and construction of calorie of the join that press type that goes to the lavatory simply, strength of machine of quick and convenient, connection is good, pipe fitting tubal material manages through special type weld, corrosion resistance is strong, service life is long. In recent years, each district government sector also publishs policy to popularize Bao Bi stainless steel to be in charge of in succession, be in charge of underground of life drinking water the net to change to be in charge of for stainless steel stage by stage, the corresponding period, residence of family of stainless steel service pipe decorates Bao Bi to also be in of the government sector set an example below, begin comprehensive promotion.
Since 2015, shenzhen city carries out " the net transforms feed pipe of the community outside former special zone project " and " high grade drinking water joins a project " two service pipe nets transform a project in, used service pipe of thin wall stainless steel in the round, improvement of caustic of leakage of net of each area canal is clear after transforming, feed pipe of the community outside former special zone average leakage caustic leads the network by 21.53% fall to 5.18% , high grade drinking water joins a project average leakage caustic is led by 23.34% fall to 4.17% . Cartridge igniter maintains a number by annual aggregate 11 103 second fall to 1 256 second, high grade drinking water enters a project cartridge igniter to maintain a frequency to fall 673 times by add up to of the annual before transforming come 59 times.
Shenzhen is home takes the lead in realizing whole town land with certain boundaries high grade drinking water is entered door demonstrative city, also be first in dweller village feed pipe the net is transformed in the city that large-scale use stainless steel provides material, behoove gives Shenzhen municipal government greatly " assist " , shenzhen municipal government came true truly what people lives to healthy water is yearning with pursuit, each district government sector should draw lessons from the practice of Shenzhen municipal government actively, transform in self-invited conduit net and high grade drinking water is entered door in transforming a project, take the lead in hanging down model, the service pipe of thin wall stainless steel that popularizes use sanitation, healthy, service life to grow in the round, the drinking water that washs out harm people health is plastic conduit, ensuring people health is aquatic is various alive bear the blame governmental duty.
Service pipe of thin wall stainless steel is best drinking water duct, have the advantage that other canal material cannot replace, regard a kind of new-style and high-grade canal as material, the application that packs a respect with water supply and home in 2 water supply, building will replace plastic conduit in the round.
Bibliographical reference:
[1] the Shenzhen city feed pipe net such as Ding Xu is transformed reach high grade drinking water to enter a project to discuss China to give drain off water 2018, 34 (22)
[2] Xu Feng flies conduit of stainless steel of Shang Jie of clean of analysis of application of system of pipeline of Bao Bi stainless steel 2019, 3 (18)
