Formante & Veldado

Preciza malvarma rulita strio, fendo al nia specifita dikeco kaj larĝo, estas nutrita tra serio de konturitaj rulstandoj. Tiuj laŭstadie formas la strion en tubforman formon. La formita strio tiam estas nutrita tra la veldkesto, kie ununura torĉo kunfandas la randojn kune uzante Tungsten Inertan Gason (TIG) velda procezo. Fine control over welding parameters – torch settings, fluo de gaso, materiala rapido, ktp – enables us to weld a wide range of specialty alloys while ensuring high integrity of the weld zone. Post veldado, la kiel-velditaj tubkonkoj tiam estas tranĉitaj al specifaj longoj kaj pezoj laŭ la finaj tubpostuloj.

Pilgering

Sometimes used to process as-welded tubes, pilgering reduces the size of the tube across three dimensions – outside diameter (DE), internal diameter (ID) and wall thickness. We roll a die set with a tapered groove across the outside of the tube while supporting the inside diameter using a taper-matched, hardened steel mandrel. In a single cold working step, we can achieve a significant reduction in cross-sectional area while minimizing material loss and, most importantly, improving the material’s microstructure.

Tube Rolling

Like pilgering, tube rolling also uses compression to reduce the size of welded tubes. Tamen, while pilgering uses a pair of grooved, tapered dies to work the metal over a tapered mandrel, tube rolling utilizes one or two sets of rolls with constant cross-section grooves on the circumference of the tube. Generally, the process employs a cylindrical mandrel with little or no taper. The rolls are driven by rack and pinion gears of different radii along profiled cams, completing multiple 360º rotations around the tube.

Tube rolling is a very precise method of reducing very thin walled and/or smaller diameter tubes, and is often used as the final cold working step. By rolling, we’re able to achieve exceptional control over dimensional tolerances and surface finish while also minimizing material loss and improving the metal’s microstructure. Because it uses compression, tube rolling is well suited to processing unique metals like titanium and zirconium alloys.

Our tube rolling capabilities include both classic 3-roll (single roll set) tube rollers and an advanced 5-roll (2 roll sets) approach that Baosheng Tube developed and patented.

Cold Drawing

Typically used for the initial cold work following welding, cold drawing reduces the diameter by pulling the tube through a die that is smaller than the tube. In order to fit the tube into the die, one end is ‘swaged’ or ‘tagged’ thereby reducing the diameter of the leading end before drawing. Next, the narrowed end is passed through the die and clamped to a drawing trolley which pulls the tube through the die. After drawing the ‘tag’ is cropped from the tube end prior to cleaning.

Baosheng Tube employs three types of cold drawing techniques:

Sink Drawing

This is the simplest of the three drawing methods, as there is no tooling to support the ID surface. The tube is drawn through a die made of polished tool steel or industrial diamond, thereby reducing its inside and outside diameters. Our specialized lubrication and application techniques, combined with our proprietary die profiles, enable the OD surface to become smoother as the tube is drawn. Since the inside diameter is not constrained, the wall thickness of the tube will normally increase during drawing, and the ID surface finish will normally become rougher during a sink draw.

Rod Drawing

Rod drawing is our most commonly used cold draw method, primarily for intermediate or in-process drawing stages, where both the outside diameter and wall thickness are reduced at the same time. The tube is loaded over a hardened steel mandrel rod and both are then drawn through a die. This squeezes the tube onto the rod, reducing the outside diameter and thinning the wall simultaneously. The die and mandrel determine the size of the drawn tube, which is then slightly expanded by applying pressure to the outside of the tube so that the rod can be removed. Since larger reductions in cross-sectional area can be achieved by rod drawing, this method is used for mid-process stages to reduce tube sizes prior to the final drawing cycle.

Plug Drawing

This type of drawing is used to achieve the best possible surface finish and the greatest control over both dimensions and final temper. The outside diameter and wall thickness of the tube are both reduced during plug drawing, as the tube travels through a die and over a stationary plug/mandrel made of high grade tool steel. The plug or mandrel has a polished surface and is attached to a fixed back rod, which is carefully positioned within the drawing die. The tube is loaded over the mandrel/back rod. As the tube passes through the die, the burnishing action of the metal flowing over the stationary plug imparts a high tolerance surface finish inside the tube.

When properly lubricated and prepared, the ID will show very few flaws and finishes of 16 RMS or better can be achieved. Plug drawing is normally chosen for the final draw stage because it achieves a high quality surface finish, exceptional dimensional control, and positive influence on tensile strength requirements.

Shaping

Our weld-drawn tubes can be produced in almost any profile. For further details please contact our product teams.

Degreasing-cleaning

As part of our efforts to develop and implement more environmentally friendly processes, Superior Tube eliminated the use of TriChlorethylene (TCE) as a degreasing agent in 2008, replacing it with an equally effective but safer solvent called n-Propyl Bromide (nPB). Due to increasing concerns and the risks associated with the use of TCE, we invested significant effort in searching for a safer solvent that would not compromise the exceptional product quality upon which we have built our reputation.

While our switch to nPB has been very positive for our business, we recognize that our responsibility to protect the environment is an on-going effort, and we are continuing our development efforts to further improve the safety and reduce the environmental impact of our tube cleaning processes.

Kolekti

Kolektado estas uzata por moligi la metalon antaŭ pliaj malvarmaj laborado aŭ fabrikado, kaj plibonigas la totalan metalurgian mikrostrukturon de la tubo. Dum tubredukto aŭ malvarma tirado, ĝi povas fariĝi malmola kaj iom fragila. Por povi desegni la tubon denove, streĉoj formitaj dum malvarma laborado devas esti forigitaj por resendi la materialon al ĝia normala stato.

Dum recocido la tubo estas varmigita al kontrolita temperaturo (up to 2100°F) kaj trempi tempon. Per ĉi tiu procezo la tubo restas en formo, sed la grajnoj en la strukturo de la tubo reformiĝas en regulan neakcentitan ŝablonon. La rezulta recozita tubo estas pli mola kaj taŭga por redesegni.

Niaj proksime kontrolitaj procezoj de recocido kaj varmotraktado estas regule kontrolataj de nia nuklea, medicina, kaj aerospacaj klientoj.

Rektiĝo

Desegnado kaj kalciado ĝenerale rezultigas iom da kliniĝo, produktante iometan kurbiĝon en la tubo. At Superior Tube we use multiple roll mechanical straighteners in the first stage of finishing. La rektigilo aplikas premon kaj fleksas al la produkto por forigi kurbojn aŭ arkojn, resulting in a straightness level of 0.010” per foot, aŭ pli bone. Rektiĝo povas enkonduki etajn ŝanĝojn al la grandeco kaj mekanikaj trajtoj de la tubo, do ĉi tiuj aspektoj estas tre zorge kontrolitaj dum la procezo.

OD Polurado/Muelado

Kiam specifita de niaj klientoj, ni povas poluri aŭ mueli la eksteran diametron de iliaj tuboj uzante multoblajn kapzonajn muelmaŝinojn. Polurado estas farita por plibonigi la kosmetikan aspekton de la surfaco, provizante helan, uniforma surfaca finaĵo. Zonmuelado estas uzata por forigi malgrandan kvanton da metalo de la OD por forigi negravajn difektojn kaj neperfektaĵojn., which may result from cold working. Both polishing and grinding reduce the final outside diameter and wall dimensions, so precise controls are used to ensure a uniform size with an extremely high quality surface finish.

ID Grit blasting

Grit blasting is used to condition the ID surface, similar to the way grinding conditions the OD surface. An abrasive medium is forced through the tube using compressed air, resulting in a uniform surface finish free of minor cold working flaws. Grit blasting can alter both the ID size and wall thickness, so once again we use precise controls to ensure a uniform size. An extremely high quality finish is achieved. Non destructive testing and inspection

Baosheng Tube inspects all lots of tubing before shipment to ensure that every aspect of the customer’s order has been met. Our in-house inspection capabilities include:

• Alloy identity verification (Positive Material Identification, or PMI)
• Visual inspection
• Dimensional inspection using non-contact techniques such as laser micrometers and air gages whenever possible
• Surface roughness testing
• Immersion ultrasonic testing to exacting standards
• Encircling coil Eddy Current testing
• Dye penetrant examination
• Hydrostatic pressure testing
• Burst pressure testing
• Destructive mechanical and metallurgical testing:– Rendimento-Forto– Ultimate Tensile Strength– Plilongigo– Rockwell and Knoop Hardness testing– Metallographic analysis for grain size, structure, micro-cleanliness, and flaws– Manipulation testing such as bending, flattening, and flaring
• We also work with several qualified independent labs that can perform additional metallurgical testing not listed above, if required by our customers

All shipments include a full Test Certificate showing all required test results and verifying compliance with the order requirements.

Stamping/Labeling

All products will be identified in accordance with you requirements. Stamps usually include information such as our lot number, raw material heat number, dimensions, material and other pertinent information. For many products this information is marked in removable ink along the length of the tubing in the lot. For those products that are too small or too thin, the information can be included on material tags or box labels.

Packaging

Rektaj longoj de veldesegnitaj tuboj povas esti individue enmanigitaj en papero aŭ plasto kaj/aŭ pakitaj en niaj unikaj kartonaj disigiloj por certigi ke neniu damaĝo okazas dum trafiko.. Bobenitaj veldesegnitaj tuboj estas horizontale pakitaj uzante paperajn aŭ kartonajn apartigilojn por malhelpi tub-al-tuban kontakton.. Ĉiuj tuboj estas pakitaj en ambaŭ lignaj kestoj kovritaj per vaksa metia papero, tri-muraj argil-tegitaj plifortikigitaj kazoj, aŭ normaj kartonaj skatoloj. Plastaj finaj ĉapoj kiuj malhelpas fremdan materialon eniri en la tubojn ankaŭ haveblas laŭ peto.

Sendo

Kiam oni petas, ni povas aranĝi sendon kaj liveron al via doko, aŭ sendi viajn tubojn al tria partio kaj, se necesas, povas aranĝi rapidigitajn sendojn. Nuntempe ni eksportas al super 30 countries all over the world and use Incoterms® as our international framework for shipping.

Se vi bezonas pli da informoj,Bonvolu kontakti sales@grandsteeltube.com

1. Production of high precision stainless steel tubes since 2005

2. Laborante kun klientoj el Eŭropo,Okcidenta Azio,Nordameriko,South America since 2009,etc

3. Specimenoj povas esti liveritaj ene 10 tagojn post konfirmo

4. 50 tagoj kiel la produktadperiodo kaj livero post konfirmo de mendo.

5. 20,000 meters of high precision stainless steel tubes in stock.

6. 300 grandecoj povas esti ofertitaj de OD:6mmxWT:0.5mm al OD:131mmxWT:5mm

7. Tria inspektado kiel:TUV,BV,SGS,ktp akceptis

8. Profesia teamo helpas viajn specialajn tubpostulojn.

9. Aliaj rilataj tuboj povas esti ofertitaj :bright annealed stainless tubes,veldita neoksidebla ŝtalo tuboj;ktp

Se ajnaj demandoj,vi estas pli ol bonvena kontakti sales@grandsteeltube.com