1.4404 Sanitary Stainless Tubes

Description

Forming & Welding

A precision cold rolled strip, slit to our specified thickness and width, is fed through a series of contoured roll stands. These progressively form the strip into tubular shape. The formed strip is then fed through the weld box, where a single torch fuses the edges together using a Tungsten Inert Gas (TIG) welding process. Fine control over welding parameters – torch settings, gas flow, material speed, etc – enables us to weld a wide range of specialty alloys while ensuring high integrity of the weld zone. After welding, the as-welded tube shells are then cut to specific lengths and weights according to the final tube requirements.

Annealing

Annealing is used to soften the metal before further cold working or fabrication processes, and improves the overall metallurgical microstructure of the tube. During tube reduction or cold drawing, it can become hard and somewhat brittle. To be able to draw the tube again, stresses formed during cold working need to be removed to return the material to its normal state.

During annealing the tube is heated to a controlled temperature (up to 1200 ℃) and soak time. Through this process the tube remains in shape, but the grains in the structure of the tube reform into a regular unstressed pattern. The resulting annealed tube is softer and suitable for redrawing.

Our closely controlled annealing and heat treat processes are audited regularly by our nuclear, medical, and aerospace customers.

Straightening

Drawing and annealing generally results in some degree of bowing, producing a slight bend in the tubing. At Baosheng Tube we use multiple roll mechanical straighteners in the first stage of finishing. The straightener applies pressure and flex to the product in order to remove bends or bows, resulting in a straightness level of 1.00mm per meter, or better. Straightening can introduce slight changes to the size and mechanical properties of the tubing, so these aspects are very carefully controlled during the process.

OD Polishing/Grinding

When specified by our customers, we can polish or grind the outside diameter of their tubes using multiple head belt grinding machines. Polishing is done to improve the cosmetic appearance of the surface, providing a bright, uniform surface finish. Belt grinding is used to remove a small amount of metal from the OD in order to eliminate minor flaws and imperfections, 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:– Yield Strength– Ultimate Tensile Strength– Elongation– 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

Straight lengths of weldrawn tubing can be individually sleeved in paper or plastic and/or packaged in our unique cardboard spacers to ensure no damage occurs during transit. Coiled weldrawn tubes are horizontally packed using paper or cardboard separators to prevent tube-to-tube contact. All tubing is packed in either wooden crates lined with wax craft paper, tri-wall clay-coated reinforced cases, or standard cardboard boxes. Plastic end caps that prevent foreign material from getting inside the tubes are also available upon request.

Shipment

When requested, we can arrange for shipment and delivery to your dock, or ship your tubes to a third party and, if needed, can arrange for expedited shipments. We currently export to over 30 countries all over the world and use Incoterms® as our international framework for shipping.

If you need more information,please contact sales@tubesolutions.com.cn

Polished Stainless Steel Tubing is the main tubing line for a piping system, the surface is polished to meet the requirement of high purity hygienic requirment from food, beverage, beer, winery, pharmacy, cosmetics etc.. Generally, food grade stainless steel tubings are made in stainless steel 304 and 316L, but we provide other grade too such as hastelloy C22, 316Ti, Titanium and nickel alloy etc.

We offer both  seamless stainless steel tubes and welded food grade stainless steel pipe to ASTM A270, and size is up to 12″. Inner and outer surface is polished to meet the high purity requirement of hygienic industries. Baosheng sanitary has ability to supplying qualified sanitary tubings comply to your your condition and FDA,GMP requirement.

 Material:

Stainless Steel 304, 316L or En.1.4301, 1.4404 etc. Specified grade is available.

    Strength:

•     Material of stainless steel 316L and 1.4404 is from reputed mill to guarantee the chemical composition and mechanical properties of sanitary tubings. Material certificate will be submitted to orders.
•     Heat Treatment of solution annealing for the sanitary tubings and fittings are available. The heat treated will be relief stress which caused by cold forming of fabrication, to improve the corrosion performance.
•     High precision on dimension and wall thickness.
•     Bright annealing is available.
•     Fast delivery for general specification to meet your needs well in time.
•     Both seamless and welded sanitary tubings are available to meet your different usage.
•     Multiple grade upon your requirement.
•     Length is up to 12 meters.
•     Min. order quantity of sanitary tubings is from 300Kgs.
•     Offer industrial pipe and tubes according to order.
•     Surface roughness condition < Ra 32.

    Quality & Inspection:

•      PMI test to verify material grade.
•      Dimension controlling.
•      Visual and surface 100% examination before shipment.
•      End protected for shipment.
•      Packed in wooden case (Free-fumigated).

    Polishing Opinion:

Mechanically is available to meet your high quality requirement on the surface of sanitary tubings. Outer and Inner surface can be treated complied to specified needs, and to meet FDA, GMP requirement.

•    Inner and Outer Polished : Ra 20 (0.5?m), Ra 25 (0.6?m) , Ra 32 (0.8?m)  or  Grit 180, 200, 320 etc.
•    Inner polished and external pickled
•    Inner pickled and external polished
•    Both Internal and external pickled
•    Internal and external bright annealing solutions

    Application:

    Food, Brewery, Beverage, Dairy, Pharmaceutical, Biopharma etc.