Changsha South Tantalum Niobium CO LTD

Leading Chinese supplier of tantalum,niobium and their alloy materials as sheet, tube, wire, ingot, foil, rod, target for various applications like energy, aerospace, electronics, machinery and chemical.
Changsha South Tantalum Niobium CO LTD(CSTN), a national high-tech enterprise, focuses its business on R&D and manufacture of tantalum,niobium,and tantalum and tungsten alloy materials and products since 2000.
Located at the Changsha development zone for high and new technological industry, we occupy an are of more than 30000 square meters. We are equipped with a comprehensive set of state-of-the-art producing machines and testing instruments. As a result, our annual production capacity reach over 200 tons.Niobium sheet .
We now have nearly 200 staff in total, among them 30% scientific research personnel of college degree or above.
With years of R&D, we have already achieved 13 national patents and other copyright patents, with independent intellectual property rights. From 2005, we have won ISO9001,ISO14000,ISO18000 certificates and many other National, provincial and municipal honorary certificates. Niobium tube .
We own ourself import and export right. 85% of our products are sold to abroad, mainly in United States and Europe. In past over ten years, CSTN has provided its customers with the solutions to their materials technology problems in the main industry fields of chemical products, solar energy and semiconductor materials, powder metallurgy products, welding materials, diamond tools and medical materials. We win a great reputation of good quality and excellent service among our customers.

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Professional Power Bank Manufacturer – Hello Tech

Professional Power Bank Manufacturer – Hello Tech Energy established in 2011, its former is a worldwide technically leading manufacturer which had started committ to R&D, production and sales of portable powers in 2010.Hello Tech has got a total of 5 invention and practical new patents and 20 appearance patents. It is the first company who approved to set up an enterprise standard for power bank in China.v
Based on the contradictions of global consumers’ mobile devices’ multi-functional intergration but power shortage. Hello Tech established it’s technology research and product test labs. At the same time, it has been cooperating with worldwide researching organizations on study the technical difficulties.
Starting from the design concepts of humanity and excellence, Hello Tech set up a sound smart portable power product series, compatible for portable terminals.
Meanwhile, with the forward-looking strategic view and strong sense of social responsibilities, Hello Tech propose and push low-carbon life, established a research & application team on solar and wireless technology and developed a variety of solar battery products.
Thanks to hard work of the professional marketing team, the innovative R&D team, the diligent production team, Hello Tech factory got qualified by ISO9001, ISO14001 ,BV Certifications and all the products are certified with CCC, CE, FCC, Rohs, UN38.3 and UL. Hello Tech products were honored Our products are very popular in North America,EU, China and other Asia countries. We have been serving first class brand owners like Griffin, HTC, Batteriesplus, China Unicom, Lenmar.
Hello-Tech In the spirit of “diligent, innovative, grateful and mutual win”, making use of advanced management concepts and well-established QC system, we are on the way to being the worldwide technology leader in portable powers, and are sparing no efforts to create values for customers.

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Stainless Steel Fabrication – Grades of Steel

Stainless Steel Fabrication – Grades of Steel

Stainless steel fabrication is done for making a range of products like automobile parts, medical equipment and instruments, frames, furniture items, grills, railings, brackets, panels, sinks, utensils, bathroom and kitchen accessories, lab equipment, many other products and welding of pipelines for industrial and other applications.
The stainless steel used for fabrication has different grades. All grades of Stainless Steel (SS) possess different mechanical properties that allow only a few selected grades easier to fabricate. Most commonly used grades are 316 L and 304 L.

(Image:8011 aluminum foil)
The austenitic stainless steel grades have the ability to be fabricated using all the standard fabrication processes. The common austenitic SS has high ductility and can be bent, folded, cold and hot forged, spun, deep drawn and roll formed. Austenitic SS work hardens very rapidly; as such the operations require more force and heavier machines. Grades 301, 302 and 304 can be cold drawn. But, higher tensile properties are mostly limited to thin sheets and fine wire sizes. With the increase in the size, the material gets work-hardened. In some forming operations, it may be necessary to soften the parts by annealing for further processing.

Free-machining Grade 303 is preferred for making machined parts . 430F and 416 are other free-machining grades.

The stainless steel raw material for fabrication is available in different shapes and sizes including sheets, plates, flats, wires, rods, rounds and solid profiled sections and hollow round , rectangular and square tubes.
Fabrication of different products includes the production of their parts employing different processes such as cutting, bending, shearing, welding, grinding, polishing and assembling. The cutting can be done with a chisel and hammer or shears manually or with metal saws, power hacksaw, shears, press brakes, and using gas cutting, gas welding cutters, oxy-fuel, plasma torches and laser cutting equipment etc.

The stainless steel wires, rods sheets and pipes are formed into different shapes in cold condition with bending and forming jigs on different machines. Both manual labor and machines are used for fabrication work. Rolling machines are used to form round shapes from the plates. You may need to straighten the warped metal also.

A number of parts are manufactured using power presses for use in fabrication. Power presses are mostly used for making parts from sheets and plates by cutting, piercing, blanking, bending, forming and drawing operations .

A few round shaped parts may be manufactured on lathe machines by the turning and further machining operations. Drilling is a very common operation in fabrication work. Finally, the parts produced by various operations are assembled together by fabricators to make sub-assemblies and final products. In fabrication most of the assembly work involves welding. Different types of welding done for stainless steel fabrication are Gas Tungsten Arc, Plasma Arc, Shielded Metal Arc, Gas Metal Arc, Flux Cored Arc (MIG), Submerged Arc, and Electric Resistance Welding.
A few parts are also joined by brazing and soldering as a well. The parts are assembled using binding, fasteners and rivets besides welding process.

The weldabilities of the different grades of stainless steel considerably varies. Nearly all grades can be welded. The austenitic grades can be easily welded. Special welding electrodes are used for welding of SS. Mostly, the common welding methods can be employed. A complete range of different welding consumables is easily available for use with standard equipment.

It is recommended to make use of special-alloyed austenitic welding electrodes to weld together different grades of SS, or with other materials.

It is also possible to solder all grades of SS with a lead-tin soft solder. However, leaded solder is not to be used in food processing or serving products. Soldered joints are weaker and can be used only where low mechanical strength is needed. Where welding cannot be done, brazing can give stronger joint using silver.

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The conventional steps to cut stainless pipe straight and burr-free

The conventional steps to cut stainless pipe straight and burr-free

To achieve a burr-free and straight cut, conventionally, the following steps have been taken to cut stainless pipe

(Image:321 stainless steel plate)
1. Cut the tubing 2. De-burr the pipe using a bench grinder stone wheel 3. Clean the edges of the tube with wire wheel on bench grinder 4. Using a sander, sand the tube so its flat 5. Clean again using a wire wheel 6. Then TIG it connecting to the other pipe

Sometimes some of those steps need to be done twice or more just to make sure its flat and burr free. It is very time consuming to do this.

Two recommended methods to cut stainless tube

Stainless pipe can be fabricated by methods similar to those used for carbon steels and other common metals. However, changes may be necessary to the extent that they differ in yield strength and rate of work hardening.

Method One, Saw Guide combined with Portable Band Saw The portable Band Saw cutter must be sturdy, have sufficient power. The Saw Guide helps eliminate the vibration when cutting stainless pipe. Constant feeds are most important to prevent the tool from riding on the stainless pipe.

Method Two , Orbital Pipe Saw

For cutting and beveling stainless pipes, orbital pipe saw is another good choice. The saw blades rotate at high speed, are small, inexpensive and available in different versions for different materials and wall thicknesses.

The cutting is executed by manually rotating the machine housing 360 degree around the pipe and then, with a circular toothed blade driven by 1600 watt motor, the pipe is cut with one single rotation. The cutting action takes seconds, and cut-off is straight and clean

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