Stainless steel 

To put it simply, stainless steel is not easy to rust steel, in fact, a part of stainless steel, both rust, and acid (corrosion resistance).Stainless steel's rust and corrosion resistance are due to the composition of a chrome-rich oxide film (passivation film) on its surface.This rust resistance is relative to corrosion resistance.The experimental results show that the corrosion resistance of steel in the atmosphere, water and other weak medium and nitric acid oxidation medium, with the addition of chromium water content in steel and progress, when the chromium content reached a certain percentage, steel corrosion resistance attack sudden change, that is, from easy to rust to rust, not corrosion resistance to corrosion.There are many ways to classify stainless steel.According to the arrangement structure classification at room temperature, there are martensite, austensite, ferrite and duplex stainless steel;According to the primary chemical composition classification, basically can be divided into chromium stainless steel and chromium nickel stainless steel two systems;According to the use of stainless steel nitric acid resistance, resistance to sulfuric acid stainless steel, seawater resistance stainless steel, etc., according to the type of corrosion resistance can be divided into pitting stainless steel, stress corrosion resistance stainless steel, intercrystalline corrosion resistance stainless steel;According to function characteristic classification can be divided into non-magnetic stainless steel, free cutting stainless steel, low temperature stainless steel, high strength stainless steel and so on.Because stainless steel has outstanding corrosion resistance, formability, compatibility and in a very wide range of temperature in the strong patience and other series of characteristics, so in heavy industry, light industry, daily necessities occupation and building decoration and other occupations to obtain a wide range of applications.Austenitic stainless steel having an austenitic arrangement at room temperature.Steel with Cr about 18%, Ni 8%~10% and C about 0.1% has stable austenite arrangement.Austenitic chrome-nickel stainless steel contains the famous 18cr-8ni steel and on this basis, the addition of Cr, Ni content and participate in Mo, Cu, Si, Nb, Ti and other elements developed by the high cr-ni series of steel.Austenitic stainless steel is non-magnetic and has high resistance and plasticity, but the strength is low, it can not be strengthened through phase change, can only be strengthened through cold processing.Such as S, Ca, Se, Te and other elements, it has excellent cutting.This kind of steel in addition to oxidation resistance acid medium corrosion, if the element such as Mo, Cu also ability sulfuric acid, phosphoric acid and, acetic acid, urea corrosion.If the carbon content of this kind of steel is less than 0.03% or contains Ti and Ni, its intercrystalline corrosion resistance can be significantly improved.High silicon austenitic stainless steel has excellent corrosion resistance.Because of its comprehensive and outstanding induction function, austenitic stainless steel has been widely used in all walks of life. 

Welding performance of 321 stainless steel welded pipe:

321 stainless steel welding tube factory high temperature alloy

Mainly used for machinery, cars, bicycles, furniture, hotel and hotel decoration and other mechanical parts and structural parts.It represents material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.GB/ t12771-2008 (welded stainless steel tube for fluid transport).Mainly used for conveying low pressure corrosive medium.

Jiangsu richest steel products co., LTD. Is a production enterprise of stainless steel decorative pipe, stainless steel square pipe, stainless steel round pipe, stainless steel seamless pipe, stainless steel industrial welded pipe and so on.The main products of the company are stainless steel decorative pipe, stainless steel square pipe, stainless steel round pipe, stainless steel seamless pipe, stainless steel industrial welded pipe, etc.The products produced by the company are tested by strict inspection system, and the products are produced in strict accordance with the requirements of customers.

Stainless steel welded pipe is mainly used for heat exchanger pipe, fluid pipe, pressure pipe, mechanical structure pipe, urban landscape, and other industries, the annual consumption of about 700,000 t.Industrial stainless steel welded pipe demand is relatively high, and the production process is mature, China's annual use of industrial stainless steel welded pipe quantity is about 150,000 t, some still need to import.

Raw material uncoiling -- leveling -- end cutting and welding -- lofting -- forming -- welding -- removal of inner and outer bead -- precorrection -- induction heat treatment -- sizing and straightening -- eddy current inspection -- cutting off -- water pressure inspection -- pickling -- final inspection (strict control) -- packaging -- shipment.The products are widely used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction.

Welded steel pipe also known as welded pipe, is made of steel plate or strip steel after the process of crimping steel pipe, generally fixed feet 6 meters.Welding steel tube production process is simple, production efficiency is high, variety specification is more, equipment investment is less, but general strength is lower than seamless steel tube.Since the 1930s, with the rapid development of high quality strip continuous rolling production and the progress of welding and inspection technology, the weld quality has been continuously improved, and the variety and specification of welded steel tubes have been increasing day by day, and they have replaced seamless steel tubes in more and more fields.

Large diameter steel pipe, high transmission efficiency, and can save the investment of laying pipelines.Mainly used to transport oil, natural gas pipelines.4. Spiral seam high-frequency welded steel pipe (sy5038-83) used for pressure fluid transportation is made of hot rolled steel strip coil as tube blank and often formed by warm spiral. The spiral seam high-frequency welded steel pipe used for pressure fluid transportation is welded by high-frequency lap welding method.

These stainless steel pipe grades are sold to a wide range of industries/markets, due to their overall corrosion resistance and good machinability:

* Chemical and petrochemical
* Power generation
* Renewable energy
* Pulp and Paper
* Process piping
* Pharmaceutical
* Food and beverage
* Oil and gas
* Mining
* Water/waste
* Marine