Client always call us and wanna buy High quality pipe fittings. How to know the quality from the appearance of pipe fittings. It is not easy but we will know while using. Safety first is in the project quality. When it occurs, will be caused irreparable damage.

We think the difference between good and secondary pipe fittings is whether they are qualified.

Seamless Pipe

Raw material

In order to produce good pipe fittings, we must choose qualified raw materials.Like the steel pipe, steel plate and billet which are used to manufacture Pipe Elbow, Pipe Reducer, Pipe Tee, Nipple, Coupling, Cap, Outlet, Union and other pipe fittings must be tested to meet the requirements of the national standards. In fact, poor manufacturers is to reduce costs, they use unknown pipe or other raw materials, some procurement of engineering surplus material, some procurement of steel processing defective pipe and test machine products, some procurement has reached the use of End-of-life scrap gas transmission pipe, some use low-grade steel to replace the high grade.For example, using GB/T 8162 seamless steel tubes instead of GB/T 8163 seamless steel tubes, and even use welded steel pipe to replace seamless steel pipe. These will be brought endless hidden dangers in the future.

 Mold

While producing the pipe fittings, like Pipe Elbow, Tee, Reducer, Cap, Cross, Union, Outlet and Coupling. We need to use the mold to press,squeeze and forge. So the manufacturers have requirements of inspecting the mold regularly. To reducer pull, scratches and other defects in molding process.

Stainless Steel Elbow

Heat Treatment

The main function of heat treatment is to eliminate the stress, reduce the hardness, refine the grains and improve the microstructure and properties. For stainless steel refers to the austenite. In particular, cold formed pipe fittings, must be 100% heat treatment. But now there are some small factories still use small coal stove to do heat treatment, it all depends on the worker experience, the furnace temperature unsteady unevenness, cannot guarantee the heat treatment effect.

REDUCER

 Nondestructive testing is NDT

National and international standards both have corresponding provisions of NDT on Stainless Steel Elbow, Reducer, Tee, Cap, Cross and other Pipe Fittings.For example: cold extrusion tee must be 100% magnetic particle inspection, the weld fittings must be 100% radiographic inspection. However, some factories do not have the ability of inspection or too self-confident, omitted the essential nondestructive testing,and not discover the product which existed the surface or the internal significant flaw.

ASTMA403 WP316L Cap

End Preparation

Most pipe fittings will be weld with piping or pairs fittings  in the engineering site. This requires roundness, thickness and groove of Elbow End, Tee End, Reducer End and Cap End must be excellent, otherwise it will bring difficulty to weld in the engineering site, and then affect the engineering welding quality. Some people think: our pipe wall thickness is more than the customer requirements, should not be a problem. As you can imagine, too thick end thickness will also cause the scene can not be welded

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