How to buy stainless steel pipe

First, before selecting the stainless steel tube need to take into account the use of stainless steel tubes and the use of the environment.

Second, in the selection of steel pipe must determine the material up to standard. To 304 material as an example.

1. can be acid reagent test, 30 seconds after the material 304 does not change color, 201 becomes black.

2. carefully look at the surface of the tube whether to play the steel material "304" words, and to obtain the manufacturer's quality certificate as proof.

3. analysis from the price, if 304 stainless steel pipe even lower than the market price of 301 material should be carefully identified, there may be other materials impersonation; 4.

4. bulk purchase can take samples sent to the national authoritative testing center for composition laboratory testing.

Third, watch the outer surface and the tube wall color is bright and smooth, whether the thickness is uniform or rough phenomenon.

General welded pipe this basic do not need to check, and seamless steel pipe is produced by cold-drawn or hot-rolled, improper operation in the production process is prone to uneven thickness, cracking and other phenomena on the tube surface, and rough surface is generally seamless tube is not polished, if no special requirements for the appearance does not affect the use.

Fourth, when buying and selling should choose the excellent products assessed by the Quality and Technical Supervision Bureau.

Fifth, when buying and selling must try to choose the rolled tube in the internal heavy skin, pockmarks, and rolling green lines and other situations less, especially to check whether the internal surface is smooth and flat.

The above-mentioned are some tips for buying stainless steel tubes, choose high-quality stainless steel tubes not only have the advantages of safety and reliability, health and environmental protection, but also have the