Stainless steel pipe fittings is the collective name of various stainless steel pipeline connection workpiece, can be divided into different categories according to the shape, use, connection methods. As a consumer, it is more intuitive to see the surface brightness of the stainless steel tube.

Stainless steel decoration tube forming before the material for 2B surface stainless steel coil strip, forming after the appearance of stainless steel welded pipe for the glossy surface, the industry is also commonly known as hairy surface, this appearance lubrication has a bright, is the original color of the metal.

On the basis of the bright surface stainless steel welded pipe through the polishing equipment processing (180 ~ 600 # polishing wheel) polishing grinding treatment can be obtained abrasive surface (round sand / straight wire), also known as matte surface, bright surface and high brightness and mirror surface appearance role.

Several elements that can affect the brightness of stainless steel pipe fittings:

1, raw material appearance defects. Such as scratches, pockmarks, scratches, sand eyes, over pickling, etc.

2, through the deep drawing of the product. The appearance of the area with a large amount of deformation will also be out of small black spots, which then affects the BQ sex.

3, raw material raw material problem. Hardness is too low, polishing is not easy to polish bright, and hardness is too low, the appearance of the deep drawing easy to appear orange peel phenomenon, and then affect the BQ sex. High hardness of BQ sex is relatively good.

4, the oil content of the emulsion is too high. The oil in the emulsion through the high temperature into carbon if not removed in time, it will accumulate in the 304 stainless steel pipe parts appearance, after rolling will form indentation.

Usually the mirror role of stainless steel pipe is only to the high brightness of the representation, as long as the stainless steel plate grinding and polishing to achieve a true mirror.

Stainless steel joint appearance treatment industry sector is generally divided into brushed and bright surface 2, is also currently suitable for the vast majority of customers' product needs. Some customers choose mirror stainless steel tube to make more beautiful products, but the relative cost will also increase.

Factors affecting the surface quality of stainless steel pipe fittings

1. Pressing and molten die surface quality. Melting die surface roughness is an important part of the casting surface roughness, which is related to the quality of the surface of the die, the die pressing method and pressing process parameters.

2. Stainless steel surface quality. Stainless steel is a columnar crystalline structure network as a skeleton, refractory materials, additives and water, etc. filled in the middle, so that after drying and roasting the surface there are pores of varying sizes. Metal liquid penetration into the surface pores of stainless steel is the main reason for the surface roughness of the pieces. Metal liquid penetration depth: with the crystal diameter, the average diameter of surface pores sound, alloy liquid surface radius of curvature, etc..

Therefore, in order to obtain a surface finish stainless steel castings need to reduce the crystal and filler particle diameter, reduce the diameter of the surface pores庐; or the use of additives that can be enriched in the surface, the larger pores will be filled to reduce the depth of metal penetration.

3. Casting process impact. The temperature of stainless steel, metal liquid pouring temperature and pressure head, pouring vacuum and other process parameters have an impact on the surface roughness of the casting, especially the temperature and pouring temperature influence.

Stainless steel temperature and metal liquid pouring temperature and casting surface roughness relationship. With the temperature and metal liquid pouring temperature increases, the metal liquid filling performance improvement, penetration into the surface pore depth increases, the surface roughness of stainless steel castings is increased.

4. The impact of the alloy. Thermal conductivity is small, after the use of stainless steel, metal liquid pouring into the type of slow cooling, the resulting castings coarse grains, intergrain grooves will make the casting surface roughness, the depth of such grain boundary grooves will even reach 7μm. For this reason, the alloy should be densified, and the use of better thermal conductivity of zircon and other fillers to improve the cooling rate of stainless steel castings, so that the casting surface layer grains are finer to reduce the surface roughness of the casting .