Surface finish of precision stainless steel tube

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Surface finish of precision stainless steel tube

2020-06-24 H:40:17

304 stainless steel pipe is called SUS304 stainless steel pipe.

SUS304 stainless steel pipe belongs to grade stainless steel pipe, the domestic grade is equivalent to 0Cr19Ni9 stainless steel pipe, 0Cr18Ni9 is usually used to replace stainless steel pipe.

The anti rust mechanism of stainless steel is that alloy elements form a dense oxide film, which insulates oxygen contact prevents further oxidation. Therefore, stainless steel is "stainless steel".

Precision stainless steel pipe is also known as stainless steel precision pipe, also known as precision pipe.

According to the basic standard, the precision of precision stainless steel pipe can reach ± 0.05mm - ± 0.15mm. The tolerance range here is also briefly described. Generally, the tolerance range of small diameter thin-walled tube is basically within ± 0.05mm, that of large diameter precision stainless steel pipe is within ± 0.05mm - ± 0.15mm. The appearance is also very bright, basically can achieve the equivalent of 150-200 mesh. According to the national tolerance range, the basic wall thickness outer diameter of stainless steel pipe are within the range of plus minus 10% of the stainless steel seamless steel pipe factory. The appearance is smooth. Therefore, the naked eye can basically distinguish between ordinary precision stainless steel pipe ordinary industrial stainless steel pipe.

Effect of polishing stainless steel pipe surface: polishing is to use polishing wheel polishing belt to polish the surface of stainless steel pipe. The polishing wheel belt can remove surface burr, scale, rust, hole, scratch, weld, welding slag weld wave, so as to improve the surface smoothness.

Factors affecting polishing quality: there are many factors, such as polishing times, abrasive type particle size, polishing speed, polishing paste used on the polishing wheel, etc. The surface roughness after polishing can be as high as R ≥ 0.4 μ M.

Abrasives: there are mainly artificial emery (silicon carbide, silicon carbide, purple black flash particles), artificial corundum (alumina white to gray gray particles) emery red to black sand particles.

The choice influence of polishing particle size on stainless steel tube surface.

Selection of abrasive particle size: when grinding, it is usually reduced by several times. If the surface roughness of stainless steel pipe is small, it can also be polished once. On 304 stainless steel tube, it can affect the polishing agent.

Classification granularity / grid purpose.

Rough grinding has a large grinding capacity of 12-20, removes the thick non-uniformity.

Rough grinding 24 ~ 40, large grinding capacity, removing oxide scale, burr rough surface.

The grinding amount of 50-80 is moderate, the residual grinding trace after rough grinding is removed.

The grinding amount of intermediate grinding 100 to 150 is relatively small, which is prepared for fine grinding.

Fine grinding of 180-240 has a small amount of grinding can obtain relatively smooth surface.

The grinding amount of fine grinding 280-360 is very small, so it is ready for mirror polishing.

Polishing wheel: a polishing wheel made of cotton, rayon (non-woven) felt, wool cloth leather, sewn pressed. The finished product can be purchased. Drill holes before use. The coarse sand wheel is used to grind the circumference to prevent the wheel vibrating when rotating. Before use, the prepared glue should be heated (heated to 60-700 ℃ with a brush on the flange, then grinded), it can be used after drying (one day one day). Abrasives can be reused then reused.