国产国拍亚洲精品福利_亚洲av永久无码天堂网毛片_思思热99re在线视频_91亚洲老熟女网_成人手机免费在线观看_国产精品色婷婷五月_国产精品人成在线观看1一_亚洲AV乱码一区二区三区臂_丰满少妇被猛烈进入高清播放!_国产精品jizz在线观看下载

The specific production capacity of a business can be seen from the condition of a business man's factory, just like some people can be seen from a few things. I think this is the so-called "smell and know people".

Now the products in the steel market are mixed, and the market in the steel market has not been very good in recent years. The production capacity is excessive. The merchants may already have a lot of hoarding goods. It is easy to make seamless steel pipes, stainless steel and other products for a long time. Corrosion may occur and the quality of the product is reduced. Many merchants put them in the steel we bought and mixed them. So how do we judge whether these steels are really good?

First of all, it is necessary to recognize that stainless steel is not necessarily stainless, and it will rust because of some external factors after a long time. Therefore, the quality of steel cannot be judged by this. Bad steel will have a lot of deficiencies *, prone to folds, and uneven surfaces.

Inferior steel materials are not good, there are many impurities, the production environment of the manufacturers is simple, and scarring and cracking are easy to occur. We all know that the surface of a general steel pipe is smooth and has a silver-white metallic luster, while inferior steel is different. Not only does it have no metallic luster, but its performance is much worse than that of good steel.

Also pay attention to the incision of the steel. The incision of the superior steel is smooth and tidy, while the inferior steel will have gaps. The uneven composition of the steel makes it easy to make the radius of the steel pipe uneven.

And if you go to the manufacturer to buy, we can look at the size of the manufacturer, whether the work equipment in the workshop has the conditions to produce superior * steel, and the manufacturer ’s packaging can also see whether it is a fake steel product Because of the small seamless steel tube manufacturer, the packaging is very loose and irregular.