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What are the characteristics of inferior threaded stainless steel pipe fittings?

Time : 2022-09-27 Visited :  116 次

Wenzhou Longwan Junkai Valve Factory is located in Longwan, the valve capital of China. Is a professional manufacturer of stainless steel valves. The main products are: stainless steel ball valve, stainless steel Y-strainer, stainless steel flange, stainless steel mirror, stainless steel gate valve, stainless steel globe valve, stainless steel check valve, etc.
The company has complete equipment, advanced technology and quality, scientific management, complete testing means, and has established a perfect quality assurance system. Equipped with advanced testing equipment such as physical and chemical analysis, mechanical properties, water, air pressure, flaw detection, etc., each process from raw materials to finished products is inspected by special personnel, forming a complete inspection process.
There are many types of threaded stainless steel pipe fittings on the market today. Some people may not know how to distinguish the quality of threaded stainless steel pipe, so next, Junkai Valve will briefly introduce the characteristics of inferior threaded stainless steel pipe fittings for everyone to distinguish.
1. Scar formation
The surface of inferior stainless steel pipe will be prone to scarring. There are two main reasons: 1. The material is uneven and there are many impurities. ② The manufacturer’s sanitation equipment is simple and easy to stick to steel. After these impurities bite into the roll, it is easy to cause scarring.
2. Generate folds
Inferior stainless steel tubes are prone to folds. Folding is the formation of various fold lines on the surface of the stainless steel tube. The reason for the formation of folds is that some manufacturers pursue high efficiency too much, and the pressing amount is too large, resulting in the formation of ears in the tube, which will form folds during the next rolling, and the folded products will crack after bending, resulting in stainless steel tubes. The intensity dropped significantly.
3. Formation of cracks
Cracks are easily formed on the surface of inferior stainless steel pipes. Because its material is adobe, adobe has many pores. During the cooling process, cracks are formed due to thermal stress, and cracks occur after rolling.
4. No metallic luster on the surface
The surface of the inferior stainless steel pipe has no metallic luster and will show a light red or a color similar to pig iron. There are two reasons: ① Its material is adobe. ②The rolling temperature of fake and inferior pipes is not standard. The steel temperature is measured visually, so it is not surprising that the performance cannot meet the standard if the rolling is not carried out according to the specified austenite region.
5. Easy to scratch
Inferior stainless steel pipes are easy to be scratched, because the manufacturer’s production equipment is simple, and it is easy to form burrs, scratch the surface of the steel pipe, and deep scratches can even weaken the strength of the stainless steel pipe.
6. Thin and low transverse tendons
Inferior stainless steel pipes have thin and low transverse ribs, which often cause dissatisfaction. This is because in order to achieve a large negative tolerance, the reduction amount of the first few passes of the finished product is too large, the iron shape is too small, and the hole shape is not full.
7. The cross section is oval
The cross-section of the inferior stainless steel pipe is oval, because the reduction amount of the first two passes of the finished roll is too large in order to save materials.
The above are the characteristics of inferior threaded stainless steel pipes, and everyone should pay attention to their identification.
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