Seamless steel tubes are widely used. the final purpose seamless steel pipe is rolled by ordinary carbon steel, low alloy steel or alloy steel, and therefore the output is way, mainly used for conveying fluid pipes or structural parts.
Available in three categories in step with use:
A. Supply in keeping with chemical composition and mechanical properties;
B. Supply in line with mechanical properties;
C. Supplied in keeping with hydrostatic test: if the steel pipes supplied in line with class A and B are accustomed withstand liquid pressure, they shall even be subjected to hydrostatic test.
The seamless tube of special use has boiler with seamless tube, chemical power with, geology with seamless steel tube and oil with seamless tube and then on. Seamless steel pipe with hollow section, an outsized number of used for conveying fluid pipeline, like conveying oil, fossil fuel, gas, water and a few solid material pipeline. Compared with solid steel like round steel, steel tube has the identical bending and torsional strength and lighter weight, so it’s a sort of economic section steel.
It is widely utilized in the manufacture of structural parts and mechanical parts, like oil drill pipe, automobile drive shaft, bicycle frame and steel scaffolding employed in construction and other circular parts manufactured from steel pipe, which may improve the use rate of materials, simplify the manufacturing process, save materials and interval, and has been widely employed in the manufacture of steel pipe. the subsequent may be a brief introduction to the three characteristics of seamless steel pipe.
1, corrosion resistance
Most chrome steel products require good corrosion resistance. Seamless steel pipes are like class I and II tableware, kitchen appliances, water heaters, water dispensers, etc. Some foreign merchants also test the merchandise for corrosion resistance: use NACL solution to look at boiling, after a period of your time the answer is to empty, wash and dry, determine weight loss to work out the degree of corrosion.
2. Welding machinability
Welding performance requirements vary from product to product. A tableware usually doesn’t require welding properties, even for a few pot enterprises. However, most products require raw materials with good welding performance, like class II tableware, thermos cups, steel pipes, water heaters, drinking machines then on.
3, polishing
At present, stainless-steel products are generally polished within the production process, only some products like water heaters, water dispensers lining don’t must be polished. Therefore, this needs good polishing properties of the staple. the most factors affecting the polishing performance are as follows:
1. Surface defects of raw materials. like scratches, pitting, soaking, etc.
2. The material of seamless steel pipe. The hardness is simply too low, it’s dangerous to shine when polishing (BQ isn’t good), the hardness is just too low, the surface is at risk of skin phenomenon when deep drawing, affecting the BQ performance. BQ with high hardness is comparatively better.
3. After deep drawing, small black dots and RI high imitation bridging also will appear on the surface of the realm with large deformation, which is able to affect the BQ attribute.
Post time: Dec-15-2021