The curvature radius of stainless steel elbow shall be controlled. For example, if the radius length is 1.5D, the radius of curvature must be within the required tolerance.

Since most of these pipe fittings are used for welding, in order to improve the welding quality, the ends are turned into grooves, with a certain angle and a certain edge. This requirement is also strict. There are provisions on the thickness of the edge, the angle and the deviation range, and there are many more geometric dimensions than the pipe fittings. The surface quality and mechanical properties of elbow are basically the same as those of pipe. For the convenience of welding, the material of steel shall be the same as that of the connected pipe.

1. Since most of the pipe fittings are used for welding, in order to improve the welding quality, the ends are turned into grooves, with a certain angle and a certain edge. This requirement is also strict. There are regulations on the thickness of the edge, the angle and the deviation range. The surface quality and mechanical properties are basically the same as those of pipes. For the convenience of welding, the steel grade of pipe fittings and connected pipes is the same.

1. That is, all pipe fittings shall be subject to surface treatment, and the iron oxide scale on the internal and external surfaces shall be sprayed off by shot peening, and then coated with anti-corrosion paint. This is for export needs. Moreover, in China, it is also to facilitate transportation and prevent corrosion and oxidation.

1. That is, the requirements for packaging. For small pipe fittings, such as export, wooden boxes need to be made, about 1 cubic meter. It is stipulated that the number of elbows in such boxes can not exceed 1 ton. The standard allows suits, that is, large sets and small sets, but the total weight can not exceed 1 ton. For large pieces y, a single package is required.