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Stainless Steel Pipe Fittings With A Good Shape, Pressure And Strong Ability
Jul 20, 2017

Stainless steel pipe fittings, especially the tee, elbow and the size of the first in the pipeline construction process more and more common, mainly because of its good shape, pressure and strong, simple welding and other characteristics to ensure that the pipeline Pressure capacity, so in the process of pipeline engineering, especially in petrochemical and other high temperature and high pressure and flammable and explosive pipes, the rational use of pipe fittings and the quality of the pipe itself is directly play a pivotal role.

Because of this, in the pipeline design, installation process, especially in the petrochemical industry, high temperature and high pressure and flammable and explosive pipeline project, whether from the design selection or processing, until the construction and installation of each link, design and manufacture and The installation unit personnel to strictly check to ensure that its selection, timber, manufacturing, installation and inspection of the quality, or in the installation and production process will cause difficult to assess the loss.

Stainless steel pipe fittings, especially the tee, elbow and the size of the first in the pipeline construction process more and more common, mainly because of its good shape, pressure and strong, simple welding and other characteristics to ensure that the pipeline Pressure capacity, so in the process of pipeline engineering, especially in petrochemical and other high temperature and high pressure and flammable and explosive pipes, the rational use of pipe fittings and the quality of the pipe itself is directly play a pivotal role.

The internal thread on the stainless steel pipe is usually tapped for tapping. As the stainless steel material viscosity is high, chip breaking performance is poor, so in the tapping process prone to chip scraping the workpiece thread or taper chute and other phenomena, affecting the processing efficiency and thread quality. In order to extend the service life of the tap, improve the quality of thread processing, should pay attention to the following points.

Design and manufacture of taps

(1) choose a better tap material. In the ordinary high-speed tool steel by adding special alloying elements, can significantly improve the wear resistance and toughness of the tap.

(2) coating the titanium nitride coating on the tapered thread surface can significantly improve the wear resistance, heat resistance and lubricity of the tap.

(3) appropriate to increase the tapered rake angle. But should be noted that, such as tap the rake angle is too large, in the retractable knife is likely to cause taps to break the edge and attack the thread polygonal.

(4) the appropriate increase in the amount of taper shovel. However, it should be noted that, such as the amount of shovel is too large, in the retracting when the chip is easy to plug into the cone after the phenomenon of the angle, and attack the thread finish is poor.

(5) a reasonable choice of tool heat treatment methods to take into account the hardness and toughness of the tap.

2 pre-Jjn-r of the bottom hole of the workpiece

(1) should be based on the principle of tapping as small as possible, the pre-processing workpiece at the end of the larvae L size, especially the American standard NPT thread and the British standard f, r thread, the taper of 1:16, and most stainless steel manufacturers According to the small diameter of the thread cast a straight hole as tapping the bottom larvae L, resulting in tapping the latter part of the larger processing volume, easily lead to the following adverse consequences:

① tapping torque larger, easy to break or taper blade taper;

② attack the thread finish is poor;

③ attack the cylindrical thread with a plug gauge diameter is too small, the reason is not the thread diameter is inconsistent, but because the chip scratching the thread, there is burr.

(2) the bottom larvae L size is best for the diameter of the thread to be processed with 0.1-0.2mm margin.

(3) before the tapping of the larvae L processing is best to use custom reamer. For the American standard Nf, r thread and the British standard f, r thread, should be processed into a taper at the end larvae L. At present, many companies use waste taps hand-wring the thread made of reamer, so that the waste tap can be used twice. But in the reformation of the reamer should pay attention to two issues: ① grinding the thread must be grinding out the corner; ② tapered blade front angle should be kept straight.