1, Selection of seamless tubing
When used in conjunction with tube fittings, selecting, handling, and installing tube correctly is essential for achieving reliability
The pipeline system is crucial.
When ordering pipes to be used with tube fittings, the following core elements should be considered:
◎Surface smoothness
◎ Material
◎ Hardness
◎ Wall thickness
2, Materials and Manufacturing Standards: Refer to ASTM A269
3, Cleaning and packaging
Chemical cleaning and passivation of tubing.
This type of tubing meets the requirements of ASTM G93-A standard in terms of non-volatile residue, and also complies with
Comply with the requirements of CGA G4.1 standard. The end of the tubing is protected by a polyamide nylon film and a polyethylene cap. card
The sleeve is individually packaged in a polyethylene bag.
4, Surface smoothness of seamless tubing
Numerous ASTM specifications cover the above requirements, but they often do not provide very detailed information on surface processing
narration. For example, there is a universal tubing specification described in ASTM A450 as follows (excerpted from this standard):
11. Straightness and smoothness
11.1 Processed tubing should be fairly straight and have smooth ends without burrs. They should have exquisite craftsmanship
Work. Surface defects (note) can be removed by grinding, as long as the smooth surface is maintained and the wall thickness is not reduced to
Less than the range allowed by this specification or product specifications. The outer diameter of the grinding point may decrease due to the amount of removal.
Note: Defects are any discontinuities or irregularities found on the tubing.
From a usage perspective, the higher the surface smoothness of the tubing, the better, generally not less than 320 mesh.
5, Suggested hardness
Seamless hydraulic tubing that meets ASTM A179 standard, with high-quality softening annealing or equivalent alternatives.
The hardness ranges from 72HRB to 80HRB. The tubing should be scratch free and suitable for bending and expanding.
