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CK20 Steel Precision Honed Tube

CK20 Steel Precision Honed Tube

CK20 Precision Tube advantage: 1. Honing Seamless Pipe Improve the surface roughness, and the roughness can almost reach Ra less than 0.04. 2. Correct the roundness, the ellipticity can be less than 0.02 mm. 3. honed tubing improve the surface hardness, eliminate the stress deformation, hardness...

CK20 Precision Tube advantage:
1. Honing Seamless Pipe Improve the surface roughness, and the roughness can almost reach Ra less than 0.04.
2. Correct the roundness, the ellipticity can be less than 0.02 mm.
3. honed tubing improve the surface hardness, eliminate the stress deformation, hardness HV 4° or higher
4. After processing, the residual stress layer shall improve the fatigue strength by 30%.
5. Improve coordination quality, reduce wear and tear, and extend the service life of spare parts, but the processing cost of spare parts is reduced.


Precision honing tube Dimensional tolerance

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Product process

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A kind of cold drawn precision honing tube manufacturing method includes the following steps:
(1). heating: 27 simn tube billet heating to 1200~1290 ℃ in the annular furnace, heating time is 4~5 hours, so as to ensure uniform tube billet heating.
(2). perforation: heat pipe billet by the piercing mill perforation, perforation after the formation of the capillary temperature control at 1150~1230 ℃, and mesh perforated eccentricity control and control tube billet surface quality.

(3). annealing, introduces tube billet in continuous annealing furnace for annealing, and control the annealing temperature is 600~720 ℃, the annealing time of 70~70 min, by annealing hardness (HV) annealing billet for 210~219.

(4). and sprayed borax: borax spraying device to nitrogen and borax by spiral nozzle blow hole to remove oxide skin to wool tube and in wool tube filled with nitrogen gas, its main function is to remove hair tube residual scale, at the same time on the inner surface of the capillary form a layer of film, prevent capillary further oxidation.
(5). hot-rolled: introducing annealing pipe mill hot rolling, hot rolling temperature is 1260~1270 ℃, get rolling tube.
(6). pipe: rolling tube with mandrel release, to the next working procedure, make sure to take off the tube process of rolling pipe reducing rate between 0~2%.
(7). the stress relieving: introduce the rolling tube heating and heat preservation in heating furnace, the furnace after cooling, by annealing billet, the purpose is to ensure the strength of the steel tube, when the annealing temperature is too high, strain recovery processing, can't get the effect of strain hardening, annealing temperature is 550~650 ℃, can get the effect of strain hardening, in order to remove the strength of the cold rolled steel pipe deviation, cold rolled steel tube furnace to keep time for 10~40 minutes.
(8). pickling treatment: the annealing pipe pickling, remove the rust on the surface of the skin, hydrochloric acid concentration: 7~19%, pickling time: 35~60 minutes, again neutralization pool roll, roll number: 2~3 times, and liquid PH: 9~10, then through clear water reserviors roll, roll number: 2~3 times.
(9). phosphating treatment: on the surface of tube billet forming the chemical formation of zinc phosphate film coating, zinc phosphate concentration: 20~30%, the phosphating liquid temperature: 68~75 ℃, phosphating time: 10 to 20 minutes, phosphating liquid free acidity: 4~7, total acidity phosphating fluid: 45~75.
(10). saponification process: on the coated metal soap lubricating film coating, such as formation, saponification temperature: 55~75 ℃, saponification time: 8 to 15 minutes, saponification liquid PH: 8~9.
(11). a cold drawn: will stay cold drawn pipe cold drawing processing, cold drawing process, the mould plug head and pipe inner span: 3~5 mm, maximum drawing force pulling machine: 350~450 t, saponification tube drawing before parking time: 72~96 h.
(12). secondary cold drawn: after a cold drawn twice cold drawing process of cold drawn pipe, cold drawing process, the mould plug head and pipe inner span: 2~4 mm, maximum drawing force pulling machine: 400~500 t, after a cold drawn before cold drawn tube of parking time: 12~24 h.
(13). heat treatment: use after quenching and tempering heat treatment process, quenching temperature is 800~850 ℃, quenching medium is water, tempering temperature at 550~550 ℃, reduce the residual stress of cold drawn pipe.
(14). honing: choose digital honing machine, rotary workpiece, processing form of honing head for reciprocating motion, reach the cylindricity: 0.01~0.02 mm, size deviation: 0.01~0.02 mm, roughness: Ra0.25~0.35 high standards of accuracy.
(15). hot straightening processing: heat preservation in the low temperature tempering furnace 45 to 60 minutes, and then to hot straightening processing, hot straightening temperature 550~650 ℃, the yield strength (MPa): 898, tensile strength (MPa): 912, hardness (HV): 250, the wall thickness tolerance: 8%, outer diameter out of roundness: 0.3%, wall thickness variability: 6%, straightness, cold drawn precision honing tube 0.30 mm/m.


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