With the rapid development of China's oil industry, the demand for high-grade steel pipe is getting larger and larger, and the high-grade steel pipe must be quenched, so the research on overall quenching of steel pipe becomes very important. China Heavy Machinery Research Institute has developed two technologies of "dipping + internal spraying + rotating" and "external washing + internal spraying + rotating", and developed related quenching production lines with good results. Two kinds of quenching process have their own characteristics, the outer leaching jet quenching production line for oil well pipe, oil casing, drill pipe quenching, more conducive to the overall quenching of thin-walled steel; dip quenching quenching production line for wall thickness comparison Large high-performance thick-walled tube of the overall quenching, and its products are mainly used in defense, nuclear power, oil and gas and automotive industries. one. Quenching quenching production line Domestic commonly used thick-walled tube quenching equipment, there are some shortcomings, such as (1) thick-walled tube easy to quench, straightness, roundness difference, to the follow-up shaping difficult; (2) both inside and outside the pipe can not be Quenching, resulting in low martensite content, hardness uneven; (3) high operating costs, poor security. In response to the above shortcomings, the hospital independently developed, manufactured the world's first set of the world's first set of "immersion + rotary + spray" quenching process on the wall thickness of more than 20 mm quenching the overall quenching of the quenching quench line. The technological route is: the steel pipe heated by the quenching furnace reaches the blocking device → the pressing device installed on the lifting rotating device rapidly compresses the steel pipe → the support wheel drives the steel pipe to rotate rapidly; the left and right lifting cylinders drive the frame beam to rapidly immerse the steel pipe into the quenching water → nozzle within the nozzle to spray the steel pipe → quenching end, spray stop → left and right lifting cylinder will raise the frame beam → steel pipe rolling to the blocking device by the blocking device by root of the steel pipe turned to the empty water support → empty water The device is lifted to raise one end of the steel pipe for empty water → compressed air to further dry the quenched water in the steel pipe → the stepper conveyer gradually conveys the steel pipe to the discharging roller way → completes the quenching of the steel pipe. This kind of dipping quenching unit adopts the new technology of "dipping + rotating + internal spraying" for the first time to integrally quench large diameter and thick wall pipe and solve the technical problem of quenching and quenching of large diameter thick wall steel pipe. The following significant effects have been achieved: (1) As the overall steel pipe into the water, high-speed rotation, more auxiliary support, the straightness of the pipe greatly increased, less than 2 mm / m, to meet the product requirements. (2) Adopting the inner spray nozzle with mobile rotation function, which reduces the ellipticity of the head of the steel pipe and is favorable for the pipe diameter sizing. (3) In-line quenching process makes the quenching process more flexible, and the mechanical properties of the steel pipe are more uniform. The martensite conversion rate after quenching exceeds 90% and even reaches 95%. The hardness error of the full-length steel pipe and the wall thickness direction is less than or equal to 3 HRC. two. "Outer shower + spray + rotation" quenching process. This process is for thinner wall thickness steel pipe. The steel pipe is heated to about 1000 ° C by a quenching furnace and is sent to the to-be-material position by the feed roller. The loading device lifts the steel pipe and turns it over to the support wheel rotating slowly with the rotating device. The pressure on the sprinkler rack Tight device quickly pressed steel pipe, the rapid rotation of the rotating device to drive the rapid rotation of the steel pipe is located directly above the steel pipe to the outer surface of the pipe uniformly sprayed water, while installed in the end of the steel pipe spraying device to the pipe wall spray. This steel pipe inside and outside surfaces are evenly quenched. The above steel pipe knowledge by 51 steel pipe network released.
UPVC pipe and fitting is produced by material of unplasticized polyvinyl chlorde, according to standards of ANSI SCH80,SCH40,DIN PN10,PN16, JIS10K, different pressure rate and class for different application. it has good property of corrossion resist, light weight, easy installation and maintaince, cost low, etc. pressure rate PN10 PVC pipe and fitting is it suitable for water supply, agriculture irrigation, fish farm, pool water system, water treatment, ect.
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Connection: socket
Standard: DIN PN16 ANSI SCH80
Pressure rate: PN16 ANSI SCH80
Items: Coupling, elbow, tee, reducer, flange, bushing, union, reducing tee, female coupling, made adaptor, end cap.
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