seamless steel pipe deformation process can be summarized as three stages: extension, perforation and finishing. Hot rolled seamless steel pipes is relative to the cold-rolled, cold rolling is below the recrystallization temperature of the rolling and hot rolled is carried out at above the recrystallization temperature of the rolling. Hot rolled seamless steel pipe can damage the refinement of the crystal grains of the steel, cast microstructure of the steel ingot and eliminate the defects of the microstructure so that the the steel organization compacting, improves the mechanical properties. This improvement is reflected in the rolling direction so that the steel is no longer at a certain extent isotropic; pouring the formation of bubbles, cracks and osteoporosis, under high pressure and temperature can also be welded together.
Seamless Pipes,Erw Steel Pipe,Carbon Seamless Steel Pipe,Cold Rolled Precision Steel Pipe Shandong Guanzhou Iron and Steel Group Co., Ltd. , https://www.guanzhousteel.com
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Primary and secondary school students will intensify urban congestion in Beijing next week
Primary and secondary school students will be aggravated by the congestion in Beijing city next week. Diesel generator | Diesel generator price / 2010-08-28
The Beijing Traffic Control Department reported on the 27th that next week the city’s primary and secondary schools will begin. It is expected that peak traffic will increase in the morning and evening, and the traffic situation around the campus will change significantly.
The school at Zhongguancunqiao District of the North Fourth Ring Road is centralized and the parents who pick up and drop off the children are traveling here. Especially when they drive out of the main road, they are prone to congestion, which in turn affects the main road vehicles. Judging from the past, students often get stuck in traffic during the school and school days, Zhengyangqiao District in the West Fourth Ring Road, Xihuangchenggen Intersection in Ping An Street, Yongding Road in Haidian District, and Wanquan River Road. It is recommended that other crossing vehicles should avoid the above road sections from 7:00 to 8:00, 16:30 to 17:30.
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