My countrys petrochemical industry proposed HG/T50634-2009 Fasteners for Steel Pipe Flanges. This standard refers to the American ASTM or ASME standard and adds new and unique technical clauses. It is suitable for a class of fastener products used in
Expressway, referred to as expressway, refers to a highway dedicated to high-speed driving of automobiles. As of December 28, 2018, the total mileage of expressways in China has reached 140,000 kilometers, ranking first in the world. The steel specif
A tunnel is an engineering building buried in the ground, and it is a form of human use of underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, mining tunnels and so on. The structure of the tunnel inc
The steel bars generally used for bridges are: ordinary steel du bars: R235, HRB335, HRB400, KL400. Prestressed dao steel bars: stranded zhuan, steel wire, fine-rolled threaded shu steel. For details, please refer to: Technical Specification for Cons
In order to adapt to the continuous development of high-speed rail construction, the annual investment in railway construction has continued to increase. The total scale of Chinas railway fixed asset investment plan in 2010 is 823.5 billion yuan, of
