2—1999 are widely used by pipe manufacturer and due to the discrepancy among standards or shortage of itself,there are many problems occur such as disunity of steel grade,for hydrostatic test,testing pressure may be different for same size and steel grade,for bend test,there are many choices for module diameter and so on.

The study focuses on such aspects as change of the mechanical properties of the X120 steel plate, the forming characteristics, weldability and softening of the heat af- fected zone(HAZ)of JCOE, the comparative testing with rectangular and round tensile test pieces and the influ- ences by different welding material proportions and welding thermal inp.

The primary factors influenced on the heat treatment parameters of grade E steel are the quenching temperature and its holding time as well as temper temperature and its holding time.

Heat treatment technique of forged grade E steel coupler yoke has been studied in this paper, in which the real-time temperature measuring method is utilized to determine the reasonable heat treatment regulation for mass production of forge.

Test research of stamping property for super steel plate;

Effect of cooling rates and deformation on microstructure and mechanical properties of 700MPa super steel;

Tensile test research of stamping property for super steel plate;