Study on low temperature toughness and microstructure on base metal and welded joint of X80 pipeline steel;

Influence of different thermal cycle on low temperature toughness in coarse-grained HAZ of 9Ni steel

Results show that 20MnMoD forging at-50 ℃ has excellent low temperature toughness,it is adapted to-50 ℃ 15MnNiNbDR steel plate for low temperature pressure vessels.

Effect of CO_2 content on low-temperature toughness of weld metal of high strength steel in MAG welding;

A series of Charpy impact tests were done to investigate low-temperature toughness of its weld joints,and the values of toughness were measured at different temperatures to make sure of some temperature ranges that normally correspond to different toughness values.

This steel has been verified excellent in weldability and low-temperature toughness,and no crack is formed in t≤50 mm plates after welding even without preheating or with slight preheating before welding.

The lathing martensite increases with the improvement of quenching temperature,the yield strength tempered at 600 ℃ improves,but the cryogenic toughness of 9Ni steel decreases.

The heat treatment processes of large scale forge were simulated and the effects of the different heat treatment processes on the cryogenic toughness at -30 ℃ of Steel 2.

The effect of ESR on cryogenic toughness was investigated by means of TEM and SEM.

Study the low-temperature modification of PCB, including mechanical property to find the influence of the different low-temperature on impact strength, flexural strength, shear strength of PCB.

Research progress of low temperature performance for lithium-ion batteries;

Research on low temperature performance of modified asphalt and mixture of bridge expansion joints;

Influence factors analysis of the low temperature performance of SBS modified asphalt;