This article briefly describes the development process of the heat resistance Cr-Mo steel welding material for the gasifier used for 300,000 Ton/Year ammonia project,which includes the technical specification,the form...This article briefly describes the development process of the heat resistance Cr-Mo steel welding material for the gasifier used for 300,000 Ton/Year ammonia project,which includes the technical specification,the formulation selection and all test results.The successful development of this welding material with excellent high temperature properity as well as low temperature toughness ( A KV >54J,at-20℃),not only satisfies the design and fabrication requirements of the gasifier,but also changes the situation that the welding material can only depend on import in ths past,which saves the country plenty of foreign exchanges.展开更多
The surface of 1Cr5 Mo heat-resistant steel welding joint was processed with CO2 laser, and the corrosion behaviors before and after laser heat treatment(LHT) were investigated in the salt spray corrosion environments...The surface of 1Cr5 Mo heat-resistant steel welding joint was processed with CO2 laser, and the corrosion behaviors before and after laser heat treatment(LHT) were investigated in the salt spray corrosion environments. The microstructures, phases, residual stresses and retained austenite content of 1Cr5 Mo steel welding joint before and after LHT were analyzed with optical microscope and X-ray diffraction, respectively. The cracking morphologies and chemical compositions of corrosion products after salt spray corrosion were analyzed with field emission scanning electron microscopy(FESEM) and energy disperse spectroscopy(EDS), respectively, the polarization curves were measured on a PS-268 A type electrochemical workstation, and the mechanism of corrosion resistance by LHT was investigated as well. The results show that the passive film of original sample is destroyed owing to the corrosive media penetrating into the subsurface, resulting in the redox reaction. The content of residual austenite in the surface and the self-corrosion potential are increased by LHT, which is contributed to improving the capability of salt spray corrosion resistance.展开更多
文摘This article briefly describes the development process of the heat resistance Cr-Mo steel welding material for the gasifier used for 300,000 Ton/Year ammonia project,which includes the technical specification,the formulation selection and all test results.The successful development of this welding material with excellent high temperature properity as well as low temperature toughness ( A KV >54J,at-20℃),not only satisfies the design and fabrication requirements of the gasifier,but also changes the situation that the welding material can only depend on import in ths past,which saves the country plenty of foreign exchanges.
基金Project(CXLX14-1098)supported by Jiangsu Province Postgraduate Scientific Research Innovation Program,China
文摘The surface of 1Cr5 Mo heat-resistant steel welding joint was processed with CO2 laser, and the corrosion behaviors before and after laser heat treatment(LHT) were investigated in the salt spray corrosion environments. The microstructures, phases, residual stresses and retained austenite content of 1Cr5 Mo steel welding joint before and after LHT were analyzed with optical microscope and X-ray diffraction, respectively. The cracking morphologies and chemical compositions of corrosion products after salt spray corrosion were analyzed with field emission scanning electron microscopy(FESEM) and energy disperse spectroscopy(EDS), respectively, the polarization curves were measured on a PS-268 A type electrochemical workstation, and the mechanism of corrosion resistance by LHT was investigated as well. The results show that the passive film of original sample is destroyed owing to the corrosive media penetrating into the subsurface, resulting in the redox reaction. The content of residual austenite in the surface and the self-corrosion potential are increased by LHT, which is contributed to improving the capability of salt spray corrosion resistance.
