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.
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