Review on development of standards for determination of hot crack index of iron ore
The hot crack performance of lump ore is generally characterized by the hot crack index,which is an important influencing factor for the raw materials of blast furnace.In order to help researchers and inspectors better determine the hot crack index of iron ore,by comparing the latest progress of domestic and foreign standards for the determination of iron ore hot crack index,the problems and main revisions in the previous versions of ISO 8371 and GB/T 10322.6 are analyzed and sorted out,and it is believed that the main problems existing in GB/T 10322.6-2004 are:the preparation process of the sample is cumbersome,the test process design is unreasonable,and the expression of the test results is not rigorous.The technical content of the previous standards is compared and analyzed from such three aspects as sample preparation process,hot crack test process(weighing,heating,cooling,screening)and test result presentation,and GB/T 10322.6-2022 is analyzed chapter by chapter according to the scope,principle,sample preparation,test equipment,test steps,and result expression;the editorial and technical modification suggestions are put forward for GB/T 10322.6-2022.GB/T 10322.6-2022 should be revised in accordance with ISO 8371:2024 in due course,and the remaining issues of ISO 8371:2024 should be addressed.A description of equipment specifications of the standard should be added;the size and temperature control accuracy of the heating furnace,and the size,thickness and material of the test sample box are clarified;the charging steps of the hot crack test are clarified,such as the number of layers of sample paving,the number of test sample boxes,etc.;the heating temperature and heating rate of the hot crack test are clarified,and the screening steps of the hot crack test and the display of the hot crack test results are optimized.
万方数据
维普
