The review meeting of four test method standards of the National Endurance Standards Committee was held
Apr 01,2025
The review meeting of four test method standards organized by the National Resistant Standard Committee was successfully held on March 12-14, 2025 in Wuhan City, Hubei Province. A total of more than 40 representatives from the National Refractory Standards Committee, production enterprises, design units, colleges and universities, inspection organizations attended the meeting.
The review will review three national standards, namely: “non-conformable refractory materials wet spraying technology for the preparation of refractory spray material test pieces” (developed), “weight method, photometric method and titrimetric method for the determination of sulfur in the refractory materials” (developed), “refractory materials high temperature compressive strength test method” (revised GB/T 34218-2017), the industry standard of one: "refractory materials Thermal conductivity test method (Water Flow Plate Method)" (revised YB/T 4130-2005). The review will be conducted by Wang Zhaomin, Senior Engineer, Chairman of the Test Methods Sub-Technical Committee of NRSC and Deputy General Manager of Sinosteel Luonai Technology Co.
Refractory Jet Material Test Piece Prepared by Wet Spraying Technique for Unshaped Refractories“ and ”Test Method for High Temperature Compressive Strength of Refractory Materials" are led by Wuhan University of Science and Technology (Wuhan University of Science and Technology). Among them, the “Unshaped refractory materials prepared by wet jetting technology refractory jet test blocks” is modified by ISO 18886:2016(E), which applies to refractory materials that can be transported through pipelines after mixing with the total amount of water or other liquids required. The principle of the test is to convey the refractory material mixed homogeneously with water by appropriate means to a nozzle (at which compressed air may be passed if necessary), and then to spray the mixture into a mold, and then to add a coagulant promoter at the nozzle or in the spray hose, as required, in order to cause the mixture to adhere to the surface of the mold without flowing downwards. ISO 22685:2021(E) has been adopted as a revision of the Methods of Tests for Compressive Strength of Refractory Materials at High Temperatures. The technical differences with the previous version are: changed the terms and definitions of the specimen failure requirements; added thermocouple temperature measurement end position requirements, gasket provisions, specimen height measurement requirements; changed the deformation measurement device and the provisions of the holding time; changed the dense refractory material specimen failure requirements. The standard applies to the determination of high-temperature compressive strength of refractory materials, the test principle is to specify the rate of heating the specimen to the test temperature, the known size of the specimen with the specified rate of pressurization to apply load until failure, record the maximum load, and then calculate the high-temperature compressive strength based on the specimen to withstand the maximum load and the average compressed area.
Determination of Sulfur in Refractories by Gravimetric, Photometric and Titrimetric Methods“ and ”Test Methods for Thermal Conductivity of Refractories (Water Flux Plate Method)" were developed and revised by Sinosteel Luoyang Refractories Research Institute Co. Among them, the “gravimetric, photometric and titrimetric method for the determination of sulfur in refractory materials” modified using ISO 22016: 2015, the standard applies to the refractory materials in the mass fraction of less than 5% of the sulfur content (including sulfur in the refractory materials, sulfides, sulfates, sulfites, etc.) determination. Refractories Thermal Conductivity Test Methods (Water Flow Plate Method)" applies to the determination of thermal conductivity of refractory materials with hot surface temperatures ranging from 200 °C to 1300 °C and thermal conductivity ranging from 0.03 W(m·K)-1 to 2 W(m·K)-1. The standard and the previous version of the technical differences are: the addition of the center heater unit time water flow rate will affect the results of the note and can be replaced by other constant pressure device instead of a constant pressure water tank provisions; change the formula for calculating the thermal conductivity coefficient; add a non-conformal refractories, pre-fired or unpre-fired dry specimens of the heat treatment requirements.
In accordance with the review process, the standard drafting unit representatives reported on the source of the subject, the process of making and revising the standard briefly and the standard summary of the opinions of the draft comments processing and so on. Participating experts in the scientific and rigorous, conscientious and responsible attitude to the preparation of the standard description and the submission of the preparation of the format, the principle of the test method, equipment and steps to carry out a rigorous review of the content of the word by word, on the basis of consensus formed on the standard recommendations for modification, the delegates unanimously agreed to the revised standard submission can be reported to the standardization authorities.
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