BS ISO 21736:2020 pdf free.Refractories一Test methods for thermal shock resistance.
BS ISO 21736 This document specifies the principle, equipment, test pieces, procedures, result expression and test report of test methods for thermal shock resistance of refractories. Three test methods are included in this document. Each one is applicable to a different product type and their test results are not comparable.The test method, the test temperature and the test condition are intended to be negotiated by corresponding parties. This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. After rapid heating, take out the test pieces and immerse the hot end of the test pieces 50 mm土5 mm deep in the flowing water of 5 °C to 35 °C. The immersed test piece end shall be 2 20 mm from the water channel bottom. The temperature rise between inflow water and outflow water shall be≤10 °C by adjusting the water flow rate. During quenching, close the furnace door in time to keep the furnace temperature at the test temperature土10。C.After water quenching for 3 min in the channel, take out the test pieces rapidly and leave the test pieces in air for2 5 min. Measure the undamaged area of the hot end surface [114 mm x 64 (74) mm] of the test pieces in grid number A2 and record.
When the test pieces are left in air for≥5 min and the furnace temperature returns to the test temperature, transfer the hot end of the test pieces into the furnace rapidly. Repeat these procedures until (50土5) % of the hot end surface is damaged. Record the thermal shock cycle number or end the test at the negotiated cycles.During the test, the mechanical damage between the test pieces and the furnace door or the water channel is not permitted.BS ISO 21736 pdf download.