Download or read book GB T 40304 2021 Translated English of Chinese Standard GBT40304 2021 written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2022-03-06 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Document specifies the principles, specimen preparation, test equipment, test methods and test reports for the content of non-metallic inclusions in billets. This Document is applicable to the test of non-metallic inclusions (with dimensions no less than 30??m) in billets that have not been rolled, deformed or otherwise treated. Non-metallic inclusions with a size less than 30??m can also be used for reference when the equipment allows.