GB/T 30834-2014 (English Version) PDF

Standard No.: GB/T 30834-2014
Language: Chinese, Available in English version
Release Date: 2014
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Status: Be replaced 2023-02
Replace By: GB/T 30834-2022
Latest: GB/T 30834-2022

Scope: This standard introduces the procedures for size distribution statistics, chemical classification and rating of non-metallic inclusions in steel using scanning electron microscopy (SEM). The scanning electron microscope is equipped with X-ray energy spectrum analysis and automatic image analysis functions. This standard recommends three inspection methods. Method 1 mainly classifies inclusions according to their morphology. Method 2 mainly classifies inclusions according to their chemical composition. Methods 1 and 2 are applicable to the microscopic assessment of non-metallic inclusions larger than 2 μm in rolled or forged steels with a compression ratio greater than or equal to 3. Method three is used to determine the specific details of a certain type of inclusions, such as volume fraction, number fraction and other stereological parameters, and is suitable for the statistical classification of inclusions of all sizes (including below 2 μm) in various slabs or steels. This standard is only a recommended inspection method for non-metallic inclusions, and does not specify the acceptance level of any steel. This standard does not address safety issues related to the application. It is the user's responsibility to establish correct safety and health regulations and to determine the applicability of the regulations before applying this standard.

GB/T 30834-2014 Referenced Document

GB/T 10561-2005 Steel.Determination of content of nonmetallic inclusions.Micrographic method using standards diagrams
GB/T 13298 Inspection methods of microstructure for metals
GB/T 17359-2012 Microbeam analysis.Quantitative analysis using energy dispersive spectrometry
GB/T 18876.1 Standard practice for determining the metallographical constituent and inclusion content of steels and other metals by automatic image analysis-Part 1: Determining the inclusion or second-phase constituent content of steels and other metals by automatic
GB/T 18876.2-2006 Standard practice for determination the metallographical constituent and inclusion content of steels and other metals by automatic image analysis.Part 2:Determining the inclusion ratings of steels by automatic image analysis and stereology
GB/T 27788 Microbeam analysis—Scanning electron microscopy—Guidelines for calibrating image magnification*， 2020-06-02 Update
GB/T 30067 Standard terminology relating to metallography

2022 GB/T 30834-2022 Rating and classifying of inclusions in steel—Scanning electron microscope method
2014 GB/T 30834-2014 Standard test methods for rating and classifying inclusions in steel.Scanning electron microscope