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GB/T 18876.2-2024: Standard practice for determining 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
Status: Valid GB/T 18876.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 18876.2-2024 | English | 359 |
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Standard practice for determining 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
| Valid |
GB/T 18876.2-2024
|
| GB/T 18876.2-2006 | English | 579 |
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Standard practice for determining the metallographic 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
| Valid |
GB/T 18876.2-2006
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PDF similar to GB/T 18876.2-2024
Basic data | Standard ID | GB/T 18876.2-2024 (GB/T18876.2-2024) | | Description (Translated English) | Standard practice for determining 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 | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H24 | | Classification of International Standard | 77.040.01 | | Word Count Estimation | 18,188 | | Date of Issue | 2024-08-23 | | Date of Implementation | 2025-03-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 18876.2-2024: Standard practice for determining 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
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 77.040.01
CCSH24
National Standard of the People's Republic of China
Replaces GB/T 18876.2-2006
Application of automated image analysis to determine the
Standard test methods for metallographic structure, inclusion content and grade
Part 2.Graphical representation of inclusion levels in steel
Analysis and stereological determination
Published on August 23, 2024, implemented on March 1, 2025
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Symbols 1
5 Test Method Overview 2
6 Device 2
7 Sampling 3
8 Sample preparation 3
9 Calibration 3
10 Step 3
11 Inclusion classification and grade calculation 4
12 Test Report 7
13 Precision and Bias 7
Appendix A (Informative) Typical Examples of Assessment Results 9
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is a follow-up to GB/T 18876 “Determination of metallographic structure, inclusion content and grade in steel and other metals by automatic image analysis”.
Part 2 of "Quasi-Test Method". GB/T 18876 has published the following parts.
--- Part 1.Image analysis and stereological determination of inclusion or second phase content in steel and other metals;
--- Part 2.Image analysis and stereological determination of inclusion levels in steel;
--- Part 3.Image analysis and stereological determination of carbide levels in steel.
This document replaces GB/T 18876.2-2006 "Determination of metallographic structure and inclusion content in steel and other metals by automatic image analysis"
Standard test methods for inclusion levels in steel - Part 2.Image analysis and stereological determination of inclusion levels in steel, GB/T 18876.2-
Compared with.2006, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The definitions of “aspect ratio”, “discontinuous string (strip) inclusions” and “continuous string (strip) inclusions” were deleted, and GB/T 10561 was added.
Defined terms (see Chapter 3, Chapter 3 of the.2006 edition);
b) Added the assessment method for non-traditional inclusions (see 5.8);
c) The evaluation method for precipitation phases such as titanium nitride, titanium carbonitride, boride, carbide, etc. has been changed (see 5.9, 5.9 of the.2006 edition);
d) “Significance and Use” was deleted (see Chapter 6 of the.2006 edition);
e) Added the requirements for high resolution and high storage capacity of image acquisition systems, and the requirement for software systems to have self-designed interfaces.
Seek (see Chapter 6, Chapter 7 of the.2006 edition);
f) Added the requirements for inclusion sampling (see Chapter 7, Chapter 8 of the.2006 edition);
g) "Sample Preparation" has been deleted (see Chapter 9 of the.2006 edition);
h) Deleted the heat treatment and sample clamp selection in sample preparation (see 10.2 and 10.3 of the.2006 edition);
i) The requirements for light source adjustment and illumination level setting as well as the instructions for grayscale setting have been deleted (see 11.2 and 11.3 of the.2006 edition);
j) Added the requirement of regular systematic inspection and confirmation of the reliability of the image analysis device and image detection software (see 9.2);
k) Added provisions for inserting manual methods when processing artifacts (see 10.8);
l) Added description of the deviation of the detection results caused by the grayscale threshold value and the detection field number (see 13.8);
m) Deleted the inclusion-related charts in GB/T 18254-2002 and ASTM E45-97 (2002) (see Appendix A and
Appendix B).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAC/TC183).
This document was drafted by. Daye Special Steel Co., Ltd. and Metallurgical Industry Information Standards Research Institute.
The main drafters of this document. Zhao Yongqiu, Yang E, Ji Xiao, and Zhang Zhicheng.
This document was first published in.2006 and this is the first revision.
Introduction
GB/T 18876 Standard test method for determination of metallographic structure, inclusion content and grade in steel and other metals by automated image analysis
The Law consists of three parts.
--- Part 1.Image analysis and stereological determination of inclusion or second phase content in steel and other metals.
Detailed procedures for image analysis and stereological determination of inclusion or second phase content in steel and other metals.
--- Part 2.Image analysis and stereological determination of inclusion levels in steel. The purpose is to establish image analysis and stereological determination of inclusion levels in steel.
Detailed procedures for analysis and stereological measurements.
--- Part 3.Image analysis and stereological determination of carbide levels in steel. The purpose is to establish image analysis and stereological determination of carbide levels in steel.
Detailed procedures for analysis and stereological measurements.
Application of automated image analysis to determine the
Standard test methods for metallographic structure, inclusion content and grade
Part 2.Graphical representation of inclusion levels in steel
Analysis and stereological determination
1 Scope
This document specifies the test method for quantitative determination of the grade of non-metallic inclusions using automatic image analysis in accordance with GB/T 10561.
Method overview, apparatus, sampling, specimen preparation, calibration, procedures, inclusion classification and grade calculation, specimen reporting, precision and bias.
This document applies to the assessment of inclusion levels in steel.
This document classifies inclusions based on light reflectivity, geometry, width, length, number and diameter.
Material ingredients.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 10561 Determination of non-metallic inclusions in steel - Rating chart microscopic examination method
GB/T 13298 Metal microstructure inspection methods
GB/T 18876.1 Standard test for determination of metallographic structure, inclusion content and grade in steel and other metals using automated image analysis
Methods - Part 1.Image analysis and stereological determination of inclusion or second phase content in steel and other metals
GB/T 30834 Evaluation and statistics of non-metallic inclusions in steel - Scanning electron microscopy method
3 Terms and definitions
The terms and definitions defined in GB/T 18876.1 and GB/T 10561 apply to this document.
4 Symbols
The following symbols apply to this document.
iA ---Class A inclusion level in a field of view;
iB ---Class B inclusion level in a field of view;
iC ---C-level of inclusions in a field of view;
iD ---D inclusion level in a field of view;
iDS ---DS inclusion level in a field of view;
L --- the total length of a certain type of inclusion in a field of view;
n --- the number of Class D inclusions in a field of view;
d --- Maximum diameter of DS inclusions;
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