GB/T 13305-2024 PDF English
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| GB/T 13305-2024 | English | 440 |
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Method for determining content of the α-phase in stainless steels
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| GB/T 13305-2008 | English | 150 |
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Micrographic method for determining area content of the α-phases in stainless steel
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| GB/T 13305-1991 | English | 359 |
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Austenitic stainless steels. Determination of area content of the alpha-phase. Micrographic method using standard diagrams
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GB/T 13305-2024: Method for determining content of the α-phase in stainless steels---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT13305-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.99
CCS H 24
Replacing GB/T 13305-2008
Method for determining content of the α-phase in stainless
steels
Issued on. MAY 28, 2024
Implemented on. DECEMBER 01, 2024
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Selection and preparation of specimens... 6
5 Determination method of α-phase content... 10
6 Test report... 15
Appendix A (Normative) Austenitic stainless steel α-phase content rating chart... 16
Appendix B (Normative) Assessment diagram of austenite-ferrite duplex stainless steel
α-phase content... 19
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 13305-2008 " Method for determining content of the α-
phase in stainless steels". Compared with GB/T 13305-2008, in addition to structural
adjustments and editorial changes, the main technical changes are as follows.
a) ADD the term and definition of "α-phase in stainless steel" (see Chapter 3);
b) CHANGE the schematic diagram of steel sampling method (see Figure 1; Figures
1 ~ 5 of the 2008 edition);
c) ADD the corrosion method of cupric chloride hydrochloric acid alcohol solution
[see 4.3a)];
d) ADD the mean value, standard deviation, confidence level, relative error formula
for the determination of α-phase content in austenitic-ferritic duplex stainless
steel (see 5.2.1.2; 4.1.2 of the 2008 edition);
e) CHANGE the magnification of the determination of α-phase content in austenitic
stainless steel (see 5.2.2.1; 4.1.1 of the 2008 edition);
f) CHANGE the comparison method rating limit table for the determination of α-
phase content in austenitic stainless steel (see 5.2.2.1; 4.1.1 of the 2008 edition);
g) ADD the table of α-phase types and contents in austenitic-ferritic duplex stainless
steel (see 5.2.2.2);
h) ADD the key operating instructions and calculation formulas for the quantitative
grid determination method (see 5.2.3);
i) ADD the key operating instructions for the automatic image analysis
determination method (see 5.2.4);
j) ADD the ferrite instrument determination method (see 5.3);
k) CHANGE the requirements for the content of the test report (see Chapter 6;
Chapter 5 of the 2008 edition);
l) CHANGE the standard rating chart for the metallographic determination method
of α-phase content in austenitic stainless steel (see Appendix A; Appendix A of
the 2008 edition);
m) CHANGE the standard evaluation chart for the metallographic determination
method of α-phase content in austenitic-ferritic duplex stainless steel (see
Appendix B; Appendix B of the 2008 edition).
Please note that some 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 shall be under the jurisdiction of the National Technical Committee for
Steel Standardization (SAC/TC 183).
The drafting organizations of this document. China Iron and Steel Research Institute
Co., Ltd., Shougang Group Co., Ltd., Huzhou Yongxing Special Stainless Steel Co.,
Ltd., Fushun Special Steel Co., Ltd., Qingtuo Group Co., Ltd., Sichuan Liuhe Special
Metal Materials Co., Ltd., Metallurgical Industry Information Standards Research
Institute.
The main drafters of this document. Li Jikang, Wu Zhaobo, Ju Xinhua, Lian Xuekui,
Du Min, Wu Minghua, Gu Qiang, Wen Juan, Shi Liming, Bian Feng, Yan Chengming,
Jin Weiqiang, Zheng Lanzhen, Xiao Lei.
This standard replaces the standard previously issued as follows.
- It was first published in 1991 as GB/T 13305-1991;
- The first revision in 2008 incorporated the content of GB/T 6401-1986
"Micrographic method for determining area fraction of the alpha-phases using
charts in ferritic-austenitic stainless steels";
- This is the second revision.
Method for determining content of the α-phase in stainless
steels
1 Scope
This document specifies the selection and preparation of specimens for the
determination of α-phase content in stainless steel, the determination method, the test
report.
This document is applicable to the determination of α-phase content in austenitic
stainless steel and austenitic-ferritic duplex stainless steel.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies to this document.
GB/T 1954 Methods of measurement for ferrite content in austenitic Cr-Ni stainless
steel weld metals
GB/T 13298 Inspection methods of microstructure for metals
GB/T 15749 Measuring method in quantitative metallography
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 30067 Standard terminology relating to metallography
YB/T 4402 Micrographic method for determining content of δ-ferrite in martensitic
stainless steel
3 Terms and definitions
The terms and definitions defined in GB/T 30067 and the following terms and
definitions apply to this document.
3.1
α-phase in stainless steel
The ferrite phase in stainless steel, which has a body-centered cubic (bcc) crystal
structure.
4 Selection and preparation of specimens
4.1 General
4.1.1 The specimens are cut from the steel in the delivery state. The sampling location
and quantity shall be in accordance with the relevant product standards or agreements.
4.1.2 The test surface of the specimen of rolled steel is a longitudinal section parallel to
the rolling direction, wherein one side shall coincide with its axis.
4.1.3 The specimens shall be cut mechanically in a cold state. If cutting is done by gas
cutting or hot cutting, the metal melting zone, plastic deformation zone, heat affected
zone shall be completely removed. The distance between the cutting surface and the
inspection surface depends on the cutting method, which is generally not less than 0.5
mm.
4.2 Sampling method
4.2.1 Sampling method for round steel and square steel
4.2.2 Sampling method for steel pipes
The sampling method for steel pipes is shown in Figure 1d).
4.2.3 Sampling method for steel plates, steel strips, flat steels
The sampling method for steel plates, steel strips, flat steels is shown in Figures 1e) and
1f).
4.3 Specimen preparation and etching
The specimen preparation shall be carried out in accordance with GB/T 13298.It is
recommended to use one of the following etching methods for specimen etching, which
shall be based on the clear display of α-phase structure.
5 Determination method of α-phase content
5.1 General
5.1.1 The following method is usually used to determine the α-phase content of steel.
The method used is determined by the product standard or the agreement between the
two parties.
5.1.2 The choice of determination method and its accuracy depend on the product type,
microstructure, shape of the component.
5.2 Metallographic method
5.2.1 General
5.2.1.1 Determination of α-phase content in austenitic stainless steel
The determination of α-phase content in austenitic stainless steel adopts the most severe
field of view method. Place the specimen under the bright field of the metallographic
microscope for observation; first use a lower magnification to fully observe the entire
inspection surface; select the field of view with the highest α-phase content on the
inspection surface for evaluation; ensure that the actual field of view is a square with a
side length of 0.24 mm.
5.2.2 Comparison method with standard rating chart
5.2.2.1 Determination of α-phase content in austenitic stainless steel
Select the field of view with the highest α-phase content on the entire inspection surface;
compare it with the standard rating chart.
5.2.3 Quantitative grid determination method
The quantitative grid determination method is used to determine the α-phase content in
accordance with GB/T 15749.
5.3 Ferrite meter determination method
For special cases such as on-site rapid inspection, the ferrite meter can be used to
evaluate the α-phase content in stainless steel after mutual agreement. This method
cannot be used as an arbitration method. The ferrite meter and its own proofing samples
shall be calibrated regularly (usually no more than one year), using a Magni meter or a
secondary standard sample. Before the measurement, a standard sample with the same
α-phase content as the sample to be tested shall be used to calibrate the ferrite meter.
The surface oil and rust layer of the inspection surface shall be removed.
6 Test report
The test report shall include (but not limited to) the following items.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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