GB/T 25746-2010Metallographic test for malleable cast iron (English PDF)
可锻铸铁金相检验
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 23, 2010
Implementation date
June 1, 2011
Scope
GB/T 25746-2010 is the English-translated version of 可锻铸铁金相检验.
GB/T 25746-2010 is the Chinese standard "Metallographic test for malleable cast iron". Its scope clause reads: This standard specifies the method for assessment under microscope malleable iron microstructure.
The standard form of graphite, graphite shape malleable iron grade, distribution of graphite, graphite particles number, shape pearlite, pearlite residual amount of points Level, the amount of residual cementite grading, regulates skin thickness evaluation method, and lists the corresponding rating FIG.
This standard applies to the assessment of malleable iron metallurgical microstructure.
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Document preview — GB/T 25746-2010
National Standard of the People's Republic of China
- ICS
- 77.080.10
- Classification
- J 31
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
1 Scope
This standard specifies the method for assessment under microscope malleable iron microstructure.
The standard form of graphite, graphite shape malleable iron grade, distribution of graphite, graphite particles number, shape pearlite, pearlite residual amount of points
Level, the amount of residual cementite grading, regulates skin thickness evaluation method, and lists the corresponding rating FIG.
This standard applies to the assessment of malleable iron metallurgical microstructure.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 13298 metal microstructure inspection method
Figure 3 test items and ratings
3.1 Classification and characteristics of graphite shape
3.1.1
Observation of graphite shape shall be made on not etched metallographic sample. 100 times magnification.
3.1.2
There are different shapes, such as graphite, graphite should observe the estimated percentage of each shape in the same sample, and in turn indicated in the report.
3.1.3
five types of graphite shape of the distribution points, see Table 1 and Figures 1 to 5.
Table 1 Classification and characteristics of graphite shape
Name Drawing No. features
Figure 1 spherical graphite denser, approximately circular shape, perimeter irregularities
Flocculent cotton group similar to Figure 2, more irregular shape
Figure 3 flocculent relatively loose group flocculent graphite
Poly worm-like graphite loose FIG. 4, a worm-like graphite gathered together
Figure 5 is composed of a lot of dendrites small clip-like, point-like graphite aggregate dendritic distribution
Figure 1 100 × 2 100 × FIG.
GB/T 26648-2026 | GB/T 26649-2025 | GB/T 25748-2025 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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