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Position: Chinese Standard in English/GB/T 30574-2021
GB/T 30574-2021   Safety of machinery—Implementation criteria for safeguarding (English Version)
Standard No.: GB/T 30574-2021 Status:valid remind me the status change

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Standard No.: GB/T 30574-2021
English Name: Safety of machinery—Implementation criteria for safeguarding
Chinese Name: 机械安全 安全防护的实施准则
Chinese Classification: J09    Hygiene, safety and labor protection
Professional Classification: GB    National Standard
Issued by: SAMR, SAC
Issued on: 2021-12-31
Implemented on: 2022-7-1
Status: valid
Superseding:GB/T 30574-2014 Safety of Machinery - Implementation Criteria for Safeguarding
Language: English
File Format: PDF
Word Count: 16500 words
Price(USD): 495.0
Delivery: via email in 1 business day
Determination of Estimating the Average Grain Size of Metal 1 Scope 1.1 This standard specifies the representation and determination methods for average grain size of metallic structure, including comparison procedure, planimetric procedure and intercept procedure; these methods are applicable to single-phase structure, but they, with specific requirements, may also be applied to determine the average size of a particular type of grain in a multi-phase or multi-constituent specimen. These methods may also be applied to nonmetallic materials with structures having appearances similar to those of the metallic structures shown in the comparison charts. 1.2 This standard is applied to determine the average grain size of specimens with a unimodal distribution (similar to lognormal distribution) of grain areas, diameters or intercept lengths, and is not applicable to the grain size in bimodal distribution. Characterization of duplex grain size is described in GB/T 24177. Test methods for determining individual very coarse grains in a fine grained matrix are described in YB/T 4290. 1.3 This standard deals only with determination of planar grain size. Determination of spatial grain size, that is, measurement of the size of the three-dimensional grains, is beyond the scope of this standard. 1.4 This standard deals only with the recommended test methods and nothing in it should be construed as defining or establishing limits of acceptability or fitness of purpose of the materials tested. 2 Normative References The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document. GB/T 4335 Determination of Ferrite Grain Size for Cold Rolled Low Carbon Steel Sheets GB/T 13298 Inspection Methods of Microstructure for Metals GB/T 24177 Standard Test Methods for Characterizing Duplex Grain Sizes GB/T 30067 Standard Terminology Relating to Metallography YB/T 4290 Test Methods for Estimating the Largest Grain Observed in a Metallographic Section (ALA Grain Size) 3 Terms and Definitions For the purposes of this document, the terms and definitions defined in GB/T 30067 and the following apply. 3.1 grain boundary a very narrow region in a polycrystalline material corresponding to the transition from one crystallographic orientation to another, thus separating one adjacent grain from another 3.2 grain a whole area enclosed by grain boundary, that is, the area within the original grain boundary observed on two-dimensional plane or the volume enclosed by the original grain boundary planes on three-dimensional body. Twin-plane boundary is not considered for materials with twin-plane boundary 3.3 grain size a magnitude of grain size. Generally, length, area, volume or grain size number are used for representing the grain size estimated or determined with different methods, while the grain size represented by grain size number is unrelated to the measurement method and unit 3.4 micro-grain size number G the micro-grain size number G is defined as: N100=2G-1 (1) 3.5 macro-grain size number Gm the macro-grain size number Gm is defined as: (2) 3.6 grain boundary intersection count Pi determination of the number of times a test line cuts across, or is tangent to grain boundaries, which is called the intersection count for short 3.7 grain intercept count Ni determination of the number of times a test line cuts through individual grains on the plane tested, which is called the intercept count for short 3.8 intercept length l the distance between two grain boundary intersection points on a test line segment that crosses the grain 4 Symbols The symbols adopted in this standard and their descriptions are given in Table 1. Table 1 Symbols and Descriptions 5 Generalities and Application 5.1 This standard specifies the basic procedures for determination of average grain size, including comparison procedure, planimetric procedure and intercept procedure. 5.2 Comparison procedure:
Foreword II Introduction IV 1 Scope 2 Normative References 3 Terms and Definitions 4 Symbols 5 Generalities and Application 6 Sampling 7 Specimen Preparation 8 Determination Procedures 9 Specimens with Non-equiaxed Grain Shapes 10 Grain Size of Specimens Containing Two- or Multi-phase Structure 11 Report on Grain Size 12 Precision and Bias Annex A (Normative) Establishing and Outlining Method of Grain Size Annex B (Normative) Statistical Techniques - Calculation for Confidence Interval and Relative Error of Grain Size Determination Results Annex C (Informative) Measurement Foundation of Grain Size
Referred in GB/T 30574-2021:
*GB/T 4335-2013 Determination of Ferrite Grain Size for Cold Rolled Low Carbon Steel Sheets
*GB/T 13298-2015 Inspection methods of microstructure for metals
*GB/T 24177-2009 Standard test methods for characterizing duplex grain sizes
*GB/T 30067-2013 Standard Terminology Relating to Metallography
*YB/T 4290-2012 Test Methods for Estimating the Largest Grain Observed in a Metallographic Section (ALA Grain Size)
Code of China
Standard
GB/T 30574-2021  Safety of machinery—Implementation criteria for safeguarding (English Version)
Standard No.GB/T 30574-2021
Statusvalid
LanguageEnglish
File FormatPDF
Word Count16500 words
Price(USD)495.0
Implemented on2022-7-1
Deliveryvia email in 1 business day
Detail of GB/T 30574-2021
Standard No.
GB/T 30574-2021
English Name
Safety of machinery—Implementation criteria for safeguarding
Chinese Name
机械安全 安全防护的实施准则
Chinese Classification
J09
Professional Classification
GB
ICS Classification
Issued by
SAMR, SAC
Issued on
2021-12-31
Implemented on
2022-7-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
GB/T 30574-2014 Safety of Machinery - Implementation Criteria for Safeguarding
Language
English
File Format
PDF
Word Count
16500 words
Price(USD)
495.0
Keywords
GB/T 30574-2021, GB 30574-2021, GBT 30574-2021, GB/T30574-2021, GB/T 30574, GB/T30574, GB30574-2021, GB 30574, GB30574, GBT30574-2021, GBT 30574, GBT30574
Introduction of GB/T 30574-2021
Determination of Estimating the Average Grain Size of Metal 1 Scope 1.1 This standard specifies the representation and determination methods for average grain size of metallic structure, including comparison procedure, planimetric procedure and intercept procedure; these methods are applicable to single-phase structure, but they, with specific requirements, may also be applied to determine the average size of a particular type of grain in a multi-phase or multi-constituent specimen. These methods may also be applied to nonmetallic materials with structures having appearances similar to those of the metallic structures shown in the comparison charts. 1.2 This standard is applied to determine the average grain size of specimens with a unimodal distribution (similar to lognormal distribution) of grain areas, diameters or intercept lengths, and is not applicable to the grain size in bimodal distribution. Characterization of duplex grain size is described in GB/T 24177. Test methods for determining individual very coarse grains in a fine grained matrix are described in YB/T 4290. 1.3 This standard deals only with determination of planar grain size. Determination of spatial grain size, that is, measurement of the size of the three-dimensional grains, is beyond the scope of this standard. 1.4 This standard deals only with the recommended test methods and nothing in it should be construed as defining or establishing limits of acceptability or fitness of purpose of the materials tested. 2 Normative References The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document. GB/T 4335 Determination of Ferrite Grain Size for Cold Rolled Low Carbon Steel Sheets GB/T 13298 Inspection Methods of Microstructure for Metals GB/T 24177 Standard Test Methods for Characterizing Duplex Grain Sizes GB/T 30067 Standard Terminology Relating to Metallography YB/T 4290 Test Methods for Estimating the Largest Grain Observed in a Metallographic Section (ALA Grain Size) 3 Terms and Definitions For the purposes of this document, the terms and definitions defined in GB/T 30067 and the following apply. 3.1 grain boundary a very narrow region in a polycrystalline material corresponding to the transition from one crystallographic orientation to another, thus separating one adjacent grain from another 3.2 grain a whole area enclosed by grain boundary, that is, the area within the original grain boundary observed on two-dimensional plane or the volume enclosed by the original grain boundary planes on three-dimensional body. Twin-plane boundary is not considered for materials with twin-plane boundary 3.3 grain size a magnitude of grain size. Generally, length, area, volume or grain size number are used for representing the grain size estimated or determined with different methods, while the grain size represented by grain size number is unrelated to the measurement method and unit 3.4 micro-grain size number G the micro-grain size number G is defined as: N100=2G-1 (1) 3.5 macro-grain size number Gm the macro-grain size number Gm is defined as: (2) 3.6 grain boundary intersection count Pi determination of the number of times a test line cuts across, or is tangent to grain boundaries, which is called the intersection count for short 3.7 grain intercept count Ni determination of the number of times a test line cuts through individual grains on the plane tested, which is called the intercept count for short 3.8 intercept length l the distance between two grain boundary intersection points on a test line segment that crosses the grain 4 Symbols The symbols adopted in this standard and their descriptions are given in Table 1. Table 1 Symbols and Descriptions 5 Generalities and Application 5.1 This standard specifies the basic procedures for determination of average grain size, including comparison procedure, planimetric procedure and intercept procedure. 5.2 Comparison procedure:
Contents of GB/T 30574-2021
Foreword II Introduction IV 1 Scope 2 Normative References 3 Terms and Definitions 4 Symbols 5 Generalities and Application 6 Sampling 7 Specimen Preparation 8 Determination Procedures 9 Specimens with Non-equiaxed Grain Shapes 10 Grain Size of Specimens Containing Two- or Multi-phase Structure 11 Report on Grain Size 12 Precision and Bias Annex A (Normative) Establishing and Outlining Method of Grain Size Annex B (Normative) Statistical Techniques - Calculation for Confidence Interval and Relative Error of Grain Size Determination Results Annex C (Informative) Measurement Foundation of Grain Size
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Keywords:
GB/T 30574-2021, GB 30574-2021, GBT 30574-2021, GB/T30574-2021, GB/T 30574, GB/T30574, GB30574-2021, GB 30574, GB30574, GBT30574-2021, GBT 30574, GBT30574