2025-6-19 18.97.14.83
Code of China Chinese Classification Professional Classification ICS Classification Latest News Value-added Services

Position: Chinese Standard in English/GB/T 224-2019
GB/T 224-2019   Determination of the depth of decarburization of steels (English Version)
Standard No.: GB/T 224-2019 Status:valid remind me the status change

Email:

Language:English File Format:PDF
Word Count: 8500 words Price(USD):140.0 remind me the price change

Email:

Implemented on:2020-5-1 Delivery: via email in 1 business day
,,
Standard No.: GB/T 224-2019
English Name: Determination of the depth of decarburization of steels
Chinese Name: 钢的脱碳层深度测定法
Chinese Classification: H24    Metallographic testing method
Professional Classification: GB    National Standard
ICS Classification: 77.040.99 77.040.99    Other methods of testing of metals 77.040.99
Issued by: SAMR; SAC
Issued on: 2019-06-04
Implemented on: 2020-5-1
Status: valid
Superseding:GB/T 224-2008 Determination of depth of decarburization of steels
Language: English
File Format: PDF
Word Count: 8500 words
Price(USD): 140.0
Delivery: via email in 1 business day
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is drafted in accordance with the rules given in the GB/T 1.1-2009 This part replaces GB/T 224-2008 Determination of the Depth of Decarburization of Steels in whole. The following technical deviations have been made with respect to the GB/T 224-2008 (the previous edition): — deletion of the term “depth of ferritic decarburization” and its definition (Clause 3 of Edition 2008); — modification of the “Sampling” (see Clause 4; paragraph 3 of 4.1, 4.2.2, 4.4.1 and 4.4.2 of Edition 2008); — addition of the average method (see 5.2.3); — addition of the specific method for measuring the micro-indentation Knoop hardness and micro-hardness impressions (see 5.3.1); — addition of the electron probe microanalysis (see 5.4.4); — addition of the glow discharge optical emission spectrometry (see 5.4.5); — addition of the exact decimal places for different measurements of the depth of decarburization (see Clause 6). This standard has been redrafted and modified adoption of International Standard ISO 3887:2017 Steels — Determination of the Depth of Decarburization. Compared with ISO 3887:2017, this standard has the following technical differences and causes: — The adjustments of technical deviations are made for the normative references in this standard so as to adapt to the technical conditions of China. The adjustment is mainly reflected in Clause 2 "Normative References", with the specific adjustments as follows:  ISO 6507-1 is replaced by GB/T 4340.1 which is modified adoption of the International Standard (see 5.3.3);  ISO 4545-1 is replaced by GB/T 18449.1 which is modified adoption of the International Standard (see 5.3.3);  ISO 15349-2 is replaced by GB/T 20126 which is identical with the International Standard (see 5.4.2.2);  ISO 14707 is replaced by GB/T 19502 which is identical with the International Standard (see 5.4.5.1);  addition of references GB/T 30067 (see Clause 3), GB/T 13298 (see 5.2.2), GB/T 15247 (see 5.4.2.3), GB/T 4336 (see 5.4.3.2), GB/T 22368 (see 5.4.5.1); — addition of the requirements for sample state in Clause 4 "Sampling" (see 4.1), by reason of the sample state has a great influence on the depth of decarburization, so the requirements for sample state are unified to avoid quality disputes; — addition of requirements of "total test perimeter not less than 35 mm" for large samples and the sampling schematic diagram in Clause 4 "Sampling” (see 4.3 and Figures 2 to 4), which is included in GB/T 224-2008 to improve the operability of sampling; — addition of the “The depth of total decarburization of bearing steel, tool steel and spring steel shall be measured at the deepest position” (see 5.2.3.1), which had been specified in GB/T 224-2008 and applicable to the national conditions of China; — deletion of the 5.4.4 of ISO 3887:2017, its contents are included in 5.4.2.3 and 5.4.3.3, respectively; — modification of treatment method for the test results in 5.4.2 “Chemical analysis” and 5.4.3 “Spectrographic analysis” (see 5.4.2.3), keeping consistent with GB/T 224-2008, and applicable to the national conditions of China. For the purposes of this standard, the following editorial changes have also been made: — in order to be consistent with the existing standard series, the standard name is changed to Determination of the Depth of Decarburization of Steels. — addition of the metallographic structure of surface decarburization of GCr15 (see Figure A.3). This standard was proposed by China Iron and Steel Association. This standard is under the jurisdiction of SAC/TC 183 (National Technical Committee on Iron and Steel of Standardization Administration of China). The previous editions of the standard replaced by this standard are as follows: — GB 224-1963, GB 224-1978, GB/T 224-1987, GB/T 224-2008. Determination of the Depth of Decarburization of Steels 1 Scope This standard specifies the requirements for sampling, measuring methods and test reports of the decarburization of steel products. This standard is applicable to the determination of the depth of decarburization of steels (billets) and their parts. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 4336 Carbon and Low-alloy Steel — Determination of Multi-element Contents — Spark Discharge Atomic Emission Spectrometric Method (Routine Method) GB/T 4340.1 Metallic Materials — Vickers Hardness Test — Part 1: Test Method (GB/T 4340.1, ISO 6507-1:2005, MOD) GB/T 13298 Inspection Methods of Microstructure for Metals GB/T 15247 Microbeam Analysis — Electron Probe Microanalysis — Guidelines for Determining the Carbon Content of Steels Using Calibration Curve Method (GB/T 15247-2008, ISO 16592:2006, IDT) GB/T 18449.1 Metallic Materials — Vickers Hardness Test — Part 1: Test Method (GB/T -2009, ISO 4545-1:2005, MOD) GB/T 19502 Surface Chemical Analysis — Glow Discharge Optical Emission Spectrometry (GD-OSE) — Introduction to Use (GB/T 19502-2004, ISO 14707:2000, IDT) GB/T 20126 Unalloyed Steel — Determination of Low Carbon Content — Part 2: Infrared Absorption Method after Combustion in an Induction Furnace (with Preheating) (GB/T 20126-2006, ISO 15349-2:1999, IDT) GB/T 22368 Low-alloy Steel — Determination of Multi-element Contents — Glow Discharge Optical Emission Spectrometry (Routine Method) GB/T 30067 Standard Terminology Relating to Metallography ISO 9556 Steel and Iron — Determination of Total Carbon Content — Infrared Absorption Method after Combustion in an Induction Furnace ISO 14594 Microbeam Analysis — Electron Probe Microanalysis — Guidelines for the Determination of Experimental Parameters for Wavelength Dispersive Spectroscopy 3 Terms and Definitions For the purposes of this document, the terms and definitions given in GB/T 30067 and the following apply. 3.1 decarburization reduction of carbon content from the surface zone of the steel The reduction of carbon include: a) partial decarburization, measured as the distance from the point at which the carbon content exceeds the solubility limit in ferrite, becoming visible as e.g. pearlite, to the point at which there is no more visible difference to the core carbon concentration; b) complete decarburization, also called ferrite decarburization, measured as the distance between the surface of the product and the point up to which the carbon content is below the solubility limit of carbon in ferrite so that only ferrite is present. Note: The depth of complete decarburization as described in b) is determined by examination of the microstructure. 3.2 depth of functional decarburization distance between the surface of the product and the point at which the carbon content or hardness is at the level where the performance of the product would be unaffected by a reduction in carbon content (i.e. at the minimum level specified in the product standard) 3.3 depth of total decarburization distance between the surface of the product and the point at which the carbon content is that of the unaffected core, the sum of the partial and the complete decarburization The various bands of decarburization are shown diagrammatically in Figure 1. Note: If the product has undergone a process involving carburization, the definition of the “core” shall form the subject of an agreement between the parties concerned. The permissible depth of decarburization shall be specified in the appropriate standard covering the product or shall be the subject of an agreement between the parties concerned. Key: d1 — the depth of complete decarburization, in millimetres (mm); d2 — the depth of functional decarburization, in millimetres (mm); d3 — the depth of partial decarburization, in millimetres (mm); d4 — the depth of total decarburization, in millimetres (mm); a — the minimum carbon content specified in the product standard; b — core carbon content. Note: The boundaries separating the various types of decarburization are shown as hatched bands with the width of the band illustrating the practical variability in measurements due to the uncertainty of interpretation. Figure 1 Schematic representation for a typical decarburization 4 Sampling 4.1 Samples shall be inspected in the state of delivery without further heat treatment. If additional heat treatment is required as agreed by the parties concerned, attention should be paid to the prevention of changes in carbon distribution and mass fraction, such as the use of small samples, short austenitization time, neutral protective atmosphere, etc. 4.2 Samples should be taken at locations that are representative of the bulk specimen. The location and number of samples taken depend on the nature of the material to be tested and are defined by agreement between the parties concerned.
Foreword II 1 Scope 2 Normative References 3 Terms and Definitions 4 Sampling 5 Measuring Methods 6 Test Report Annex A (Informative) Examples of Typical Decarburization Microstructure Measured by Metallographic Method
Referred in GB/T 224-2019:
*GB/T 4336-2016/XG1-2017 Carbon and low-alloy steel―Determination of multi-element contents―Spark discharge atomic emission spectrometric method (routine method), including Amendment 1
*GB/T 4340.1-2009 Metallic materials—Vickers hardness test—Part 1:Test method
*GB/T 13298-2015 Inspection methods of microstructure for metals
*GB/T 15247-2008 Microbeam analysis - Electron probe microanalysis - Guidelines for determining the carbon content of steels using calibration curve method
*GB/T 18449.1-2009 Metallic materials—Knoop hardness test—Part 1:Test method
*GB/T 19502-2004 Surface chemical analysis - Glow discharge optical emission spectrometry (GD-OSE) - Introlduction to use
*GB/T 20126-2006 Unalloyed steel - Determination of low carbon content - Part 2: Infrared absorption method after combustion in an induction furnace (with preheating)
*GB/T 22368-2008 Low-alloy steel - Determination of multi-element contents - Glow discharge optical emission spectrometry(Routine method)
*GB/T 30067-2013 Standard Terminology Relating to Metallography
GB/T 224-2019 is referred in:
*GB/T 3078-2019 Quality structural steel cold drawn bars
*GB/T 5099.1-2017 Seamless steel gas cylinders―Part 1:Quenched and tempered steel cylinders with tensile strengthless than 1 100 MPa
*GB/T 5099.3-2017 Seamless steel gas cylinders―Part 3:Normalized cylinders
*GB/T 33954-2017 Hot-rolled wire rod for quenched and tempered spring steel wires
*GB/T 26075-2019 Steel bars for sucker rods
*YB/T 5058-2005 Cold-rolled spring and tool steel strips
*GB/T 12361-2016 Steel die forgings―General specification
*GB/T 1222-2007 Spring steels
*GB/T 4357-2022 Cold-drawn unalloyed steel wire for springs
*GB/T 18579-2019 High-carbon chromium bearing steel wires
*GB/T 41857-2022 Sheet metal parts fabricated by fine blanking combined with extrusion process—General specification
*GB/T 4357-2009 Cold-drawn non-alloy steel wire for springs
*JB/T 10416-2004 Automobile suspension springs specification
*GB/T 29532-2013 General specification for steel precision hot die forgings
*GB/T 32541-2016 Quality control system for heat treatment
*GB/T 12143-2008 General analytical methods for beverage
*GB/T 11251-2020 Alloy structural steel plate and strip
*GB/T 18983-2017 Wire for quenched and tempered springs
*GB/T 23934-2015 Hot formed helical compression springs—Technical requirement
*GB/T 18983-2003 Oil - Hardened and tempered stell wire for mechanical springs
*TB/T 3065-2020 Type II fastening system
*Q/BQB 517-2023 Wire rods for cold heading
*GB/T 19844-2018 Leaf springs—Technical specifications
Code of China
Standard
GB/T 224-2019  Determination of the depth of decarburization of steels (English Version)
Standard No.GB/T 224-2019
Statusvalid
LanguageEnglish
File FormatPDF
Word Count8500 words
Price(USD)140.0
Implemented on2020-5-1
Deliveryvia email in 1 business day
Detail of GB/T 224-2019
Standard No.
GB/T 224-2019
English Name
Determination of the depth of decarburization of steels
Chinese Name
钢的脱碳层深度测定法
Chinese Classification
H24
Professional Classification
GB
ICS Classification
Issued by
SAMR; SAC
Issued on
2019-06-04
Implemented on
2020-5-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
GB/T 224-2008 Determination of depth of decarburization of steels
Language
English
File Format
PDF
Word Count
8500 words
Price(USD)
140.0
Keywords
GB/T 224-2019, GB 224-2019, GBT 224-2019, GB/T224-2019, GB/T 224, GB/T224, GB224-2019, GB 224, GB224, GBT224-2019, GBT 224, GBT224
Introduction of GB/T 224-2019
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is drafted in accordance with the rules given in the GB/T 1.1-2009 This part replaces GB/T 224-2008 Determination of the Depth of Decarburization of Steels in whole. The following technical deviations have been made with respect to the GB/T 224-2008 (the previous edition): — deletion of the term “depth of ferritic decarburization” and its definition (Clause 3 of Edition 2008); — modification of the “Sampling” (see Clause 4; paragraph 3 of 4.1, 4.2.2, 4.4.1 and 4.4.2 of Edition 2008); — addition of the average method (see 5.2.3); — addition of the specific method for measuring the micro-indentation Knoop hardness and micro-hardness impressions (see 5.3.1); — addition of the electron probe microanalysis (see 5.4.4); — addition of the glow discharge optical emission spectrometry (see 5.4.5); — addition of the exact decimal places for different measurements of the depth of decarburization (see Clause 6). This standard has been redrafted and modified adoption of International Standard ISO 3887:2017 Steels — Determination of the Depth of Decarburization. Compared with ISO 3887:2017, this standard has the following technical differences and causes: — The adjustments of technical deviations are made for the normative references in this standard so as to adapt to the technical conditions of China. The adjustment is mainly reflected in Clause 2 "Normative References", with the specific adjustments as follows:  ISO 6507-1 is replaced by GB/T 4340.1 which is modified adoption of the International Standard (see 5.3.3);  ISO 4545-1 is replaced by GB/T 18449.1 which is modified adoption of the International Standard (see 5.3.3);  ISO 15349-2 is replaced by GB/T 20126 which is identical with the International Standard (see 5.4.2.2);  ISO 14707 is replaced by GB/T 19502 which is identical with the International Standard (see 5.4.5.1);  addition of references GB/T 30067 (see Clause 3), GB/T 13298 (see 5.2.2), GB/T 15247 (see 5.4.2.3), GB/T 4336 (see 5.4.3.2), GB/T 22368 (see 5.4.5.1); — addition of the requirements for sample state in Clause 4 "Sampling" (see 4.1), by reason of the sample state has a great influence on the depth of decarburization, so the requirements for sample state are unified to avoid quality disputes; — addition of requirements of "total test perimeter not less than 35 mm" for large samples and the sampling schematic diagram in Clause 4 "Sampling” (see 4.3 and Figures 2 to 4), which is included in GB/T 224-2008 to improve the operability of sampling; — addition of the “The depth of total decarburization of bearing steel, tool steel and spring steel shall be measured at the deepest position” (see 5.2.3.1), which had been specified in GB/T 224-2008 and applicable to the national conditions of China; — deletion of the 5.4.4 of ISO 3887:2017, its contents are included in 5.4.2.3 and 5.4.3.3, respectively; — modification of treatment method for the test results in 5.4.2 “Chemical analysis” and 5.4.3 “Spectrographic analysis” (see 5.4.2.3), keeping consistent with GB/T 224-2008, and applicable to the national conditions of China. For the purposes of this standard, the following editorial changes have also been made: — in order to be consistent with the existing standard series, the standard name is changed to Determination of the Depth of Decarburization of Steels. — addition of the metallographic structure of surface decarburization of GCr15 (see Figure A.3). This standard was proposed by China Iron and Steel Association. This standard is under the jurisdiction of SAC/TC 183 (National Technical Committee on Iron and Steel of Standardization Administration of China). The previous editions of the standard replaced by this standard are as follows: — GB 224-1963, GB 224-1978, GB/T 224-1987, GB/T 224-2008. Determination of the Depth of Decarburization of Steels 1 Scope This standard specifies the requirements for sampling, measuring methods and test reports of the decarburization of steel products. This standard is applicable to the determination of the depth of decarburization of steels (billets) and their parts. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 4336 Carbon and Low-alloy Steel — Determination of Multi-element Contents — Spark Discharge Atomic Emission Spectrometric Method (Routine Method) GB/T 4340.1 Metallic Materials — Vickers Hardness Test — Part 1: Test Method (GB/T 4340.1, ISO 6507-1:2005, MOD) GB/T 13298 Inspection Methods of Microstructure for Metals GB/T 15247 Microbeam Analysis — Electron Probe Microanalysis — Guidelines for Determining the Carbon Content of Steels Using Calibration Curve Method (GB/T 15247-2008, ISO 16592:2006, IDT) GB/T 18449.1 Metallic Materials — Vickers Hardness Test — Part 1: Test Method (GB/T -2009, ISO 4545-1:2005, MOD) GB/T 19502 Surface Chemical Analysis — Glow Discharge Optical Emission Spectrometry (GD-OSE) — Introduction to Use (GB/T 19502-2004, ISO 14707:2000, IDT) GB/T 20126 Unalloyed Steel — Determination of Low Carbon Content — Part 2: Infrared Absorption Method after Combustion in an Induction Furnace (with Preheating) (GB/T 20126-2006, ISO 15349-2:1999, IDT) GB/T 22368 Low-alloy Steel — Determination of Multi-element Contents — Glow Discharge Optical Emission Spectrometry (Routine Method) GB/T 30067 Standard Terminology Relating to Metallography ISO 9556 Steel and Iron — Determination of Total Carbon Content — Infrared Absorption Method after Combustion in an Induction Furnace ISO 14594 Microbeam Analysis — Electron Probe Microanalysis — Guidelines for the Determination of Experimental Parameters for Wavelength Dispersive Spectroscopy 3 Terms and Definitions For the purposes of this document, the terms and definitions given in GB/T 30067 and the following apply. 3.1 decarburization reduction of carbon content from the surface zone of the steel The reduction of carbon include: a) partial decarburization, measured as the distance from the point at which the carbon content exceeds the solubility limit in ferrite, becoming visible as e.g. pearlite, to the point at which there is no more visible difference to the core carbon concentration; b) complete decarburization, also called ferrite decarburization, measured as the distance between the surface of the product and the point up to which the carbon content is below the solubility limit of carbon in ferrite so that only ferrite is present. Note: The depth of complete decarburization as described in b) is determined by examination of the microstructure. 3.2 depth of functional decarburization distance between the surface of the product and the point at which the carbon content or hardness is at the level where the performance of the product would be unaffected by a reduction in carbon content (i.e. at the minimum level specified in the product standard) 3.3 depth of total decarburization distance between the surface of the product and the point at which the carbon content is that of the unaffected core, the sum of the partial and the complete decarburization The various bands of decarburization are shown diagrammatically in Figure 1. Note: If the product has undergone a process involving carburization, the definition of the “core” shall form the subject of an agreement between the parties concerned. The permissible depth of decarburization shall be specified in the appropriate standard covering the product or shall be the subject of an agreement between the parties concerned. Key: d1 — the depth of complete decarburization, in millimetres (mm); d2 — the depth of functional decarburization, in millimetres (mm); d3 — the depth of partial decarburization, in millimetres (mm); d4 — the depth of total decarburization, in millimetres (mm); a — the minimum carbon content specified in the product standard; b — core carbon content. Note: The boundaries separating the various types of decarburization are shown as hatched bands with the width of the band illustrating the practical variability in measurements due to the uncertainty of interpretation. Figure 1 Schematic representation for a typical decarburization 4 Sampling 4.1 Samples shall be inspected in the state of delivery without further heat treatment. If additional heat treatment is required as agreed by the parties concerned, attention should be paid to the prevention of changes in carbon distribution and mass fraction, such as the use of small samples, short austenitization time, neutral protective atmosphere, etc. 4.2 Samples should be taken at locations that are representative of the bulk specimen. The location and number of samples taken depend on the nature of the material to be tested and are defined by agreement between the parties concerned.
Contents of GB/T 224-2019
Foreword II 1 Scope 2 Normative References 3 Terms and Definitions 4 Sampling 5 Measuring Methods 6 Test Report Annex A (Informative) Examples of Typical Decarburization Microstructure Measured by Metallographic Method
About Us   |    Contact Us   |    Terms of Service   |    Privacy   |    Cancellation & Refund Policy   |    Payment
Tel: +86-10-8572 5655 | Fax: +86-10-8581 9515 | Email: coc@codeofchina.com | QQ: 672269886
Copyright: TransForyou Co., Ltd. 2008-2040
 
 
Keywords:
GB/T 224-2019, GB 224-2019, GBT 224-2019, GB/T224-2019, GB/T 224, GB/T224, GB224-2019, GB 224, GB224, GBT224-2019, GBT 224, GBT224