2023-12-4 3.233.221.90
Code of China Chinese Classification Professional Classification ICS Classification Latest News Value-added Services

Position: Chinese Standard in English/GB/T 34474.1-2017
GB/T 34474.1-2017   Determination of banded structure of steel-Part 1:Micrographic method using standards diagrams (English Version)
Standard No.: GB/T 34474.1-2017 Status:valid remind me the status change

Email:

Language:English File Format:PDF
Word Count: 13500 words Price(USD):260.0 remind me the price change

Email:

Implemented on:2018-7-1 Delivery: via email in 1 business day
,,
Standard No.: GB/T 34474.1-2017
English Name: Determination of banded structure of steel-Part 1:Micrographic method using standards diagrams
Chinese Name: 钢中带状组织的评定 第1部分:标准评级图法
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: AQSIQ AND SAC
Issued on: 2017-10-14
Implemented on: 2018-7-1
Status: valid
Language: English
File Format: PDF
Word Count: 13500 words
Price(USD): 260.0
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. GB/T 34474 Determination of banded structure of steel consists of several parts as planned. This part is Part 1 of GB/T 34474. This part is developed in accordance with the rules given in GB/T 1.1-2009. This part was proposed by China Iron and Steel Association. This part is under the jurisdiction of the National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 183).  Introduction This part of GB/T 34474 mainly specifies the geometric distribution of the ferrite banding of hypoeutectoid steel, while does not strictly specify the composition of class II structure banding composition of class II structure banding. This part is used for determining the banded structure of hypoeutectoid steel such as ferrite and pearlite in the nearly equilibrium state, and also for determining the banded structure of ferrite and other non-equilibrium structure. Determination of banded structure of steel - Part 1: Micrographic method using standards diagrams 1 Scope This part of GB/T 34474 specifies the method for determining the banded structure of hypoeutectic steel (including ferrite banding and class II structure banding) using comparison method. This part is applicable to the determination of banded structure of plastically deformed hypoeutectoid steel, while not applicable to the determination of banded carbide of hypereutectoid steel. 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 13298 Inspection methods of microstructure for metals GB/T 30067 Standard terminology relating to metallography 3 Terms and definitions For the purposes of this document, the terms and definitions given in GS/T 30067 and the following apply. 3.1 banded structure alternating microstructure banding parallel to the processing direction finally formed through deformation elongation in microsegregation area during steel plasticity processing Note: herein it refers to ferrite and class II structure banding. 3.2 class II structure banding banding composed of single or multiple structures (except ferrite), including pearlite, bainite and other non-equilibrium structures Note: where determined, they participate in the rating as a structure class. 3.3 continuous banding banding of the same class appearing in a view field, wherein, grains are separated only by grain boundaries and no structure of other class appears 4 General and application 4.1 This part describes the segregation degree of banded structure based on structure morphology. 4.2 Segregation occurring upon steel solidification forms regular arrangement during subsequent deformation; solid-state phase change is affected by microsegregation, which may generate alternately arranged banded microstructure. Such method describes the difference of banded microstructure morphology with the elongation in the deformation direction. 4.3 The microsegregation area formed due to eliquation is the root cause of the distribution of banded structure. The microsegregation area elongates in the subsequent deformation process to form a layered structure parallel to deformation direction. Other factors may also affect the formation of banded structure, such as the heating temperature and final forging temperature in hot processing, and the deformation rate in cold or hot processing. Hardenability and cooling rate determine decomposition and microstructure formation during phase change, wherein, the cooling rate of final phase change has the largest effect on the display degree of banded structure. 4.4 Banded structure will affect the uniformity of mechanical properties in each direction. 4.5 The results obtained by test may be used for inspecting product based on technical agreement between the supplier and the purchaser, comparing different manufacturing processes or process changes, or providing data for structure-property-application research. 4.6 The sample may have different banded structure levels after being subjected to different heat treatments, so the inspection state of the sample shall be indicated. 4.7 For the purpose of this part, the observed view field is compared with the diagram for rating, wherein, the magnification factor of standard diagrams is100X and the standard view field diameter is 80mm. 4.8 The rating diagrams for series A to E are given in Annex A. The levels of each series of diagrams range from 0 to 5, and increase with the increase of quantity, view field penetration, continuity and width of ferrite banding accordingly. See 7.3 for specific boundaries. Note: where there are more non-equilibrium structures, the segregation of alloy elements is not fully reflected. It is recommended to control the content of non-equilibrium structure when using standard diagrams, generally, the bainite content is not greater than 30%. 5 Sampling 5.1 Generally, the sample shall be taken from the delivered products, of which the inspected area is about 200mm2 (20mm × 10mm). The method and quantity of sampling shall comply with the requirements of product standards or technical conditions. 5.2 If not specified in the product standards, the sampling method is as follows: a) for steel with diameter, side length or thickness less than 25mm, the inspected surface is the entire longitudinal section through the steel axis or at 1/4 of the width, see Figure 1; b) for steel with diameter or side length greater than 25mm but less than or equal to 40mm, the inspected surface is the entire longitudinal section from the center to edge, see Figure 2; c) for steel with diameter or side length greater than 40mm, the inspected surface is the longitudinal sample in the middle part from the outer surface to center, see Figure 3; d) for flat steel with a thickness of less than or equal to 25mm, the inspected surface is the through-thickness section at 1/4 of the width, see Figure 4; e) for flat steel with a thickness greater than 25mm but less than or equal to 50mm, the inspected surface is the longitudinal section at 1/4 of the width and 1/2 of the thickness from the center to surface, see Figure 5; f) for flat steel with a thickness greater than 50mm, the inspected surface is the longitudinal section at 1/4 of the width and 1/4 of the thickness from the center to surface, see Figure 6; g) for flat steel with a thickness greater than 80mm, the inspected surface is the longitudinal section at 1/4 of the width and 20mm of the thickness from the center to surface.
Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 4 General and application 5 Sampling 6 Preparation of sample 7 Determination method 7.1 Observation method 7.2 Comparison method 7.3 Standard diagrams 8 Test report Annex A (Normative) Standard diagrams
Referred in GB/T 34474.1-2017:
*GB/T 13298-2015 Inspection methods of microstructure for metals
*GB/T 30067-2013 Standard Terminology Relating to Metallography
*GB/T 34440-2017 Rigid polyvinyl chloride flooring
*YY/T 1553-2017 Cardiovascular implants-Cardiac occluder
*SB/T 10419-2017 Non-dairy whipping cream
*TB/T 2344-2012/XG1-2017 Technical Specifications for the Procurement of 43 kg/m~75kg/m as Rolled Rails-2017, includes Amendment 1
*GB/T 156-2017 Standard voltages
*GB/T 3324-2017 General technical requirements for wooden furniture
*GB/T 5237.4-2017 Wrought aluminium alloy extruded profiles for architecture - Part 4:Powder coating profiles
*GB/T 5237.1-2017 Wrought aluminium alloy extruded profiles for architecture - Part 1: Mill finish profiles
*GB/T 4094.2-2017 Electric vehicles-Symbols for controls,indicators and tell-tales
*GB/T 34883-2017 Ion nitriding
*GB/T 34866-2017 Vanadium flow battery-Safety requirements
GB/T 34474.1-2017 is referred in:
*GB/T 3078-2019 Quality structural steel cold drawn bars
*GB/T 11251-2020 Alloy structural steel plate and strip
*GB/T 4336-2016/XG1-2017 Carbon and low-alloy steel―Determination of multi-element contents―Spark discharge atomic emission spectrometric method (routine method), includes Amendment 1
*GB 20074-2017 External projections for motorcycles and mopeds
*GB/T 7251.3-2017 Low-voltage switchgear and controlgear assemblies-Part 3:Distribution boards intended to be operated by ordinary persons ( DBO)
*GB/T 34955-2017 Atmospheric radiation effects-Guidelines for single event effects testing for avionics systems
*GB/T 34891-2017 Rolling bearings-Parts made from high-carbon chromium bearing steels- Specifications for heat treatment
*GB/T 20840.6-2017 Instrument transformers-Part 6:Additional general requirements for low-power instrument transformers
*GB/T 12665-2017 Requirements of damp-heat testing of electrical machine for service in general environmental condition
*GB/T 342-2017 Dimension,shape,mass and tolerance of cold-drawn round square and hexagonal steel wires
*GB/T 6173-2000 Hexagon thin nuts (chamfered) with fin pitch thread
*GB/T 5786-2000 Hexagon head bolts with fine pitch thread - Full thread
*GB/T 810-1988 Small round nuts
*GB/T 3737.1-1983 Union--Assembly
*GB/T 29.1-1988 Hexagon bolts with slot on head; Product grade A and B
*GB/T 3759-1983 Bite type tube fittings; Nuts
*GB/T 3763-1983 Bite type tube fittings; Hexagon thin nuts
*GB/T 3764-1983 Ferrule
*GB/T 4388-2008 Types of open-end wrenches box wrenches and combination wrenches
Code of China
Standard
GB/T 34474.1-2017  Determination of banded structure of steel-Part 1:Micrographic method using standards diagrams (English Version)
Standard No.GB/T 34474.1-2017
Statusvalid
LanguageEnglish
File FormatPDF
Word Count13500 words
Price(USD)260.0
Implemented on2018-7-1
Deliveryvia email in 1 business day
Detail of GB/T 34474.1-2017
Standard No.
GB/T 34474.1-2017
English Name
Determination of banded structure of steel-Part 1:Micrographic method using standards diagrams
Chinese Name
钢中带状组织的评定 第1部分:标准评级图法
Chinese Classification
H24
Professional Classification
GB
ICS Classification
Issued by
AQSIQ AND SAC
Issued on
2017-10-14
Implemented on
2018-7-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
Language
English
File Format
PDF
Word Count
13500 words
Price(USD)
260.0
Keywords
GB/T 34474.1-2017, GB 34474.1-2017, GBT 34474.1-2017, GB/T34474.1-2017, GB/T 34474.1, GB/T34474.1, GB34474.1-2017, GB 34474.1, GB34474.1, GBT34474.1-2017, GBT 34474.1, GBT34474.1
Introduction of GB/T 34474.1-2017
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. GB/T 34474 Determination of banded structure of steel consists of several parts as planned. This part is Part 1 of GB/T 34474. This part is developed in accordance with the rules given in GB/T 1.1-2009. This part was proposed by China Iron and Steel Association. This part is under the jurisdiction of the National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 183).  Introduction This part of GB/T 34474 mainly specifies the geometric distribution of the ferrite banding of hypoeutectoid steel, while does not strictly specify the composition of class II structure banding composition of class II structure banding. This part is used for determining the banded structure of hypoeutectoid steel such as ferrite and pearlite in the nearly equilibrium state, and also for determining the banded structure of ferrite and other non-equilibrium structure. Determination of banded structure of steel - Part 1: Micrographic method using standards diagrams 1 Scope This part of GB/T 34474 specifies the method for determining the banded structure of hypoeutectic steel (including ferrite banding and class II structure banding) using comparison method. This part is applicable to the determination of banded structure of plastically deformed hypoeutectoid steel, while not applicable to the determination of banded carbide of hypereutectoid steel. 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 13298 Inspection methods of microstructure for metals GB/T 30067 Standard terminology relating to metallography 3 Terms and definitions For the purposes of this document, the terms and definitions given in GS/T 30067 and the following apply. 3.1 banded structure alternating microstructure banding parallel to the processing direction finally formed through deformation elongation in microsegregation area during steel plasticity processing Note: herein it refers to ferrite and class II structure banding. 3.2 class II structure banding banding composed of single or multiple structures (except ferrite), including pearlite, bainite and other non-equilibrium structures Note: where determined, they participate in the rating as a structure class. 3.3 continuous banding banding of the same class appearing in a view field, wherein, grains are separated only by grain boundaries and no structure of other class appears 4 General and application 4.1 This part describes the segregation degree of banded structure based on structure morphology. 4.2 Segregation occurring upon steel solidification forms regular arrangement during subsequent deformation; solid-state phase change is affected by microsegregation, which may generate alternately arranged banded microstructure. Such method describes the difference of banded microstructure morphology with the elongation in the deformation direction. 4.3 The microsegregation area formed due to eliquation is the root cause of the distribution of banded structure. The microsegregation area elongates in the subsequent deformation process to form a layered structure parallel to deformation direction. Other factors may also affect the formation of banded structure, such as the heating temperature and final forging temperature in hot processing, and the deformation rate in cold or hot processing. Hardenability and cooling rate determine decomposition and microstructure formation during phase change, wherein, the cooling rate of final phase change has the largest effect on the display degree of banded structure. 4.4 Banded structure will affect the uniformity of mechanical properties in each direction. 4.5 The results obtained by test may be used for inspecting product based on technical agreement between the supplier and the purchaser, comparing different manufacturing processes or process changes, or providing data for structure-property-application research. 4.6 The sample may have different banded structure levels after being subjected to different heat treatments, so the inspection state of the sample shall be indicated. 4.7 For the purpose of this part, the observed view field is compared with the diagram for rating, wherein, the magnification factor of standard diagrams is100X and the standard view field diameter is 80mm. 4.8 The rating diagrams for series A to E are given in Annex A. The levels of each series of diagrams range from 0 to 5, and increase with the increase of quantity, view field penetration, continuity and width of ferrite banding accordingly. See 7.3 for specific boundaries. Note: where there are more non-equilibrium structures, the segregation of alloy elements is not fully reflected. It is recommended to control the content of non-equilibrium structure when using standard diagrams, generally, the bainite content is not greater than 30%. 5 Sampling 5.1 Generally, the sample shall be taken from the delivered products, of which the inspected area is about 200mm2 (20mm × 10mm). The method and quantity of sampling shall comply with the requirements of product standards or technical conditions. 5.2 If not specified in the product standards, the sampling method is as follows: a) for steel with diameter, side length or thickness less than 25mm, the inspected surface is the entire longitudinal section through the steel axis or at 1/4 of the width, see Figure 1; b) for steel with diameter or side length greater than 25mm but less than or equal to 40mm, the inspected surface is the entire longitudinal section from the center to edge, see Figure 2; c) for steel with diameter or side length greater than 40mm, the inspected surface is the longitudinal sample in the middle part from the outer surface to center, see Figure 3; d) for flat steel with a thickness of less than or equal to 25mm, the inspected surface is the through-thickness section at 1/4 of the width, see Figure 4; e) for flat steel with a thickness greater than 25mm but less than or equal to 50mm, the inspected surface is the longitudinal section at 1/4 of the width and 1/2 of the thickness from the center to surface, see Figure 5; f) for flat steel with a thickness greater than 50mm, the inspected surface is the longitudinal section at 1/4 of the width and 1/4 of the thickness from the center to surface, see Figure 6; g) for flat steel with a thickness greater than 80mm, the inspected surface is the longitudinal section at 1/4 of the width and 20mm of the thickness from the center to surface.
Contents of GB/T 34474.1-2017
Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 4 General and application 5 Sampling 6 Preparation of sample 7 Determination method 7.1 Observation method 7.2 Comparison method 7.3 Standard diagrams 8 Test report Annex A (Normative) Standard diagrams
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 34474.1-2017, GB 34474.1-2017, GBT 34474.1-2017, GB/T34474.1-2017, GB/T 34474.1, GB/T34474.1, GB34474.1-2017, GB 34474.1, GB34474.1, GBT34474.1-2017, GBT 34474.1, GBT34474.1