GB/T 3074.1-2021 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3074.1-2021 | English | 110 |
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The test method for flexural strength of carbon materials
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| GB/T 3074.1-2008 | English | 90 |
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Method for the determination of the flexure strength of graphite electrodes
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| GB/T 3074.1-1982 | English | 199 |
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Method for determination of the flexure strength of graphite electrodes
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GB/T 3074.1-2021: The test method for flexural strength of carbon materials---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/GBT3074.1-2021
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 29.050
CCS Q 50
Replacing GB/T 3074.1-2008
The test method for flexural strength of carbon materials
Issued on. AUGUST 20, 2021
Implemented on. MARCH 1, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Principle... 6
5 Instruments and equipment... 7
6 Specimens... 8
7 Test steps... 9
8 Result calculation... 9
9 Test report... 10
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 is Part 1 of GB/T 3074.GB/T 3074 has been published in the following
parts.
-- GB/T 3074.1 The test method for flexural strength of carbon materials;
-- GB/T 3074.2 Method for the determination of the elastic modulus of graphite
electrodes;
-- GB/T 3074.3 Method for the determination of the oxidation resistance of
graphite electrodes;
-- GB/T 3074.4 Method for the determination of the coefficient of thermal
expansion of graphite electrodes.
This document replaces GB/T 3074.1-2008 Method for the determination of the flexure
strength of graphite electrodes. Compared with GB/T 3074.1-2008, in addition to
structural adjustments and editorial modifications, the main technical changes of this
document are as follows.
-- The scope of application has been modified (see Chapter 1; see Chapter 1 of the
2008 edition);
-- The normative references have been modified (see Chapter 2; see Chapter 2 of
the 2008 edition);
-- The chapter "Terms and definitions" is added (see Chapter 3);
-- The principle of the four-point loading method is added (see 4.2; see Chapter 3
of the 2008 edition);
-- The instruments and equipment are modified (see 5.1, 5.2, 5.3, and 5.4; see
Chapter 4 of the 2008 edition);
-- The specimen dimensions and processing requirements are modified (see
Chapter 6; see Chapter 5 of the 2008 edition);
-- The test procedures are modified (see Chapter 7; see Chapter 6 of the 2008
edition);
-- The calculation formula for the flexural strength of parallelepiped specimens is
added (see 8.2);
-- The content of the test report has been modified (see Chapter 9; see Chapter 8 of
the 2008 edition).
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel
of Standardization Administration of China (SAC/TC183).
Drafting organizations of this document. Shanxi Juxian Graphite New Materials Co.,
Ltd., Sinosteel Group New Materials (Zhejiang) Co., Ltd., Shandong Basan Graphite
New Material Plant, Kaifeng Pingmei New Carbon Materials Technology Co., Ltd.,
Datong Yulinde Graphite New Material Co., Ltd., Chenzhou Product Quality
Supervision and Inspection Institute, Beijing Inspect Technology Co., Ltd., China
Metallurgical Information and Standardization Institute.
Main drafters of this document. Zhang Xiangjun, Wang Sizhai, Ma Wei, Yang Hui,
Zheng Jingxu, Tang Yonggui, Xu Jianping, Zhang Huibing, Wen Zhiwei, Zhao Xiufu,
Huang Zhen, Mao Yuzhen, Li Jianxin, Zhou Zhiyong, Wu Feng, Du Aifang, Wu Jianguo,
Chen Hong, Cao Hui.
The previous versions of this document and the documents it replaces are as follows.
-- First issued in 1982 as GB/T 3074.1-1982 and first revised in 2008;
-- This is the second revision.
1 Scope
This document specifies the principles, instruments, equipment, specimens, test
procedures, result calculations, and test reports for determining the flexural strength of
carbon materials.
This document is applicable to the determination of the flexural strength of carbon
materials by using the four-point loading method at room temperature.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 1427 Sample method of carbon material
GB/T 8170 Rules of rounding off for numerical values & expression and judgment
of limiting values
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
4.1 Flexural strength is a measure of the maximum load that a material can withstand
when it is bent and fractured by an external force. Its value is the magnitude of the
normal stress on the cross-section of the specimen when it is bent and fractured.
4.2 Four-point loading method. Place the specimen on two load-bearing blocks and
apply load at their center until the specimen breaks.
5 Instruments and equipment
5.1 Vernier caliper. The measuring range is 0 mm~200 mm, and the accuracy is 0.02
mm.
5.2 Micrometer. The measuring range is 0 mm~50 mm, and the accuracy is 0.01 mm.
5.5 Test fixture. The fixture shall ensure that the force applied to the specimen is normal
and has no eccentricity through the adjustment of the spherical bearing seat or roller
bearing assembly. The distance between the upper and lower indenters can be adjusted
to meet the needs of samples of different sizes. The fixture shall have a device to prevent
the specimen from sliding. The device is shown in Figure 1.
6 Specimens
6.1 Sampling and processing shall be in accordance with the provisions of GB/T 1427.
6.2 For products that are not specified in GB/T 1427, the specimen dimensions and
processing requirements are as follows.
6.3 All planes of the specimen are required to be flat, with parallelism better than 0.1
mm/100 mm and surface roughness better than Ra3.2 μm.
7 Test steps
7.1 The specimen shall be dried in an air blast drying oven at 110 ℃±5 ℃ for 2 hours
and stored in a desiccator to cool to room temperature for use.
7.2 Measure the dimensions of the specimen. For cylindrical specimens, measure the
diameter.
7.3 Place the specimen on the lower indenters of the testing machine, align the center
of the specimen with the center of the spacing between the upper indenters, and make
the axes of the upper and lower indenters perpendicular to the specimen axis. Adjust
the anti-slip device to prevent the specimen from sliding.
8 Result calculation
8.1 The flexural strength of the cylindrical specimen is calculated according to formula
(1).
9 Test report
The test report shall at least include the following contents.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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