GB/T 226-2015 PDF English
US$85.00 · In stock · Download in 9 secondsGB/T 226-2015: Test Method for Macrostructure and Defect of Steel by Etching Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 226: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 226-2015 | English | 85 |
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Test Method for Macrostructure and Defect of Steel by Etching
| Valid |
| GB/T 226-1991 | English | 199 |
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3 days
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Etch test for macrostructure and defect of steels
| Obsolete |
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GB/T 226-2015: Test Method for Macrostructure and Defect of Steel by Etching---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/GBT226-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.99
H 24
Replacing GB/T 226-1991
Test Method for Macrostructure
and Defect of Steel by Etching
Issued on. SEPTEMBER 11, 2015
Implemented on. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Forward... 3
1 Scope... 4
2 Normative References... 4
3 Specimen... 4
4 Test Method... 6
5 Test Results... 10
6 Specimen Retention... 11
7 Lab Environment Safety... 11
8 Test Report... 11
Forward
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaces GB/T 226-1991 Test Method for Macrostructure and Defect of
Steel by Etching.
Compared with GB/T 226-1991, this Standard mainly has the following changes.
--- Modifying the provision of specimen cutting method;
--- Modifying the provision of reference dimension from specimen test surface to
the cutting surface;
--- Increasing the requirement of specimen test surface roughness after machining;
--- Increasing the dendrite corrosion and cold acid etching method;
--- Modifying and increasing the ingredients, etching time and temperature of
partial hot and cold acid etching methods;
--- Increasing the DC electrolytic corrosion method;
--- Increasing the expressing method of test results;
--- Removing the evaluation provision of test results;
--- Increasing the provision on lab environment safety.
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel (SAC/TC 183).
Drafting organizations of this Standard. Angang Steel Company Limited, Baosteel
Special Metals Co., Ltd., China Metallurgical Information and Standardization Institute,
Shougang Corporation, Daye Special Steel Co., Ltd., Fushun Special Steel Co., Ltd.,
Xingtai Iron and Steel Co., Ltd., and Central Iron and Steel Research Institute.
Chief drafting staffs of this Standard. Syu Xiaohong, Guo Xiuli, Luan Yan, Ju Xinhua,
Cheng Lijie, Zhang Pengyuan, Wang Xiaofeng, Huang Lei, and Dai Wenke.
The previous versions that are replaced by this Standard are as follows.
--- GB/T 226-1997 and GB/T 226-1991.
Test Method for Macrostructure
and Defect of Steel by Etching
1 Scope
This Standard specifies the hot acid etching method, cold acid etching method
(including dendrite corrosion method), and.electrolytic etching method, which test the
macrostructure and defect of steel.
This Standard is applicable to the acid etching test of the macrostructure and defect of
steel. Other material’s acid etching test can be implemented as per this Standard.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this standard.
GB 8978-1996 Integrated Wastewater Discharge Standard
3 Specimen
3.1 Specimen cutting
3.2 Specimen machining
3.2.1 Specimen can be cut through hot saw, cold saw, flame cutting, shearing and
other methods. The deformation or heat affected zone caused by sampling shall be
removed during the specimen machining process.
3.2.2 The reference dimension from the test surface to the cutting surface of
specimen.
3.2.3 After machining, the specimen’s test surface roughness Ra shall meet the
following requirements.
3.3 Specimen dimension
3.3.1 Specimen thickness is generally about 20mm~30mm.
3.3.2 Length of longitudinal specimen is generally about 1.5 times of edge or
diameter.
4 Test Method
4.1 Overview
4.1.1 In the following methods, the parameters shall be selected on the premise of
guaranteeing to display the macrostructure and defect of steel. The proportion of all
kinds of strong acids is as follows.
4.1.2 During the arbitration inspecting process, if the technical conditions have no
special provisions, then the hot acid etching method is recommended to be subject to.
4.2 Hot acid etching method
4.2.1 Corresponding acid liquid shall be selected as per the different steel types.
4.3 Cold acid etching method
4.3.4 If over corrosion occurs, re-process the test surface of the specimen, remove
1mm-above depth and then re-etch.
4.4 Electrolytic etching method
4.4.1 AC electrolytic etching method
4.4.2.2 DC is used under room temperature to conduct electrolytic etching, when
specimen area is less than 130cm2, the acid solution shall be prepared by 100mL of
water added with 6mL~12mL of hydrochloric acid; when specimen area is more than
130cm2, the acid solution shall be prepared by 100mL of water added with 6mL of
hydrochloric acid and 1g of boric acid.
5 Test Results
5.1 The macrostructure and defect shape of steel displayed by hot acid etching
method, routine cold acid etching method, and electrolytic etching method can be
obtained through photo-optical or digital imaging method.
6 Specimen Retention
In order to keep the specimen for certain period, the following methods are
recommended to use.
7 Lab Environment Safety
Residual waste acid after etching operation shall be treated as per the discharge
provision of second pollutant specified in Clause 4.2.1.2 of GB 8978-1996.
8 Test Report
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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