GB/T 4172-2000 English PDF (GBT4172-2000)

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GB/T 4172-2000: Permanent magnetic material of rare earth cobalt
GB/T 4172-2000
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.20
H 40
Replacing GB/T 4172-1984
Atmospheric corrosion resisting steel
for welded structure
Replaced by GB/T 4171-2008
ISSUED ON: OCTOBER 25, 2000
IMPLEMENTED ON: SEPTEMBER 1, 2001
Issued by: State Bureau of Quality and Technical Supervision
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Definitions ... 7 
4 Classification and code ... 7 
5 Sizes, appearance and permissible deviations ... 8 
6 Technical requirements ... 8 
7 Test methods ... 11 
8 Inspection rules ... 11 
9 Packaging, marking and quality certificate ... 12 
Appendix A (Indicative) Comparison table of new and old designations ... 13 
Foreword
This Standard revises GB/T 4172-1984 Atmospheric corrosion resisting steel
for welded structure according to the development and application of
atmospheric corrosion resisting steel, with reference to relevant international
and domestic standards.
This revision of this Standard has revised the following main technical
contents:
— CHANGE the representation of the designation;
— ADJUST the chemical composition and properties of each designation;
— ADD some provisions and terms.
This Standard replaces GB/T 4172-1984 Atmospheric corrosion resisting
steel for welded structure from the date of implementation.
Appendix A of this Standard is an indicative appendix.
This Standard was proposed by the National Metallurgical Industry Bureau.
This Standard shall be under the jurisdiction of the National Technical
Committee for Standardization of Steel.
China Metallurgical Information and Standardization Institute and Wuhan Iron
and Steel (Group) Co., Ltd. were responsible for drafting this Standard.
Main drafters of this Standard: Tang Yifan, Huang Ying, Yao Ping, Luan Yan,
Deng Lianxian, and Liu Baoshi.
This Standard was first published in February 1984.
Atmospheric corrosion resisting steel
for welded structure
1 Scope
This Standard specifies the definitions, sizes, appearance, technical
requirements, test methods, acceptance rules, as well as packaging, marking,
quality certificate, etc. of the atmospheric corrosion resisting steel for welded
structure.
This Standard applies to the hot-rolled steel with atmospheric corrosion
resistance for bridges, buildings and other structural members, including steel
plates, steel strips and shaped steel, with a thickness of up to 100mm.
2 Normative references
The provisions contained in the following standards constitute provisions of
this Standard by reference in this Standard. At the time of publication, the
editions indicated were valid. All standards will be revised and parties using
this Standard shall explore the possibility of using the latest editions of the
following standards.
GB/T 222-1984 Method of sampling steel for determination of chemical
composition and permissible variations for product analysis
GB/T 223.3-1988 Methods for chemical analysis of iron, steel and alloy -
The diantipyrylmethane phosphomolybdate gravimetric method for the
determination of phosphorus content
GB/T 223.5-1997 Methods for chemical analysis of iron, steel and alloy -
The reduced molybdosilicate spectrophotometric method for the
determination of acid-soluble silicon content
GB/T 223.8-1991 Methods for chemical analysis of iron, steel and alloy -
The sodium fluoride separation - EDTA volumetric method for the
determination of aluminium content
GB/T 223.9-1989 Methods for chemical analysis of iron, steel and alloy -
The chromazurol S photometric method for the determination of aluminium
content
GB/T 223.53-1987 Methods for chemical analysis of iron, steel and alloy -
The flame atomic absorption spectrophotometric method for the
determination of copper content
GB/T 223.58-1987 Methods for chemical analysis of iron, steel and alloy -
The sodium arsenite-sodium nitrite titrimetric method for the determination
of manganese content
GB/T 223.59-1987 Methods for chemical analysis of iron, steel and alloy -
The reduced molybdoantimonyl phosphoric acid photometric method for
the determination of phosphorus content
GB/T 223.60-1997 Methods for chemical analysis of iron, steel and alloy -
The perchloric acid dehydration gravimetric method for the determination
of silicon content
GB/T 223.61-1988 Methods for chemical analysis of iron, steel and alloy -
The ammonium phosphomolybdate volumetric method for the
determination of phosphorus content
GB/T 223.62-1988 Methods for chemical analysis of iron, steel and alloy -
The butyl acetate extraction photometric method for the determination of
phosphorus content
GB/T 223.63-1988 Methods for chemical analysis of iron, steel and alloy -
The sodium (potassium) periodate photometric method for the
determination of manganese content
GB/T 223.64-1988 Methods for chemical analysis of iron, steel and alloy -
The flame atomic absorption spectrometric method for the determination of
manganese content
GB/T 223.68-1997 Methods for chemical analysis of iron, steel and alloy -
The potassium iodate titration method after combustion in the pipe furnace
for the determination of sulfur content
GB/T 223.69-1997 Methods for chemical analysis of iron, steel and alloy -
The gas-volumetric method after combustion in the pipe furnace for the
determination of carbon content
GB/T 223.71-1997 Methods for chemical analysis of iron, steel and alloy -
The gravimetric method after combustion in the pipe furnace for the
determination of carbon content
GB/T 223.72-1991 Methods for chemical analysis of iron, steel and alloy -
The alumina chromatographic separation - Barium sulfate gravimetric
method for the determination of sulphur content
figures of the yield point, with the quality grade code (C, D and E) appended
to the designation.
For example: Q355NHC, and Q460NHD
Q - The first letter of the Chinese phonetic alphabet of “yield” in the yield
point;
NH - The first letters of the Chinese phonetic alphabets of “atmospheric
corrosion” and “resisting”;
355, 460 - Figures of the yield point, in MPa.
5 Sizes, appearance and permissible deviations
5.1 The sizes, appearance and permissible variations of steel plates and
steel strips shall comply with the relevant provisions of GB/T 709.
5.2 The sizes, appearance and permissible variations of shaped steel shall
comply with the provisions of relevant standards.
6 Technical requirements
6.1 Designation and chemical composition
6.1.1 The designation and chemical composition of steel shall comply with
the provisions of Table 1.
6.1.2 The lower limit of silicon content of Q235NH and Q295NH may be
0.10%. The lower limit of manganese content of Q355NH may reach 0.60%.
6.1.3 In order to improve the properties of steel, each designation may be
added with one or more trace alloying elements: Ni≤0.65%, Nb:
0.015%~0.050%, V: 0.02%~0.15%, Ti: 0.02%~0.10%, Mo≤0.30%, Zr≤0.15%,
and Al≥0.020%.
6.1.4 The permissible variations of the chemical compositions of finished
steel and billet shall comply with the provisions of GB/T 222.