GB/T 4172-2000Permanent magnetic material of rare earth cobalt (English PDF)

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

& 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

6 Technical requirements