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GB/T 700-2006 English PDF (GBT700-2006)

GB/T 700-2006 English PDF (GBT700-2006)

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GB/T 700-2006: Carbon structural steels

This Standard specifies the grade, dimension, shape, weight, permissible deviation, technical requirements, test methods, inspection rules, packing, marking, and quality certificate of carbon structural steel. This Standard is applicable to the structural hot rolled steel sheets, steel strips, sectional steels, and bar steels that are generally used for welding, riveting and bolting engineering in delivery state.
GB/T 700-2006
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.45
H 40
Replacing GB/T 700-1988
Carbon structural steels
(ISO 630.1995, Structural steels ?€?
Plates, wide flats, bars, sections and profiles, NEQ)
Issue date. November 1, 2006 Implementation date. February 1, 2007
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the People's Republic of China (SAC). Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Grade denotation and symbols ... 7
4 Dimension, shape, weight and permissible deviation ... 7
5 Technical requirements ... 8
6 Test methods ... 12
7 Inspection rules ... 13
8 Packing, marking and quality certificate ... 13
Annex A ... 14
Foreword
The consistent degree between this Standard and ISO 630.1995 ?€?Structural Steels?€? is not equivalent. The main differences are as follows.
- Grades of yield strength levels of 185N/mm2 and 355N/mm2 are not defined; - Grades Q195 and Q215 are specified to corresponding levels 195N/mm2 and 215N/mm2;
- The phosphorus contents of class A steels of Q235 and Q275 are decreased by 0.005%;
- The thickness of Q235 class B steel is divided into two levels according to the deoxidization method; and the carbon content is 0.20% for both levels;
- For Q235 class B steel of which the thickness is smaller than 25mm, it may be exempted from inspection, with the consent of the buyer, and if the supplier can ensure that the impact absorbed energy is qualified;
- The yield strength of Q275 steel of which the thickness is bigger than 80mm~100mm is increased by 10N/mm2;
- Cold bending test is added;
- Detailed group-batching rules are specified according to the situation of China. This Standard replaces GB/T 700-1988 ?€?Carbon Structural Steels?€?. Compared with GB/T 700-1988, the main changes are as follows.
- Semi-killed steel is deleted in ?€?deoxidization method?€?;
- Grades Q255 and Q275 in GB/T 700-1988 are deleted;
- Grade E275 in ISO 630.1995 is newly added, and is changed to new grade Q275; - The lower limits of carbon and manganese contents of each grade are deleted, and the upper limit of manganese content is increased;
- The limits of silicon content of rimmed steel and killed steel are deleted; - Silicon content is changed from 0.30% to 0.35% (except for Q195);
- The phosphorus and sulphur contents of grade Q195 are decreased from 0.045% and 0.050% to 0.035% and 0.040% respectively;
Carbon structural steels
1 Scope
This Standard specifies the grade, dimension, shape, weight, permissible deviation, technical requirements, test methods, inspection rules, packing, marking, and quality certificate of carbon structural steel.
This Standard is applicable to the structural hot rolled steel sheets, steel strips, sectional steels, and bar steels that are generally used for welding, riveting and bolting engineering in delivery state.
The chemical composition specified by this Standard is also applicable to steel ingots, continuous casting billets, steel billets and their products.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments (not including corrections) to, or revisions of, any of these publications do not apply. However parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 222-2006 Permissible tolerances for chemical composition of steel products GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyryl methane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.10 Methods for chemical analysis of iron, steel and alloy - The cupferron separation-chrome azurol S photometric method for the determination of aluminum content
GB/T 223.11 Methods for chemical analysis of iron, steel and alloy - The ammonium persulfate oxidation volumetric method for the determination of chromium content GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodimetric method for the determination of copper content GB/T 223.19 Methods for chemical analysis of iron, steel and alloy ?€? The neocuproine-chloroform extraction photometric method for the determination of copper content
GB/T 223.24 Methods for chemical analysis of iron, steel and alloy - The extraction separation-dimethylglyoxime spectrophotometric method for the determination of nickel content
GB/T 223.32 Methods for chemical analysis of iron, steel and alloy - The hypophosphite reduction-iodimetric method for the determination of arsenic content GB/T 223.37 Methods for chemical analysis of iron, steel and alloy - The indophenol blue photometric method for the determination of nitrogen content after distillation separation
GB/T 223.58 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 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 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content GB/T 223.63 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 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 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 223.71 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 Methods for chemical analysis of iron, steel and alloy?€?The alumina chromatographic separation-barium sulfate gravimetric method for the determination of sulphur content
GB/T 228 Metallic materials - Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892.1998)
GB/T 229 Metallic materials - Charpy notch impact test (GB/T 229-1994, eqv ISO 83.1976, eqv ISO 148.1983)
GB/T 232 Metallic materials - Bend test (GB/T 232-1999, eqv ISO 7438.1985) GB/T 247 General rule of acceptance, package, mark and certification for steel plates (sheets) and strips
GB/T 2101 General regulation of the checkout, package, mark and quality certificate of profiled bar
GB/T 2975 Steel and steel products ?€? Location and preparation of test pieces for mechanical testing (GB/T 2975-1998, eqv ISO 377.1997)
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition (GB/T 20066-2006, ISO 14284.1996, IDT) 3 Grade denotation and symbols
3.1 Denotation of the grade
The grade of steel is composed of the letter representing yield strength, value of yield strength, symbol of quality grade, and symbol of deoxidization method in sequence. For example. Q235AF.
3.2 Symbols
Q - First letter of Chinese phonetic spelling for the ?€?Qu?€? word of steel yield strength; A, B, C, D - are respectively quality grade;
F - First letter of Chinese phonetic spelling for the ?€?Fei?€? word of rimmed steel; Z - First letter of Chinese phonetic spelling for the ?€?Zhen?€? word of killed steel; TZ - First letters of Chinese spelling for the ?€?Tezhen?€? word of special killed steel. In the denotation of grade components, symbols ?€?Z?€? and ?€?TZ?€? can be omitted. 4 Dimension, shape, weight and permissible deviation
The dimension, shape, weight and permissible deviation of steel sheets, steel strips, sectional steels and bar steels shall meet the specification of the corresponding standards respectively.
5.4.1 The results of tensile and impact tests of the steel shall meet the specification of Table 2. The result of bending test shall meet the specification of Table 3. 5.4.2 The thickness (diameter) of the steel products made of Q195 and Q235 class B rimmed steels shall not be bigger than 25mm.
5.4.3 When carrying out tensile and cold bending tests, longitudinal samples shall be taken for sectional steels and bar steels, transverse samples shall be taken for steel sheets and steel strips. The elongation after fracture i...

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