GB/T 700-2006 PDF English
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| GB/T 700-2006 | English | 105 |
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Carbon structural steels
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| GB/T 700-1988 | English | 70 |
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GB/T 700-2006: Carbon structural steels---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/GBT700-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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’s 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 Designation 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.
- Designations of yield strength levels of 185N/mm2 and 355N/mm2 are not defined;
- Designations 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”;
- Designations Q255 and Q275 in GB/T 700-1988 are deleted;
- Designation E275 in ISO 630.1995 is newly added, and is changed to new
designation Q275;
- The lower limits of carbon and manganese contents of each designation 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 designation Q195 are decreased from
0.045% and 0.050% to 0.035% and 0.040% respectively;
- The provision of elongation-after-fracture of which the thickness (or diameter) is not
bigger than 16mm is deleted;
- “The upper limit of the tensile strength of wide strip steel (including sheared steel plate)
is not used as delivery condition” and “Q235 class B steel of which the thickness is
smaller than 25mm may be exempted from inspection, with the consent of the buyer,
and if the supplier can ensure that the impact absorbed energy is qualified” are added
in the footnotes of Table 2;
- The provision of nitrogen content in the steel is modified;
- The provision of impact test is modified, and the figure of the minimum impact
absorbed energy of the samples of which the thickness is 5mm-10mm is added;
- The group-batching is changed from “the same furnace-kettle number” to “the same
furnace number”, and the limitation for the furnace number of mixed batch is deleted.
Annex A of this Standard is normative.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee for Steel
Standardization.
Drafting organizations of this Standard. China Metallurgical Information & Standardization
Institute, Capital Iron and Steel Company, and Handan Iron & Steel Group and Benxi Iron
& Steel Group Co., Ltd.
The main drafters of this Standard. Tang Yifan, Luan Yan, Wang Liping, Sun Ping, Zhang
Xianfeng, and Dai Qiang.
This Standard was first-time issued in January 1965; first revised in October 1979; and
revised for the second-time in June 1988.
Carbon structural steels
1 Scope
This Standard specifies the designation, 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 Designation denotation and symbols
3.1 Denotation of the designation
The designation 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 designation 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 Technical requirements
5.1 Designation and chemical composition
5.1.1 The designation and chemical composition (heat analysis) of the steel shall conform
to Table 1.
5.1.1.1 Class D steels shall have the element with sufficiently refined grains, of which the
content shall be indicated in the quality certificate. When aluminum deoxidization is used,
the content of acid soluble alumnium in the steel shall not be lower than 0.015%, or,
alternatively, the total aluminum content shall not be lower than 0.020%.
5.1.1.2 The contents of residual elements chromium, nickel and copper in the steel shall
not be higher than 0.30% respectively, the nitrogen content shall not be higher than
0.008%. The contents of these elements may be exempted from analysis if they can be
guaranteed by the supplier.
5.1.1.3 The arsenic content in the steel shall not be higher than 0.080%. For the steels
smelted with arsenic mineral smelting pig iron, the arsenic content shall be specified
through negotiation between both parties. If the raw material does not contain arsenic, the
analysis of arsenic may be exempted.
5.1.1.4 If it can be ensured that the mechanical properties of the steel meet the
specification of this Standard, then the carbon, manganese and silicon contents of the
Class A steel of each designation may be exempted from the terms of delivery. However,
their contents shall be indicated in the quality certificate.
5.1.1.5 When supplying commercial continuous casting billets, steel ingots and steel
billets, the lower limits of carbon and manganese contents of each designation can be
specified according to the requirements of the buyer, in order to ensure that the
performances of rolled steels meet the requirements of this Standard.
5.1.2 The permissible deviation of the chemical composition of steel product, continuous
casting billet and steel billet shall meet the specification of Table 1 of GB/T 222-2006.
The nitrogen content is permitted to exceed the specified value. However, it must meet the
requirement of clause 5.1.1.2.1.The maximum nitrogen content obtained through product
analysis shall not be higher than 0.014%. If the aluminum content in the steel reaches the
value specified in 5.1.1.2.1 and it is specified in the quality certificate, the upper limit of
nitrogen content may be without-limited.
The chemical composition deviation of the products and billets of rimmed steel is not
guaranteed.
5.2 Smelting method
The steel is smelted in oxygen converter or electric furnace. The smelting method is
generally selected by the supplier, unless the buyer has special requirements and they are
noted in the contract.
5.3 Delivery state
The steels are generally delivered in hot rolled, controlled rolled or normalized state.
5.4 Mechanical property
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 is allowed to be 2% lower (absolute
value) than the value specified in Table 2.If the transverse sampling of narrow steel strips
is limited by the width, then longitudinal samples can be taken.
5.4.4 Inspection may be exempted if the supplier can ensure that the cold bending test
meets the specification of Table 3.If Class A steel passes the cold bending test, the upper
limit of tensile strength may be exempted from term of delivery.
5.5 Surface quality
The surface quality of steel products shall respectively meet the specifications of the
relevant product standards for steel sheets, steel strips, sectional steels and bar steels.
6 Test methods
6.1 The inspection items, sampling number, sampling methods and test methods for each
batch of steel products shall meet the specifications of Table 4.
6.2 In tensile and cold bending tests, the longitudinal axis of the samples of steel sheets
and steel strips shall be perpendicular to the rolling direction, while the longitudinal axis of
the samples of sectional steels, bar steels and narrow steel strips limited by the width shall
be parallel to the rolling direction.
6.3 The longitudinal axis of the impact sample shall be parallel to the rolling direction. The
impact sample can reserve one rolled surface.
7 Inspection rules
7.1 The inspection and acceptance of the steel products shall be carried out by the
technical supervision department of the supplier. The buyer has the right to carry out
inspection and acceptance on any inspection item specified in this Standard or in the
contract.
7.2 The steel products shall be accepted in batches Each batch shall be comprised of the
steel products of the same-designation, same-furnace number, same-quality grade,
same-variety, same-dimension, and same-delivery state. The weight of each batch shall
not be greater than 60t.
For the steel products rolled with the steels smelted in the steel-making furnaces of which
the nominal capacity is small, the Class A or Class B steels of the same furnace number,
same designation, and manufactured by the same-smelting, pouring and deoxidization
methods, they are allowed to form a mixed batch. However, the carbon content difference
between the various furnace numbers of each batch shall not be bigger than 0.02%, the
manganese content difference shall not be bigger than 0.15%.
8 Packing, marking and quality certificate
The packing, marking and quality certificate of the steel product shall meet the
specifications of GB/T 247 and GB/T 2101.
Annex A
(Normative)
Impact absorbed energy of small-sized impact sample
Width of sample/mm
Figure A.1 Minimum impact absorbed energy of the samples of which the
width is 5mm-10mm
Impact absorbed energy of notched sample
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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