stabilizerGBT 700-2006 碳素结构钢-EN

2021年1月21日发(作者：盘香)

ICS 77.140.45
H 40

National standard of the People's Republic of China
GB/T
700-2006


























































Replace
GB/T
700-1988





碳素结构钢

Carbon structural steels

(ISO 630:1995, Structural steels
–

Plates, wide flats, bars, sections and profiles, NEQ)















Issue date: Nov 1, 2006
































Implementation date: Feb 1, 2007

Issued
by:
General
Administration
of
Quality
Supervision,
Inspection
and
Quarantine
of
the
People’s Republic of Chi
na
Standardization Administration of the People's Republic of China (SAC)

Foreword

This standard is not equivalent to ISO 630:1995 Structural Steels in the respect of consistency. The
main differences between the two standards are as follows:
-

No
grades
are
specified
corresponding
to
the
yield
strength
levels
of
185N/mm
2

and
355N/mm
2
;
-

Grades Q195 and Q215 are specified corresponding to levels 195N/mm
2
and 215N/mm
2
;
-

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% in both levels;
-

Q235 class B steel of which the thickness is smaller than 25mm may not be subject to test
with the consent of the buyer if the supplier can ensure that the impact absorbed energy is up
to standard;
-

The
yield
strength
of
Q275
steel
of
which
the
thickness
is
bigger
than
80mm~100mm
is
increased by 10N/mm
2
;
-

Cold bending test is added;
-

Detailed batching rules are specified according to the situation of China.
This standard replaces GB/T 700-1988 Carbon Structural Steels and has the following changes in
comparison with GB/T 700-1988:
-

Semi-killed steel is cancelled in
“
deoxidization method
”
;
-

Grades Q255 and Q275 in GB/T 700-1988 are cancelled;
-

Grade E275 in ISO 630:1995 is newly added and changed to the new grade Q275;
-

The lower limits of carbon and manganese contents of each grade are cancelled, and the upper
limit of manganese content is increased;
-

The limit of silicon content of rimmed steel and killed steel is cancelled;
-

silicon content is changed from 0.30% to 0.35% (except for Q195);
-

The phosphorus and sulphur contents of grade Q195 are decreased respectively from 0.045%
and 0.050% to 0.035% and 0.040%;
-

The
regulation
for
the
elongation
after
fracture
of
the
thickness
(or
diameter)
level
of
not
bigger than 16mm is cancelled;
-

“
The upper limit of the tensile strength of wide strip steel (including sheared steel plate) is not
used as a term of delivery
”
and
“
Q235 class B steel of which the thickness is smaller than
25mm may not be subject to test with the consent of the buyer if the supplier can ensure that
the impact absorbed energy is up to standard
”
are added in the footnotes of Table 2;
-

The regulation for the nitrogen content in the steel is modified;
-

The
regulation
for
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
basis
of
batching
is
changed
from
“
the
same
furnace
and
kettle
number
”

to
“
the
same
furnace number
”
and the limitation for the furnace number of mixed batch is cancelled.
Annex A of this standard is normative.
This standard was proposed by China Iron and Steel Association.
This standard is under the jurisdiction of National Technical Committee for Steel Standardization.
This standard was drafted by China Metallurgical Information & Standardization Institute, Capital
Iron and Steel Company, Handan Iron & Steel Group and Benxi Iron & Steel Group Co., Ltd.

The
main
drafters
of
this
standard
are
Tang
Yifan,
Luan
Yan,
Wang
Liping,
Sun
Ping,
Zhang
Xianfeng and Dai Qiang.
This standard was first 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 grade, dimension, shape, weight and 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 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 Denotation of the grade 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 turn. For example: Q235AF.
3.2 Symbols
Q- First letter of Chinese phonetic spelling for th
e “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