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GB/T 6728-2002 English PDF (GBT6728-2002)

GB/T 6728-2002 English PDF (GBT6728-2002)

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GB/T 6728-2002: Cold formed steel hollow sections for general structure -- Dimensions, shapes, weight and permissible deviations

This Standard specifies the range, classification, code, technical requirement, dimension, shape, weight, permissible deviation and marking of cold formed steel hollow sections for general structure.
GB/T 6728-2002
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.70
H 44
Replacing GB/T 6728-1986
Cold Formed Steel Hollow Sections for General
Structure - Dimensions, Shapes, Weight and
Permissible Deviations
ISSUED ON. JULY 15, 2002
IMPLEMENTED ON. DECEMBER 1, 2002
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Classification and Code ... 6
3 Sectional Dimension and Permissible Deviation ... 6
4 Length and Permissible Deviation ... 20
5 Shape... 21
6 Weight ... 22
7 Marking Example ... 22
Appendix A ... 23
Foreword
GB/T 6728-2002 "Cold Formed Steel Hollow Sections for General Structure - Dimensions, Shapes, Weight and Permissible Deviations" is a product-variety standard of cold formed steel hollow sections for general structure in cold formed section series standards; the relevant technical condition standard is GB/T 6725-2002 "Cold Formed Steel Sections".
Square- and rectangle-cold formed steel hollow sections specified in this Standard correspond to European standard EN 10219-2-1997 "Cold Formed Welded Structural Hollow Sections of Non-alloy and Fine Grain Steels - Part 2. Tolerances, Dimensions and Sectional Properties"; the specification for round cold formed steel hollow section corresponds to ISO 4019.1982 "Structural Steels - Cold-formed, Welded, Structural Hollow Sections - Dimensions and Sectional Properties". The consistency among this Standard, EN 10219-2-1997 and ISO 4019.1982 is not equivalent.
The main differences between this Standard and EN 10219-2-1997 "Cold Formed Welded Structural Hollow Sections of Non-alloy and Fine Grain Steels - Part 2. Tolerances, Dimensions and Sectional Properties" are as follows.
?€? For round cold formed steel hollow section, the specification of outside diameter 610 mm is added;
?€? For round cold formed steel hollow section, the permissible deviation of out-of-roundness is not specified;
?€? Class interval and specification of square- and rectangle-cold formed steel hollow section are added;
?€? The plane unevenness permissible deviation of square- and rectangle-cold formed steel hollow section is added;
?€? Bend angle permissible deviation of square- and rectangle-cold formed steel hollow section is decreased;
?€? Bending radius permissible deviation of square- and rectangle-cold formed steel hollow section is decreased;
?€? Class interval divisions of bend angle external arc semi-diameter R or (C1, C2) of square- and rectangle-cold formed steel hollow section are different;
?€? Type of special cold formed steel hollow section is added; specific shape and dimension are not specified;
?€? Permissible deviation of cold formed steel hollow section cut lengths is slightly adjusted;
?€? Weight permissible deflection of cold formed steel hollow section is added. The main differences between this Standard and ISO 4019.1982 "Structural Steels - Cold-formed, Welded, Structural Hollow Sections - Dimensions and Sectional Properties" are as follows.
?€? The outside diameter of round cold formed steel hollow section is slightly adjusted;
?€? For round cold formed steel hollow section, the specification of outside diameter 610 mm is added;
?€? For class interval and specification, square- and rectangle-cold formed steel hollow sections are added;
?€? Overall size permissible deviation is added;
?€? Minimum wall thickness permissible deviation of cold formed steel hollow section is added;
?€? Class interval division of bend angle external arc semi-diameter R or (C1, C2) of square- and rectangle-cold formed steel hollow section is different; the different requirement in carbon steel and low alloy steel are specified respectively; ?€? Angular permissible deviation of square- and rectangle-cold formed steel hollow section is added;
?€? Plane unevenness permissible deviation of square- and rectangle-cold formed steel hollow section is added;
?€? Type of special cold formed steel hollow section is added; specific shape and dimension are not specified;
?€? Specification of common fixing cutting permissible deviation of cold formed steel hollow section is added;
?€? Specification of weight permissible deviation of cold formed steel hollow section is added.
This Standard replaces GB/T 6728-1986 "Cold Formed Steel Hollow Sections for General Structure - Dimensions, Shapes, Weight and Permissible Deviations", from the implementation date.
Compared with GB/T 6728-1986, the main changes of this Standard are as follows. ?€? For round cold formed steel hollow section, the specification of outside diameter 21.3 mm ?€? 610 mm is added;
?€? Specification scope of square cold formed steel hollow section is expanded; side lengths 170mmx170mm - 500mmx500mm are added;
?€? Specification scope of rectangle cold formed steel hollow section is expanded; Cold Formed Steel Hollow Sections for General Structure -
Dimensions, Shapes, Weight and Permissible Deviations
1 Scope
This Standard specifies the range, classification, code, technical requirement, dimension, shape, weight, permissible deviation and marking of cold formed steel hollow sections for general structure.
This Standard is applicable to cold forming cold rolled or hot-rolled tandem rolling steel plate and steel strip, and cold-rolled forming section manufactured in continuous cold-roll-forming machine group.
For cold formed steel hollow section specified by this Standard, high frequency resistance welding is mainly adopted, and hydrogen arc welding or other welding methods may be adopted. This Standard is not applicable to cold-rolled forming section manufactured through drawing, stamping, folding and so on.
2 Classification and Code
According to shape, section steel is classified as round, square, rectangle and other special cold formed steel hollow sections. Codes are as following.
Round cold formed steel hollow section, abbreviated as round tube. Code. Y Square cold formed steel hollow section, abbreviated as square tube. Code. F Rectangle cold formed steel hollow section, abbreviated as rectangle tube. Code. J Special cold formed steel hollow section, abbreviated special tube. Code. YI 3 Sectional Dimension and Permissible Deviation
3.1 The sectional view of round cold formed steel hollow section is detailed in Figure 1; sectional dimension, cross sectional area, theoretical weight and cross section feature shall comply with specifications in Table 1.
3.2 The sectional view of square cold formed steel hollow section is detailed in Figure 2; sectional dimension, cross sectional area, theoretical weight and cross section feature shall comply with specifications in Table 2.
3.2 The sectional view of rectangle cold formed steel hollow section is detailed in Figure 3; sectional dimension, cross sectional area, theoretical weight and cross Table 1 Section Dimension, Permissible Deviation, Cross Sectional Area, Theoretical Weight and Cross Section Feature of Round Cold Formed Steel Hollow Section Outside
Diameter
D/
mm
Permissible
Deviation
mm
Wall
Thickness
mm
Theoretical
Weight
M/(kg/m)
Cross
Sectional
Area
A/cm2
Inertia
Moment
I/cm4
Radius of
Inertia
R/cm
Elastic
Modulus
Z/cm3
Plastic
modulus
S/cm3
Torsion constant
Surface
Area per
Unit
Length
As/m2 J/cm4 C/cm3
21.3
(21.3)
??0.5
1.2
1.5
1.75
2.0
2.5
3.0
0.59
0.73
0.84
0.95
1.16
1.35
0.76
0.93
1.07
1.21
1.48
1.72
0.38
0.46
0.52
0.57
0.66
0.74
0.712
0.702
0.694
0.686
0.671
0.655
0.36
0.43
0.49
0.54
0.62
0.70
0.49
0.59
0.67
0.75
0.89
1.01
0.77
0.92
1.04
1.14
1.33
1.48
0.72
0.86
0.97
1.07
1.25
1.39
0.067
0.067
0.067
0.067
0.067
0.067
26.8
(26.9)
??0.5
1.2
1.5
1.75
2.0
2.5
3.0
0.76
0.94
1.08
1.22
1.50
1.76
0.97
1.19
1.38
1.56
1.91
2.24
0.79
0.96
1.09
1.21
1.42
1.61
0.906
0.896
0.888
0.879
0.864
0.848
0.59
0.71
0.81
0.90
1.06
1.20
0.79
0.96
1.1
1.23
1.48
1.71
1.58
1.91
2.17
2.41
2.85
3.23
1.18
1.43
1.62
1.80
2.12
2.41
0.084
0.084
0.084
0.084
0.084
0.084
33.5
(33.7)
??0.5
1.5
2.0
2.5
3.0
3.5
4.0
1.18
1.55
1.91
2.26
2.59
2.91
1.51
1.98
2.43
2.87
3.29
3.71
1.93
2.46
2.94
3.37
3.76
4.11
1.132
1.116
1.099
1.084
1.068
1.053
1.15
1.47
1.76
2.01
2.24
2.45
1.54
1.99
2.41
2.80
3.16
3.50
3.87
4.93
5.89
6.75
7.52
8.21
2.31
2.94
3.51
4.03
4.49
4.90
0.105
0.105
0.105
0.105
0.105
0.105
42.3
(42.4)
??0.5
1.5
2.0
2.5
3.0
4.0
1.51
1.99
2.45
2.91
3.78
1.92
2.53
3.13
3.70
4.81
4.01
5.15
6.21
7.19
8.92
1.443
1.427
1.410
1.394
1.361
1.89
2.44
2.94
3.40
4.22
...

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