GB/T 706-2026 Hot rolled section steel
1 Scope
This document specifies ordering information, dimensions, shape, mass and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certificates for hot rolled section steels (hot rolled I-beams, hot rolled taper flange channels, hot rolled parallel flange channels, hot rolled equal angle steels and hot rolled unequal angle steels).
This document is applicable to hot rolled section steels.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 232 Metallic materials - Bend test
GB/T 700 Carbon structural steels
GB/T 1591 High strength low alloy structural steels
GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4171 Atmospheric corrosion resisting structural steel
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
GB/T 41749 General requirements for surface condition of hot-rolled sections
TB/T 1979 Special metal materials for rolling stock - Atmospheric corrosion resisting steel
3 Terms and definitions
No terms and definitions are defined in this document.
4 Ordering contents
Contracts for products ordered in accordance with this document shall contain at least the following technical information:
a) product name;
b) code number of this document;
c) designation;
d) model and size;
e) delivery length;
f) mass and quantity;
g) special requirements.
5 Dimensions, shape, mass and tolerances
5.1 Dimensions and representation method
5.1.1 Sectional drawings and notation symbols of hot rolled section steels (hereinafter referred to as section steels) are shown in Figures 1 to 5.
5.1.2 Sectional dimensions, sectional area, theoretical mass and sectional property parameters of section steels shall meet the requirements of Tables A.1 to A.5 in Annex A respectively. Among them, fillet radius, external surface area, moment of inertia, radius of gyration, section modulus, centroid distance, first moment of area about X-axis and tan α of unequal angle steels are reference values.
5.2 Dimensions, shape and tolerances
5.2.1 Dimensions, shape and tolerances of section steels shall comply with Tables 1 to 3. Upon the purchaser’s request, the dimensions, shape and tolerances of section steels may also be specified by agreement between the supplier and the purchaser.
5.2.2 The outer edge radiusing at flange ends of I-beams, and the outer edge and shoulder radiusing at flange ends of channels shall not allow passage of a round bar with a diameter of 0.18 tf or 0.18 tf1; the outer corner and apex radiusing at leg ends of angle steels shall not allow passage of a round bar with a diameter of 0.18 t.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Ordering contents
5 Dimensions, shape, mass and tolerances
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking and quality certificate
Annex A (Normative) Sectional dimensions, sectional area, theoretical mass and sectional properties of section steel
GB/T 706-2026 Hot rolled section steel
1 Scope
This document specifies ordering information, dimensions, shape, mass and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certificates for hot rolled section steels (hot rolled I-beams, hot rolled taper flange channels, hot rolled parallel flange channels, hot rolled equal angle steels and hot rolled unequal angle steels).
This document is applicable to hot rolled section steels.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 232 Metallic materials - Bend test
GB/T 700 Carbon structural steels
GB/T 1591 High strength low alloy structural steels
GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4171 Atmospheric corrosion resisting structural steel
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
GB/T 41749 General requirements for surface condition of hot-rolled sections
TB/T 1979 Special metal materials for rolling stock - Atmospheric corrosion resisting steel
3 Terms and definitions
No terms and definitions are defined in this document.
4 Ordering contents
Contracts for products ordered in accordance with this document shall contain at least the following technical information:
a) product name;
b) code number of this document;
c) designation;
d) model and size;
e) delivery length;
f) mass and quantity;
g) special requirements.
5 Dimensions, shape, mass and tolerances
5.1 Dimensions and representation method
5.1.1 Sectional drawings and notation symbols of hot rolled section steels (hereinafter referred to as section steels) are shown in Figures 1 to 5.
5.1.2 Sectional dimensions, sectional area, theoretical mass and sectional property parameters of section steels shall meet the requirements of Tables A.1 to A.5 in Annex A respectively. Among them, fillet radius, external surface area, moment of inertia, radius of gyration, section modulus, centroid distance, first moment of area about X-axis and tan α of unequal angle steels are reference values.
5.2 Dimensions, shape and tolerances
5.2.1 Dimensions, shape and tolerances of section steels shall comply with Tables 1 to 3. Upon the purchaser’s request, the dimensions, shape and tolerances of section steels may also be specified by agreement between the supplier and the purchaser.
5.2.2 The outer edge radiusing at flange ends of I-beams, and the outer edge and shoulder radiusing at flange ends of channels shall not allow passage of a round bar with a diameter of 0.18 tf or 0.18 tf1; the outer corner and apex radiusing at leg ends of angle steels shall not allow passage of a round bar with a diameter of 0.18 t.
Contents of GB/T 706-2026
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Ordering contents
5 Dimensions, shape, mass and tolerances
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking and quality certificate
Annex A (Normative) Sectional dimensions, sectional area, theoretical mass and sectional properties of section steel
