GB/T 8162-2018 English PDF (GBT8162-2018)

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GB/T 8162-2018: Seamless steel tubes for structural purposes
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75 H 48
GB/T 8162-2018
Replacing GB/T 8162-2008
Seamless Steel Tubes for Structural Purpose
Issued on. May 14, 2018 Implemented on. February 1, 2019 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Order Contents ... 8
4 Dimensions, Shape and Weight ... 8
5 Technical Requirements ... 11
6 Test Methods... 19
7 Inspection Rules ... 21
8 Packaging, Signs and Quality Certificates ... 21
Appendix A (Normative) Galvanized Coatings ... 22
Seamless Steel Tubes for Structural Purposes
1 Scope
This Standard specifies the order content, dimension, shape, weight, technical requirements, test methods, inspection rules, packaging and quality certification for seamless steel tube.
This standard applies to the seamless steel tubes for mechanical structural purposes and general engineering structural purposes.
2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and Total Silicon Content
- Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel and Alloy - Determination of Aluminium Content -Chrom Azurol S Photometric Method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content -Visual Titration or Potentiometric Titration Method
GB/T 223.12 Methods for Chemical Analysis of Iron, Steel and Alloy -The Sodium Carbonate Separation-Diphenyl Carbazide Photometric Method for the Determination of Chromium Content
GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the Determination of Vanadium 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 223.23 Iron, Steel and Alloy-Determination of Nickel Content -The Dimethylglyoxime GB/T 246 Metallic Materials - Tube - Flattening Test GB/T 699 Quality Carbon Structure Steels GB/T 2102 Acceptance Packing Marking and Quality Certification of Steel Pipe GB/T 2975 Steel and Steel Products - Location and Preparation of Samples and Test Pieces
for Mechanical Testing GB/T 3077 Alloy Structure Steels GB/T 4336 Carbon and Low-Alloy Steel -Determination of Multi-Element Contents - Spark
Discharge Atomic Emission Spectrometric Method (Routine Method) GB/T 5777-2008 Seamless Steel Pipe and Tubing Methods for Ultrasonic Testing GB/T 7735-2016 Automated Eddy Current Testing of Seamless and Welded (Except
Submerged Arc-Welded) Steel Tubes for Detection of Imperfections GB/T 12606-2016 Automated Full Peripheral Flux Leakage Testing of Seamless and Welded
(Except Submerged Arc-Welded) Ferromagnetic Steel Tubes for the Detection of Longitudinal and/or Transverse Imperfections GB/T 17395 Dimensions, Shapes, Masses and Tolerances of Seamless Steel Tubes GB/T 20066 Steel and Iron-Sampling and Preparation of Samples for the Determination of
Chemical Composition
GB/T 20123 Steel and Iron -Determination of Total Carbon and Sulfur Content Infrared Absorption Method After Combustion in An Induction Furnace (Routine Method) GB/T 20124 Steel and Iron -Determination of Nitrogen Content -Thermal Conductimetric
Method After Fusion in A Current of Inert Gas
GB/T 20125 Low-Alloy Steel -Determination of Multi-Element Contents -Inductively Coupled Plasma Atomic Emission Spectrometric Method YB/T 4149 Continuously Cast Round Billet for Seamless Steel Tube Rolling YB/T 5221 Alloy Structure Steel Round Tube Blank Hot Rolled and Forged for Making
Seamless Tube YB/T 5222 Quality Hot Rolled and Forged Carbon Structural Steel Round Tube Blank the requester specifies a certain smelting method, it shall be indicated in the contract.
5.2.2 Smelting Method for Tube Blank
5.2.2.1 Tube blanks can be manufactured by continuous casting, die casting or hot rolled (forging)
5.2.2.2 Continuous casting tube blanks shall comply with the provisions of YB/T 4149; hot rolled (forging) tube blanks shall comply with the provisions of YB/T 5221 or YB/T 5222; die casting tube blank can be carried out in accordance with the provisions of the hot rolled (forging) tube blank.
5.2.3 Manufacturing Method for Steel Tube
Steel tube shall be manufactured by a hot rolled (expanding) or cold drawn (rolled) seamless method. When the requester specifies a certain manufacturing method for steel tube, it shall be indicated in the contract.
5.3 Delivery Status
5.3.1 Hot rolled (expanding) steel tubes shall be delivered in hot-rolled (expanding) or heat treatment status. When the requester specifies the delivery status of heat treatment status, it shall be indicated in the contract.
5.3.2 Cold drawn (rolled) steel tubes shall be delivered by annealing or high-temperature tempering. According to the requirements of the requester, which shall be indicated in the contract, after the negotiation of both supply-demand parties, cold drawn (rolled) steel tube can also be delivered by cold drawn (rolled) or other heat treatment status.
5.4 Mechanical Properties
5.4.1 Tensile Properties
5.4.1.1 For steel tubes of high-quality carbon structural steel and low-alloy high-strength structural steel, tensile properties of their delivery status shall comply with the provisions in Table 7.
5.4.1.2 For sample blank of alloy structural steel tube, conduct heat treatment on it according to the heat treatment system recommended in Table 8; made it into the sample; measure its tensile properties. The tensile properties shall comply with the requirements in Table 8.
5.4.1.3 For mechanical properties of steel tubes which is delivered by cold drawn (rolled) status, it shall be determined by both supply-demand parties.
Table 7 -- Mechanical Properties for Steel Tubes of High-quality Carbon Structural Steel and Low-alloy High-strength Structural Steel
Designation Quality Tensile Lower Yield Strength ReL a/MPa Percentage Impact Test
10; 15; 20; 25 D×2/3
Q345; Q390; 20Mn; 25Mn D×7/8
a Minimum value for the distance between the flats of flattening test (H) shall be 5 times of steel tube's wall thickness.
5.5.2 Bending
According to the requirements of the requester, which shall be indicated in the contract, after the negotiation of both supply-demand parties, for the steel tube whose outside diameter is not more than 22mm, it can perform bending test. The bending angle shall be 90°, and bending core’s radius shall be 6 times of steel tube’s outside diameter. After bending, no cracks or chinks shall appear on the bending location.
5.6 Surface Quality
Inner and outer surfaces of steel tube shall not have visible cracks, folds, crusting, rolling and separation. These defects shall be completely cleaned out. Depth of cleaning place shall not exceed nominal wall thickness’s lower deviation. Actual wall thickness of the cleaning place shall not be less than the minimum allowed by the wall thickness. For other local imperfections which do not exceed wall thickness’s lower deviation, their existence is allowed.
5.7 Non-destructive testing
According to the requirements of the requester, which shall be indicated in the contract, after the negotiation of both supply-demand parties, for ...