GB/T 8162-2018 PDF in English
GB/T 8162-2018 (GB/T8162-2018, GBT 8162-2018, GBT8162-2018)
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| GB/T 8162-2018 | English | 205 |
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Seamless steel tubes for structural purposes
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| GB/T 8162-2008 | English | 70 |
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Seamless steel tubes for structural purposes
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| GB/T 8162-1999 | English | 319 |
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Seamless steel tubes for structural purposes
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| GB/T 8162-1987 | English | RFQ |
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Seamless Steel pipes for structural purposes
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Standards related to (historical): GB/T 8162-2018
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GB/T 8162-2018: PDF in English (GBT 8162-2018) 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 the steel tube, non-destructive testing can be performed by one or more of the following methods.
a) When performing ultrasonic testing according to the provisions of GB/T 5777-2008, compare the depth grade of sample tube’s groove. cold drawn (rolled) tube -L3; hot rolled (expanding) tube - L4;
b) Perform eddy current test according to GB/T 7735-2016. Acceptance level - E4H or E4;
c) Perform magnetic flux leakage detection according to the provisions of GB/T 12606-2016. Acceptance level - F4.
5.8 Galvanized Coatings
According to the requirements of the requester, which shall be indicated in the contract, after the negotiation of both supply-demand parties, steel tube can be delivered by galvanization. When the steel tube is delivered by galvanization, relevant requirements for galvanized coatings shall comply with the provisions in Appendix A.
6 Test Methods
6.1 Sampling for steel tube’s chemical composition analysis shall be carried out according to
7 Inspection Rules
7.1 Inspection and Acceptance
Inspection and acceptance of steel tubes shall be carried out by the supplier's quality and technical supervision department.
7.2 Rules of Lot Grouping
7.2.1 Steel tube shall be inspected and accepted in batch.
7.2.2 After being cut into single piece, if the steel tube is not performed with heat treatment anymore, for all tube sections which are taken from steel tubes rolled from the same tube blank, they shall be deemed as the same one.
7.2.3 For each batch, it shall be composed of the steel tube which has the same designation, same furnace number, same specification AND same heat treatment system (furnace No.). Quantity of each batch’s steel tubes shall not exceed the following provisions.
a) The one whose outside diameter is not more than 76mm AND the wall thickness is not more than 3mm. 400 pieces.
b) The one whose outside diameter is greater than 351mm. 50 pieces.
c) The ones with other dimensions. 200 pieces.
d) For the quantity of the remaining steel tubes, when it is not less than 50% of the above specified quantity, these steel tubes shall be separately listed as one batch; when the quantity is less than 50% of the above specified quantity, these steel tubes shall be merged into the adjacent batch of steel tube which has the same designation, same furnace number AND same specification.
7.3 Quantity of Samplings
For sampling quantity for all tests of each batch’s steel tube, it shall comply with the provisions of Table 11.
7.4 Re-examination and Judgment Rules
Re-inspection and judgment rules of steel tubes shall comply with the provisions of GB/T 2102.
8 Packaging, Signs and Quality Certificates
Packaging, signs and quality certificate of steel tubes shall comply with the provisions of GB/T 2102.
A.5.1 Preparation of Samples
After galvanization, steel tube’s galvanized coatings weight shall be measure. Take 2 steel pipes from each batch at random; take one 30mm~60mm (depending on specifications) tube section on each end of each steel tube; treat them as samples. Sample’s surface shall not have rough surface and zinc tumor. Sample’s surface shall be washed with pure solvent, such as benzene, petroleum benzene, trichloroethylene or carbon tetrachloride, etc. Then use ethanol to rinse it; use water to wash it out; coat the end faces of both ends of the sample with varnish (phenol); dry it adequately.
A.5.2 Preparation of Test Solution
Dissolve 32g of antimony trichloride (SbCl3) OR 20g of antimony trioxide (Sb2O3) in 1000mL of hydrochloric acid whose density is over 1.18kg/dm3 or more; prepare it as the stock solution. Before the test, add 5mL of the stock solution into 100mL of hydrochloric acid whose density is over 1.18kg/dm3 or more; treat it as the test solution.
A.5.3 Test Procedure
A.5.3.1 Use balance to weigh sample’s weight by AND round off it to the nearest one - 0.01g.
A.5.3.2 Immerse the sample into the test solution; immerse one sample at one time. Liquid level shall be higher than the sample. During the measurement, temperature of the solution shall not be higher than 38 °C.
A.5.3.3 In sample solution, when the generation of Hydrogen becomes less and the galvanized coatings has disappeared, take out the sample. Use water to rinse the sample; use cotton or clean cloth to dry it. After it is completely dried, it shall be weighed on the balance AND round off it to the nearest one - 0.01g.
A.5.3.4 After sample’s zinc coatings is peeled off, on two mutually perpendicular directions at the end of the sample, outside diameter and inner diameter shall be measured. Respectively take their average values; treat them as the actual outside diameter and inner diameter; round off it to the nearest one - 0.01mm.
A.5.3.5 In the case where the zinc coatings can be easily removed, test solution can be reusable.
A.5.4 Calculation of Test Results
A.5.4.1 Surface area of the sample shall be calculated according to formula (A.2).
e - Approximate value of galvanized coatings’ thickness. The unit is micrometers (μm);
mA - Weight of the galvanized coatings. The unit is grams per square meter (g/m2).
A.6 Uniformity of Galvanized Coatings
For galvanized steel tube, it shall perform galvanized coatings’ uniformity test. The test method shall comply with the provisions of A.7. During the test, the sample (except the weld seam) shall be continuously immersed for 5 times in copper sulfate solution without turning into red (color of copper plating).
A.7 Test Method for Uniformity Test of Galvanized Coatings (copper sulfate impregnation method)
A.7.1 Preparation of Samples
After the galvanization, the steel tube shall perform galvanized coatings’ uniformity test.
Take two steel tubes from each batch at random; take one tube section which is not less than 150mm on each end of each steel tube; treat them as samples. Oil contamination on sample’s surface shall be cleaned out firstly, then use clean soft cloth to wipe it off.
A.7.2 Preparation of Test Solution
Dissolve 33g of crystalline copper sulfate (CuSO4·5H2O) OR about 36g of industrial copper sulfate in 100mL of distilled water; then add excessive powdered copper hydroxide [Cu (OH)2] or alkaline copper carbonate (chemically pure) [ CuCO3-Cu (OH)2] to neutralize the free acid. If add copper hydroxide, it shall be about 10g in each 10L solution; if add alkaline copper carbonate; it shall be about 12g in each 10L solution. Judge that whether it is excessive or not according to the precipitation at the bottom of the container. At the same time, stir it adequately; then place it for 24h; filter it. If use powder copper oxide (CuO) to replace copper hydroxide, it shall be about 8g in each 10L solution, however, it shall be placed for 48h firstly and then shall be filtered. At 15 °C, density of the prepared test solution shall be 1.170 kg/dm3.
A.7.3 Test Container
A.7.3.1 For test containers, it shall choose the materials which is inert to copper sulphate.
A.7.3.2 For container’s internal dimensions, after the sample is immersed in the solution, it shall maintain the gap of at least 25mm from any wall of the container.
A.7.4 Test Procedure
A.7.4.1 Sample shall be downward based on the cut end. For the length which is immersed in the solution, it shall not be less than 100 mm. It shall be continuously immersed in copper sulfate solution for 5 times. During the test, sample’s and solution’s temperature shall maintain at 15°C~21°C, and they shall not be stirred. Impregnation time of the sample shall last for 1 min
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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