GB/T 32977-2016 PDF English
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| GB/T 32977-2016 | English | 90 |
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Hot Rolled Improved Corrosion Resisting Steel Sections
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GB/T 32977-2016: Hot Rolled Improved Corrosion Resisting Steel Sections---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT32977-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.70
H 40
Hot Rolled Improved Corrosion Resisting Steel Sections
Issued on: AUGUST 29, 2016
Implemented on: JULY 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Order Content ... 6
4 Designation System ... 6
5 Dimensions, Shape, Weight and Tolerances ... 6
6 Technical Requirements ... 7
7 Test Method ... 8
8 Inspection Rules ... 9
9 Packaging, Marking and Quality Certification ... 10
Annex A (Normative) Test Method of Corrosion Resistance for Steel
Sections ... 11
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of the National Standardization Technical
Committee on Steel (SAC/TC 183).
The drafting organizations. Guangxi Shenglong Metallurgical Co., Ltd., Gangyan
Shenghua Engineering & Research Co., Ltd., Central Research Institute of Building
and Construction Co., Ltd., Hebei Jinxi Iron & Steel Group Co., Ltd. and China
Metallurgical Information and Standardization Institute.
The main drafters of this Standard. Ke Xueli, Zhou Hemin, Wang Changcheng, Du
Xianwei, Wang Yujie, Wang Songlin, Zhao Yichen.
Hot Rolled Improved Corrosion Resisting Steel Sections
1 Scope
This Standard specifies the order content, designation system, dimensions, shape,
weight and tolerances, technical requirements, test method, inspection rules,
packaging, marking and quality certification of hot rolled improved corrosion resisting
steel sections (including I sections, channel steel, hot rolled equal-leg angle steel, hot
rolled unequal-leg angle steel and hot rolled H sections).
This Standard applies to hot rolled improved corrosion resisting steel sections
(hereinafter referred to as steel sections).
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced document (including any
amendments) applies 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 223.11 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 223.19 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 Spectrophotometric Method
GB/T 223.26 Iron, Steel and Alloy – Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
GB/T 223.40 Iron, Steel and Alloy – Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
GB/T 223.49 Methods for Chemical Analysis of Iron, Steel and Alloy Extraction
Separation-Chlorophosphonazo mA Spectrophotometric Method for the
Determination of the Total Rare Earth Content
GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrophotometric Method for the Determination of Copper
Content
GB/T 223.54 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrophotometric Method for the Determination of Nickel
Content
GB/T 223.59 Iron, Steel and Alloy – Determination of Phosphorus Content –
Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
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 223.68 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 223.69 Iron, Steel and Alloy – Determination of Carbon Content – Gas-
volumetric Method after Combustion in the Pipe Furnace
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 1266 Chemical Reagent – Sodium Chloride
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 Test Pieces
for Mechanical Testing
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission
Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method)
GB/T 11263 Hot-rolled H and Cut T Section Steel
elements may be added, such as Nb, V, Ti and Al.
6.1.3 In order to improve the corrosion resistance performance of steel sections, one
or more alloying elements may be added. Mo ≤ 0.3 0%, RE ≤ 0.0 5% and so on.
6.1.4 The content of the residual elements Cu in steel shall not be more than 0.30%.
6.1.5 The tolerances of the chemical compositions of finished steel sections shall
meet the specifications of GB/T 222.
6.2 Mechanical property and technological property
The mechanical property and technological property of steel sections shall meet the
specifications of corresponding strength grades of GB/T 700 and GB/T 1591.
6.3 Delivery state
Steel sections shall be delivered in the state of hot rolling or controlled rolling.
6.4 Surface finish
6.4.1 The surface of steel section shall be free from cracks, overlays, scars, layers
and inclusions.
6.4.2 The defects are allowed on the surface, such as local crazes, pits, indentations,
scratches and scale impressions, but they shall not exceed the tolerances of the
dimensions of steel sections.
6.4.3 It is allowed to remove the defects on the surface of steel sections. The defect
removal spots shall be smooth without corners. The width of removal shall not be less
than 5 times of the depth of removal. The dimensions of steel sections after removal
shall not exceed the tolerances of dimensions.
6.4.4 The ends of steel section shall be free from burrs more than 5 mm.
6.5 Corrosion resistance
The corrosion resistance of steel sections shall be compared with the designation
Q235 in GB/T 700 in accordance with the evaluation method in Annex A; the relative
corrosion rate shall be lower than 60%. The relative corrosion rate of steel sections is
calculated in accordance with Formula (1).
Relative corrosion rate = (average corrosion rate of corrosion resisting steel ÷ average
corrosion rate of Q235) × 100% ... (1)
7 Test Method
7.1 The test items, sampling quantity and test method for each batch of steel shall
A.3.3.2 Preparation of solution. Use 20 g of analytically pure sodium chloride
conforming to GB/T 1266 to dissolve in 980 mL of deionized water or distilled water of
conductivity not exceeding 20 μS·cm-1 under room temperature. The pH value of this
solution is within the range 6.5 to 7.5.
A.3.3.3 Replenisher. Deionized or distilled water.
A.3.3.4 The determination of chloride concentration. as required by GB/T 11896.
A.4 Test method
A.4.1 Clean the surface of the test pieces before the test; remove burrs and debris
from the holes; and wash them. During washing, first use gasoline or petroleum ether,
then use absolute ethyl alcohol, and then use acetone. Use hot air to dry them after
washing.
A.4.2 Measure and record the original weight (accurate to 1 mg), external
dimensions (accurate to 0.1 mm) and surface roughness and other aspects of the test
pieces.
A.4.3 The test pieces shall be suspended with non-woven materials; the height of
suspension shall be maintained consistent; and the position of the test pieces shall be
recorded. When suspended with a plastic insulated conductor, attention shall be paid
to prevent the metal wire core from contacting the solution or test pieces.
A.4.4 Pour a newly-prepared test solution into a tank to a prescribed scale. the total
quantity is (10.0 ± 0.5) L. Close the door of the chamber and start up the equipment.
Within half an hour, the temperature in the chamber achie...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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