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GB/T 33968-2017

Chinese Standard: 'GB/T 33968-2017'
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Detail Information of GB/T 33968-2017; GB/T33968-2017
Description (Translated English): Hot rolled steel sections with improved weldability
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H44
Classification of International Standard: 77.140.60
Word Count Estimation: 10,156
Date of Issue: 2017-07-12
Date of Implementation: 2018-04-01
Drafting Organization: Metallurgical Industry Information Standards Institute, Ma Gang (Group) Holdings Limited, Shandong Iron and Steel Co., Ltd. Laiwu Branch, China Metallurgical Building Research Institute Co., Ltd., Hebei Jinxi Iron and Steel Group Co., Ltd.
Administrative Organization: National Steel Standardization Technical Committee (SAC / TC 183)
Proposing organization: China Iron and Steel Industry Association
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee

GB/T 33968-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Hot Rolled Steel Sections
with Improved Weldability
改善焊接性能热轧型钢
ISSUED ON. JULY 12, 2017
IMPLEMENTED ON. APRIL 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Ordering Contents ... 7
4 Classification and Grade Expression Method ... 7
5 Dimension, Shape, Weight and Permissible Deviation ... 8
6 Technical Requirements ... 8
7 Test Methods ... 11
8 Inspection Rules ... 11
9 Package, Mark and Quality Certificate ... 12
Appendix A (Informative) Quenching and Self-Tempering Process (QST) ... 13
Bibliography ... 15
Hot Rolled Steel Sections
with Improved Weldability
1 Scope
This Standard specifies the ordering content, classification, grade expression method,
dimension, shape, weight and permissible deviation, technical requirements, test
methods, inspection rules, package, mark and quality certificate of hot rolled steel
sections with improved weldability.
This Standard is applicable to the hot rolled H-shaped steel sections (hereinafter
referred to as “H-shaped section steel”) with improved weldability produced by
quenching and self-tempering process (QST). Other hot rolled steel section can also
refer to this Standard.
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 document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination
of Phosphorus Content
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 Aluminum 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 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
Thiosulfate Separation Iodimetric Method for the Determination of Copper 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 223.32 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Hypophosphite Reduction-Iodimetric Method for the Determination of Arsenic
Content
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
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 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
Arsenite-Sodium Nitrite Titrimetric Method for the Determination of Manganese
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 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon
Content
GB/T 223.61 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Ammonium Phosphomolybdate Volumetric Method for the Determination of
Phosphorus Content
GB/T 223.62 Methods for Chemical Analysis of Iron, Steel and Alloy - The Butyl
Acetate Extraction Photometric Method for the Determination of Phosphorus
Content
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 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame
Atomic Absorption Spectrometric Method
GB/T 223.67 Iron, Steel and Alloy - Determination of Sulfur Content - Methylene
Blue Spectrophotometric Method
GB/T 223.68 Methods for Chemical Analysis of Iron Steel and Alloy - The
Combustion Potassium Iodate Volumetric Method for the Determination of Sulfur
Content
GB/T 223.69 Iron, Steel and Alloy-Determination of Carbon Contents- Gas-
volumetric Method after Combustion in the Pipe Furnace
GB/T 223.71 Methods for Chemical Analysis of Iron, Steel and Alloy the
Gravimetric Method after Combustion in the Pipe Furnace for the Determination
of Carbon Content
GB/T 223.72 Iron, Steel and Alloy - Determination of Sulfur Content - Gravimetric
Method
GB/T 223.74 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Combustion Gravimetric/Gas-Volumetric Method for the Determination of
Combined Carbon Content
GB/T 223.76 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrometric Method for the Determination of Vanadium
Content
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room
Temperature
GB/T 229 Metallic Materials - Charpy Notch Impact Test
GB/T 2101 General Provisions on Acceptance, Package, Marking and Quality
Certificate for Profile Steel
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for
Mechanical Testing
GB/T 5313 Steel Plate with Through-Thickness Characteristics
6.6.1 The H-shaped section steel with thickness no less than 6mm shall do the
impact test. The impact test specimen size shall be standard one of 10mm × 10mm ×
55mm. When it is insufficient to prepare the standard specimen, take small size
specimen; if the specimen size is 7.5mm × 10mm × 55mm, then the test result shall
be no less than 75% of the specified value; if the specimen size is 5mm × 10mm ×
55mm, then the test result shall be no less than 50% of the specified value. However,
the larger size specimen shall be preferred.
6.6.2 The Charpy (V-shaped) impact test results for H-shaped section steel shall be
based on the arithmetic average of a set of three specimens; thereof, one of the
specimen is allowed to be less than the specified value, but no less than 70% of the
specified value. If the test results don’t meet the above requirements, take another
three specimens form the same H-shaped section steel (or from the same billet); the
arithmetic average of the six specimens in two groups shall be no less than the
specified value; thereof, two specimens are allowed to be less than the specified value;
but only one of them less than 70% of specified value is allowed.
6.7 Surface quality
The surface quality of H-shaped section steel shall conform to the provisions of GB/T
11263. Through the negotiation between the supplier and the purchaser, indicated in
the contract, the provisions of YB/T 4427 or relevant standard shall be subject to.
Related standard:   GB/T 33958-2017  GB/T 33959-2017
   
 
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