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GB/T 36707-2018 English PDF (GBT36707-2018)

GB/T 36707-2018 English PDF (GBT36707-2018)

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GB/T 36707-2018: Hot rolled carbon steel and stainless-steel clad bars for the reinforcement of concrete
This Standard specifies the classification, designation, ordering contents, dimension, shape, weight, permissible tolerance, technical requirements, test methods, inspection rules, package, marking and quality certificate of hot rolled carbon steel and stainless steel clad bars for the reinforcement of concrete. This Standard is applicable to the stainless-steel clad bars produced by hot rolling method using stainless steel as the coating and carbon steel (or low alloy steel) as substrate.
GB/T 36707-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Hot Rolled Carbon Steel and Stainless-Steel
Clad Bars for the Reinforcement of Concrete
ISSUED ON. SEPTEMBER 17, 2018
IMPLEMENTED ON. JUNE 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 7
4 Classification and Designation ... 7
5 Ordering Contents... 8
6 Dimension, Shape, Weight and Permissible Tolerance ... 8
7 Technical Requirements ... 9
8 Test Methods ... 12
9 Inspection Rules ... 15
10 Package, Marking and Quality Certificate ... 16
Hot Rolled Carbon Steel and Stainless-Steel
Clad Bars for the Reinforcement of Concrete
1 Scope
This Standard specifies the classification, designation, ordering contents, dimension, shape, weight, permissible tolerance, technical requirements, test methods, inspection rules, package, marking and quality certificate of hot rolled carbon steel and stainless- steel clad bars for the reinforcement of concrete.
This Standard is applicable to the stainless-steel clad bars (hereinafter referred to as “steel bar”) produced by hot rolling method using stainless steel as the coating and carbon steel (or low alloy steel) as substrate.
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 223.5 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 223.14 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 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 223.85 Steel, Iron and Steel - Determination of Sulfur Content - Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 223.86 Steel, Iron and Steel - Determination of Total Carbon Content - Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 1499.1 Steel for the Reinforcement of Concrete - Part 1. Hot Rolled Plain Bars
GB/T 1499.2 Steel for the Reinforcement of Concrete - Part 2. Hot Rolled Ribbed Bars
GB/T 2101 General Requirement of Acceptance Packaging Marking and
Certification for Section Steel
GB/T 4334-2008 Corrosion of Metals and Alloys - Test Methods for Intergranular Corrosion of Stainless Steels
GB/T 4336 Carbon and Low-Alloy Steel - Determination of Multi-Element Contents -Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 6462 Metallic and Oxide Coatings - Measurement of Coating Thickness- Microscopical Method
GB/T 11170 Stainless Steel – Determination of Multi-Element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 17359 Microbeam Analysis - Quantitative Analysis Using Energy Dispersive Spectrometry
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements 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 7.6 Corrosion resistance
Except for the ferrite-type coated steel bar, other coated steel bars can be carried out intergranular corrosion test by the delivery status as per the Method E specified in GB/T 4334-2008. When testing, the transverse sections of both ends of the steel bar shall be applied the protective layer (such as epoxy resin). The test results, except for the transverse sections, shall be that the steel bar surface is free from leakage points and intergranular corrosion cracks caused by the corrosion.
7.7 Steel bar connection
The steel bars shall be mechanically connected; the joints shall be made of the materials that are anti-corrosive and match the strength level of the steel bar. 7.8 Surface quality
7.8.1 The stainless-steel coating of the steel bar shall completely cover the substrate; except for the transverse sections on both sides of the steel bar, its exterior surface shall be free of visible uncovered positions.
7.8.2 The surface of the steel bar shall not have any defects that may affect the use performance.
7.9 Delivery status and type
7.9.1 Steel bar shall be delivered in hot-rolled pickling conditions.
7.9.2 The plain steel bar can be delivered in straight strip or coil condition. The ribbed steel bar is generally delivered in straight strip condition; the ribbed steel bar with diameter no greater than 16mm can also be delivered in coil condition.
8 Test Methods
8.1 Inspection items and methods
8.1.1 The inspection items, sampling methods and test methods of each batch of steel bars shall conform to the provisions of Table 5.
8.2.1 The samples for tensile, bending, reverse bending tests are not allowed to be turned.
8.2.2 When taking the reverse bending test, firstly bend the sample in the forward direction by 90°; then keep it warm at 100°C±10°C for no less than 30min; after the natural cooling, bend the sample in the reverse direction by 20°. Both the bending angles shall be measured on load. When the supplier can guarantee the reverse bending performance of the steel bar after artificial aging, the sample after forward bending can also directly bent reversely at the room temperature.
8.2.3 The cross-sectional area for calculating the strength of the steel bar shall take the nominal cross-sectional area specified in GB/T 1499.1 and GB/T 1499.2. 8.3 Shape and size measurement
8.3.1 The measurement of transverse rib height of the ribbed steel bar shall be carried out by measuring the average value of transverse rib center height on both sides of the same section; namely, measure the maximum outer diameter of the steel bar; then the inner diameter of such place is subtracted; half of the obtained result value shall be the rib height, which shall be accurate to 0.1mm.
8.3.2 Th measurement of transverse rib interval of the ribbed steel bar shall be carried out by measuring the average rib interval. Namely, measure the center distance from the first transverse rib to the eleventh transverse rib on the same side; such value is divided by 10; then the rib interval is obtained, which shall be accurate to 0.1mm. 8.4 Measurement of coating thickness
8.4.1 The coating thickness of ribbed steel bar shall be measured on the inner diameter positions of the steel bar.
8.4.2 The non-magnetic coating thickness shall be measured by the magnetic thickness gauge; it can also be measured as specified in 8.4.3.
8.4.3 The magnetic coating thickness can use measuring microscope or the like to measure on the cross-section surface of the steel bar.
8.5 Measurement of weight tolerance
The measurement of weight tolerance between the plain steel bar and ribbed steel bar shall be carried out as per the provisions of GB/T 1499.1 and GB/T 1499.2, respectively. 8.6 Rounding off of the numerical value
The rounding off and judgment of the numerical value for the test results shall conform to the provisions of YB/T 081.
The reinspection and judgment of steel bar shall conform to the provisions of GB/T 17505.
10 Package, Marking and Quality Certificate
10.1 The plain steel bar can be rolled on its surface with a surface mark such as a raised factory name.
10.2 The surface marking of the ribbed steel bar shall conform to the following provisions.
a) The surface of the ribbed steel bar shall be rolled with designation mark; then rolled sequentially the registered factory name (or trademark), and diameter millimeter numbers.
b) The steel bar designation is expressed by combination of English letters and Arabic numerals; for instance, SC4 and SC5 indicates HRB400SC and
HRB500SC, respectively. The diameter millimeter number is expressed by
Arabic numerals.
c) The mark shall be clear; the mark size shall be specified by the supplier according to the diameter of the steel bar; the transverse rib intersecting the mark may be cancelled.
10.3 The ends of the steel bar shall be treated for rust prevention.
10.4 The package, marking and quality certificate of the steel bar shall conform to the relevant provisions of GB/T 2101.
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