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GB/T 37622-2019 English PDF (GBT37622-2019)

GB/T 37622-2019 English PDF (GBT37622-2019)

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GB/T 37622-2019: Hot rolled steel bar of fire resistant for the reinforcement of concrete
This Standard specifies the classification, designation, ordering content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, package, marking and quality certificate, etc. of hot rolled steel bar of fire resistant for the reinforcement of concrete. This Standard is applicable to the hot rolled plain bars of fire-resistant and hot rolled ribbed bars of fire-resistant.
GB/T 37622-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Hot Rolled Steel Bar of Fire
Resistant for the Reinforcement of Concrete
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: MAY 01, 2020
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 ... 6
4 Classification and Designation ... 6
5 Ordering Content ... 7
6 Size, Shape, Weight and Allowable Deviation ... 7
7 Technical Requirements ... 7
8 Test Methods ... 10
9 Inspection Rules ... 13
10 Package, Marking and Quality Certificate ... 14
Appendix A (Normative) Characteristic-Value Inspection Rules ... 15
Bibliography ... 17
Hot Rolled Steel Bar of Fire
Resistant for the Reinforcement of Concrete
1 Scope
This Standard specifies the classification, designation, ordering content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, package, marking and quality certificate, etc. of hot rolled steel bar of fire resistant for the reinforcement of concrete.
This Standard is applicable to the hot rolled plain bars of fire-resistant and hot rolled ribbed bars of fire-resistant (hereinafter referred to as steel bar).
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 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 223.37 Methods for Chemical Analysis of Iron, Steel and Alloy - the Indophenol Blue Photometric Method for the Determination of Nitrogen Content after Distillation Separation
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method
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 223.85 Iron, Steel and Alloy - Determination of Sulfur Content - Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 223.86 Iron, Steel and Alloy - Determination of Total Carbon Content - Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 228.2 Metallic Materials - Tensile Testing - Part 2: Method of Test at Elevated Temperature
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 4336 Carbon and Low-Alloy Steel - Determination of Multi-Element Contents -Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
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
5 Ordering Content
The contract that orders products as per this Standard shall contain the following contents:
a) This Standard number;
b) Product name;
c) Designation of steel bar;
d) Nominal diameter, length and weight of steel bar (or quantity, or disc weight); e) Special requirements.
6 Size, Shape, Weight and Allowable Deviation
The size, shape, weight and allowable deviation of plain bars shall conform to the provisions of GB/T 1499.1; while the size, shape, weight and allowable deviation of ribbed bars shall conform to the provisions of GB/T 1499.2.
7 Technical Requirements
7.1 Smelting method
The steel shall be smelted in a converter or an electric arc furnace; and may be refining outside the furnace, if necessary.
7.2 Designation chemical composition
7.2.1 The designation, chemical composition and carbon equivalent (smelting analysis) of steel bars shall conform to the provisions of Table 2.
Table 2
Designation
Chemical composition (mass fraction) / %
Carbon equivalent
Ceq / %
Welding Mechanical connection
The rounding off and judgment for values of inspection results shall conform to the provisions of YB/T 081.
9 Inspection Rules
9.1 Inspection classification
The inspection of steel bar can be divided into characteristic-value inspection and delivery inspection.
9.2 Characteristic-value inspection
9.2.1 The Characteristic-value inspection is applicable to the following cases: a) Supplier’s inspection on the product quality control;
b) Inspection proposed by purchaser, and agreed between the supplier and the purchaser;
c) Inspection for the third-party product certification and arbitration. 9.2.2 The characteristic-value inspection shall be carried out as per the provisions of Appendix A.
9.3 Delivery inspection
9.3.1 Applicable cases
The delivery inspection is applicable to the inspection on the acceptance batch of steel bars.
9.3.2 Batching rules
The steel bars shall be inspected and accepted in batches. Each batch consists of the steel bars with the same designation, the same furnace-number, the same specification. The weight per batch is usually no greater than 60t. For the portion exceeding 60t, add a tensile test specimen and a bending test specimen for increasing per 40t (or remainder for less than 40t).
9.3.3 Inspection items and sampling quantity
The inspection items and sampling quantity of steel bars shall conform to the provisions of Table 6 and 9.3.2.
9.3.4 Inspection results
Appendix A
(Normative)
Characteristic-Value Inspection Rules
A.1 Test batches and sampling quantities
A.1.1 Test batches
For the benefit of test, the delivery shall be further divided into test batches. The batching rules shall conform to the provisions of 9.3.2.
A.1.2 Sampling quantities per batch
A.1.2.1 The chemical compositions (finished-product analysis) shall take two specimens from different pieces of steel bars.
A.1.2.2 The mechanical property test, and the like tests shall take 15 specimens from different pieces of steel bars (if 60 specimens are applicable, see provisions of A.2.1). A.2 Assessment of test results
A.2.1 Parameter inspection
In order to inspect the specified properties, such as characteristic parameters ReL, Rm, Agt or A, the following parameters shall be determined:
a) All individual values of Xi (n=15) for 15 specimens;
b) Average value m15 (n=15);
c) Standard deviation S15 (n=15).
If all properties satisfy the conditions given in Formula (A.1), then such test batch meet the requirements.
Where:
fk – the required characteristic-value;
2.33 – if n=15, 90% confidence level (1-a = 0.90), the unqualified rate 5% (P=0.95), then it indicates the value of acceptance coefficient k.
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