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Q/BQB 660-2021 English PDF (QBQB660-2021)

Q/BQB 660-2021 English PDF (QBQB660-2021)

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Q/BQB 660-2021: High strength steel plates for pressure vessels
This Standard specifies the size, shape, technical requirements, inspection and test, marking and quality certificates of high-strength steel plates for pressure vessels. This Standard is applicable to high-strength steel plates for large heat input welding (welding heat input ??100kJ/cm) and low welding crack sensitive pressure vessels produced by Baoshan Iron and Steel Co., Ltd.
Q/BQB 660-2021
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 660-2020
High Strength Steel Plates for Pressure Vessels
ISSUED ON: JULY 21, 2021
IMPLEMENTED ON: AUGUST 10, 2021
Issued by: Baoshan Iron and Steel Co., Ltd.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Classification and Code ... 6
4 Information Required for Ordering ... 7
5 Size, Shape, Weight and Allowable Deviation ... 8
6 Technical Requirements ... 8
7 Inspection and Test ... 11
8 Reinspection ... 12
9 Packaging, Marking and Quality Certificate ... 13
10 Rounding-off for Values... 13
Appendix A (Informative) Comparison of Designations ... 14
High Strength Steel Plates for Pressure Vessels
1 Scope
This Standard specifies the size, shape, technical requirements, inspection and test, marking and quality certificates of high-strength steel plates for pressure vessels. This Standard is applicable to high-strength steel plates for large heat input welding (welding heat input ≤100kJ/cm) and low welding crack sensitive pressure vessels produced by Baoshan Iron and Steel Co., Ltd.
2 Normative References
The provisions in following documents become the provisions of this Document through reference in 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) is applicable to this Document. GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel
Products
GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy (Applicable Part) 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 247 General Rule of Package Mark and Certification for Steel Plates (Sheets) and Strips
GB/T 709 Dimensions, Shape, Weight and Tolerances for Hot Rolled Steel Sheets and Strips
GB/T 2975-2018 Steel and Steel Products - Location and Preparation of Samples and Test Pieces for Mechanical Testing
GB/T 4336 Carbon and Low-Alloy Steel - Determination of Multi-Element Contents -Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
GB/T 17505 Steel and Steel Products General Technical Delivery Requirements GB/T 19189-2011 Quenched and Tempered High Strength Steel Plates for
Pressure Vessels
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 20125 Low-Alloy Steel - Determination of Multi-Element Contents -
Inductively Coupled Plasma Atomic Emission Spectrometric Method
NB/T 47013.3 Nondestructive Testing of Pressure Equipment - Part 3: Ultrasonic Testing
3 Classification and Code
3.1 Expression of the designation
The enterprise designation of steel is composed of the first "B" of the first pinyin letter of "Bao" in Baoshan Iron and Steel Co., Ltd., the value of the minimum tensile strength (in MPa), and the English letters representing its characteristics, and the quality grade. Use the first letter of Energy (in English) "E" to indicate the high heat input characteristics; and use the first letters of Crack Free (in English) "CF" to indicate low welding crack sensitivity. The quality grade requires -20°C impact test by default. When -40°C and below impact test is required, it is indicated by the letter “L” in “Low temperature”; and “1” and “2” are used to distinguish -40°C and -50°C impact tests, respectively.
EXAMPLE 1: B610E
B – the first pinyin letter of "Bao" in Baoshan Iron and Steel Co., Ltd.; 610 – 610 is the specified minimum tensile strength value, in MPa;
E - the first letter of Energy (in English) "E" to indicate the high heat input characteristics. EXAMPLE 2: B610CF-L2
B – the first pinyin letter of "Bao" in Baoshan Iron and Steel Co., Ltd.; 5 Size, Shape, Weight and Allowable Deviation
5.1 The allowable deviation of the thickness of the steel plate shall be in accordance with the Class-B requirements in GB/T 709. According to the requirements of the purchaser and the agreement between the supplier and the buyer, it can also meet the requirements of Class-C in GB/T 709.
5.2 The steel plate shall be delivered according to the theoretical weight; and the thickness used for the theoretical weight shall be the arithmetic average of the maximum and minimum allowable thickness of the steel plate.
5.3 The other dimensions, shapes, weights and allowable deviations of the steel plates shall comply with the provisions of GB/T 709.
6 Technical Requirements
6.1 Designations and chemical composition
6.1.1 The steel designation and chemical composition (melting analysis) shall comply with the provisions of Table 2.
6.1.2 The allowable deviation of the chemical composition of the steel plate shall comply with the provisions of Table 2 in GB/T 222-2006, but the upper deviation of the allowable deviation of the P content shall be 0.003%; and the upper deviation of the allowable deviation of the S content shall be 0.002%.
6.2 Smelting method
The steel is smelted by an oxygen converter and processed in a vacuum.
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