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GB/T 9945-2025: Hot-rolled bulb flats
Status: Valid GB/T 9945: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 9945-2025 | English | 289 |
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3 days [Need to translate]
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Hot-rolled bulb flats
| Valid |
GB/T 9945-2025
|
| GB/T 9945-2012 | English | 279 |
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3 days [Need to translate]
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Hot-rolled bulb flats
| Valid |
GB/T 9945-2012
|
| GB/T 9945-2001 | English | 439 |
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4 days [Need to translate]
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Hot-rolled bulb flat steel
| Obsolete |
GB/T 9945-2001
|
| GB/T 9945-1988 | English | 279 |
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3 days [Need to translate]
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Bulb flat steel for shipbuilding
| Obsolete |
GB/T 9945-1988
|
PDF similar to GB/T 9945-2025
Basic data | Standard ID | GB/T 9945-2025 (GB/T9945-2025) | | Description (Translated English) | Hot-rolled bulb flats | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H44 | | Classification of International Standard | 77.140.70 | | Word Count Estimation | 14,159 | | Date of Issue | 2025-06-30 | | Date of Implementation | 2026-01-01 | | Older Standard (superseded by this standard) | GB/T 9945-2012 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 9945-2025: Hot-rolled bulb flats---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/GBT9945-2025
National Standard of the People's Republic of China
ICS 77.140.70CCS H 44
Hot rolled bulb flat steel
Hot⁃rolled bulb flats
Released on June 30, 2025
2026-01-01 implementation
State Administration for Market Regulation
The National Standardization Administration issued
Replaces GB/T 9945-2012
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
This document replaces GB/T 9945-2012 Hot-rolled bulb flat steel. Compared with GB/T 9945-2012, except for structural adjustments and editorial changes,
In addition to the dynamic, the main technical changes are as follows.
--The scope of application has been changed (see Chapter 1, Chapter 1 of the.2012 edition);
--Added bulb flat steel models (see Table 1);
--The theoretical weight of bulb flat steel has been changed (see Table 1 of the.2012 edition);
--Changed the normal length requirements for bulb flat steel (see 5.1.2, 4.1.2 of the.2012 edition);
--Changed the curvature requirements (see 5.2.1, 4.2.1 of the.2012 edition);
--Added requirements for end burrs (see 5.2.3);
--Added requirements for ball head bending deformation (see 5.2.4);
--Changed the weight tolerance of bulb flat steel (see 5.3, 4.3 of the.2012 edition);
--Changed the values of grain-refining element combinations in the chemical composition of high-strength bulb flat steel (see Table 3,.2012 edition)
Table 3);
--Changed the surface quality requirements (see 6.5, 5.5 of the.2012 edition);
--The batching rules have been changed (see 8.2, see 7.2 of the.2012 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAC/TC 183).
This document was drafted by. Changshu Longteng Special Steel Co., Ltd., Taixing Jufeng Rolling Technology Co., Ltd., Suqian Nangang Jinxin Steel Rolling
Co., Ltd., Anshan Zizhu Light Special Steel Co., Ltd., and Metallurgical Industry Information Standards Research Institute.
The main drafters of this document are. Ji Bingyuan, Xu Sheng, Zhao Xun, Li Chunshan, Wu Jiajun, Liu Baoshi, Pu Hongbing, Jiang Kun, Liu Junjun, Hong Ze, Wang Yujie,
Ma Liang, Xu Haochi, and Zhou Jun.
The previous versions of this document and the documents it replaces are as follows.
--First published as GB/T 9945-1988 in 1988, first revised in.2001, and second revised in.2012;
--This is the third revision.
Hot rolled bulb flat steel
1 Scope
This document specifies the order content, model, size, shape, weight and tolerance, technical requirements, inspection rules, packaging,
Marks and quality certificates, etc., describe the corresponding test methods.
This document is applicable to hot-rolled asymmetric bulb flat steel for applications such as shipbuilding, marine engineering, bridge engineering and steel structures.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 222 Permissible deviations of chemical composition of finished steel products
GB/T 223.5 Determination of acid-soluble silicon and total silicon content of iron and steel - Reduced molybdenum silico-silicic acid spectrophotometric method
GB/T 223.9 Iron, steel and alloys—Determination of aluminum content—Chrome azurol S spectrophotometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloys - Sodium carbonate separation - Diphenylcarbazide spectrophotometric method for the determination of chromium content
GB/T 223.14 Chemical analysis of iron, steel and alloys - Tantalum extraction spectrophotometric method for the determination of vanadium content
GB/T 223.16 Methods for chemical analysis of iron, steel and alloys—The chromotropic acid photometric method for the determination of titanium content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloys - The new cuproline-chloroform extraction spectrophotometric method for the determination of copper content
GB/T 223.26 Iron, steel and alloys—Determination of molybdenum content—Thiocyanate spectrophotometric method
GB/T 223.40 Iron, steel and alloys - Determination of niobium content - Chlorosulfonylphenol S spectrophotometric method
GB/T 223.54 Iron, steel and alloys - Determination of nickel content - Flame atomic absorption spectrometry
GB/T 223.62 Methods for chemical analysis of iron, steel and alloys - Determination of phosphorus content - Spectrophotometric method with butyl acetate extraction
GB/T 223.63 Iron, steel and alloys—Determination of manganese content—Sodium (potassium) periodate spectrophotometric method
GB/T 223.69 Iron, steel and alloys - Determination of carbon content - Gas volumetric method after combustion in a tube furnace
GB/T 223.72 Iron, steel and alloys - Determination of sulfur content - Gravimetric method
GB/T 228.1 Tensile tests on metallic materials Part 1.Room temperature test methods
GB/T 229 Charpy pendulum impact test method for metallic materials
GB/T 2101 General provisions for acceptance, packaging, marking and quality certification of steel sections
GB/T 2975 Sampling location and specimen preparation for mechanical property tests on steel and steel products
GB/T 4336 Carbon steel and medium and low alloy steel - Determination of multi-element content - Spark discharge atomic emission spectrometry (conventional method)
GB/T 20066 Sampling and preparation of samples for determination of chemical composition of steel and iron
GB/T 20123 Determination of total carbon and sulfur content of steel - Infrared absorption method after combustion in a high-frequency induction furnace
GB/T 20125 Low alloy steel - Determination of multi-element content - Inductively coupled plasma atomic emission spectrometry
YB/T 081 Principles for rounding off values and determining test values in metallurgical technical standards
3 Terms and Definitions
The following terms and definitions apply to this document.
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