GB/T 9945-2025Hot-rolled bulb flats (English PDF)

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. […]