GB/T 45779-2025Welded shaped steel tubes for structure (English PDF)

1 Scope

This document specifies the classification and code, ordering content, manufacturing process, technical requirements, test methods, inspection

Regulations, marking, packaging, storage and quality certificates.

This document is applicable to welded special-shaped steel pipes (with (hereinafter referred to as "steel pipe").

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 223.9 Iron, steel and alloys - Determination of aluminum content - Chrome azurol S spectrophotometric method

GB/T 223.11 Determination of chromium content in steel and alloys - Visual titration or potentiometric titration method

GB/T 223.12 Methods for chemical analysis of iron, steel and alloys - Sodium carbonate separation-diphenylcarbazide photometric 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 223.18 Methods for chemical analysis of iron, steel and alloys - Sodium thiosulfate separation-iodine titration method for the determination of copper content

GB/T 223.19 Methods for chemical analysis of iron, steel and alloys - Determination of copper content by the new cuproline-chloroform extraction spectrophotometric method

GB/T 223.23 Iron, steel and alloys - Determination of nickel content - Dimethylglyoxime spectrophotometric method

GB/T 223.25 Methods for chemical analysis of iron, steel and alloys - Dimethylglyoxime gravimetric method for the determination of nickel content

GB/T 223.26 Iron, steel and alloys - Determination of molybdenum content - Thiocyanate spectrophotometric method

GB/T 223.28 Methods for chemical analysis of iron, steel and alloys - alpha-Benzoin oxime gravimetric method for the determination of molybdenum content

GB/T 223.36 Methods for chemical analysis of iron, steel and alloys - Separation by distillation - Neutralization titration method for the determination of nitrogen content

GB/T 223.37 Iron, steel and alloys - Determination of nitrogen content - Indigo blue spectrophotometric method using distillation separation

GB/T 223.40 Iron, steel and alloys - Determination of niobium content - Chlorosulfonylphenol S spectrophotometric method

GB/T 223.53 Chemical analysis of iron, steel and alloys - Flame atomic absorption spectrophotometric method for the determination of copper content

GB/T 223.58 Methods for chemical analysis of iron, steel and alloys - Sodium arsenite-sodium nitrite titration method for the determination of manganese content

GB/T 223.59 Iron, steel and alloys - Determination of phosphorus content - Bismuth phosphomolybdenum blue spectrophotometric method and antimony phosphomolybdenum blue spectrophotometric method

GB/T 223.60 Iron, steel and alloys - Determination of silicon content - Gravimetric method

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 223.64 Iron, steel and alloys - Determination of manganese content - Flame atomic absorption spectrometry

GB/T 223.72 Iron, steel and alloys - Determination of sulfur content - Gravimetric method

GB/T 223.81 Iron, steel and alloy - Determination of total aluminum and total boron content - Microwave digestion-inductively coupled plasma mass spectrometry

GB/T 223.84 Iron, steel and alloys - Determination of titanium content - Diantipyryl methane spectrophotometric method

GB/T 223.85 Iron, steel and alloys - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace

GB/T 223.86 Iron, steel and alloys - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace

GB/T 47090 | GB/T 43105 | GB/T 40316 | GB/T 12772 | GB/T 45781 | […]