GB/T 45781-2025Seamless steel tubes for mechanical structures (English PDF)

1 Scope

This document specifies the ordering content, manufacturing process, technical requirements, test methods, inspection rules, packaging,

Logo and quality certificate.

This document applies to seamless steel tubes for machining machinery parts (hereinafter referred to as "steel tubes").

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

GB/T 223.14 Chemical analysis of iron, steel and alloys - Tantalum extraction spectrophotometric method for the determination of vanadium 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 223.26 Iron, steel and alloys - Determination of molybdenum content - Thiocyanate spectrophotometric method

GB/T 223.37 Iron, steel and alloys - Determination of nitrogen content - Distillation separation of indigo blue - Classification photometric method

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

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 223.63 Iron, steel and alloys - Determination of manganese content - Sodium (potassium) periodate spectrophotometric method

GB/T 223.78 Methods for chemical analysis of iron, steel and alloys - Curcumin direct photometric method for the determination of boron content

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 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 231.1 Metallic materials Brinell hardness test Part 1.Test method

GB/T 699 High-quality carbon structural steel

GB/T 2102 Acceptance, packaging, marking and quality certificate of steel pipes

GB/T 2975 Sampling location and specimen preparation for mechanical property tests on steel and steel products

GB/T 3077 Alloy Structural Steel

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 5777 Full circumferential automatic ultrasonic testing of seamless and welded (except submerged arc welded) steel tubes for longitudinal and/or transverse imperfections

GB/T 7735 Automatic eddy current testing of seamless and welded (except submerged arc welded) steel tubes for imperfections

GB/T 10561-2023 Determination of non-metallic inclusions in steel - Microscopic examination method using a graded chart

GB/T 47090 | GB/T 43105 | GB/T 40316 | GB/T 12772 | GB/T 45779 | […]