GB/T 34560.6-2017Structural steels -- Part 6: Technical delivery conditions for seismic-improved structural steels for building (English PDF)

1 Scope

This Part of GB/T 34560 specifies the terms and definitions, classification and designation representation, order content, dimension, shape, weight and tolerance, technical requirements, test methods, inspection rules, package, mark, and certification of seismic-improved structural steels for building.

This Part applies to steel plates with a thickness of 6 mm~150 mm, wide flat steels, and hot-rolled section steels with flange thickness not more than 140 mm (hereinafter referred to as “steels”).

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.

GB/T 222 Permissible Tolerances for Chemical Composition of Steel

Products

GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content

GB/T 223.10 Methods for chemical analysis of iron, steel and alloy - The cupferron separation-chrome azurol S photometric method for the determination of aluminium content

GB/T 223.11 Iron, steel and alloy - Determination of chromium content -

Visual titration or potentiometric titration method

GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-

Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the

Determination of Vanadium Content

GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane photometric method for the determination of titanium content

GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The

Sodium Thiosulfate Separation Iodimetric Method for the Determination of

Copper Content

GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The

Dimethylglyoxime Spectrophotometric Method

GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content -

The thiocyanate spectrophotometric method

GB/T 223.27 Methods for chemical analysis of iron, steel and alloy - The thiocyanate-butyl acetate extraction spectrophotometric method for the determination of molybdenum content

GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the

Sulphochlorophenol S Spectrophotometric Method

GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content

GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content

GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy - The

Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the Determination of Sulfur Content

GB/T 223.69 Iron, steel and alloy - Determination of carbon contents - Gas- volumetric method after combustion in the pipe furnace

GB/T 223.75 Iron steel and alloy - Determination of boron content - Methanol distillation-curcumin photometric method

GB/T 223.76 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content

GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature (GB/T 228.1-2010, ISO 6892-1:2009 MOD)

GB/T 229 Metallic materials - Charpy pendulum impact test method (GB/T

229-2007, ISO 148-1:2006, MOD)

4 Classification and designation representation

4.1 According to GB/T 13304.1, the steel of this Part is classified into unalloyed steel and low-alloy steel.

4.2 The steel designation consists of four parts: the first letter Q of Chinese phonetic alphabet representing “Qu” of yield strength, specified minimum upper yield strength value, the initials “KZ” of Chinese phonetic alphabet for “seismic- improved”, quality grade symbol (C, D, E, F).

Example: Q3450KZE

Where:

Q - The first letter of Chinese phonetic alphabet of “Qu” for yield strength of steel;

345 - The specified minimum upper yield strength value, in megapascals (MPa);

KZ - Represent “seismic-improved”;

E - The quality grade is Grade E.

4.3 When the purchaser requires the steel plate to have the through-thickness (Z-direction) characteristics, after the above specified designation, ADD the through-thickness characteristics level of the steel plate, such as Q345KZEZ25.

5 Order content

5.1 Contracts or orders for ordering according to this Part shall include the following:

a) Standard number;

b) Product type;

c) Steel grade + delivery condition + quality grade;

d) Dimension, shape, and tolerance;

e) Selected content of all requirements;

f) Type of inspection document.

1 Extend the applicable thickness range of the steel plate to 150 mm

Adapt to China’s technical conditions and requirements

About normative references, this Part has made adjustments with technical differences. The adjustments are reflected in Clause 2 “Normative references”, as follows:

- ADD reference to GB/T 222;

- ADD references to GB/T 223.3, GB/T 223.9,

223.17, GB/T 223.18, GB/T 223.23, GB/T 223.26,

GB/T 223.37, GB/T 223.40, GB/T 223.69, GB/T

223.77;

- ADD reference to GB/T 247;

- ADD reference to GB/T 702;

- ADD reference to GB/T 709;

- ADD reference to GB/T 4336;

- ADD reference to GB/T 11263;

- ADD reference to GB/T 20125;

- Replace ISO 7452:2013 and ISO 9034:1987 with

GB/T 706;

- Replace ISO 7778 with GB/T 5313

Adapt to the actual production situation in

China