GB/T 6983-2022Magnetic iron (English PDF)

Foreword

This document was drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document replaces GB/T 6983-2008 Soft magnetic iron. Compared with GB/T 6983-2008, the main technical changes are as follows:

-- Delete continuous casting square billet, continuous casting rectangular billet, continuous casting slab and bloom from the scope of application (see Chapter 1 of the 2008 edition);

-- Add requirements for vacuum refining treatment (see 7.2);

-- Add requirements for delivery status (see 7.3);

-- Change the requirements for electromagnetic property index (see Table 2;

-- Change the requirements for low-magnification inspection (see 7.6; 7.4 of the 2008 edition);

-- Add requirements for type inspection (see 9.2.1).

1 Scope

This document specifies the classification, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of magnetic iron.

This document is applicable to magnetic iron hot-rolled (forged) bars (square, round, flat), hot-rolled wire rods, cold-drawn round bars, hot-rolled plates (strips), and cold-rolled plates (strips).

Note: Magnetic iron is also called soft magnet internationally.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.

GB/T 223.5, Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method

GB/T 223.8, Methods for chemical analysis of iron, steel and alloy - The sodium fluoride separation - EDTA titration method for the determination of aluminium content

GB/T 223.9, Iron, steel and alloy - Determination of aluminum content - Chrom azurol S photometric method

GB/T 223.12, Methods for chemical analysis of iron, steel and alloy - The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content

GB/T 223.19, Methods for chemical analysis of iron, steel and alloy - The neocuproine-chloroform extraction photometric 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 20125, Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method

GB/T 20126, Unalloyed steel - Determination of low carbon content - Part 2: Infrared absorption method after combustion in an induction furnace (with preheating)

3 Terms and definitions

No terms and definitions need to be defined in this document.

4 Classification

Magnetic iron is divided into hot-rolled (forged) bars (square, round, flat), hot-rolled wire rods, cold-drawn round bars, hot-rolled plates (strips), and cold-rolled plates (strips).

5 Order content

The contract or order for goods placed in accordance with this document shall include the following:

a) a reference to this document;

b) product name:

c) product designation;

d) electromagnetic property;

e) delivery weight;

f) dimensions;

g) delivery status; h) special requirements.

6 Dimensions, shape, weight

7 Technical requirements

7.8.2 The magnetic iron cold-rolled plates (strips) delivered in the softened annealed state shall be subjected to surface hardness test. Three points of each sample shall be measured and the average value shall be taken as the measurement result of a single sample. The Vickers hardness value (HV5) shall be 85~140.

8 Test methods

8.1 The chemical composition analysis shall be carried out in accordance with GB/T 223.79, GB/T 4336, GB/T 20123 or other common methods. In case of arbitration, it shall be carried out in accordance with the provisions of GB/T 223.5, GB/T 223.8, GB/T 223.9, GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T 223.53, GB/T 223.54, GB/T 223.59, GB/T 223.62, GB/ T223.63, GB/T 223.64, GB/T 223.81, GB/T 223.84, GB/T 223.85, GB/T 223.86, GB/T 20125 or GB/T 20126.

8.2 The test methods for other items shall comply with the requirements of Table 8.

9 Inspection rules