GB/T 14450-2016Bead wire (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 14450-2008 "Bead Wire". Compared with GB/T 14450-

2008, the main technical changes are as follows.

-- it deletes the examples of marking;

-- it modifies the scope of application;

-- it increases the terms and definitions of out-of-roundness, total elongation at

fracture, yield strength, yield ratio and residual torsion;

-- it modifies Table 2 and sets the breaking forces and their corresponding tensile

strengths of different specifications of wire;

-- it modifies the total elongation at fracture, changing the minimum total elongation

at fracture 5% into the total elongation at fracture of wire >= 5%;

-- it modifies the yield ratio and cancels the division of strength;

-- it cancels the differences of strength in Table 3, divides the torsions by the

specifications and changes the minimum number of torsions into the number of

torsions;

-- it deletes the brass part in Table 4; and

-- it deletes the parts of brass and copper in Table 5 and adds the conversion formula

of coating thickness and coating weight.

This Standard was re-drafted by reference to ISO 16650.2004 "Bead Wire"; it is not

equivalent to ISO 16550.2004.

This Standard was proposed by China Steel Industry Association.

This Standard shall be under the jurisdiction of the National Steel and Iron

Standardization Technical Committee (SAC/TC 183).

The main drafting organizations of this Standard. Shandong Daye Co., Ltd., Ningbo

Xinlun Wire Co., Ltd., China Metallurgical Information and Standardization Institute,

Guizhou Steel Rope (Group) Co., Ltd., Triangle Tire Co., Ltd. and Shandong SNTON

Steel Rope Co., Ltd..

1 Scope

This Standard specifies the terms and definitions, classification and codes, dimensions,

shape, weight and tolerance, order content, technical requirements, test method,

inspection rules, packaging, marking and quality certification of bead wire.

This Standard applies to the tempered round steel wire for all kinds of tire beads

(hereinafter referred to as "wire").

2 Normative References

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition dated applies to this document. For

undated references, the latest edition of the referenced document (including any

amendments) applies to this Standard.

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 239.1 Metallic Materials – Wire – Part 1. Simple Torsion Test (GB/T 239.1-2012,

ISO 7800.2003, MOD)

GB/T 2103 General Requirements for Acceptance, Packing, Marking and Quality

Certification of Steel Wire

GB/T 24242.1 Non-alloy Steel Wire Rods for Conversion to Wire – Part 1. General

Requirements (GB/T 24242.1-2009, ISO 16120-1.2001, MOD)

GB/T 24242.2 Non-alloy Steel Wire Rods for Conversion to Wire – Part 2. Specific

Requirements for General Purpose Wire Rod (GB/T 24242.2-2009, ISO16120-2.2011,

MOD)

GB/T 24242.4 Non-alloy Steel Wire Rods for Conversion to Wire – Part 4. Specific

Requirements for Wire Rod for Special Applications (GB/T 24242.4-2014, ISO 16120-

4.2011, MOD)

YB/T 135 Copper Coated Steel Wire – Test Method for Weight of Copper Coating

and Composition

YB/T 081 Rule for Rounding-off of Numerical Values and Judgement of Testing

Values for Technical Standards of Metallurgy

3 Terms and Definitions

For the purpose of this Standard, the following terms and definitions apply.

4 Classification and Codes

5 straightness One end of a wire coil 1 pc/ coil

Drop down the wire

from a position 500

mm above the

smooth test platform

to make the wire

spread naturally,

then determine its

straightness

6 Residual torsion

One end of

a wire coil As agreed

Fix one end of wire

at one end of the

spool, cut off 4 laps

to 5 laps of wire,

bend the wire end

into 90°, then

rotate the spool,

release wire 6,000

mm long, let go of

the end and then

observe the rotation

laps of wire around

its axis.

During the test, the wire shall not

rub anything

7 Surface quality

A complete

coil for

observation

1 pc/coil Visual inspection

8 Coating composition

One end of

a wire coil

2 coils/

batch

X-ray fluorescent

spectrometry (refer

to Annex B) or

relevant provisions

of YB/T 135

9 Coating weight

One end of

a wire coil

2 coils/

batch

X-ray fluorescent

spectrometry (refer

to Annex B) or

relevant provisions

of YB/T 135

Bronze density is calculated in

accordance with 8.9 g/cm3

Adhesive

force

between

wire and

rubber

See Annex A or as agreed upon by both parties

Note. If the purchaser has other requirements, they shall be decided as agreed upon by both parties.

9 Inspection Rules

10 Packaging, Marking and Quality Certification