TB/T 1619-2010Magnetic particle testing of axle for rolling stock (English PDF)

7.4 of 1998 version);

- MODIFY and ADD magnetization specification equation (see 4.7 of this

version; Clause 6.4 of 1998 version);

- INCLUDE the magnetic particle and magnetic suspension's technical

requirements into Appendix A (see Appendix A of this version);

- ADD the magnetic suspension contamination measurement method, which

is listed in Appendix B (see Appendix B of this version).

This Standard was proposed by and shall be under the jurisdiction of CSR

Qishuyan Institute Co., Ltd.

Magnetic particle testing of axle for rolling stock

5.4 As for the testing parts, after grinding and machining, it shall be subject to

re-testing.

6.1 Unless otherwise specified, it shall follow the provisions of Clause 6.2 ~ 6.4.

6.2 It is not allowed for the transverse cracks, portrait cracks, or transverse hair-

lines existed on the axle surface.

6.3 As for the portrait hair-lines on the axle surface, the allowable limit is as

below.

a) Dust board seat AND wheel seat (excluding the inertia fatigue cracking

zone which is measured 30mm from the wheel seat rear shoulder to the

axle end). the single hair-line length shall not exceed 10 mm; the 2mm ~

10mm length hair-line within the 3870mm2 rectangular area shall not

exceed 10, its long side of rectangle area shall not exceed 152mm, AND

the single hair-line shall not extend to the axle shoulder.

b) The inertia fatigue cracking zone within 30mm from wheel seat to rear

shoulder. the single hair-line length shall not exceed 5 mm; the 2mm ~

5mm length hair-line within the 3870mm2 rectangular area shall not

exceed 10, AND its long side of rectangle area shall not exceed 152mm.

c) Journal. the single portrait hair-line length shall not exceed 25mm, AND

the 2mm ~ 25mm length hair-line along the entire journal surface shall be

not more than 5.

d) Axle body. the single portrait hair-line length shall not exceed 30mm, AND

the 5mm ~ 30mm length hair-line within the 2500m2 rectangular area shall

be not more than 15.

e) As for the aforementioned parts, the hair-line within same section shall be

not more than 3.

f) At each arc of the axle, it is not allowed to exist hair-line.

g) Along the same longitudinal straight line, as for the non-continuous hair-

line which exceeds 5mm of length, its total length shall not exceed 50mm.

h) On each part of axle (except for the arc portion and aforementioned

relevant provisions), if the portrait hair-line length is less than 5mm, not

Appendix A

(Normative)

Magnetic particle and magnetic suspension

A.1 Magnetic particle

The fluorescent magnetic performance shall comply with the provisions of TB/T

2047.1.

A.2 Magnetic suspension

A.2.1 Water magnetic suspension

A.2.1.1 USE the mixed solution of water and certain proportion dispersants,

anti-foaming liquid, and rust inhibitor OR dedicated carrier liquid as the carrier

liquid; the dispersants, anti-foaming liquid, and rust inhibitor, etc., from different

manufacturers shall be added based on the proportions in the product

specification. When preparing magnetic suspension, it shall firstly use a small

amount of dispersant to mix with magnetic particle; STIR it into paste form; AND

then add the remaining dispersants, anti-forming liquid, rust inhibitor, and

sufficient amount of water.

A.2.1.2 The water carrier liquid performance shall comply with the requirements

of TB/T 2047.1.

A.2.2 Oil-based magnetic suspension

A.2.2.1 USE the mixed solution of transformer oil and kerosene at a certain

percentage OR dedicated fluorescent carrier liquid as the carrier liquid. During

preparation, firstly TAKE a small amount of carrier liquid to mix the fluorescent

magnetic particle, to make the fluorescent magnetic particle totally wet; STIR it

into a uniform paste; then ADD the remaining oil-based carrier liquid; STIR it

evenly.

A.2.2.2 The performance of oil-based carrier liquid shall comply with the

requirements of TB/T 2047.1.

A.2.3 Magnetic suspension requirements

Whether it is water magnetic suspension OR oil-based magnetic suspension,

its chemical properties shall be stable, easy to clean, no corrosion against work

Appendix B

(Normative)

Magnetic suspension contamination measurement

B.1 Sampling methods

As for sampling methods and static settlement time of the magnetic suspension

test, see Appendix A.2.6.

B.2 Determination methods of contamination

B.2.1 Once one of the cases specified in B.2.2 ~ B.2.4 occurs, it indicates that

the magnetic suspension has been contaminated.

B.2.2 In accordance with Appendix A.2.6, if the settled magnetic particle is loose

coalescence, rather than a solid layer, it shall be re-sampled; if the second

sample still shows loose coalescence, REPLACE the magnetic suspension.

B.2.3 In black light and visible light, check whether the scale portion of the long-

necked sedimentation tube has different colors, layered appearance, strips OR

streaks, if there is layered appearance, strips OR streaks, it indicates that the

magnetic suspension is contaminated; if the contamination volume exceeds 30%

of the settled magnetic particle volume, it shall replace the magnetic suspension.

B.2.4 During fluorescent magnetic particle testing, if the magnetic suspension

is milky white or light blue, it indicates that the magnetic suspension is

contaminated by grease, AND it shall replace the magnetic suspension.

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