MS-786-2003琴钢丝.pdf
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- MS 786 2003 钢丝
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DAIMLERCHRYSLER CORPORATION
No: MS-786
Material Standard
Date Published: 2003-04-09
Category Code: B-3
Change: M
EASL Req: No
RESTRICTED: No
MUSIC STEEL SPRING WIRE AND SPRINGS
10 GENERAL
1.1 Caution on Use
asteners, springs or clips manufactured from this material, that are surface treated to improve their
cleanliness, appearance or corrosion resistance, may become hydrogen embrittled when exposed to th
chemicals and coating methods used in processing. Consequently, if these parts are surface treated, it is
required that such parts be relieved for hydrogen embrittlement according to the procedures described in
PS-9500.
1.2 Purpose of the Standard
This standard covers a round high quality, hard drawn, carbon steel spring wire that is uniform in
mechanical properties
1.3 Purpose of the Material
This material is specifically intended for the manufacture of springs subjected to high stresses and/or
requiring good fatigue properties
1. 4 Coverage of this Standard
This standard covers the chemical, mechanical, dimensional and surface quality of the base wire material
In addition, it covers the processing requirements of the springs fabricated from this wire
5 Correlation of other Standards
The content of this standard more closely resembles that of SAE J178, than ASTM A228/A228M
2.0 MATERIAL CHARACTERISTICS
2.1 General Requirements
This steel wire shall be made in accordance to approved commercial practices for this grade of higl
quality wire. It shall be uniform in chemistry and quality; clean, sound and free from all surface and
internal defects detrimental to the fabrication, performance or appearance of the parts for which it is
intended
The high quality requirements for this hard drawn wire over other types of mechanical spring wire involve
very close control of the following
Selective application of heats of steel or portions thereof
Special hot rolling practices
Appropriate wire mill practices in the manufacturing process involving the thermal treatment and
cold drawing operations
MS-786, Change M, 2003-04-09, Page 1
Copyright Daimlerchrysler Corporation 1993
(2003-02-05)
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