1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 09 30 Revised Rev para 3.7, 3.8 & updated G. Hagler 2002 02 15 Reactivated K. Thurgood, G. Hagler 1986 07 03 SM/ER 3662TC Released J. P. C. Lines. EAO. Printed copies are uncontrolled Page 1 of 3 Copyri
2、ght 2002, Ford Global Technologies, Inc. STEEL, RETAINING AND SNAP RINGS WSD-M1A82-B 1. SCOPE The material defined by this specification is a flat or round spring steel wire suitable for the manufacture of snap rings. 2. APPLICATION This specification was released originally for material used for re
3、taining rings and snap rings of different types. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For
4、Production Materials (WSS-M99P1111-A). 3.2 MATERIAL Optional for different type of rings. 3.2.1 Annealed Wire 3.2.2 Oil Tempered Wire 3.2.3 Hot Rolled or Cold Drawn Annealed Spring Steel Strip 3.2.4 Hard Drawn Wire ENGINEERING MATERIAL SPECIFICATION WSD-M1A82-B Page 2 of 3 Copyright 2002, Ford Globa
5、l Technologies, Inc. 3.3 CHEMICAL ANALYSIS (W/T %) Carbon 0.50 - 1.00 Manganese 0.20 - 0.90 Silicon 0.10 - 0.50 Phosphorus 0.045 max Sulphur 0.045 max For full hard drawn wire, the following analysis is permitted: Carbon 0.6 - 0.8 Manganese 0.75 - 1.15 Silicon - Phosphorus 0.045 max Sulphur 0.05 max
6、 3.4 HEAT TREATMENT Rings produced from annealed material shall be oil hardened and tempered with optional austempering being allowed. 3.5 DIMENSIONAL STABILITY All snap rings manufactured under this material specification shall be stress relieved as necessary to achieve dimensional stability at 200
7、 C. Snap rings when subjected to 200 C for 2 hours, in a free state, must not have a dimensional change in the gap greater than 5% of the total tolerance of the gap. 3.6 HARDNESS (ISO 6507/3, ASTM E 18) Rings up to and including 38 mm shaft diameter at a thickness of: up to 0.38 mm 84 - 87 HR15N 0.3
8、9 - 0.64 mm 65 - 70 HR30N above 0.65 mm 40 - 51 HRC Rings exceeding 38 mm shaft diameter at a thickness of: up to 0.38 mm 82 - 85 HR15N 0.39 - 0.64 mm 63 - 68 HR30N above 0.65 mm 40 - 51 HRC ENGINEERING MATERIAL SPECIFICATION WSD-M1A82-B Page 3 of 3 Copyright 2002, Ford Global Technologies, Inc. The
9、 values given apply to heat treated rings and to rings produced from quenched and tempered wire and to rings produced from patented drawn spring wire. In the case of austempering both ranges can be increased by two HRC (or converted to HR15N/HR30N, respectively) values. If different hardness values
10、are required these must be given on the drawing accordingly. 3.7 BEND AND FRACTURE TEST When bending the ring by 30 degrees the ring shall not fracture (Fig. 1). It shall be bent slowly and steadily taking appropriate care against the risk of snapping-off ends. Figure 1 3.8 DECARBURIZATION Partial surface decarburization is allowed up to a depth of 0.05 mm max. Check on cross sections at 200X magnification. Total decarburization is not permitted on hard drawn wire and partial decarburization is allowed up to depth of 0.04 mm max.
