1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 07 24 Revised Updated and renumbered 1998 09 23 Activated K.J. Thurgood (FAO) Printed copies are uncontrolled Page 1 of 5 Copyright 2002, Ford Global Technologies, Inc. STEEL, SUSPENSION STABILIZER BAR
2、WSS-M1A272-B 1. SCOPE The materials described by this specification are plain carbon and low alloy steels for section sizes up to 65 mm diameter. 2. APPLICATION These materials were released originally for use in the manufacture of front and rear suspension stabilizer bars. 3. REQUIREMENTS 3.1 STAND
3、ARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 SYSTEMS APPROVAL The materials described by this specification shall be subject to a source “Systems Approval“ i.e. both t
4、he component supplier and steel supplier shall be approved in tandem. 3.3 GENERAL REQUIREMENTS The bar or rod shall be rolled from billet feedstock which has been surface cleaned by a suitable method such as pickling and chipping, machining or shot blasting. The rolled bar or rod shall be turned and
5、 burnished, ground or drawn to the following surface finish requirements. Machined bar shall have a maximum CLA (center line average) of 0.8 micrometers and ground bar shall have a maximum CLA of 3.2 micrometers and drawn bar shall have a maximum CLA of 2.0 micrometers. ENGINEERING MATERIAL SPECIFIC
6、ATION WSS-M1A272-B Page 2 of 5 Copyright 2002, Ford Global Technologies, Inc. 3.4 REQUIREMENTS FOR FINISHED STABILIZER BARS 3.4.1 General Restrictions 3.4.1.1 The component drawing may specify a restricted list of steel types together with other requirements such as hardness, surface condition, peen
7、ing control, etc., which have been applied to stabilizer bars that have successfully met the rig and durability requirements. 3.4.1.2 No steel other than those proved to be acceptable by prototype testing may be used in production unless prior approval from Ford Product Development is obtained. 3.4.
8、1.3 The component engineer must be supplied with the composition and properties of each batch of prototype stabilizer bars. 3.4.2 Chemical Composition This shall form part of the Control Plan. General information is shown in para 4.2. 3.4.3 Grain Size The steel shall have an austenitic grain size of
9、 4 or finer. 3.4.4 Hardenability The steel used shall be controlled to have adequate hardenability for the section size of the component. Its hardenability shall be ensured by progressing a pilot sample of the stock through the production heat treatment for individual component processing to conform
10、 to para 3.4.4.1. Steels heat treated prior to stabilizer bar forming shall be controlled primarily by Jominy end quench tests or simulations. All treatments shall comply with paras. 3.4.4.2 and 3.4.5. 3.4.4.1 Hardness “As Quenched“ After removing any decarburized layer, the surface hardness must be
11、: HRC 56 minimum or HB 2/120 or 5/750* 555 minimum or HV/30 610 minimum *Using Tungsten Carbide Ball or Cemented Alloy Carbide Ball. The surface must be free from cracks when examined immediately after quenching. ENGINEERING MATERIAL SPECIFICATION WSS-M1A272-B Page 3 of 5 Copyright 2002, Ford Global
12、 Technologies, Inc. 3.4.4.2 Hardness after Tempering After tempering to the hardness range specified on the drawing, the average hardness differential between surface (after removal of decarburization) and the center of the section shall not be greater than: 35 points Brinell for bar diameters up to
13、 50 mm 50 points Brinell for bar diameters over 50 mm 3.4.5 Surface Finish and Decarburization (FLTM EU-BA 53-1) After heat treatment there must not be any complete decarburization but partial decarburization is permitted according to the following: Partial decarburization 0.15 mm maximum for bar di
14、ameters up to and including 13 mm. Partial decarburization 0.20 mm maximum for bar diameters over 13 - up to and including 20 mm. Partial decarburization 1.0 % of bar diameter maximum for bar diameters over 20 mm. The stabilizer bar shall be free from cracks. Surface inspection by visual or magnetic
15、 defect examination techniques shall be carried out in the unpainted state, if stated on the Engineering Drawing. The maximum depth of surface imperfections shall be 0.15 mm. 3.4.6 Control of Hardenability and Heat Treatment 3.4.6.1 The hardenability and heat treatment of the steel in production sha
16、ll be controlled by the supplier by any suitable means such that any sample taken from production will meet the requirements of para 3.4.4.1 and 3.4.4.2. The minimum tempering temperature is 370 C. 3.4.6.2 All parts which are to be heat treated to a surface hardness of HV390 or greater must be clean
17、ed prior to heat treatment by alkaline or inhibited acid process to remove all phosphate and associated lubricant residues from the surface. 3.4.6.3 Carburization of through hardened parts is not permitted unless specified on the Engineering Drawing. The surface hardness of all through hardened part
18、s must not exceed the sub-surface hardness by more than 30 Vickers points, determined by the HV 0.3 method. The sub-surface hardness position is defined as a point 0.5 mm below the surface. ENGINEERING MATERIAL SPECIFICATION WSS-M1A272-B Page 4 of 5 Copyright 2002, Ford Global Technologies, Inc. 3.4
19、.7 Microstructure The microstructure shall consist of tempered martensite and similar transformation products. Pearlite is not allowed. Free ferrite may only be present in the decarburized zone (see para 3.4.5) 4. GENERAL INFORMATION The information given below is provided for clarification and assi
20、stance in meeting the requirements of the specification. Shot Peening ) To be specified Surface Coating ) on the Engineering Crack Detection ) Drawing or in the Fatigue Requirement ) Engineering Hardness ) Specification. 4.1 Various user, national and international standard grades that fall within t
21、he stated analytical ranges are listed in para 4.2. 4.2 Chemical Composition Previously used suffices are shown below for reference purposes only: A1 A2 A3 55Cr3, SAE 5155 ISO Type 8 080A67 Type CK 67 Type RVSS 100/1 CCrl C 0.65 - 0.70 0.65 - 0.72 0.51 - 0.60 Si 0.05 - 0.35 0.25 - 0.50 0.15 - 0.40 M
22、n 0.70 - 1.10 0.60 - 0.80 0.70 - 1.00 Cr 0.30 maximum 0.40 maximum 0.60 - 0.90 P 0.05 maximum 0.04 maximum 0.04 maximum S 0.05 maximum 0.04 maximum 0.04 maximum Mo - - - V - - - ENGINEERING MATERIAL SPECIFICATION WSS-M1A272-B Page 5 of 5 Copyright 2002, Ford Global Technologies, Inc. A4 A5 A6 SAE 51
23、60, 527A60 250A58, 250A61 ISO Type 9, ISO Type 6 or 7 RVSS 100/1, SAE 9260 CCr2 and CCr3 RVSS 100/1 SiMn2 60SiCr7 C 0.55 - 0.65 0.55 - 0.65 0.55 - 0.65 Si 0.15 - 0.40 1.70 - 2.20 1.50 - 1.80 Mn 0.70 - 1.05 0.70 - 1.00 0.70 - 1.00 Cr 0.60 - 1.00 0.40 maximum 0.20 - 0.40 P 0.04 maximum 0.04 maximum 0.
24、045 maximum S 0.04 maximum 0.04 maximum 0.045 maximum Mo - - - V - - - A7 A8 A9 f143, SAE 6150, f140c, f144c 50CrV4, 735A50, ISO Type 7 CK53 + Cr ISO Type 13 C 0.55 - 0.65 0.50 - 0.57 0.45 - 0.57 Si 1.45 - 2.00 0.15 - 0.35 0.10 - 0.40 Mn 0.65 - 0.95 1.05 - 1.25 0.50 - 1.15 Cr 0.20 - 0.50 0.25 minimu
25、m 0.80 - 1.20 P 0.04 maximum 0.04 maximum 0.04 maximum S 0.04 maximum 0.04 maximum 0.04 maximum Mo - - - V - - 0.10 - 0.30 A10 A11 A12 SAE 4161, SAE 1090 ISO Type 1 51CrMoV4 RVSS 100/1 ISO Type 14 CrMo1 CrMo2 C 0.48 - 0.57 0.55 - 0.64 0.84 - 0.98 Si 0.15 - 0.40 0.15 - 0.40 - Mn 0.70 - 1.10 0.70 - 1.00 0.60 - 0.90 Cr 0.90 - 1.20 0.70 - 0.90 - P 0.035 maximum 0.035 maximum 0.04 maximum S 0.035 maximum 0.040 maximum 0.04 maximum Mo 0.15 - 0.25 0.15 - 0.35 - V 0.07 - 0.12 - -
