1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 07 31 Revised Updated and renumbered 1978 11 10 Metricated and Retyped 1969 03 06 Released CHY2-DR-913899 Original /s/ J. Raus Printed copies are uncontrolled Page 1 of 2 Copyright 2002, Ford Global Tec
2、hnologies, Inc. STEEL, 110,000 PSI (758 MPa) YIELD EST-M1A154-A STRENGTH - HEAT TREATABLE 1. SCOPE The material defined by this specification is a hot-rolled, scale-free steel made by either open hearth, electric furnace, or basic oxygen process. 2. APPLICATION This specification was released origin
3、ally for materials used for truck frame side rails, reinforcements and other applications where additional physical properties are obtained by heat treatment. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standar
4、d Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION Carbon 0.22 - 0.27 Manganese 0.85 - 1.20 Phosphorus 0.04 max Sulphur 0.05 max Silicon 0.30 max 3.3 MECHANICAL PROPERTIES AFTER HEAT TREATMENT (Water Quench and Temper at 538 C Minimum) (ASTM E 8 and ASTM E 10) 3.3.1 T
5、ensile Strength, min 125,000 psi (862 MPa) 3.3.2 Yield Point, min 110,000 psi (758 MPa) 3.3.3 Elongation, min 12.0 % 3.3.4 Hardness, Brinell 269 - 331 ENGINEERING MATERIAL SPECIFICATION EST-M1A154-A Page 2 of 2 Copyright 2002, Ford Global Technologies, Inc. 3.4 BEND TEST The test specimen shall bend
6、 at room temperature, 180 around a mandrel having a diameter twice the thickness of the specimen without rupture. 3.5 MATERIAL ENDURANCE LIMIT AFTER HEAT TREATMENT (As Processed) The B-10 endurance limit shall not be less than 37,500 psi (258 MPa) for test specimens selected at random. A constant m
7、oment bending specimen is to be used for fatigue evaluation, the configuration of which is shown below. The top and bottom surfaces are to be as processed in the production state. The staircase technique is to be used for determining the endurance limit. Ref: ASTM Special Tech. Pub. No. 91A, “A Guide for Fatigue Testing & Statistical Analysis of Fatigue Data,“ (Philadelphia, 1963) pp 48, 49. Conversion Chart in mm 0.50 12.7 1.00 25.4 1.25 31.8 3.62 91.9 5.75 146.1
