1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 07 19 Revised Non-technical revisions, updated and renumbered R. Lord 1981 10 26 Released 7L2-012C-331 Printed copies are uncontrolled Page 1 of 3 Copyright 2002, Ford Global Technologies, Inc. STEEL (H
2、SS) - LOW SULFUR HSLA, 60 KSI ESL-M1A261-A (414 MPa) YIELD 1. SCOPE The material defined by this specification is a fully killed, fine grain high strength low alloy steel containing columbium for strengthening. The material is produced using desulfurization processes to attain low levels of sulfur f
3、or improved formability. Inclusion shape control through the use of additions such as rare earths, zirconium, or titanium is not permitted. 2. APPLICATION This material is intended for use in the manufacturing of light truck wheel rims and discs, but is also applicable to other structural components
4、 and is available in hot rolled gages of 0.071 in (1.8 mm) to 0.375 in (9.5 mm). 3. REQUIREMENTS The following requirements must be substantiated with sample testing by the appropriate materials engineering department prior to supplier approval and, thereafter, as often as deemed necessary by the ma
5、nufacturer. 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (ASTM A 568 or SAE J409) Ladle Analysis (Percent) Carbon 0.10 max Manganese 0.30
6、/0.90 Phosphorus 0.025 max Sulfur 0.010 max Silicon 0.10-0.60 Columbium 0.12 max Aluminum 0.020/0.085 (Aim Only) ENGINEERING MATERIAL SPECIFICATION ESL-M1A261-A Page 2 of 3 Copyright 2002, Ford Global Technologies, Inc. Gages over 0.180 in (4.6 mm) may require additional chemistry. Suppliers desirin
7、g approval to this specification using micro-alloying elements other than columbium or additional chemistry must submit samples to the appropriate materials engineering department for consideration. 3.3 MECHANICAL PROPERTIES (ASTM A 370) Longitudinal Properties Yield Strength (0.2% Offset), min 60 0
8、00 psi (414 MPa) Tensile Strength, min 75 000 psi (518 MPa) Elongation in 2 in (50 mm), min 22 % 3.4 FORMABILITY (ASTM E 290) Transverse test samples shall pass the above mentioned 180 degree bend test at room temperature, using a bend radius not exceeding 1/2 the thickness of the base material. 3.5
9、 WELDABILITY This material shall be weldable using any of the usual processes: shielded metal-arc, submerged-arc, flux-cored arc, gas metal-arc, or resistance welding. Approval for resistance spot weldability will be based on FLTM BA 13-4. Carbon, manganese, and silicon composition provided by the s
10、upplier should reflect the necessity for good weldability for the intended application. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 4.1 MICROSTRUCTURE The microstructure should indicate a uniform f
11、erritic grain size of 10 or finer. Since this material is produced using desulfurization processes, it shall show practically no evidence of stringer type inclusions. 4.2 HARDNESS Rockwell B 80-90 ENGINEERING MATERIAL SPECIFICATION ESL-M1A261-A Page 3 of 3 Copyright 2002, Ford Global Technologies, I
12、nc. 4.3 FATIGUE PROPERTIES For the following properties, refer to SAE J1099 and/or SAE Preprint #740279. Mod. of Elast., E Yield Strength, 0.2% Sy Strain Hard, Exp., n Strength Coeff., K Fatigue Strength Coeff., f Fatigue Ductility Coeff., f1 Fatigue Strength Exp., b Fatigue Ductility Exp., c Transition Fatigue Life, 2Nt (Reversals)
