1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2003 03 13 Revised Para 3.0 Inserted; Paras 3.1, 3.6, 3.7, 4 Deleted 1994 04 19 Revised Added A2; Completely revised; Updated G. Weber 1994 09 16 NE01E10127076140 Released P. Lee G. Lane Printed copies are u
2、ncontrolled Page 1 of 4 Copyright 2003, Ford Global Technologies, Inc. STEEL, FERRITIC STAINLESS, CAST WSE-M1A329-A1 STEEL, AUSTENITIC STAINLESS, CAST WSE-M1A329-A2 1. SCOPE The materials defined by these specifications are cast stainless steels. The A1 grade is a ferritic stainless steel, while the
3、 A2 grade is an austenitic stainless steel. 2. APPLICATION These specifications were released originally for exhaust manifold applications. The A1 grade is suitable for service temperatures up to 870 C, and the A2 grade for service temperatures up to 980 C. Manifolds made to the A1 grade may be heat
4、 treated, if required, to attain thermalstability and required microstructural and mechanical properties. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111
5、-A). 3.2 CHEMICAL COMPOSITION (Weight Percent) A1 A2 Carbon 0.20 max 0.40 - 0.50 Silicon 0.50 - 2.25 0.80 - 1.25 Manganese 2.00 max 0.75 - 1.10 Molybdenum 1.00 - 2.25 0.50 max Phosphorus 0.05 max 0.04 max Sulfur 0.02 max 0.11 - 0.15 Chromium 17.0 - 21.0 24.0 - 27.0 Nickel 1.00 max 12.0 - 15.0 Titani
6、um 0.50 max - Niobium 0.5 - 1.50 1.70 - 2.10 Vanadium 0.75 max - Nitrogen 0.10 - 0.20 0.08 - 0.40 Others - 0.50 max Iron Balance Balance Specific composition limits and foundry practices to meet performance and manufacturing requirements will form part of an agreed Control Plan for individual compon
7、ent geometries and process routes. ENGINEERING MATERIAL SPECIFICATION WSE-M1A329-A1/A2 Page 2 of 4 Copyright 2003, Ford Global Technologies, Inc. Composition shall be selected generally from within the above range in order to provide a material which will respond well to heat treatment and will meet
8、 microstructural, machinability, hardenability and strength requirements. 3.3 MECHANICAL PROPERTIES Tensile, compressive, and shear properties are to be measured on separately cast test bars. Test bar diameters and solidification rates should be such that the microstructure and properties are commen
9、surate with the manifold as supplied to the manufacturer. A1 A2 3.3.1 Tensile Properties (ASTM E 8M/ISO 6892) Ultimate Tensile 410 Mpa 550 MPa Strength, min Yield Strength 370 Mpa 310 MPa (0.2 % Offset), min Elongation, min 2 % 7 % 3.3.2 Compressive Yield 370 Mpa 310 MPa Strength (0.2 % Offset), min
10、 (ASTM E 9) 3.3.3 Shear Strength, min 460 Mpa 400 MPa (ASTM B 769) 3.3.4 Hardness (Unless otherwise stated on Engineering drawing) ASTM E 10/ISO 6506, ASTM E 18/ISO 6508) Bolt Boss Hardness, HB 140 190 187 - 248 (As supplied to manufacturer) For large volume surveys on heat treated manifolds, agreem
11、ent may be reached between foundry and manufacturing on the manner of checking bolt boss hardness after heat treatment and before machining, providing the finished component hardness is met. This agreement is to be part of the control plan. ENGINEERING MATERIAL SPECIFICATION WSE-M1A329-A1/A2 Page 3
12、of 4 Copyright 2003, Ford Global Technologies, Inc. 3.4 MICROSTRUCTURE 3.4.1 As-Cast Microstructure A1: The microstructure shall consist of 90 % minimum chromium rich ferrite distributed uniformly throughout the component. A2: The micros structure shall consist of an austenitic matrix with 7 % maxim
13、um carbides finely distributed. Carbides shall not form a continuous network. 3.4.2 Heat Treated Microstructure (A1 only) The heat treated microstructure shall consist of a ferritic matrix stabilized at 790 C and enhanced by Llaves phase hardening. 3.5 CLEANLINESS, CASTING QUALITY (ASTM E 446) Finis
14、hed component shall be free of loose sand, oxide and scale. No inclusions are permitted in the component which are over 30 micrometers in size. The exact location and quantities of allowable defects in the different areas of the castings will need to be determined between supplier and purchaser. Cas
15、ting porosity shall be outlined per ASTM E 446. Shrinkage is not permitted in critical areas of the castings, per agreement between supplier and purchaser. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specificati
16、ons. 5.1 REFERENCE DOCUMENTS The following documents are referenced in these specifications: ASTM B769 ASTM E21 ISO 6508 ASTM E8M ASTM E209 ISO 6892 ASTM E9 ASTM E446 QS-9000 ASTM E10 ISO 6506 WSS-M99P9999-A1 ASTM E18 WSS-M99P1111-A ENGINEERING MATERIAL SPECIFICATION WSE-M1A329-A1/A2 Page 4 of 4 Cop
17、yright 2003, Ford Global Technologies, Inc. 5.2 MECHANICAL PROPERTIES AT 900 C The values below are to be measured on separately cast test bars. Test bar diameters and solidification rates should be such that the microstructure and properties are commensurate with the manifold as supplied to the man
18、ufacturer. A1 A2 5.2.1 Tensile Properties (ASTM E 21) Ultimate Tensile 38 Mpa 200 MPa Strength, min Yield Strength 36 Mpa 150 MPa (0.2 % Offset), min Elongation, min 81 % 15 % 5.2.2 Compressive Yield 50 Mpa 150 MPa Strength (0.2 % Offset), min (ASTM E 209) 5.2.3 Shear Strength at 10 Mpa TBD 900 C, min (ASTM B 769) 5.2.4 Thermal Fatigue, Cycled Between 25 C and 900 C Cycles to Failure, min 900 TBD
