1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 09 23 Revised Updated and renumbered 1992 11 25 C10261076 Released w. Jones EAO J.C. Webster NAAO Printed copies are uncontrolled Page 1 of 5 Copyright 2002, Ford Global Technologies, Inc. STEEL, AUSTEN
2、ITIC VALVE WROUGHT WSD-M1A313-A1 WSD-M1A313-A2 WSD-M1A313-A3 WSD-M1A313-A4 WSD-M1A313-A5 1. SCOPE The materials defined by this specification are a series of wrought chromium-manganese austenitic steels which develop optimum physical properties by appropriate solution and aging treatments. Controlle
3、d forging and/or stress relieving processing may also be applicable in limited instances. 2. APPLICATION These specifications were released originally for material used for the heads of two piece exhaust valves for reciprocating engines. These materials may also be employed in one piece valve design
4、s where appropriate consideration is given to tip, stem and seat wear properties. Under normal conditions and with appropriate approval (para 3.7) a lower graded material may be substituted by an alternative (see 4.2). 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppl
5、iers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). ENGINEERING MATERIAL SPECIFICATION WSD-M1A313-A1/A5 Page 2 of 5 Copyright 2002, Ford Global Technologies, Inc. 3.2 CHEMICAL COMPOSITION (WEIGHT %) A1 A2 A3 Carbon * 0.65 - 0.75 0.50
6、- 0.60 0.47 - 0.58 Manganese 5.5 - 6.9 7.0 - 10.00 7.00 - 10.00 Phosphorus 0.04 max 0.05 max 0.05 max Sulphur 0.04 max 0.09 max 0.09 max Silicon 0.45 - 0.85 0.25 max 0.25 max Chromium 20.50 - 22.00 19.50 - 21.50 20.00 - 22.00 Nickel 1.4 - 1.9 1.50 - 2.80 3.25 - 4.50 Nitrogen * 0.18 - 0.28 0.20 - 0.4
7、0 0.38 - 0.50 Tungsten - - - Niobium+Tantalum - - - Molybdenum - - - *Carbon + Nitrogen - - 0.90 min Iron Remainder Remainder Remainder A4 A5 Carbon * 0.48 - 0.58 0.45 - 0.56 Manganese 8.00 - 10.00 8.00 - 10.00 Phosphorus 0.04 max 0.05 max Sulphur 0.035 max 0.03 max Silicon 0.45 max 0.45 max Chromiu
8、m 20.00 - 22.00 20.00 - 22.00 Nickel 3.25 - 4.50 3.5 - 5.0 Nitrogen * 0.38 - 0.50 0.40 - 0.60 Tungsten - 0.8 - 1.5 Niobium+Tantalum 2.00 - 3.00 1.8 - 2.5 Molybdenum - - *Carbon+Nitrogen 0.90 min 0.90 min Iron Remainder Remainder Minor variations to the above composition will be permitted providing a
9、ll other specification and performance criteria are met and the composition is approved at control plan stage. See Para 4.1 for alternative national specifications, where available. 3.3 HEAT TREATMENT High temperature strength, fatigue and corrosion properties are dependent on heat treatment tempera
10、tures and process duration. The supplier must select the best heat treatment compromise for particular component performance. NOTE: Actual times and temperature may be adjusted to meet hardness and microstructural requirements and will be agreed at inception of the control plan. ENGINEERING MATERIAL
11、 SPECIFICATION WSD-M1A313-A1/A5 Page 3 of 5 Copyright 2002, Ford Global Technologies, Inc. 3.3.1 Solution and Age Treatment Parts made from these materials shall be solution treated by heating to above the carbo-nitride solvus temperature and then liquid quenched at a rate sufficient to inhibit carb
12、ide formation. Typical solution treatment is 1165 - 1200 C (dependent on grade) for 30 - 60 minutes at temperature. Following solution treatment, the parts shall be reheated at a temperature and for a time that will precipitation harden the material. Typical temperature is 760 - 815 C (dependent on
13、grade) and time, 2 to 16 hours. 3.3.2 Forge and Stress Relief Treatment - WSD-M1A313-A4 This grade may be supplied as forged from pretreated (water quenched from 1040 - 1080 C) material or forged and stress relieved (at 750 C). Requirements para 3.4 and 3.5 hardness and microstructure still apply. 3
14、.4 PART HARDNESS (Unless location and requirements otherwise specified on Engineering Drawing) (ISO 6507/1) Valve Head, min HV 272 Valve head hardness shall be measured at a position on the stem centre line at the mid-head section. 3.5 MICROSTRUCTURE At the valve head location identified in 3.4 the
15、microstructure shall be essentially equiaxed austenitic grains with generally well dispersed carbides, some tendency to banding is permitted. Grain boundary forms shall be discrete and discontinuous. For extruded valves, the preferred grain size is ASTM E 112, 3-6 with some size 2, 7 and 8 permitted
16、. For upset forged valves the grain size shall be sizes 7 and 8 predominantly. Grain size at or near surface may be modified locally by forging effects and shall not form part of grain size control. (ASTM E 112 intercept method shall be definitive grain size determination procedure). 3.6 CLEANLINESS
17、 (ASTM A 295 and ASTM E 45, Plate III, Method A) Valve steel shall meet the minimum cleanliness requirements when tested in accordance with the above specifications. A B C D Thin Heavy Thin Heavy Thin Heavy Thin Heavy 2.5 2.0 2.0 2.0 2.0 2.0 2.0 2.0 ENGINEERING MATERIAL SPECIFICATION WSD-M1A313-A1/A
18、5 Page 4 of 5 Copyright 2002, Ford Global Technologies, Inc. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. 4.1 GRADE EQUIVALENTS A1 A2 A3 A4 A5 Type 21-2N 21-2N 21-4N 21-42 21-43 SAE - EV12 EV8 - -
19、 BS970 - - 349S52 352S52 - DIN 17006 X70CrMnNi X55CrMn X53Cr X50CrMn - N216 NiN208 MnNiN219 NiNbN219 Werstoff Nr. 1.4881 1.4875 1.4871 1.4882 ISO 683XV Type 10 - Type 9 - - 4.2 MINIMUM PHYSICAL/MECHANICAL PROPERTIES (Properties quoted from literature to be taken as guide only) A1 A2 A3 A4 A5 Heat Tr
20、eatment - ST.P ST.P ST.P or F ST.P Density: g/cm3 - 7.75 7.8 7.8 7.9 Thermal Expansion 20-800 C x 10E-6 18.5 18.4 18.5 18.8 - Thermal Conductivity W/cm/k - 0.147 0.145 0.145 0.145 Room Temperature Properties U.T.S, MPa - 900 950 950 950 0.2 % Proof, MPa - 550 580 580 580 Elongation: % (GL) - - 8 12
21、12 Properties at 750 C U.T.S - 360 370 390 410 0.2 % Proof, MPa - 200 230 235 240 Elongation: % (GL) - - 30 - 25 Properties at 850 C U.T.S * * * 280 280 0.2 % Proof, MPa * * * 180 180 Elongation: % (GL) * * * - 35 ENGINEERING MATERIAL SPECIFICATION WSD-M1A313-A1/A5 Page 5 of 5 Copyright 2002, Ford Global Technologies, Inc. These materials are not normally used above engine temperatures of 850 C. Key ST - Solution treated P - Precipitation hardened (aged) GL - Length 5 times original test piece diameter F - Forged and stress relieved
