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    2. A286 Machinability

    A286 Machinability

    In general, the high temperature alloys are more difficult to machine than stainless steels. However, the iron-base alloy group, of which alloy A286 is a member, is easier to machine than the nickel-based precipitation-hardening grades such as alloy 718 or cobalt-bearing grades such as alloy 41. Cemented Carbide Tools are preferred for Alloy A286 Machining. Similar in behavior to the machining of the austenitic (300 series) stainless steels. Cemented carbide tools are best for high cutting rates as in turning operations. Turning: Surface speed of 300-325 fpm using carbide tooling at feed rate of 0.008 inches per revolution. Water base coolant or lubricant is used for machining Alloy A286.

    Alloy A286 should be machined in the annealed condition if possible. Because of its tendency to Cold hardening, a low cutting speed should be selected. The cutting depth should be selected in such a way that a previous consolidation zone can be undercut. If possible, the Cutting tool must be constantly engaged.

    A286 exhibits similar work hardening characteristics and machinability as other austenitic stainless steels. The alloy is easier to machine in the aged or cold worked condition compared to the solution treated condition.

    Turning-Single Point and Box Tools

    Condition Depth of Cut In. High Speed Tools High Speed Tools
    Speed fpm Feed ipr Feed ipr Speed fpm Feed IPR Tool Mtl.
    Brazed Throw Away
    Solution Treated 0.1 35 0.015 M-42 135 160 0.015 C-2
    0.025 40 0.007 160 190 0.007 C-3
    Aged 0.1 30 0.01 120 140 0.01 C-2
    0.025 35 0.007 140 165 0.007 C-3

    Turning Cut-off and Form Tools

    Condition Speed fpm Feed, ipr Tool Mtl.
    Cutoff Tool Width, Inches Form Tool Width, Inches
    1/16 1/8 1/4 1/2 1 1-½ 2
    Solution Treated 25 0.002 0.004 0.005 0.003 0.002 0.002 0.001 M-42
    95 0.003 0.005 0.007 0.004 0.003 0.003 0.002 C-2
    Aged 20 0.002 0.004 0.005 0.003 0.002 0.002 0.001 M-42
    80 0.003 0.005 0.007 0.004 0.003 0.002 0.0015 C-2

    Drilling

    Condition Speed fpm Feed, ipr Tool Mtl.
    Nominal Hole Diameter, Inches
    1/16 1/8 1/4 1/2 3/4 1 1-½ 2
    Solution Treated 25 — .002 .004 .006 .008 .010 — — M-42
    Aged 20 — .002 .004 .006 .008 .008 — —

    Reaming

    Condition High Speed Tool Carbide Tool
    Speed fpm Feed Inches Per Rev Tool Mtl. Speed fpm Tool Mtl.
    Reamer Diam. Inches
    1/8 1/4 1/2 1 1-½ 2
    Solution Treated 30 .003 .006 .010 .012 .014 .016 M-42 100 C-2
    Aged 25 .003 .006 .010 .012 .014 .016 M-42 80

    Die Threading

    Condition Speed fpm Tool Mtl.
    7 or Less 8 to 15 16 to 24 25 and up T.P.I
    Annealed 4-6 5-8 6-10 8-12 M-2; M-7; M-10
    Aged 3-4 3-5 4-8 5-10 M-42

    Tapping

    Condition Speed fpm Tool Mtl.
    Solution Treated 10 M-1; M-7; M-10
    Aged 7 M-1; M-7; M-10; Nitrided

    Milling End Peripheral

    Condition Depth of Cut In. High Speed Tools Carbide Tools
    Speed fpm Feed-Inches per tooth Tool Mtl. Speed fpm Feed-Inches per tooth Tool Mtl.
    Cutter Diam. inches Cutter Diam. inches
    1/4 1/2 3/4 1-2 1/4 1/2 3/4 1-2
    Solution TreatedAged .050 3020 .002.002 .002.002 .003.003 .004.004 M-42 12080 .001.001 .002.002 .003.003 .004.004 C-2

    A286 Specifications

    Aecma Specifications
    • AECMA PrEn2171
    • AECMA PrEN2119
    • AECMA PrEN2172
    • AECMA PrEN2173
    • AECMA PrEN2174
    • AECMA PrEN2303
    • AECMA PrEN2304
    • AECMA PrEN2398
    • AECMA PrEN2399
    • AECMA PrEN3510
    • A286 AMS 5737
    • A286 AMS 5853
    • A286 AMS 5895
    • A286 AMS 5726
    • A286 AMS 5731
    • A286 AMS 5732
    • A286 AMS 5734
    • ASME SA 891 (Type 1, 2)
    • ASME SA 638 (Grade 660 Type 1, 2)
    • ASME SA 453 (Grade 660 Class A, B, C, D)
    • ASTM A891 (Type 1, 2)
    • ASTM A638 (Grade 660 Type 1, 2)
    • ASTM A453 (Grade 660 Class A, B, C, D)
    • BS HR 51
    • BS HR 52
    • X5NiCrTi26-15
    • X4NiCrTi25-15
    • X6NiCrTiMoVB25-15-2
    • GE C50TF78
    • GE C50TF27
    • GE C50TF20
    • GE B50T1181C
    • UNS S66286
    • SAE J467-A286
    • SPS M-118
    • Fairchild MS 301
    • 314 Elliott Turbine MS 618 Weatherford WS-881
    • Cameron MS-003030
    • EN 2399
    • PWA-LCS
    • GE-S400/1000
    • RR SABRe Edition 2
    • EN 1.4944
    • EN 1.4943
    • EN 1.4980
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