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Heat-Treatment Requirements
|
Grade
|
Temperature, min
|
|
|
°F
|
°C
|
|
|
HK30, HK40, HT30, CT15C, HG10MNN
|
as-cast
|
as-cast
|
|
CF3, CF3A, CF8, CF8A, CF3M,
|
1900
|
1040
|
|
CF3MA, CF8M, CF3MN, CG3M, CF10,
|
||
|
CF10M, CG8M
|
||
|
CF10SMnN, CF8C, CF10MC
|
1950
|
1065
|
|
CN7M, CG6MMN
|
2050
|
1120
|
|
CH8, CH10, CH20, CK20
|
2100
|
1150 |
|
CK3MCuN, CN3MNB
|
2200 | 1220 |
|
CE20NA
|
2225
|
1220 |
AGrade shall be quenched in water or the castings may be furnace cooled to 2050°F [1120°C] minimum, held for 15 min minimum and then quenched in water or rapidly cooled by other means.
BCastings of these grades shall be held at the specified temperature for a minimum of 4 hours.
Tensile Requirements
|
CF3
J92700
|
CF3A
J92700
|
CF8
J92600
|
CF8A
J92600
|
CF3M
J92800
|
CF-
3MA
J92800
|
CF8M
J92900
|
CF-
3MN
J92804
|
CF8C
J92710
|
CF10
J92950
|
CF10M
J92901
|
CH8
J93400
|
CH10
J93401
|
CH20
J93402
|
CK20
J94202
|
HG10
MNN
J92604
|
HK30
J94203
|
HK40
J94204
|
|
|
Tensile strength,
min, ksi [MPa]
Yield strength,A
min, ksi [MPa]
|
70 [485] 30 [205] |
77 [530] 35 [240] |
70 [485] 30 [205] |
77 [530] 30 [240] |
70 [485] 30 [205] |
80 [550] 37 [255] |
70 [485] 30 [205] |
75 [515] 37 [255] |
70 [485] 30 [205] |
70 [485] 30 [205] |
70 [485] 30 [205] |
65 [450] 28 [195] |
70 [485] 30 [205] |
70 [485] 30 [205] |
65 [450] 28 [195] |
76 [525] 33 [225] |
65 [450] 35 [240] |
62 [425] 35 [240] |
|
Elongation in
2 in. or
50 mm,B
min, %
|
35 | 35 | 35 | 30 | 30 | 30 | 30 | 35 | 30 | 35 | 30 | 30 | 30 | 30 | 30 | 20 | 10 | 10 |
|
|
HT30
N08030
|
CF-
10MC
|
CN7M
N08007
|
CN-
3MN
J94651
|
CG
6MMN
J93790
|
CG8M
J93000
|
CF10S-
MnN
J92972
|
CT15C
N08151
|
CK-
3MCuN
J93254
|
CE20N
J92802
|
CG3M
J92999
|
|
Tensile strength, min, ksi [MPa] Yield strength,A min, ksi [MPa] |
65 [450] 28 [195] |
70 [485] 30 [205] |
62 [425] 25 [170] |
80 [550] 38 [260] |
85 [585] 42.5 [295] |
75 [515] 35 [240] |
85 [585] 42.5 [295] |
63 [435] 25 [170] |
80 [550] 38 [260] |
80 [550] 40 [275] |
75 [515] 35 [240] |
|
Elongation in
2 in. or
50 mm,B
min, %
|
15 | 20 | 35 | 35 | 30 | 25 | 30 | 20 | 35 | 30 | 25 |
ADetermine by the 0.2 % offset method.
BWhen ICI test bars are used in tensile testing as provided for in Specification A985/A985M, the gage length to reduced section diameter ratio shall be 4 to 1.
Repair by Welding
1. Repairs shall be made using procedures and welders qualified under Practice A488/A488M.
2. Weld repairs shall be inspected to the same quality standards that are used to inspect the castings. When castings are produced with Supplementary Requirement S5 specified, weld repairs on castings that have leaked on hydrostatic test, or on castings in which the depth of any cavity prepared for repair welding exceeds 20 % of the wall thickness or 1 in. [25 mm], whichever is smaller, or on castings in which any cavity prepared for welding is greater than approximately 10 in.2 [65 cm2], shall be radiographed to the same standards that are used to inspect the castings. When castings are produced with Supplementary Requirement S6 specified, weld repairs shall be inspected by liquid penetrant examination to the same standards that are used to inspect the castings.
3. For Grade HG10MNN, the filler metal to be used shall be established by mutual agreement between the manufacturer and the purchaser.
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