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A 395/A 395M-99 for Ductile Iron Castings
Standard
Specification for Ferrite Ductile
Iron Pressure-Retaining Castings for Use at Elevated
Temperatures.
1. Scope
This
specification covers ductile iron castings for pressure-retaining
parts for use at elevated temperatures. Castings of all grades are
suitable for use up to 450 Fahrenheit. For temperatures above 450
Fahrenheit and up to 650 Fahrenheit, only Grade 60-40-18 castings
are suitable (Note 1).
Valves, flanges,
pipe fittings, pumps, and other piping components are generally
manufactured in advance and supplied from stock by the manufacturer,
jobber, or dealer.
Table 1
Mechanical property requirements
|
Property |
Grade
60-40-18 |
Grade
65-45-15 |
|
Tensile
strength minimum, psi [MPa] |
60
000[415] |
65
000[450] |
|
Yield
strength minimum, psi [MPa] |
40
000[275] |
45
000[310] |
|
Elongation in 2 in, minimum, % |
18 |
15 |
|
Hardness
HB, 3000 kgf Load |
143-187 |
156-201 |
2. Chemical
requirements
The casting shall
conform to the following, requirements for chemical composition
(Note 2):
|
Total
carbon, min, % |
3.00 |
|
Silicon,
max, % |
2.50 |
|
Phosphorus, max, % |
0.08 |
3 Workmanship
and finish
The surface of
the casting shall be examined visually and shall be free from
adhering sand, scale, cracks, and hot tears. Any other surface
discontinuities shall meet visual acceptance standards specified in
the order.
4. Repair
Castings for
valves, flanges, pipe fittings, pumps, and other piping components
ordered under applicable ANSI standards shall not be repaired by
plugging, welding, brazing, or impregnation.
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