Prashaant Steel & Alloys

A nickel-iron-cobalt alloy with additions of niobium, titanium and aluminum for precipitation hardening. The alloy combines high strength with a low and constant coefficient of thermal expansion at temperatures to about 800°F (430°C). It also has a constant modulus of elasticity and is highly resistant to thermal fatigue and thermal shock. Used in gas turbines for rings and casings.

STANDARD PRODUCT FORMS
Sheet, plate, rod, bar and forging stock.

MAJOR SPECIFICATIONS
UNS N19903

LIMITING CHEMICAL COMPOSITION, %
Ni.......36.0 – 40.0
Fe.......Remainder
Co...... 13.0 – 17.0
Al.......0.30 – 1.15
Ti.......1.00 – 1.85
Nb.....2.40 – 3.50

PHYSICAL CONSTANTS AND THERMAL PROPERTIES
Density,Ib/in3.........................................................................0.298
g/cm3.........................................................................8.25
Melting Range,°F....................................................2405– 2539
°C....................................................1318 – 1393
Specific Heat,Btu/lb•°F.....................................................0.105
J/kg•°C............................................................442
Curie Temperature,°F................................................780 –880
°C................................................415 –470
Coefficient of Expansion, 77 – 800°F, 10-6in/in •°F........4.0
25 – 427°C, μm/m •°C............. 7.2
Thermal Conductivity, Btu •in/ft2•h•°F............................ 116
W/m •°C........................................... 16.7
Electrical Resistivity, ohm •circmil/ft................................ 379
μΩ•m...............................................0.650
TYPICAL MECHANICAL PROPERTIES

A nickel-iron-chromium alloy with additions of copper and molybdenum. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion. The alloy has excellent resistance to general corrosion, pitting and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric and nitric acids. Used for tanks, piping, heat exchangers, pumps, valves and other process equipment.

STANDARD PRODUCT FORMS
Pipe, tube, sheet, strip, plate, round bar, flat bar, forgingstock, hexagon and wire.

MAJOR SPECIFICATIONS
UNS N08020
ASTM A 240, A 480, B 366,
B 462 – 464, B 468,
B 471 – B 475, B 729, B 751,
B 775, B 829, B 906
DIN 17744, 17750-17754
ASME SA-240, SA-480, SB-366,
SB-462 – SB-464,
SB-468, SB-471 – SB-475,
SB-729, SB-751, SB-775,
SB-829, SB-906
ISO 6207, 6208, 9723 – 9725

LIMITING CHEMICAL COMPOSITION, %
Ni ......32.0 – 38.0
Fe.......Remainder
Cr......19.0 – 21.0
Cu..........3.0 – 4.0
Nb+Ta.... 8xC-1.0
Mo..........2.0 – 3.0
Nb.......... 1.0 max.
C...........0.07 max.
Mn.......... 2.0 max.
P......... 0.045 max.
S........ 0.035 max.
Si............ 1.0 max.

PHYSICAL CONSTANTS AND THERMAL PROPERTIES
Density,Ib/in3.........................................................................0.292
g/cm3.........................................................................8.08
Specific Heat,Btu/lb•°F.......................................................0.12
J/kg•°C............................................................500
Coefficient of Expansion, 77 – 212°F, 10-6in/in •°F........8.2
25 – 100°C, μm/m •°C.......... 14.7
Thermal Conductivity, Btu •in/ft2•h•°F...............................85
W/m •°C........................................... 12.3
Electrical Resistivity, ohm •circmil/ft................................ 651
μΩ•m.................................................1.08
TYPICAL MECHANICAL PROPERTIES