High-temperature Alloy Fabrication

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HAYNES® 556® alloy Universal High-temperature Alloy Welding Material

Universal High-Temperature Filler Metal for Welding Dissimilar High-Temperature Alloys

Learn to rely on only one weld rod for your high-temperature dissimilar welding needs – 556® weld rod. The HAYNES® 556® alloy displays excellent welding characteristics along with outstanding all-weld-metal (AWM) strength and corrosion resistance making it a “universal” filler metal for high-temperature dissimilar metal welding. The 556® filler metal typically possesses better high-temperature strength and corrosion resistance than the base metals being welded (i.e. performance might be limited by base metal properties instead of weld metal properties).

Possible Combinations

Ni-base to Fe-base

Fe-base to Fe-base

Co-base to Fe-base

Stainless Steel to C-steel

Stainless Steel to Fe-base

Stainless Steel to Co-base

Stainless Steel to Ni-base

C-steel to Fe-base

C-steel to Ni-base

Weld Wire Sizes (Standard)

Cut Lengths – 0.062, 0.094, 0.125 (in)

Layer Wound – 0.035, 0.045, 0.062 (in)

Specifications

AMS 5874 (sheet, plate and strip)

AMS 5831 (wire)

AMS 5877 (bars, forgings, and rings)

ASTM B435 (sheet and plate)

ASTM B622 (seamless pipe and tube)

ASTM B626 (welded tubes)

ASME Code Case No. 2010 Sec. 1

(sheet, plate, bar, pipe, and tube)

Nominal Composition (weight %)

Iron Balance
Cobalt 18
Chromium 22
Molybdenum 3
Tungsten 2.5
Nickel 20
Tantalum 0.6
Nitrogen 0.20
Silicon 0.4
Manganese 1
Aluminum 0.2
Carbon 0.10
Lanthanum 0.02
Zirconium 0.02

All-Weld Metal Rupture Properties

Temperature Rupture Properties: Stress Required to Produce Rupture in:
– 100 h 1,000 h 10,000 (Est.)
°F °C ksi MPa ksi MPa ksi MPa
1400 760 28.0 193 23 159 19 131
1600 870 16.0 110 11.5 79 8.5 59

Thermal Stability

Room Temperature Tensile Properties of GTAW All-Weld Metal Following 1000 h Thermal Exposures*
Exposed Temperature 0.2 % Yield Strength Ultimate Tensile Strength Elongation in 1.25 in
°F °C ksi MPa ksi MPa %
As-Welded 70 483 110 758 36
1200 650 72 496 117 807 24
1400 760 72 496 109 752 18
1600 870 59 407 109 752 23

Typical Room Temperature Physical Properties

Physical Property British Units Metric Units
Density
0.297 lb/in3
8.23 g/cm3
Electrical Resistivity 37.5 µohm-in 95.2 µohm-cm
Dynamic Modulus of Elasticity
29.7 x 106 psi
 206 GPa
Thermal Conductivity
77 Btu-in/ft2-h-°F
 11.1 W/m-°C
Specific Heat 0.111 Btu/lb-°F 464 J/kg-°C

Environmental Resistance

Oxidation in Air – Excellent at 2000°F (1095°C)

Chlorination – Very good to 1650°F (900°C)

Sulfidation – Second only to Co-base alloys

Molten Zinc – Best Available

Molten Chloride Salts – Equal to alloy X