Haynes® 556

Aurico Alloys LLP supplies Haynes® 556 (UNS R30556, W.Nr. 1.4883) as sheet, plate and round bar from Mumbai, India, with EN 10204 3.1 mill test certificates. It is an iron-nickel-chromium-cobalt alloy for high-temperature service in sulphidising, carburising and chlorine-bearing atmospheres, where a conventional stainless or nickel alloy would be attacked.

Key Properties

Iron base, not nickel. Chromium 22%, nickel 20% and cobalt 18% nominal on an iron balance — the 22-20-18 in its EN designation, X10CrNiCoMoN22-20-18.
Molybdenum 3% and tungsten 2.5% nominal, with tantalum 0.6% and nitrogen 0.2% nominal.
Corrosion and heat resistance in one grade. It resists sulphidising, carburising and chlorine-bearing atmospheres while keeping its strength and oxidation resistance at temperature, ground that would otherwise need two different grades.
The other iron-based Haynes grade is HR-120, which carries more nickel, 37% nominal, and caps cobalt at 3%.

Applications

Waste incineration grates and components
Chemical process equipment and fixtures in sulphidising, carburising or chlorine-bearing atmospheres
Furnace and process fixtures that need corrosion and oxidation resistance from a single grade

Available Forms

Equivalent Grades & Standards

Equivalent designations and physical constants for Haynes 556
Property	Value
UNS number	R30556
Werkstoff / EN number	1.4883
EN designation	X10CrNiCoMoN22-20-18
Density	8.23 g/cm³
Melting range	1330-1415 °C

Identifiers and physical constants for Haynes 556. A dash means no such designation is published for this grade.

Specifications by Product Form

Haynes 556 (R30556) is supplied to a different standard in each form. Quote the one that matches the product you are ordering.

Product form	Specification
Plate, sheet and strip	ASTM B435 / AMS 5874
Rod and bar	ASTM B572 / AMS 5877
Wire	AMS 5831
Pipe and tube	ASTM B619 / B622
Fittings	ASTM B366