Alloy 20 (UNS N08020 / W.Nr. 2.4660)

Alloy 20 (UNS N08020 / W.Nr. 2.4660) is a nickel iron chromium alloy with additions of copper and molybdenum. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion. This alloy has excellent resistance to general corrosion, pitting and crevice corrosion in chemical containing chlorides and sulfuric, phosphoric and nitric acids. Used for tanks, piping, heat exchangers, pumps, valves and other process equipment.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Carpenter 20Cb-3 Incoloy alloy 20 Nicrofer 3620 Nb	GH1015 NS1403 NS143	ХН28ВМАБ	Alloy 20	N08020	NiCr20CuMo	2.4660	–	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Mo	Cu	Nb+Ta	Fe
Alloy 20	≤0.07	≤1.0	≤2.0	≤0.045	≤0.035	19.0-21.0	32.0-38.0	2.0-3.0	3.0-4.0	8*C-1.0	Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRC
8.08	1380-1420	620	300	40	/

Available Products and Specifications

Rod, Bar, Wire and Forgings	ASTM B462, ASTM B472, ASTM B473, ASME SB472, ASME SB473, ISO 9723, ISO 9724, ISO 9725, DIN 17752-17754
Plate, Sheet and Strip	ASTM A240, ASTM A480, ASTM B463, ASTM B906, ASME SA240, ASME SA480, ASME SB463, ASME SB906, ISO 6208, DIN 17750
Pipe and Tube	ASTM B729, ASTM B829, ASTM B468, ASTM B751, ASTM B464, ASTM B775, ASTM B474, ASME SB729, ASME SB829, ASME SB468, ASME SB751, ASME SB464, ASME SB775, ASME SB474, ISO 6207, DIN 77751
Welding Product	–
Others	DIN 17744, ASTM B366, ASTM B462, ASTM B471, ASTM B475, ASME SB366, ASME SB462, ASME SB471, ASME SB475