Alloy 28 (UNS N08028 / W.Nr. 1.4563)

Alloy 28 (UNS N08028 / W.Nr. 1.4563) is a highly corrosion-resistant austenitic alloy offering resistance to a variety of media. The alloy resists attack in reducing media, due to its contents of nickel, copper and molybdenum; and resistant to oxidizing species due to its high level of chromium. Alloy 28 offers resistance to general, localized and stress-induced corrosion by chlorides and hydrogen sulfides. Thus, it is widely used in oilfield applications. Tubes are cold worked to high levels of strength for downhole service in deep sour gas wells. With its excellent combination of strength and corrosion resistance, Alloy 28 also finds applications in the process industries. It is especially useful for handling phosphoric acid. Due to its resistance to chlorides, Alloy 28 tubes may be used in the marine industry for seawater-cooled heat exchangers.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Sanicro 28 Incoloy alloy 28 Nicrofer 3127 LC	00Cr27Ni31Mo3Cu	–	Alloy 28	N08028	X1NiCrMoCuN 31-27-4	1.4563	Z1NCDU31-27-03	X1NiCrMoCu 31-27-4	–	2584

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Mo	Cu	Fe
Alloy 28	≤0.03	≤1.00	≤2.50	≤0.030	≤0.030	26.0-28.0	30.0-34.0	3.0-4.0	0.6-1.4	Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRB
8.00	1405-1425	500	214	40	70/90

Available Products and Specifications

Rod, Bar, Wire and Forgings	EN 10088-3, EN10272
Plate, Sheet and Strip	ASTM B709, EN 10088-2
Pipe and Tube	ASTM B668, ASTM B829, ASME SB668, ASME SB709, ASME SB829
Welding Product	–
Others	ASTM A403, ASTM B668

Features

Very high corrosion resistance in strong acids
Very good resistance to stress corrosion cracking (SCC) and intergranular corrosion in various environments
High resistance to pitting and crevice corrosion
Good weldability