Alloy 330 (UNS N08330 / W.Nr. 1.4886)

Alloy 330 (UNS N08330 / W.Nr. 1.4886) is an austenitic nickel-iron-chromium alloy developed to provide excellent resistance to carburizing and oxidizing atmospheres at elevated temperatures. With a nickel content of 34 to 37 percent, the alloy remains highly resistant to both chloride stress corrosion cracking and embrittlement from the precipitation of sigma phase. The alloy is used extensively in elevated temperatures where resistance to the combined effects of thermal cycling and carburization is required.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Nicrofer 3718 Incoloy alloy 330 RA 330	–	–	Alloy 330	N08330	–	1.4886 1.4864	–	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Fe
Alloy 330	≤0.08	0.75-1.50	≤2.00	≤0.030	≤0.030	17.0-20.0	34.0-37.0	Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRB
8.08	1380-1420	552-586	207-296	40-45	70-85

Available Products and Specifications

Rod, Bar, Wire and Forgings	ASTM B511, ASTM B512, ASME SB511, ASME SB512
Plate, Sheet and Strip	ASTM B536, ASME SB536
Pipe and Tube	ASTM B535, ASTM B546, ASTM B710, ASTM B739, ASTM B829, ASME SB535, ASME SB546, ASME SB710, ASME SB829
Welding Product	–
Others	ASTM B366, ASME SB366

Features

Alloy 330 provides a high level of corrosion resistance, particularly to oxidation, carburization, and nitridation. In aqueous environments the chromium content of 330 provides resistance to oxidizing conditions, while the nickel content enhances resistance to reducing conditions. The alloy’s high nickel content also makes it highly resistant to chloride stress corrosion cracking and sigma phase embrittlement.
Alloy 330 has good oxidation resistance and resists scale formation up to about 2000°F (1095°C). Any scale which is formed is tightly adherent, particularly under cyclic conditions of heating and cooling.
The alloy’s 35 percent nickel content and silicon addition contribute greatly to its excellent resistance to carburization. In alternating carburizing and oxidizing atmospheres, Alloy 330 exhibits excellent resistance to the ‘green rot’ phenomenon.
Alloy 330 exhibits good resistance to nitrogen-containing atmospheres where the oxygen content is low. It is used extensively in components handling cracked ammonia.