Maraging 300 (UNS K93120)

Maraging 300 (UNS K93120) is an 18% nickel, cobalt strengthened steel (C-type) with excellent properties, workability and heat treatment characteristics. Maraging material is supplied in the annealed and descaled condition. The alloy is very tough, relatively soft (RC 30/35), readily machined or formed. Maraging provides a high value for critical parts in aerospace, structural, component and tooling applications.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Maraging 300 C300	–	–	–	K93120	–	–	–	–	–	–

Chemical Composition, %

Alloy

Maraging 300

≤0.03

≤0.10

≤0.01

≤0.50

18.0-19.0

8.5-9.5

4.6-5.2

0.05-0.15

0.5-0.8

≤0.50

Bal

Typical Physical and Mechanical Properties (RT, Annealed+Aged)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRB
8.0	1350-1450	2035	2000	12	/

Available Products and Specifications

Rod, Bar, Wire and Forgings	ASTM A 538, AMS 6514
Plate, Sheet and Strip	–
Pipe and Tube	–
Welding Product	–
Others	–

Features

Maraging 300 is a nickel/cobalt steel alloy that is essentially carbon-free, other alloying elements include moly, aluminum and titanium. This combination creates a superior maraging steel that maintains numerous beneficial features, including: