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Maraging C300 STEEL

Maraging 300 is a VIM (Vacuum Induction Melt) + VAR (Vacuum Arc Remelt), low-carbon, nickel-cobalt-molybdenum high temperature alloy capable of yield strengths in excess of 270 ksi (1862 MPa) through a simple, low temperature heat treatment. Maraging C300 exhibits good ductility at high strength levels and is readily welded.

Maraging C300 is one of a family of "Maraging" nickel steels (including Maraging C250 and C350) which are ductile in the solution treated condition and attains ultrahigh tensile strength by aging at temperatures in the range of 850/950 degrees Fahrenheit.

MasterSource offers a complete line of Maraging C300 inventory as noted below.

Alloy Specifications
C300 Maraging Hi temp Alloy
UNS K93120
Aeralloy MAR-300
Hi Temp
Hi Temp Alloy
Hi Temp Maraging 300 Alloy
Maraging C300
Maraging 300
Maraging 300 Hi Temp Alloy
NIMARK® 300™
NIMARK® Alloy 300
AMS 6514
MIL-S-46850D  TYPE 4

Custom Forms


Flat, Round, Square, Plate and sheet.

Compliance: Metals distributed by and thru MasterSource Company Inc. are in compliance with Section 1502 of the Dodd-Frank Act pertaining to conflict minerals.


NiMark® is a registered tradename of Carpenter Technology Corporation
Vascomax® is a registered trademark of Allvac, an Allegheny Technologies Company
UDIMAR® 250 is a registered trademark of Special Metals

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Supplying aviation grade metals to the DoD and Aerospace industry.
Aerospace, Defense, Marine, Nuclear and Industrial Metals.
Exotic Metals & Hard to Find Metals.