Chemical Composition Base Element Fe (Iron) Al (Aluminum) 0.15 to 0.3 % B (Boron) 0.003 % C (Carbon) 0.03 % (maximum) Fe (Iron) 77.5 to 79 % (estimate) Nb (Niobium) 0.5 % Ni (Nickel) 19 to 20 % Ti (Titanium) 1.3 to 1.6 % Zr (Zirconium) 0.02 % Balance Fe (Iron) Composition Note Fe is listed as a Balance element for this material, but its % value is not listed in the specification. The value shown is a calculated one. Mechanical Properties Yield Strength 1680 to 1790 MPa Ultimate Tensile Strength 1740 to 1830 MPa Elongation 10 to 13 % strain Rockwell Hardness C scale 49 to 53 Other Information Material Class Ferrous Alloy Country USA Description Heat treated: 253,000-265,500 TS; 244,000-260,000 YS; 10-13 El; 52-59 RA; 49-53 HRC; For rocket motor cases, airframes, airborne equipment, large machinery parts, bolts, cryogenic and high temperature equipment. Maraging steel, shock resistant. Designation ALMAR 20 Specification Type Manufacturer's Specification Specification Status Obsolete Source Woldman's Engineering Alloys 9th ed. J. Frick Editor, ASM International 2000 Available forms Wrought Similar Alloys Click here to find similar alloys Links Organizations AL Tech Specialty Steel Corp.
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Chemical Composition

Fe (Iron)

0.15 to 0.3

B (Boron)

0.003

C (Carbon)

0.03

% (maximum)

Fe (Iron)

77.5 to 79

% (estimate)

Nb (Niobium)

0.5

Ni (Nickel)

19 to 20

Ti (Titanium)

1.3 to 1.6

Zr (Zirconium)

0.02

Balance

Fe (Iron)

Composition Note

Fe is listed as a Balance element for this material, but its % value is not listed in the specification. The value shown is a calculated one.

Mechanical Properties

Yield Strength

1680 to 1790

MPa

Ultimate Tensile Strength

1740 to 1830

MPa

Elongation

10 to 13

% strain

Rockwell Hardness C scale

49 to 53

Other Information

Material Class

Ferrous Alloy

Country

USA

Description

Heat treated: 253,000-265,500 TS; 244,000-260,000 YS; 10-13 El; 52-59 RA; 49-53 HRC; For rocket motor cases, airframes, airborne equipment, large machinery parts, bolts, cryogenic and high temperature equipment. Maraging steel, shock resistant.

Designation

ALMAR 20

Specification Type

Manufacturer's Specification

Specification Status

Obsolete

Source

Woldman's Engineering Alloys 9th ed. J. Frick Editor, ASM International 2000

Available forms

Wrought

Similar Alloys

Click here to find similar alloys

Links

Organizations

AL Tech Specialty Steel Corp.

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