Special Alloys

CrCoMo Alloys

Premium Cobalt-Chromium-Molybdenum alloys from PML-engineered for strength, wear resistance, and biocompatibility in critical medical and high-temperature applications.

The Unyielding Fusion of Biological Purity and Industrial Might

A high-integrity superalloy engineered to survive the most punishing friction and corrosive environments on Earth, and inside the human body.

Ingot Manufacturing Process

Vacuum Induction Melting (VIM) process ensures high-purity CoCrMo ingots with precise alloy control and minimal contamination.

RFQ from Customer

Alloy development begins with customer requirements—tailoring chemistry, trace elements, and melt parameters for target specifications, dimensional requirement

Alloy Design/Planning

As per customer requirements, mould design carried out and planned for charge preparation, charge sequences in VIM furnace. Careful selection of raw materials are the prime factor to achieve specified chemistry of an alloy.

Alloy Melting by VIM

Virgin elements are charged into the VIM furnace either in air or under vacuum, with precise adjustments made for trace element additions during melting.

Process & Quality Control

The melt is poured under vacuum into precision-engineered molds using an automatic tilting mechanism for defect-free solidification.

Primary Finishing

Post-casting processes include surface treatment, cropping, and preparation of ingots for downstream processing.

Testing & Packaging

Every batch is tested for chemical composition by Spark- OES / wet analysis / Gas analysis, and physical compliance as per customer specification before secure packaging.

Technical Specifications

Standards Referenced: ASTM F75, ASTM F1537, SAE AMS 5387

Element	Chemical Composition in wt%
Element	Vitallium	ASTM F75	ASTM F1537
C	0.05 Max	0.35 Max	0.15 - 0.35
Cr	26.00 - 30.00	27.00 - 30.00	26.00 - 30.00
W	-	0.2 Max	0.2 Max
Si	1.00 Max	1.00 Max	1.00 Max
Fe	0.75 Max	0.75 Max	0.75 Max
Ni	1.00 Max	0.50 Max	1.00 Max
Mn	1.00 Max	1.00 Max	1.00 Max
Mo	5.00- 7.00	5.00- 7.00	5.00- 7.00
P	Other impurities 0.1 Max	0.02 Max	0.02 Max
S		0.01 Max	0.01 Max
Al		0.10 Max	1.00 Max
Ti		0.10 Max	0.10 Max
B		0.01 Max	0.01 Max
La		-	0.03 - 0.20
Co	Balance	Balance	Balance

Product Variants & Mechanical Properties

ASTM F75 (Cast Alloy)

Alloy	Mechanical properties*	PML alloy: as cast*	After Heat treatment*
PML ASTM F75 *Typical	Rockwell Hardness (HRC)	47 HRC	34 HRC
	Tensile Strength Ultimate (UTS)	665MPa Min	960 MPa
	Tensile Strength Yield (YS)	450MPa Min	560 MPa
	Elongation Break	8%	20%
	Reduction of Area	-	-

ASTM F1537 (Wrought Alloy)

Ensuring material integrity with 100% PMI testing via our precise XRF analyser.

Alloy	Mechanical properties*	PML alloy: as cast*	After Heat treatment*
PML ASTM F1537 *Typical	Rockwell Hardness (HRC)	25	25-35
	Tensile Strength Ultimate (UTS)	860MPa	897MPa Min
	Tensile Strength Yield (YS)	-	517MPa Min
	Young’s Modulus (E)	-	-
	Elongation Break	-	20%
	Reduction of Area	-	-

*Typical- Mechanical properties vary according to heat treatment cycle.

Technical Specifications

Vitallium (Cast Alloy)

Engineered to meet demanding specs with consistent quality and adaptable performance.

Alloy	Mechanical properties*	PML alloy: as cast*	After Heat treatment*
PML Vitallium *Typical	Rockwell Hardness (HRC)	47 HRC	34 HRC
	Tensile Strength Ultimate (UTS)	-	869 MPa
	Tensile Strength Yield (YS)	-	644 MPa
	Young’s Modulus (E)	-	218 GPa
	Elongation Break	Not Applicable	12% Min
	Reduction of Area	Not Applicable	12% Min

The Ultimate Shield for High-Load Environments

Engineered for extreme biocompatibility and wear resistance, this high-performance cobalt-chromium-molybdenum alloy provides the exceptional fatigue strength and corrosion defense required for advanced medical implants and aerospace engine components.

Process capability :

Key features

Input : Batch size	Output	Alloying Elements	Chemistry tolerance	Impurities Max
30 kgs to 600 kgs	Ingot of required shape as per customers requirement	Cr and W on Co- base	+/- 0.5 % for Higher level % (Above 2 digit) and +/- 0.3 % for lower level % (Single digit)	Oxygen < 25ppm Hydrogen < 3ppm Nitrogen < 50ppm All other impurities < 50 ppm

Input : Batch size

Output

Alloying
Elements

Chemistry tolerance

Impurities Max

30 kgs to 600 kgs

Ingot of
required
shape as per
customers requirement

Cr and W on Co- base

+/- 0.5 % for Higher
level % (Above 2
digit) and
+/- 0.3 % for lower
level % (Single digit)

Oxygen < 25ppm

Hydrogen < 3ppm

Nitrogen < 50ppm

All other impurities < 50 ppm

Benefits:

Flexible batch sizes

Consistent, reproducible high quality

Minimal gas impurity levels

Evaporation of volatile non-ferrous impurities (Sn, Zn, Pb, Sb)

Reduced non-metallic inclusions

Ready-to-use ingots for powder metallurgy, strip production, rolling, forging, etc.

Applications

ASTM F75

Ideal for rapid prototyping, powder manufacturing via VIGA, and precision investment castings, Medical applications Orthopedic Implants (hip, knee, spinal), Dental Prosthetics, Cardiovascular Implants, Aerospace bearings and wear parts, Precision watch components.