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% | ||
|---|---|---|---|
| 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 |
Benefits:
1
Flexible batch sizes
2
Consistent, reproducible high quality
3
Minimal gas impurity levels
4
Evaporation of volatile non-ferrous impurities (Sn, Zn, Pb, Sb)
5
Reduced non-metallic inclusions
6
Ready-to-use ingots for powder metallurgy, strip production, rolling, forging, etc.
Applications
1
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.
2
ASTM F1537
Used in load-bearing orthopedic implants, aerospace, and precision engineering sectors requiring strength, ductility, and corrosion resistance.
3
Vitallium
Suitable for dental and orthopedic implants with high fatigue and wear resistance.
Trust, Reliability & Quality
With over six decades of expertise, PML delivers high-performance component technologies and precision solutions trusted across critical industries.
ISO 45001
Occupational Health and Safety (OH&S) management systems
ISO 14001
Environmental Management Systems (EMS)
ISO 9001
Quality Management Systems (QMS)
IATF 16949
International Standard for Automotive Management Systems
AS 9100
Aerospace Quality Management System (QMS)
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