Steel Grades
B72M is a high-strength precipitation-hardened alloy built for structural endurance in aerospace, medical, and heavy engineering applications.
Ideal for aerospace fasteners, airframes, surgical tools, and defense-grade components-delivered in ready-to-process ingot form.
Air-melted from virgin elements with inert argon shielding—ensuring controlled chemistry and structural consistency.
Alloy chemistry and ingot specifications are finalized as per application requirements.
PML produces T-400 alloy ingots by melting virgin elements using an air melting furnace with argon gas purging. The process ensures high-quality, contamination-free output.
As per customer requirement mould design carried out and planned for charge preparation, charge sequences in Air induction melting furnaces in a controlled atmosphere. Careful selection of raw materials are the prime factor to achieve specified chemistry of an alloy.
Furnace Preparation: Thorough cleaning to eliminate impurities; Sequential Charging: Temperature-controlled material feed; Continuous Stirring: Homogeneous alloying; Superheating: To ensure full dissolution of elements; Filtering: Removes intermediate impurities prior to pouring using ceramic filter; Preheated Moulds: Prevents casting defects and improves ingot quality Controlled Cooling: In pre-designed metal molds
The melt is prepared under Air induction melting furnaces in a controlled atmosphere. Argon gas purging from hood and bottom ensures to minimize gas impurities.
Post-casting processes include surface treatment, cropping, and preparation of ingots for downstream processing.
Every batch is tested for chemical composition by Spark- OES / wet analysis / Gas analysis, and physical compliance as per customer specification before secure packaging.
From intricate sensor seals to ruggedized high-pressure feedthroughs, rely on our B72M alloy for the thermal stability and hermetic reliability your mission-critical hardware demands.
Chemical Composition
Typical composition for PML B72M Alloy:
| Elements | Range (Min -Max%) | ||
|---|---|---|---|
| Min | Max | PML composition | |
| Carbon | 0.00 | 0.10 | <0.10 |
| Silicon | 0.00 | 0.25 | <0.25 |
| Manganese | 72.0 nom | 72.00 | |
| Chromium | 0.00 | 0.25 | <0.25 |
| Phosphorous | 0.00 | 0.03 | <0.03 |
| Sulphur | 0.00 | 0.03 | <0.03 |
| Nickel | 10.00 nom | 10.00 | |
| Copper | 18.00 nom | 18.00 | |
| Iron | 0.00 | 1.00 | <1.00 |
| Alloy | Mechanical properties* | PML B72M Alloy as cast* | PML B72M Alloy Heat treated* |
|---|---|---|---|
| PML B72M Alloy *Typical | Rockwell Hardness (HRC) | 35 - 45 | - |
| Tensile Strength Ultimate (UTS) | 1100-1310MPa | - | |
| Tensile Strength Yield (YS) | 860MPa | - | |
| Elongation of Break | - | - | |
| Reduction of Area | - | - |
Input: Batch Sizes from 100 kg to 250 kg Output: Custom ingots as per customer drawings or mold preferences
| Input : Batch size | Output | Alloying Elements | Chemistry tolerance | Impurities Max |
|---|---|---|---|---|
| 100 kgs to 250 Kgs | Ingot of required shape as per customers requirement | Cu, Ni, Mn | +/- 0.5 % for Higher level % (Above 2 digit) and +/- 0.3 % for lower level % (Single digit) | Oxygen < 300 ppm Hydrogen < 100 ppm Nitrogen<200 ppm All other impurities < 100 ppm |
Used in industries that demand high mechanical strength and corrosion resistance:
1
Airframes, landing gear, engine components
2
High-performance bolts, nuts, and washers
3
Tools requiring sterility and mechanical precision
4
High-strength parts for harsh environments
5
Withstanding corrosion and high pressure
6
Load-bearing components with heat-treated resilience
With over 65 years of manufacturing excellence, PML delivers B72M ALLOY trusted by OEMs and Tier 1 suppliers across sectors demanding robust performance.
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)
B72M is a precipitation-hardened stainless steel alloy with balanced strength, corrosion resistance, and heat-treatable properties—ideal for high-stress environments.
Pioneering cutting-edge technology to develop reliable, high-performance magnetic components and engineering solutions.
