Steel Grades
B72M Alloy
B72M is a high-strength precipitation-hardened alloy built for structural endurance in aerospace, medical, and heavy engineering applications.
Engineered for optimal strength-to-weight performance, corrosion resistance, and thermal stability.
Ideal for aerospace fasteners, airframes, surgical tools, and defense-grade components-delivered in ready-to-process ingot form.
Ingot Manufacturing Process
Air-melted from virgin elements with inert argon shielding—ensuring controlled chemistry and structural consistency.
RFQ from Customer
Alloy chemistry and ingot specifications are finalized as per application requirements.
Ingot Production
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.
Alloy Design/Planning
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.
Alloy Melting by AIM
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
Process & Quality Control
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.
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.
The Definite Choice for Precision-Matched Expansion Alloys
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
Technical Specifications
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 |
Properties
| 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 | - | - |
Process Capability
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 |
Applications
Used in industries that demand high mechanical strength and corrosion resistance:
1
Aerospace Structural Parts
Airframes, landing gear, engine components
2
Aerospace Fasteners
High-performance bolts, nuts, and washers
3
Surgical & Medical Equipment
Tools requiring sterility and mechanical precision
4
Defense & Military Hardware
High-strength parts for harsh environments
5
Chemical Processing Equipment
Withstanding corrosion and high pressure
6
Heavy Machinery
Load-bearing components with heat-treated resilience
Trust Reliability & Quality
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)
Frequently Asked Questions
B72M is a precipitation-hardened stainless steel alloy with balanced strength, corrosion resistance, and heat-treatable properties—ideal for high-stress environments.
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