Grade B7M Fasteners: Manufacturer, Supplier & Exporter in India
Introduction
Fasteners are the unsung heroes of every industrial structure and engineering project. Among the various grades of fasteners, ASTM A193 Grade B7M stands out for its superior corrosion resistance and suitability for high-pressure, high-temperature environments—especially where hydrogen-induced cracking or stress corrosion is a concern.
At Ananka Group, we specialize in manufacturing and supplying high-quality Grade B7M fasteners, including bolts, studs, nuts, and washers, tailored to meet global standards across petrochemical, oil & gas, and power industries.
What is ASTM A193 Grade B7M?
ASTM A193 Grade B7M is a modified version of the more common Grade B7, with enhanced metallurgical properties achieved through tempering and hardening processes. It is designed for use in highly corrosive and high-temperature environments.
This grade undergoes controlled heat treatment to reduce hardness and enhance ductility and toughness, making it suitable for sour service environments (H2S environments).
Chemical Composition of Grade B7M
The alloying of Chromium and Molybdenum increases its resistance to oxidation, creep, and corrosion.
Mechanical Properties of Grade B7M
Compared to Grade B7, the lower hardness limit of B7M helps in preventing hydrogen embrittlement and stress corrosion cracking.
Key Features and Benefits
✅ Sour Gas Service Suitable – Compliant with NACE MR0175/ISO 15156
✅ Reduced Hardness – Improves resistance to embrittlement and cracking
✅ Enhanced Ductility – Allows flexibility in demanding conditions
✅ Heat Treated for Stability – Ensures strength without compromising corrosion resistance
✅ Custom Finishes Available – PTFE Coated, Zinc Plated, Hot Dip Galvanized, and more
Applications of Grade B7M Fasteners
Grade B7M fasteners are used where environmental conditions can lead to stress corrosion cracking, especially in:
⚙️ Oil & Gas Pipelines
🔥 Petrochemical Plants
🏭 Power Generation (Thermal & Nuclear)
💧 Water Treatment Facilities
🚢 Marine and Offshore Platforms
🧪 Chemical Processing Plants
These fasteners are ideal for flanges, pressure vessels, heat exchangers, and valves operating under high temperatures and corrosive media.
Grade B7 vs Grade B7M – What’s the Difference?
The key distinction is in the hardness control and NACE MR0175 compliance, which makes B7M preferred for sour gas environments.
Types of B7M Fasteners Offered by Ananka Group
B7M Bolts – Hex Bolts, Heavy Hex Bolts, Shoulder Bolts
B7M Studs – Fully Threaded Studs, Double-End Studs
B7M Nuts – Heavy Hex Nuts, Cap Nuts
B7M Washers – Flat Washers, Spring Washers
Custom B7M Fasteners – Based on client specifications and drawings
Certifications & Standards
Our B7M fasteners comply with:
ASTM A193/A193M
ASME B18.2.1 / B18.2.2
NACE MR0175 / ISO 15156
DIN, ISO, BS, and ANSI standards
Each product is tested and certified with Mill Test Certificates (MTC), PMI Testing, and Third-party Inspection Reports.
Why Choose Ananka Group for B7M Fasteners?
In-house Manufacturing: Modern machinery, CNC, and forging units Custom Production: Tailored solutions based on project needs Stringent Quality Control: ISO 9001:2015 certified processes Global Supply Network: Fast delivery to the USA, Europe, Middle East, Asia, and Africa Competitive Pricing: Without compromising on quality or compliance
Conclusion
When working in harsh environments especially those involving high pressure, high temperature, and corrosive or sour gases ASTM A193 Grade B7M fasteners are the ideal solution. Their reliability, performance, and safety make them a preferred choice in critical industrial applications.
Ananka Group ensures you receive top-grade B7M fasteners backed by engineering expertise, fast delivery, and complete traceability. Whether you're constructing a refinery or outfitting an offshore platform, our B7M fasteners provide the peace of mind your operations need.
Frequently Asked Questions (FAQ)
Q1. What is the difference between B7 and B7M fasteners? A: B7M fasteners are heat-treated to a lower hardness level than B7 to improve ductility and corrosion resistance, especially for sour gas services.
Q2. Are B7M fasteners suitable for NACE applications? A: Yes, B7M is designed for sour service applications and meets NACE MR0175/ISO 15156 standards.
Q3. What finishes are available for B7M fasteners? A: Zinc plating, hot-dip galvanizing, PTFE coating, and other custom coatings are available.
Q4. Can Ananka Group manufacture B7M fasteners as per custom specifications? A: Absolutely. We specialize in custom manufacturing based on client drawings or international standards.
Q5. Do you offer third-party inspections? A: Yes, we provide third-party inspection and complete traceability with test certificates.