A193 B7M Alloy Steel Black Oxide Threaded Rods
A193 B7M Alloy Steel Black Oxide Threaded Rods are essential components in high-temperature and high-pressure applications across industries such as petrochemical, power generation, and infrastructure. Designed for superior strength, corrosion resistance, and durability, these threaded rods combine the robustness of alloy steel with the protective benefits of black oxide coating.
At Flybear Fastener, we supply precision-manufactured A193 B7M threaded rods that meet rigorous international standards and customer specifications. These fasteners are widely utilized to connect structural elements, flanges, or equipment in challenging environments, ensuring long-lasting performance and safety.
Product Overview
The ASTM A193 B7M Alloy Steel Black Oxide Threaded Rod is a quenched and tempered chromium-molybdenum steel fastener, modified for additional corrosion resistance and lower hardness (specifically designed for use in sulfur-rich environments). The black oxide finish provides mild corrosion resistance and an appealing matte black appearance while increasing lubricity, making installation easier.
A193 B7M threaded rods are typically used in environments where both high strength and corrosion resistance are required. Their reduced hardness (compared to B7) minimizes the risk of hydrogen embrittlement and stress corrosion cracking.
Product Specification Table
| Specification | Details |
|---|---|
| Material | A193 B7M Alloy Steel |
| Finish | Black Oxide |
| Thread Type | UNC/UNF/Metric |
| Length | Custom cut to size (up to 4 meters) |
| Diameter Range | 1/4” to 4” / M6 to M100 |
| Tolerance | As per ASTM A193 / customer drawing |
| Hardness | HRC ≤ 35 |
| Marking | Specified as B7M |
| Minimum Quantity | As required |
Technical Parameters
| Parameter | Specification |
|---|---|
| Strength Grade | ASTM A193 B7M Equivalent to CL 10.9 |
| Surface Treatment | Black Oxide, optional zinc plating or PTFE |
| Certification Standards | ASTM A193, ANSI, DIN, ISO, GB |
| Mechanical Properties | Yield strength ≥ 205 MPa |
| Testing Standard | ASME, ISO898-1, RoHS compliant |
| Operating Temperature | Suitable up to 450°C |
Material and Manufacturing Process
The A193 B7M rods are made from alloy steel containing chromium and molybdenum for enhanced tensile strength and high-temperature performance. The ‘M’ designation indicates that the rods are heat-treated to a lower hardness, providing better resistance to hydrogen sulfide environments typically found in sour gas services.
Manufacturing Process:
- Raw material sourcing – alloy steel bar or coil
- Cutting to length
- Thread rolling or cutting
- Heat treatment (tempered to meet B7M hardness specification)
- Black oxide surface treatment
- Final inspection checks
- Packaging and labeling
Each process step is strictly monitored at Flybear Fastener to maintain dimensional precision and material integrity.
Typical Applications and Industries
These threaded rods are widely used in:
- Oil & gas industry, particularly in sour gas service (H2S environments)
- Petrochemical refineries
- Pressure vessels and flanges
- Valves and pumps
- High-temperature piping systems
- Offshore platforms
- Boilers and heat exchangers
Their resistance to stress corrosion cracking and reduced hardness makes them ideal for demanding environments.
Product Advantages & Competitive Edge
At Flybear Fastener, our A193 B7M Alloy Steel Black Oxide Threaded Rods offer distinct advantages:
- Premium Materials: We use well-tested chrome-moly alloy steel for maximum load capacity.
- Precision Manufacturing: Tight tolerances, uniform threading, and consistency in performance.
- Advanced Surface Treatment: Black oxide coating adds a mild corrosion layer without affecting dimensional integrity.
- Customization: We can produce to your specified length, thread form (UNC/UNF/metric), or coating.
- Large Inventory: Ready-to-ship stocks for commonly used sizes; quick turnaround for custom orders.
- Excellent Service: Engineering assistance and responsive after-sales support.
Quality Control and Inspection Protocols
Quality assurance is at the heart of our manufacturing process. Our lab and in-house testing facilities include:
- Thread gauges (plug and ring)
- Tensile strength testing machines
- Salt spray corrosion test chamber (for benchmarking surface performance)
- Optical sorting
- Hardness testers (Rockwell, Brinell)
- Coating thickness meters
- Metallography inspection devices
- Torque and bending resistance testers
All final products undergo 100% inspection under defined sampling plans, ensuring high consistency and compliance with customer and industry standards. Our facility is ISO9001 and IATF16949 certified for quality management.
Guide to Selection and Procurement A193 B7M threaded rods
When choosing threaded rods for your applications, consider the following:
- Environmental conditions: Is corrosion a concern? Use black oxide or other anti-rust coatings.
- Required mechanical properties: Load-bearing capabilities, ductility, and thermal performance.
- Compatibility: With nuts, washers, and structural combinations.
- Compliance: ASTM, DIN, ISO standards as required by project needs.
- Length and thread specifications: Customization based on assembly design.
We offer support in selecting the right fasteners. Contact our technical team for guidance or submit your drawings for tailored solutions.
Conclusion
At Flybear Fastener, we are committed to delivering high-quality fastener products that meet international standards and rigorous application demands. Our A193 B7M Alloy Steel Black Oxide Threaded Rods are engineered for durability, precision, and performance.
We proudly offer industry-specific solutions backed by technical expertise and unmatched service. Whether you’re involved in petrochemical, infrastructure, or energy sectors, our threaded rods provide the strength and corrosion resistance you need. Feel free to contact us for a quote, procurement support, or a tailored fastener solution.
We always adhere to the principle of “quality first, customer foremost”, focusing on providing clients with high-grade fastener products and one-stop fastener solutions tailored to their industries.
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