ASTM A193 Grade B6 Stud Bolt (AISI 410) with ASTM A194 Grade 6 Hex Nuts
ASTM A193 Grade B6 Stud Bolt Manufacturer & Supplier
We are a professional manufacturer and exporter of ASTM A193 Grade B6 stud bolts and ASTM A194 Grade 6 hex nuts in China, supplying high-quality martensitic stainless steel fastening solutions for high-temperature and moderately corrosive industrial environments.
Our A193 B6 stud bolts are widely used in refineries, petrochemical plants, power generation systems, valves, flanges, pressure vessels, heat exchangers, and marine engineering equipment, where strength, hardness, and oxidation resistance are required.
What is ASTM A193 Grade B6?
ASTM A193 Grade B6 is a martensitic stainless steel bolting material equivalent to AISI 410 (UNS S41000), designed for high-temperature and high-pressure service.
It contains approximately 12–13% chromium, providing:
- Moderate corrosion resistance
- High tensile strength
- Good hardness and wear resistance
- Excellent dimensional stability
Unlike austenitic stainless steels (such as 304/316), B6 offers higher hardness but lower corrosion resistance, making it suitable for mechanical strength-driven applications rather than severe corrosion environments.
Matching Nut Grade – ASTM A194 Grade 6
ASTM A193 Grade B6 stud bolts are typically used together with:
👉 ASTM A194 Grade 6 Hex Nuts
These nuts are also manufactured from martensitic stainless steel (AISI 410 equivalent), ensuring:
- Material compatibility
- Equal hardness balance
- Reliable torque performance
- Anti-galling behavior under load
ASTM A193 Grade B6 Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | A193 B6 |
| UNS | S41000 |
| Werkstoff Nr. | 1.4006 |
| JIS | SUS 410 |
| BS | 410S21 |
| EN | X12Cr13 |
| Material Type | AISI 410 Stainless Steel |
Chemical Composition of ASTM A193 Grade B6
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.08 – 0.15 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 11.5 – 13.5 |
| Nickel (Ni) | — |
| Molybdenum (Mo) | — |
Mechanical Properties of ASTM A193 Grade B6
| Property | Value |
|---|---|
| Tensile Strength | ≥ 760 MPa (110 ksi) |
| Yield Strength | ≥ 585 MPa (85 ksi) |
| Elongation | ≥ 15% |
| Hardness | Controlled / application dependent |
| Density | 7.75 g/cm³ |
Product Types
We supply a full range of ASTM A193 B6 fasteners:
Stud Bolts
- Full Thread Stud Bolts
- Double End Stud Bolts
- Heavy Duty Stud Bolts
Threaded Rods
- Full Thread Rods
- Cut-to-length Stud Rods
Hex Bolts (optional supply)
- Heavy Hex Bolts
- Machine Bolts
Nuts
- ASTM A194 Grade 6 Hex Nuts
- Heavy Hex Nuts (on request)
Size Range
| Item | Range |
|---|---|
| Diameter | 1/4″ – 4″ (M6 – M100) |
| Length | 10 mm – 3000 mm+ |
| Threads | UNC / UNF / Metric / 8UN |
| Finish | Black, Zinc plated, Hot dip galvanized, PTFE coated |
Custom sizes available according to project requirements.
Applications of ASTM A193 Grade B6 Stud Bolts
Oil & Gas Industry
- Pipeline flanges
- Valves and pressure joints
- Refinery equipment
Petrochemical Plants
- Reactor systems
- Heat exchangers
- Process piping
Power Generation
- Boiler systems
- Steam pipelines
- Turbine auxiliaries
Marine & Offshore
- Pump systems
- Cooling systems
- Structural bolting
Industrial Equipment
- Compressors
- Pressure vessels
- High-load mechanical assemblies
Advantages of ASTM A193 B6 Stud Bolts
- High tensile strength and hardness
- Good oxidation resistance
- Stable performance at elevated temperatures
- Cost-effective compared to high nickel alloys
- Excellent wear resistance
- Good machinability and threading stability
Heat Treatment Condition
ASTM A193 Grade B6 fasteners are typically supplied in:
- Quenched and tempered condition
- Hardened and tempered condition
Heat treatment ensures:
- Uniform microstructure
- Stable mechanical properties
- Improved load-bearing capacity
Inspection & Testing
All ASTM A193 B6 stud bolts can be supplied with:
- Chemical composition analysis
- Mechanical testing (tensile, hardness)
- Dimensional inspection
- Thread gauge inspection
- PMI testing
- Third-party inspection (SGS / BV / DNV / TUV)
Packaging
Export standard packaging includes:
- Wooden cases
- Cartons + plastic bags
- Anti-rust oil protection
- Thread protection caps
- Label marking as per ASTM requirements
How to Order ASTM A193 Grade B6 Stud Bolts?
Example 1
ASTM A193 B6 Stud Bolt + ASTM A194 Grade 6 Nut
Size: 3/4″ × 100 mm
Thread: UNC
Finish: Black oxide
Quantity: 500 pcs
Example 2
AISI 410 Stud Bolt
Size: M24 × 200 mm
Standard: ASTM A193 B6 / ASTM A194 6
Quantity: 1000 pcs
FAQ
What is ASTM A193 Grade B6?
ASTM A193 B6 is a martensitic stainless steel (AISI 410 equivalent) stud bolt grade used for high-strength applications.
What is ASTM A194 Grade 6?
ASTM A194 Grade 6 is the matching nut grade for B6 bolts, also made from AISI 410 stainless steel.
Is B6 stainless steel corrosion resistant?
It has moderate corrosion resistance but is mainly used for strength and hardness rather than severe corrosion environments.
What is B6 equivalent to?
It is equivalent to AISI 410 stainless steel (UNS S41000).
