Best Stainless is proud to offer 304B stainless steel bars, manufactured to B8 Class 2 and ASTM A-479/A276 specifications. This high-strength austenitic grade combines exceptional corrosion resistance with enhanced mechanical properties, making it ideal for demanding fastener and structural applications. Our 304B stainless steel bars feature a minimum tensile strength of 125,000 psi and a minimum yield strength of 100,000 psi, with excellent performance in both marine and chemical processing environments. Available in precision ground round bar and threaded rod configurations, these products are particularly valued in applications where standard 304 stainless steel's properties would be insufficient.
Available Forms
- Round Bar: Precision ground and polished finish
- Threaded Rod: Full-length threading with consistent pitch and profile
Technical Specifications
Chemical Composition (Nominal)
- Carbon: 0.08% max
- Chromium: 18.0-20.0%
- Nickel: 8.0-10.5%
- Manganese: 2.00% max
- Silicon: 1.00% max
- Phosphorus: 0.045% max
- Sulfur: 0.030% max
Mechanical Properties (Class 2)
- Minimum Tensile Strength: 125,000 psi
- Minimum Yield Strength: 100,000 psi
- Elongation in 2 inches: 15% min
- Reduction of Area: 45% min
- Hardness: 25-32 HRC
Common Applications
- High-strength fasteners for corrosive environments
- Marine and offshore equipment
- Chemical processing equipment
- Food processing equipment
- Pharmaceutical manufacturing components
Key Features & Benefits
- Superior corrosion resistance compared to standard 304 stainless steel
- High strength achieved through strain hardening
- Excellent mechanical properties at both high and low temperatures
- Non-magnetic when annealed (magnetic when cold worked)
- Excellent machinability and fabricability
Quality Standards
All products are manufactured in accordance with:
- ASTM A276/A276M - Standard Specification for Stainless Steel Bars and Shapes
- ASTM A479/A479M - Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
- ASME SA-276/SA-276M - Stainless Steel Bars and Shapes
304 B (B8 CLASS 2) Mechanical Properties
Heat Treatment: Carbide solution treated and strain hardened
| Diameter (inches) | Tensile Strength (min) | Yield Strength (min) | Elongation in 4D | Reduction of Area | Hardness |
|---|---|---|---|---|---|
| ¾ and under | 125 ksi | 100 ksi | 12% | 35% | 321 HBW or 35 HRC |
| over ¾ to 1 | 115 ksi | 80 ksi | 15% | 35% | 321 HBW or 35 HRC |
| over 1 to 1¼ | 105 ksi | 65 ksi | 20% | 35% | 321 HBW or 35 HRC |
| over 1¼ to 1½ | 100 ksi | 50 ksi | 28% | 45% | 321 HBW or 35 HRC |
Notes:
- Properties shown are minimums except for hardness (maximum)
- Center (core) properties may be lower than indicated by test reports which are based on values determined at ½ radius for diameters 1½" and over
- For sizes ¾ in. in diameter and smaller, a maximum hardness of 241 HBW (100 HRB) is permitted
- Austenitic steels in the strain-hardened condition may not show uniform properties throughout the section particularly in sizes over ¾ in. in diameter
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