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ASTM A193 B16 Stud Bolt
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Name: ASTM A193 B16 Stud Bolt
Material: ASTM A193 B16
Application: For High Tensile, High Temperature and Special Purpose Applications
Feature: Heat Treated Cr-Mo-V Alloy Steel Bolting
Size: 3/4 Inch
Length: 85mm
Max Hardness: 35 HRC
Material: ASTM A193 B16
Application: For High Tensile, High Temperature and Special Purpose Applications
Feature: Heat Treated Cr-Mo-V Alloy Steel Bolting
Size: 3/4 Inch
Length: 85mm
Max Hardness: 35 HRC
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ASTM A193 B16 Stud Bolt is manufactured from high-strength Cr-Mo-V alloy steel, achieving hardness ≤35HRC through specialized heat treatment while maintaining exceptional high-temperature strength and creep resistance. This double-ended stud features a standard specification of 3/4"×85mm and is specifically engineered for critical high-temperature/pressure equipment such as power plant boilers and petrochemical reactors, fully complying with ASTM's stringent requirements for extreme-service fasteners.
Surface Treatment Technology for ASTM A193 B16 Stud Bolt
As a core connecting component in high-temperature/pressure environments, Stud Bolt requires surface treatments that balance corrosion protection, friction coefficient control, and hydrogen embrittlement risks. Key process comparisons:
As a core connecting component in high-temperature/pressure environments, Stud Bolt requires surface treatments that balance corrosion protection, friction coefficient control, and hydrogen embrittlement risks. Key process comparisons:
| Treatment | Standard | ASTM A193 B16 Stud Bolt Suitability |
| Phosphating | ASTM F1137 | Cost-effective solution (200°C limit) |
| Uncoated | - | Optimal for high temperature (593°C) |
1. Optimized Phosphating Process (Recommended for ASTM A193 B16 Stud Bolt)
- Process Flow:
Alkaline degreasing → Acid pickling → Manganese phosphate coating (Mn₃(PO₄)₂ crystallization) → Sealing treatment
- Process Flow:
Alkaline degreasing → Acid pickling → Manganese phosphate coating (Mn₃(PO₄)₂ crystallization) → Sealing treatment
- Performance Advantages:
- 72-hour salt spray test without white rust (ASTM B117)
- Hydrogen permeation rate 1.5×10⁻⁶ g/cm²·h, significantly lower than zinc plating
- 72-hour salt spray test without white rust (ASTM B117)
- Hydrogen permeation rate 1.5×10⁻⁶ g/cm²·h, significantly lower than zinc plating
2. High-Temperature Uncoated Solution (Core Application for ASTM A193 B16 Stud Bolt)
- Technical Parameters:
- Oxidation rate: 0.05mg/cm²·h (at 593°C)
- Recommended pairing with MoS₂ lubrication (friction coefficient reduced to 0.03-0.07)
- Technical Parameters:
- Oxidation rate: 0.05mg/cm²·h (at 593°C)
- Recommended pairing with MoS₂ lubrication (friction coefficient reduced to 0.03-0.07)
- Alternative Processes:
- Vacuum nitriding (650°C resistance)
- Plasma-sprayed Cr₂O₃ (900°C resistance)
- Vacuum nitriding (650°C resistance)
- Plasma-sprayed Cr₂O₃ (900°C resistance)
Hydrogen Embrittlement Control for ASTM A193 B16 Stud Bolt
For high-risk electroplating processes, Stud Bolt must strictly adhere to:
- Hydrogen removal: 200℃×24h (ASTM F1941)
- Critical stress threshold: Residual stress <65%σ₀.₂
For high-risk electroplating processes, Stud Bolt must strictly adhere to:
- Hydrogen removal: 200℃×24h (ASTM F1941)
- Critical stress threshold: Residual stress <65%σ₀.₂
| Test Method | ASTM A193 B16 Stud Bolt Compliance Requirement |
| ISO 15330 | No fracture under 80%σ₀.₂ constant load for 200 hours |
Selection Guide for ASTM A193 B16 Stud Bolt
| Service Condition | Recommended Process | Stud Bolt Technical Focus |
| Hydrogen service | Polishing (Ra<0.4μm) | Avoid stress concentration-induced HIC |
| T>300°C | Uncoated + WS₂ | Pre-applied solid lubricant reduces wear |
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