Understanding A286 Alloy Fundamentals

A286 (ASTM A453 Grade 660) is a precipitation-hardened iron-nickel-chromium alloy renowned for maintaining exceptional yield strength at elevated temperatures up to 1300°F (704°C). The alloy's balanced composition of 25% nickel, 15% chromium and 2% titanium creates superior mechanical properties through age hardening.

Key Material Properties

Yield Strength Performance Factors

Three primary variables affect A286 bolt yield strength in service:

1. Heat Treatment Condition

• Solution Annealed (Condition A): 85-95 ksi yield strength range
• Age Hardened (Condition H): 110-120 ksi yield strength range
• Double Aged (Condition H+): Up to 130 ksi yield strength

2. Temperature Effects

A286 maintains approximately 85% of its room temperature yield strength at 1000°F (538°C), outperforming standard stainless steels. Critical temperature thresholds:

Grade Selection Methodology

Follow this decision matrix when specifying A286 bolts:

Application Requirements

1. Determine maximum service temperature
2. Calculate required clamp load
3. Identify corrosion exposure
4. Evaluate vibration/fatigue factors

Material Condition Guidelines

• Condition A: Best for forming operations requiring subsequent heat treatment
• Condition H: Standard for most high-temperature bolting applications
• Condition H+: Recommended for extreme stress applications

Industry Applications

A286 bolts deliver reliable performance in these critical environments:

Aerospace Systems

Jet engine components, turbine casings and afterburner assemblies where yield strength must withstand thermal cycling.

Oil & Gas Equipment

Downhole tools, wellhead equipment and flare systems exposed to sour gas and high pressures.

Why Choose RAYCHIN A286 Fasteners

RAYCHIN LIMITED provides technical advantages through:

• Precision-controlled heat treatment processes
• Full traceability with mill test reports
• Custom engineering support for critical applications
• Global logistics network with AS9120 certification

Contact our metallurgical experts for project-specific yield strength recommendations and fastener solutions.