ASTM A453 Grade 660 Round Bar UNS S66286 Alloy A286 Precipitation Hardening Superalloy Rod

Alloy 660 Round Bar

1. Product Overview

Alloy 660 round bar, also known as A286 / UNS S66286, is a precipitation-hardening iron-nickel-chromium austenitic superalloy. Equivalent to DIN 1.4980 (X6NiCrTiMoVB25-15-2) and Chinese GH2132. It achieves high strength via solution treatment plus aging heat treatment. It retains excellent tensile strength, creep resistance and oxidation resistance up to 700°C, non-magnetic, with good fatigue performance and machinability. Our 660 round bars are hot rolled or cold drawn, available in black surface, peeled, ground & bright finish. All products can be supplied with EN10204 3.1 material test certificate, complying with ASTM A453, ASTM A638 and AMS aerospace standards.

2. Chemical Composition (wt%, ASTM A453 / A638 Standard)

• Carbon (C): ≤0.08
• Silicon (Si): ≤1.00
• Manganese (Mn): ≤2.00
• Phosphorus (P): ≤0.040
• Sulfur (S): ≤0.030
• Chromium (Cr): 13.50 ~ 16.00
• Nickel (Ni): 24.00 ~ 27.00
• Molybdenum (Mo): 1.00 ~ 1.50
• Titanium (Ti): 1.90 ~ 2.35
• Aluminum (Al): ≤0.35
• Vanadium (V): 0.10 ~ 0.50
• Boron (B): 0.003 ~ 0.010
• Iron (Fe): Balance

3. Mechanical Properties (Solution Treated + Aged, Room Temp, ASTM A453 Class A/B)

• Ultimate Tensile Strength: ≥895 MPa (130 ksi)
• 0.2% Offset Yield Strength: ≥585 MPa (85 ksi)
• Elongation: ≥15%
• Reduction of Area: ≥18%
• Hardness: 24 ~ 35 HRC (248–341 HB)
• Maximum working temperature: 700°C

Remark: Different classes (A/B/C/D) have different mechanical requirements, we can customize heat treatment according to customer drawings.

4. Key Advantages

1. Outstanding high-temperature creep strength, maintains mechanical property under long-time thermal load
2. Good oxidation resistance at elevated temperature
3. Excellent fatigue resistance, suitable for dynamic vibration service
4. Good machinability for fastener, bolt, shaft and precision parts processing
5. Moderate corrosion resistance to atmospheric, oil and weak chemical media
6. Non-magnetic after heat treatment

5. Applications

• Aerospace industry: Aircraft engine fasteners, bolts, studs, turbine components
• Power generation: Gas turbine parts, boiler high-temperature bolts, steam turbine accessories
• Petrochemical & Oil & Gas: High-temperature pipeline bolting, pressure vessel studs
• Automotive & Machinery: High-temperature exhaust components, turbocharger parts
• Industrial equipment: Heat-resistant fixtures, high temperature springs and structural shafts

6. Available Specifications & Service

• Diameter range: Φ6mm ~ Φ200mm
• Length: 1000–6000mm or customized cut-to-length
• Surface: Black hot rolled, peeled, centerless ground, bright polished
• Service: OEM cutting, heat treatment, MTR 3.1 certificate, third-party inspection acceptable