ASTM F468/F468M UNS N06686 Hex bolt

China professional manufacturer of ASTM F468/F468M UNS N06686 Hex bolt

What is No6686 Hex bolt?

N06686 hex bolt is a fastener made of Alloy 686 (UNS N06686) steel.

Alloy 686 (UNS N06686) is a single-phase, austenitic Ni-Cr-Mo superalloy with tungsten alloying addition. It resists highly aggresive oxidizing (thanks to high chromium) and reducing (nickel and molybdenum) environments

ASTM F468

Standard Specification for Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs for General Use
astm-f468/ F468M covers the requirements for commercial wrought nonferrous bolts, hex cap screws, and studs 1/4 Inch to 1 1/2 inch in imperial sizes and M1 to M36 in metric sizes and socket head cap screws (including socket head cap, button head and flat countersunk head configurations) with nominal thread #0 through 1 1/2 inch in imperial sizes and M1 to M36 in metric sizes inclusive in diameter manufactured from a number of alloys in common use and intended for general service applications. Commercial wrought nonferrous bolts, hex cap screws, and studs and socket head cap screws in common use and intended for general service applications. Applicable nuts for use with bolts, cap screws, and studs covered by this specification are covered by Specification ASTM F467 / F467M. The starting condition of the raw material shall be at the discretion of the fastener manufacturer except as provided in Supplementary Requirement S5, but shall be such that the finished products conform to all of the specified requirements. Unless otherwise specified, the fasteners shall be cold formed, hot formed, or machined from suitable material, at the option of the manufacturer.

Chemical Composition of No6686

Cr Mo Co Ni Ti
19.0-23.0 15.0-17.0 ≤1.00 Rest 0.02-0.25
C Si Mn P S
≤0.010 ≤0.08 ≤0.75 ≤0.025 ≤0.015
W Fe V Al
3.00-4.40 ≤2.00 ≤0.20 ≤0.50

Mechanical Properties of N06686

0.2% Yield strength Rp≥N/mm2 Tensile strength RmN/mm2 Elongation A5≥%
385 ≥760 65

General Specifications for UNS N06686 Hex Bolt

Property Specification
Material Grade UNS N06686 (Inconel® 686)
Alloy Type Nickel-Chromium-Iron Alloy
Standard Typically manufactured to ASTM B166, ASTM F468, or equivalent for bolts
Bolt Type Hex Bolt
Size Range From M6 (1/4 inch) to M36 (1 1/2 inches), or as required by the application
Thread Type UNF (Unified National Fine), UNC (Unified National Coarse), or Metric threads (depending on the requirement)
Finish Typically Plain, but available with PTFE coating
Head Type Hexagonal head, designed for easy tightening with a standard wrench or socket
Tensile Strength 85,000 psi (586 MPa)
Yield Strength 37,000 psi (255 MPa)
Elongation 40% (in 2 inches)
Hardness Typically around Rockwell B85 or equivalent hardness scale

Application of UNS N06686 Bolt

  • Chemical Processing: Equipment and components exposed to highly corrosive environments (e.g., hydrochloric acid, sulfuric acid).
  • Power Generation: Components in power plants, particularly those subjected to high heat and pressure.
  • Aerospace: High-performance applications where resistance to oxidation and corrosion is critical, including turbine engines and exhaust systems.
  • Marine: Offshore oil and gas platforms, and other marine environments.
  • Heat Exchangers: Used in environments with high temperatures and aggressive chemicals.

UNS N06686 is a nickel-chromium-iron alloy commonly known as Inconel® 686. It is known for its excellent resistance to corrosion, especially in harsh environments like those involving high temperatures and aggressive chemicals. This alloy is often used in applications such as chemical processing, power generation, and aerospace.

The UNS N06686 Hex Bolt is manufactured to provide superior strength and resistance to oxidation, making it ideal for critical, high-performance applications.