China Professional Manufacturer of ASTM B425 Incoloy 825 Stud Bolt, UNS N08825 NiCr21Mo Hex Bolt

ASTM B425 Incoloy 825 stud bolts are high-performance fasteners manufactured from a nickel-iron-chromium alloy. Designed to withstand demanding environments, these stud bolts offer excellent corrosion resistance, high strength, and exceptional durability, making them ideal for use in industries such as chemical processing, marine engineering, and oil & gas.

 

N08825 is a nickel-iron-chromium alloy, commonly known as Incoloy 825. It is specifically designed for use in highly corrosive environments, offering excellent resistance to oxidation, pitting, and stress corrosion cracking. This alloy is particularly valued for its performance in both oxidizing and reducing environments due to the following key components:

  • Nickel (38-46%): Provides corrosion resistance and enhances strength in reducing environments.
  • Chromium (19.5-23.5%): Contributes to oxidation resistance.
  • Molybdenum (2.5-3.5%): Enhances pitting and crevice corrosion resistance.
  • Copper (1.5-3%): Increases resistance to sulfuric and phosphoric acids.
ASTM B425 Incoloy 825 Stud Bolt, UNS N08825 NiCr21Mo

Chemical Composition of N08825 Stud bolt

Ni Fe Cr Mb Cu Ti C Mn S Si Al
38.0-46.0 22.0 min 19.5-23.5 2.5-3.5 1.5-3.0 .6-1.2 0.05 max 1.0 max 0.03 max 0.5 max 0.2 max

Incoloy 825 Stud Bolts Advantage

  1. Corrosion Resistance: Incoloy 825 provides outstanding resistance to general corrosion, pitting, and crevice corrosion in both oxidizing and reducing environments.
  2. High-Temperature Strength: With excellent thermal stability, these stud bolts perform reliably at elevated temperatures.
  3. Stress Corrosion Cracking Resistance: Ideal for environments where chloride-induced stress corrosion cracking is a concern.
  4. Versatility: Suitable for diverse applications including sour gas environments, seawater systems, and acidic solutions.

ASTM B425 ensures quality and performance consistency for Incoloy 825 stud bolts. Compliance with this specification guarantees that the material meets stringent industry requirements for chemical composition, mechanical properties, and dimensional accuracy.

This specification covers nickel-iron-chromiummolybdenum-copper alloy (UNS N08825 and UNS N08221)* in the form of hot-finished and cold-drawn rounds, squares, hexagons, and rectangles. The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

N08825 Heat Treatment

Incoloy 825 is stabilise annealed at 940°C. The softest structure is obtained at 980°C. Sections heavier than sheet, strip and wire should be quenched to avoid sensitisation.

ASTM B425 N08825 Stud bolt Specification

Grade Incoloy 825 (UNS N08825)
Dimension DIN, ASTM, BS and all International Standards
Length M02 to M33
Size 3 mm to 200 mm | Custom Sizes
Types Threaded Rod, Class A double ended stud, Tie Rod, Double Ended Stud, Stud Bolts, Bronze Hex Studs, Threaded Studs etc

Key Features of ASTM B425 Incoloy 825 Stud Bolts

Exceptional Corrosion Resistance – Resistant to sulfuric, phosphoric, and hydrochloric acids.
High Strength & Durability – Excellent mechanical properties for high-pressure & high-temperature applications.
Superior Oxidation & Pitting Resistance – Performs well in chloride-rich and seawater environments.
Excellent Stress Corrosion Cracking Resistance – Ideal for harsh chemical & offshore conditions.
Good Weldability & Fabrication – Suitable for custom machining & manufacturing.

Applications of  Incoloy 825 Stud Bolts

Chemical & Petrochemical Industry – Used in acid processing, reactors, and heat exchangers.
Oil & Gas Industry – Suitable for offshore platforms, pipelines, and sour gas environments.
Marine & Seawater Applications – Resistant to saltwater corrosion and high-pressure conditions.
Power Plants & Nuclear Reactors – Performs well in high-temperature environments.
Food & Pharmaceutical Processing – Corrosion-resistant for hygienic and acidic environments.

We supply high-quality Incoloy 825 stud bolts in various sizes and coatings with fast delivery worldwide.

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