quality ASTM B444 Inconel 625 Fittings with Corrosion Resistance and High-Temperature Strength for Tees Laterals Y Pieces and Sleeves factory

ASTM B444 Inconel 625 Fittings with Corrosion Resistance and High-Temperature Strength for Tees Laterals Y Pieces and Sleeves

ASTM B444 UNS N06625 (Inconel 625) nickel-based superalloy offers excellent corrosion resistance and high-temperature strength. Its composition—high nickel/chromium for oxidation resistance, molybdenum/niobium for strength, and low carbon/sulfur for weldability—makes it ideal for aerospace, chemical, marine, and oil & gas applications.

Product Description

ASTM B444 UNS NO6625 Special Fittings: Tees, Laterals, Y Pieces, Sleeves

ASTM B444 UNS N06625 (commonly known as Inconel 625) is a nickel-based superalloy designed for exceptional corrosion resistance and high-temperature strength applications.

Chemical Composition

Element	Composition Limits
Nickel (Ni)	Balance
Chromium (Cr)	20.0 – 23.0%
Molybdenum (Mo)	8.0 – 10.0%
Niobium (Nb) + Tantalum (Ta)	3.15 – 4.15%
Iron (Fe)	≤ 5.0%
Cobalt (Co)	≤ 1.0%
Manganese (Mn)	≤ 0.50%
Silicon (Si)	≤ 0.50%
Aluminum (Al)	≤ 0.40%
Titanium (Ti)	≤ 0.40%
Carbon (C)	≤ 0.10%
Phosphorus (P)	≤ 0.015%
Sulfur (S)	≤ 0.015%

Key Composition Benefits

High Nickel + Chromium: Provides excellent resistance to oxidation and corrosion in aggressive environments including seawater and various acids.
Molybdenum + Niobium: Significantly improve strength at elevated temperatures and enhance resistance to pitting and crevice corrosion in chloride environments.
Low Carbon, Sulfur, and Phosphorus: Minimizes carbide precipitation and hot-cracking, improving weldability and material toughness.
Controlled Aluminum and Titanium: Maintains weldability and ductility by preventing excessive strengthening precipitates that could cause brittleness.

Application Note: ASTM B444 specifically covers seamless pipe and tube made from this alloy. The controlled composition ensures the material meets mechanical and corrosion-resistance requirements for demanding applications in aerospace, chemical processing, marine, and oil & gas industries.

Important: For critical design or certification purposes, always verify against the latest official ASTM B444 specification or the mill test certificate (MTC) from the manufacturer.