ASTM B167 Inconel 690 pipe

ASTM B167 covers seamless nickel-chromium-iron alloy (Ni-Cr-Fe) pipe for high temperature and corrosive applications.
Inconel 690 is a high chromium nickel-chromium alloy optimized to resist oxidation, carburization, and corrosion in harsh environments.

High chromium content (27-31%): Excellent resistance to oxidizing acids (e.g., nitric acid), chlorides, and high temperature oxidation.

Low thermal expansion: Suitable for thermal cycling applications.

Resistance to stress corrosion cracking (SCC): Excellent in alkaline and acidic environments.

Stability in high temperature water: Widely used in nuclear and power generation systems.

Superior oxidation resistance compared to alloys with lower chromium content (e.g., Inconel 600). Minimal sensitivity to chloride-induced stress

corrosion cracking and intergranular corrosion.

Long-term stability in high temperature water (e.g., nuclear coolant systems).

Inconel 690 Pipes & Tubing Chemical Composition

Application

Nuclear Industry: Steam generator tubes, reactor components in pressurized water reactors (PWRs).

Chemical Processing: Heat exchangers, piping for nitric acid, and caustic solutions.

Power Generation: Boiler tubes, flue gas desulfurization systems.

Waste Incineration: Combustion chambers and exhaust systems.

Material Testing:

• Mechanical Testing Such as Tensile of Area

• Hardness Test

• Chemical Analysis – Spectro Analysis

• Positive Material Identification – PMI Testing

• Flattening Test

• Micro and MacroTest

• Pitting Resistance Test

• Flaring Test

• Intergranular Corrosion (IGC) Test

Nuclear power industry:

PWR steam generator heat transfer tubes and primary circuit main pipelines.

Highly radioactive liquid delivery system for nuclear waste reprocessing equipment.

Chemical and petrochemical:

Ethylene cracking furnace convection section furnace tubes and sulfuric acid alkylation reactor internal components.

Molten salt energy storage system (such as sodium nitrate/potassium) high temperature pipelines.

Environmental energy:

Gas waste heat recovery pipelines for waste incinerators (resistant to HCl/dioxin corrosion).

Supercritical CO₂ power generation unit high temperature and high pressure pipelines.