Inconel 690/UNS N06690/DIN 17752/DIN 17751/DIN 17750/Alloy 690 bar

Inconel alloy 690 bar, designated as UNS N06690 and conforming to DIN 17752, DIN 17751, and DIN 17750 standards for bar, sheet, and plate respectively, is a high-chromium nickel-based alloy specifically engineered for exceptional resistance to stress corrosion cracking and oxidation in high-temperature aqueous environments. This bar stock form serves as a critical raw material for machining components in nuclear power, chemical processing, and waste incineration industries where long-term reliability under corrosive conditions is paramount.

 

Overview of Inconel Alloy 690

Inconel 690 is an austenitic nickel-chromium-iron alloy developed as an enhanced version of Alloy 600. Its significantly higher chromium content (approx. 29%) dramatically improves its resistance to oxidizing media, sulfur-containing atmospheres, and most importantly, intergranular attack and stress corrosion cracking in high-temperature water. This makes the bar stock ideal for fabricating pressure vessel penetrations, heat exchanger tubesheets, and other structural components in demanding service.

Chemical Composition of Inconel Alloy 690

The superior corrosion resistance of Inconel 690 bar originates from its meticulously balanced chemistry. Shanghai NC Metal Materials Co., Ltd. supplies bar stock that strictly adheres to the compositional limits set by international specifications, ensuring consistent performance in critical applications.

Mechanical Properties of Inconel 690 Bar

Inconel Alloy 690 bar exhibits a good combination of strength and ductility, particularly in the annealed condition. Its mechanical properties are stable over a wide temperature range, making it suitable for high-pressure, high-temperature components.

Physical Properties of Inconel 690 Bar

The physical characteristics of Inconel 690 are essential for thermal, electrical, and mechanical design calculations in engineering applications. Its low thermal expansion coefficient is a notable feature.

Standard Specifications, Bar Forms, and Sizes

Shanghai NC Metal Materials Co., Ltd. supplies Inconel 690 bar in various forms, meeting a comprehensive set of international and industry-specific standards critical for nuclear and chemical applications.

Primary Applications of Inconel 690 Bar Stock

Machined from bar stock, Inconel 690 components are primarily used in: Nuclear Power Generation: Steam generator tubesheets, heater sleeves, penetration nozzles, and control rod drive mechanisms in pressurized water reactors (PWRs). Chemical & Petrochemical Processing: Components in nitric acid production, pickling tanks, and radioactive waste processing systems. Pollution Control: Structural parts in flue gas desulfurization (FGD) systems and waste incinerators.

Machining and Fabrication Notes for Bar Stock

Inconel 690 bar is machinable using techniques standard for austenitic nickel alloys, but its high work-hardening rate requires attention. Recommendations include: using rigid machine tools, sharp carbide or ceramic cutting tools with positive rake angles, moderate to low cutting speeds, and firm, continuous feed rates to avoid work hardening at the cut surface. High-pressure, copious coolant flow is essential for heat dissipation and chip removal.

Reference Pricing and Key Purchasing Factors

The price of Inconel 690 bar from Shanghai NC Metal Materials Co., Ltd. is influenced by its high nickel and chromium content, stringent manufacturing requirements for nuclear grades, and specific customer demands. Pricing is typically per kilogram and varies with order specifics.