Inconel Seamless Tube ASTM B163 Alloy 825 UNS NO8825 Oil Refineries Application

Inconel Seamless Tube ASTM B163 Alloy 825 UNS NO8825 Oil Refineries Application

概述

Incoloy 825 is highly resistant to corrosion. It has a high nickel content， sufficient to resist chloride ion stress corrosion cracking， and a very stable austenite structure. The levels of molybdenum and copper enable the alloy to resist reducing agents and acids. Chromium gives resistance to oxidising conditions， such as nitric acid solutions， nitrates and oxidising salts. The alloy is titanium stabilised to resist pitting and intergranular attack after fabrication， particularly welding， which includes heating in the critical sensitisation temperature range (650°C – 760°C). Alloy 825 offers exceptional resistance to corrosion by sulphuric and phosphoric acids and is often the most cost effective alloy in sulphuric acid service.

"(《世界人权宣言》) characteristics of ASTM B163 Alloy 825 UNS NO8825

• 对还原性和氧化性酸具有出色的耐受性
• Good Mechanical Properties at both room and elevated temperatures up to approximately 1020° F
• 良好的抗应力腐蚀开裂性能
• Permission for pressure-vessel use at wall temperatures up to 800°F
• Satisfactory resistance to localized attack like pitting and crevice corrosion

耐腐蚀性

Alloy 825 is a general purpose engineered nickel alloy with high resistance to corrosion by acids and alkali metals in oxidizing and reducing environments， and the nickel component gives the alloy effective resistance to stress corrosion cracking. Corrosion resistance is excellent in a variety of media such as sulfuric， phosphoric， nitric and organic acids， alkali metals such as sodium hydroxide corrosive， potassium hydroxide and hydrochloric acid corrosive solutions.

Alloy 825 is resistant to boiling sulfuric acid up to a concentration of 40% and to all concentrations of sulfuric acid up to a concentration of 60% at temperatures up to 80°C and corrosion up to 66°C. 825 has very good corrosion resistance to various concentrations of phosphoric acid.

It has good resistance to chloride-containing solutions， pitting in seawater， and stress corrosion. In addition， the intergranular corrosion also has good corrosion resistance.

The high overall performance of alloy 825 is demonstrated in nuclear combustion dissolvers with a wide variety of corrosive media， such as sulfuric acid， nitric acid and sodium hydroxide all handled in the same equipment.

Chemical Composition of ASTM B163 Alloy 825 UNS NO8825

Mechanical Strength of Astm B163 Alloy 825 UNS NO8825

Physical properties of ASTM B163 Alloy 825 UNS NO8825

Astm B163 Alloy 825 UNS NO8825

• 工业炉
• 热处理设备
• 化学和石化加工
• 发电厂的过热器和再热器
• 压力容器
• 热交换器
• Oil Refineries