ASTM B622 / ASME SB622 Hastelloy C22 (UNS NO6022 ) Seamless Tube, Heat Exchanger /Boiler Application

ASTM B622 / ASME SB622 Hastelloy C22 (UNS NO6022 ) Seamless Tube， Heat Exchanger /Boiler Application

also known as ， is a versatile austenitic nickel-chromium-molybdenum-tungsten alloy with enhanced resistance to pitting， crevice corrosion and stress corrosion cracking. The high chromium content provides good resistance to oxidizing media while the molybdenum and tungsten content give good resistance to reducing media. This nickel steel alloy also has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions. Other corrosives has resistance to are oxidizing acid chlorides， wet chlorine， formic and acetic acids， ferric and cupric chlorides， sea water， brine and many mixed or contaminated chemical solutions， both organic and inorganic. This nickel alloy also offers optimum resistance to environments where reducing and oxidizing conditions are encountered in process streams. This is beneficial in multi- purpose plants where such “upset” conditions occur frequently.

这种镍合金可防止在焊接热影响区形成晶界析出物，因此适用于大多数焊接状态下的化学加工应用。

should not be used in service temperatures above 1250° F due to the formation of detrimental phases which form above this temperature.

What are the characteristics of Hastelloy C-22?

• 抗点蚀、缝隙腐蚀和应力腐蚀开裂
• 对还原性和氧化性介质都有出色的耐受性
• 对氧化性水介质具有出色的耐受性
• 具有出色的耐各种化学加工环境的能力，包括铁酸、醋酸酐等强氧化剂以及海水和盐水溶液
• 防止在焊接热影响区形成晶界析出物
• 出色的焊接性

化学成分， %

In what applications is Hastelloy C-22 used?

• Pharmaceutical industries use alloy C-22 fittings and tubing to avoid contamination caused by corrosion related failures
• 玻璃纸制造
• 氯化系统
• 农药生产
• 焚烧洗涤系统
• 化学加工工业中的设备，如烟气洗涤器、氯化系统、二氧化硫洗涤器、纸浆和纸张漂白厂、酸洗系统和核燃料后处理等
• 废水处理

Fabrication of

虽然冷加工可以形成足够的韧性，但由于加工硬化，可能需要进行中间退火。锻造应在华氏 1750-2050 度之间进行，然后快速冷却。退火可在 2020-2150 华氏度之间进行，然后快速淬火。加速冷却可避免在华氏 1400 至 1800 度之间形成有害相。

ASTM 规格

机械性能
退火材料的典型室温拉伸性能