1.Introduction

904L (N08904,14539) super austenitic stainless steel contains 14.0-18.0% chromium, 24.0-26.0% nickel

and 4.5% molybdenum.904L super austenitic stainless steel is a kind of low carbon, high nickel and

molybdenum austenitic stainless steel.It has good activation and passivation conversion ability, excellent

corrosion resistance, good corrosion resistance in non-oxidizing acids such as sulfuric acid, acetic acid,

formic acid, phosphoric acid, good pitting corrosion resistance in neutral chloride ion medium, and good

resistance to crack corrosion and stress corrosion.Used in various concentration of sulfuric acid under

70 ℃, under ordinary conditions of any acetic acid concentration, any temperature, resistance and

formic acid and acetic acid in mixed acid corrosion resistance is also very good.

2.Chemical composition

3.Mechanical property

* petroleum and petrochemical equipment, such as reactors in petrochemical equipment, etc.

Storage and transportation equipment for sulfuric acid, such as heat exchangers.

* power plant flue gas desulfurization device, the main use parts are: absorption tower tower body,

flue, door plate, internal parts, spray system.

Scrubber and fan in organic acid treatment system.

* seawater treatment equipment, seawater heat exchanger, paper industry equipment, sulfuric acid,

nitric acid equipment, acid making, pharmaceutical industry and other chemical equipment, pressure

vessels, food equipment.

* pharmaceutical factory: centrifuge, reactor, etc.

* plant foods: soy sauce, cooking wine, salt shakers, equipment and dressings.

* for dilute sulfuric acid strong corrosive medium 904L is the matching steel.