RS-2 (0Cr20Ni26Mo3Cu3Si2Nb)

RS-2 sulfuric acid resistant stainless steel is a Cr Ni Mo Cu austenitic stainless steel gradually evolved in the past 60 years. The characteristic of this steel is to improve the corrosion resistance of stainless steel in sulfuric acid and other media by using the complex effect of trace elements to improve the performance of stainless steel passive film without increasing the total amount of alloy.

Equivalent Grades


Chemical Composition, %


Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM A182
Plate, Sheet and StripASTM A312
Pipe and TubeASTM A167, 240
Welding Product
OthersASTM A403


This is an austenitic stainless steel with low alloy content and good corrosion resistance


The castings of plate heat exchanger, wire mesh demister and acid resistant pump made of this material are widely used in sulfuric acid, phosphoric acid and phosphate fertilizer industries.