Stainless steel has been a preferred material in railway applications worldwide on account of its longer life, higher strength to-weight ratio, aesthetic appearance & corrosion resistance. Its durability and minimal maintenance requirements makes stainless steel a better choice economically. Benefitted by energy saving lightweight design and 100% recyclability at the end of service life, stainless steel can be qualified as environmental friendly material. Bright contemporary finish of stainless steel has further strengthened the applicability of stainless steel in rail industry. In addition, stainless steel does not require protective paint coatings which further reduce maintenance cost.
Many stainless steel grades are in use in railways operations today. Austenitic stainless steel grades 301LN, 201, 301, 201LN and 304 have been used in the construction of railway coaches, while ferritic stainless steel 409M/IRSM 44 97 and Nitronic 30 have been used for freight wagons.
Various austenitic stainless steel of chrome-nickel and chrome-manganese varieties, chemical composition and mechanical properties listed below, have been used for manufacture of passenger trains and metros.
|Jindal Designation||UNS||%C (max.)||%Mn (max.)||%Si (max.)||%Cr||%Ni||%N (max.)||%Cu||others|
|J 201||S20100||0.15||5.5 - 7.5||1.00||16-18||3.5-5.5||0.25||-||-|
|J 201L||S20103||0.030||5.5 - 7.5||0.75||16-18||3.5-5.5||0.25||-||-|
|IA 201||0.15||15 min.||-||14.5 min.||1 max||0.25||-||-|
|J 204Cu||S20430||0.10||6.50-9.00||0.75||16 -17.5||1.5-3.5||0.10 - 0.25||1.50 – 3.50||-|
|S42035||0.08||1||1||13.5-15.5||1.0-2.5||-||-||Mo 0.2-1.2, Ti 0.3-0.5|
|Jindal Designation||UNS||U.T.S (Mpa) (min.)||0.2% Y.S (Mpa) (min.)||% Elongation in 50mm, (min.)||Hardness HRB (max.)|
These steels develop very high strength coupled with good formability in cold rolled tempers and constitute ideal material for structural components. The exceptional strength to weight ratio and energy absorption capacity enables the designers to reduce weight and enhance crash worthiness while ensuring longer life span due to superior corrosion resistance.
For more details download brochure