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SS 301
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An austenitic stainless
steel, which because of its ability to attain high strength and ductility
through moderate or serve cold working, can be used for automobile trims,
conveyor belts, transportation cars such as railway coaches, metal fixtures
for construction purposes, roof drainage products, strong door frames
and tableware.
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SS 304
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It is the most widely
used austenitic stainless steel. Popularly known as 18/8 stainless steel,
it has excellent corrosion resistance and forming characteristics. Used
in chemical, petrochemical and fertilizer industries, and as equipment
in dairy, food processing, pharmaceutical industries, in hospitals, households
as kitchenware, cryogenic vessels and as heat exchangers in air conditioning
refrigeration, for machinery in paper, pulp and textile beverage sectors.
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SS 304L
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An austenitic stainless
steel similar to SS 304 with less carbon (0.03% max). It used in place
of SS304 for improved resistance to intergranular corrosion. It is used
for parts and structures which cannot be heat treated for stress relieving
after welding.
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SS 309/ SS 309S
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There are austenitic
stainless steels which are strong and tough. Because of their higher
nickel and chromium content, these are used for applications requiring
high scaling resistance. They find their use for air heaters, annealing
boxes, Chemical Composition oven equipment, boiler baffle plates carburising
boxes, chemical processing equipment, dryers, exhaust manifolds, furnace
parts, gas turbine parts, heat exchangers, jet engine parts, oil burner
parts, oven equipment, petroleum refining equipment, etc.
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SS 310/SS 310S
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These are austenitic
types with higher chromium and nickel content than 309/309S. Because of
their relatively high creep strength and mechanical properties at higher
temperatures these steels find their applications for higher temperatures
and severe service conditions. Used for air heaters annealing boxes, ovens
carurising boxes, fire box sheets, furnace linings, furnace stacks and
dampers, gas turbine parts, heat exchangers, kiln linings, nozzle diaphragm
assemblies for turbo jet engines, oil burners parts, paper mill equipment,
oil refinery equipment, recuperates and so on.
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SS 316
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An austenitic stainless
steel with 2.0 to 3% Mo. which improves corrosion. resistance and imparts
hot strength characteristics. Used for applications requiring resistance
to pitting corrosion. and in halogen atmospheres. Typical applications
: architectural trims, marine exteriors, chemical processing equipment,
food processing equipment, petroleum refining equipment, pharmaceutical
equipment, photographic equipment, pulp and paper processing equipment,
textile finishing equipment, etc.
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SS 316L
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An austenitic stainless
steel. Modification type SS 316 contain a maximum of 0.03 percent carbon)
with reduced tendency towards carbide precipitation without addition
of a stabilising element. Recommended for parts which cannot be heat
treated after welding.
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SS 317 / SS317L
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These are austenitic
stainless steels which are modifications of type SS 316 / SS 316L and
offer increased chromium, nickel and molybdenum ranges for improved
corrosion. resistance. The steels were developed to resist attack of
sumptuous acid compounds. They resist pitting in phosphoric and acetic
acids. Applications includes paper pulp handling equipment, process
equipment for producing photographic chemicals, bleaching solutions
and handling sulphurous, acetic, formic, citric and tartaric acids.
They have best corrosion. resistance to body acids and blood and are
recommended for surgical bone applications.
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SS 321
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An austenitic stainless
steel similar to SS 304 but stabilised with titanium to avoid inter-granular
corrosion. Type SS 321 resists scaling and vibration fatigue. It is
used for aircraft exhaust stacks and manifolds, pressure vessels, large
mufflers for diesel engines, carburetors, expansions belows, stack liners,
fire walls, etc.
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SS 347
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An austenitic stainless
steel similar to SS 321 but stablilised by Columbium which does not
appreciably reduce the overall corrosion. resistance. Recommended in
the range of 420 Degree Centigrade to 900 Degree Centigrade for parts
fabricated by welding and which cannot be subsequently annealed. Applications
include airplane exhaust stacks, welded tanks for chemicals, heat resistors,
jet engine parts, expansions bellows, etc.
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SS 409
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It is the lowest
alloyed straight Chromium ferritic stainless steel. It replaces carbon
steels where some amount of heat or corrosion. resistance and higher
strength are required and where appearances secondary. It is used for
fins in heater tubes, transformer and capacitor cases, dry fertilizer
spreaders, automotive exhaust systems including mufflers, resonators,
silencers, pipes and emission control units, high pressure agricultural
spray tanks, culverts, shipping containers and firm equipment.
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SS 410/410S
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SS 410 is the most
commonly used 12% Chromium martens tic stainless steel. Excellent combination
of toughness and strength can be developed through proper heat treatment.
This steel has better corrosion. resistance in the hardened condition.
It is a good choice when good formability and high strength are required
and the end use demands resistance to mildly corrosive environment.
It is used for furnace parts and burners operating below 650 Degree
Centigrade, micrometer parts, tray supports, caps and vaporizers in
petroleum fractionating towers, lining for reaction chambers, coal screens,
fishing tickles, keys, lamp brackets, rules and tapes, wall screens,
steam turbine buckets, blades, bucket covers, pump parts, petrochemical
equipment and press plates. Type SS410 S is a low carbon modification
of SS 410.
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SS 420
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This steel contains
min. 0.15 % C and 12% Cr. It can be thermally hardened to develop very
high strength. Extremely useful for cutlery. Other applications include
vegetable choppers, scissors, shears, tweezers, hand tools, dental and
surgical instruments, etc.
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SS 430
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SS 430 with 19%
Cr. is inferior to SS 304 as regards deep drawablity. Though it does
not have good corrosion resistance properties as Cr-Ni steels, it is
used under less corrosive atmospheres for chemical processing equipment,
furnace parts, heat exchangers, oil burner parts, petroleum refining
equipment, pyrometers, protection tubes, recuperates, rubber plant machinery,
scientific apparatus, storage vessels, tubing, television cones, electrical
appliances, solar water heaters, air conditioners, kitchenware, household
appliances, decorative trims, parts for washing machines etc.
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SS 434
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A ferritic stainless
steel similar to SS 430 but containing about Mo. It has better corrosion
resistance than SS 430. It is widely used for exterior automotive moulding
and trims and applications where improved corrosion. resistance to pitting
attack from various de-icing chemicals is required.
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