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Stainless Steel 409

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Description

Stainless Steel 409 ,UNS S40900, SS 409 Chemical Composition

Fe, <0.08% C, 10.5-11.75% Cr, <0.5% Ni, <1.0% Mn, <1.0% Si, <0.045% P, <0.03% S, 6x%C-0.75% Ti

What is SS 409 stainless steel

SUS409 stainless steel is a Ferritic steel that offers good mechanical properties and high-temperature corrosion resistance. It is commonly considered as a chromium stainless steel, with applications in exhaust systems of automobiles and applications that demand weldability.

SUS409 steels are also available in highly stabilized forms, such as grades S40930, S40920 and S40910. The stability of these grades is provided by the presence of niobium, titanium, or both, in the composition of steels.

 

UNS S40900 Properties

Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min             Hardness
Rockwell B (HR B) max Brinell (HB) max
SS 409 450 240 25 75 131

Physical Properties

Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (μm/m/°C) Thermal Conductivity (W/m.K) Specific Heat 0-100°C (J/kg.K) Electrical Resistivity (nΩ.m)
0-100°C 0-315°C 0-538°C at 100°C at 500°C
SS409 7800 200 11.0 11.7 12.4 25.8 27.5 460 600


Grade Specification Comparison

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
SS409 S40900 409S19 – 1.4512 X6CrTi12 – SUH 409

 

Possible Alternative Grades

Grade Properties
3CR12  Easy to weld and good corrosion resistance. Heavy sections are more easily     available when compared to 409.
SUS304  High heat resistance and corrosion resistance. Grade 304 is expensive.
SUS321  Better heat resistance when compared to 304 or 409.
Aluminized steel  Cheaper than grade 409 stainless steel, but less resistant to exhaust gases.
What is the difference between 409 and 304 stainless steel?
sus304 is an austenitic stainless steel high in chromium and nickel with very high corrosion resistance. It is one of the most commonly produced and used stainless steel grades 409 is a ferritic stainless steel with less chromium and very little nickel.
What is the difference between 316 and 409 stainless steel?
sus409 is a less costly option for stainless steel and a lower grade. … ss409 offers less protection than stainless steel 304 and 316 stainless steel, but the lower price is an advantage to many customers.
 
How good is 409 stainless steel in Corrosion Resistance ?
Type 409 stainless steels have excellent resistance to exhaust gas and atmospheric corrosion, superior to that of 410 martensitic grades with 12% chromium and 3CR12. However, the corrosion resistance is lower than that of grade 430 steels containing 17% chromium.
What is the difference between 409 and 410 stainless steel?
Type 409 is a heat resisting ferritic stainless steel providing good oxidation and corrosion resistance compared to carbon steel. … The corrosion resistance of Type 409 is better than coated carbon steel, similar to that of Type 410 stainless steel, and less than that of Type 304/304L stainless steel.

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