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You are here: Home- NewsASTM A240 Martensitic 409 Stainless Steel Possible Alternative Grades

ASTM A240 Martensitic 409 Stainless Steel Possible Alternative Grades

Posted:2017/2/13 1:37:24

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409 Stainless Steel combines good elevated temperature corrosion resistance with medium strength, good formability, and overall cost. ASTM A240 Martensitic 409is commonly considered as a chromium stainless steel, with applications in exhaust systems of automobiles and applications that demand weld ability.

Key Properties of 409 Stainless Steel

ASTM A240 Martensitic 409 properties given below relate to annealed tubing of ASTM A268. The specified properties may not be similar to other products such as bar and coil.

Composition ranges of grade 409 stainless steels


Grade

C

Mn

Si

P

S

Cr

Ni

Ti

409

min.
max

-
0.08

-
1.00

-
1.00

-
0.045

-
0.045

10.5
11.75

-
0.5

6x C
0.75

Mechanical properties of grade 409 stainless steels


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

409

450

240

25

75

131

ASTM A240 Martensitic 409 Corrosion Resistance

Grade 409 stainless steels have excellent resistance to exhaust gas and atmospheric corrosion。  The surface of grade 409 steels is liable to mild corrosion, which limits the usage of steels for decorative purposes.

409 Steel Application

409 Stainless Steel has been successfully used in Automotive exhaust systems, Catalytic converters, Mufflers, Tailpipes, Farm equipment, Structural support and hangers, Transformer cases, Furnace components, Heat exchanger tubing

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