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STAINLESS STEEL 409 - ALLOY COMPOSITION

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Stainless Steel 409

Related Metals:

No Related Metal names.                                     

Specifications:

AISI 409
ASTM A176
ASTM A240
ASTM A268
ASTM A791
ASTM A803
DIN 1.4512
DIN 1.4720
UNS S40900

Chemistry Data

Carbon

0.08 max

Chromium

10.5 - 11.75

Iron

Balance

Manganese

1 max

Nickel

0.5 max

Phosphorus

0.045 max

Silicon

1 max

Sulphur

0.045 max

Titanium

Min:6xC

General Information

Principal Design Features

409 is an alloy designed principally for the automotive exhaust industry, although it has been used successfully in other industrial applications. It combines good elevated temperature corrosion resistance with medium strength, good formability and overal


Applications

Automobile mufflers, catalytic converters, tailpipes, farm equipment, structural supports and hangers, transformer cases, diamond tread plate and shipping containers.


Machinability

Machining this alloy produces tough, draggy chips with heavy build-up. While this alloy can be machined in the annealed condition, it tends to perform better in the cold drawn or heat treated condition.


Forming

This alloy is quite ductile in the annealed condition and can be easily formed using all commonly employed practices. Experienced fabricators report that it is similar in formability to soft carbon steel.


Corrosion Resistance

409 is designed to suitably resist the attack of internal combustion engine condensates in both liquid and vapor phases. It is similar in corrosion resistance to 410 stainless. It will form surface rust rapidly, so is not recommended for applications wher


Welding

Can be successfully welded employing SMA, GMA and GTA processes. When not used in a high temperature environment, filler metal AWS ER309 is acceptable for use. For stronger, more resilient welds at high temperature, use weld filler such as 409 Cb, AWS ER4


Hot Working

Heat to 1500-1600 F(816-871 C) then rapidly heat to 1900-2050 F(1038-1121 C). Do not soak at this temperature and do not work at temperatures below 1500 F(816 C). Air cool forgings.


Cold Working

Despite a rather low work hardening rate, this alloy can be easily formed using most common methods.


Annealing

Soak material at 1200-1400 F(649-760 C) and air cool.


Hardening

This alloy is not hardenable by heat treatment.


Physical Data

Density (lb / cu. in.)

0.278

Specific Gravity

7.68

Specific Heat (Btu/lb/Deg F - [32-212 Deg F])

0.11

Modulus of Elasticity Tension

29

Mechanical Data

Form

Sheet

Condition

Test Specimen Annealed

Temper

70

Tensile Strength

68

Yield Strength

39

Elongation

30


Form

Sheet

Condition

Test Specimen Annealed

Temper

200

Tensile Strength

58

Yield Strength

28

Elongation

28


Form

Sheet

Condition

Test Specimen Annealed

Temper

400

Tensile Strength

53

Yield Strength

24

Elongation

21


Form

Sheet

Condition

Test Specimen Annealed

Temper

600

Tensile Strength

50

Yield Strength

22

Elongation

20


Form

Sheet

Condition

Test Specimen Annealed

Temper

800

Tensile Strength

46

Yield Strength

19

Elongation

22


Form

Sheet

Condition

Test Specimen Annealed

Temper

1000

Tensile Strength

36

Yield Strength

16

Elongation

28


Form

Sheet

Condition

Test Specimen Annealed

Temper

1200

Tensile Strength

23

Yield Strength

13

Elongation

34


Form

Sheet

Condition

Test Specimen Annealed

Temper

1300


Form

Sheet

Condition

Test Specimen Annealed

Temper

1400

Tensile Strength

8

Yield Strength

4

Elongation

68


Form

Sheet

Condition

Test Specimen Annealed

Temper

1500


Form

Sheet

Condition

Test Specimen Annealed

Temper

1600

Tensile Strength

4

Yield Strength

2

Elongation

79

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