Stainless Steel Type 430
| |
Type 430 is a straight chromium, non-hardenable grade combining
good corrosion resistance and formability characteristics with
useful mechanical properties. Its ability to resist nitric acid
attack permits its use in specific chemical applications but
automotive trim represents its largest field of applications.
Type 434 and 436 are companion grades to Type 430.
|
Typical
Chemistry (% Maximum unless shown as a range)
|
| |
C
|
Mn
|
P
|
S
|
Si
|
Cr
|
Ni
|
| 430 |
.12 |
1.0 |
.040 |
.030 |
1.0 |
16.0 to 18.0 |
- |
| 430L |
.12 |
1.25 |
.040 |
.15 |
1.0 |
16.0 to 18.0 |
.60 (optional) |
Typical
Applications
| The list of applications for this general purpose
grade is extensive and includes: |
- Automotive trim
- Lashing Wire
- Element supports
|
- Stove trim rings
- Fasteners
- Chimney liners
|
Corrosion Resistance
Type 430 has excellent resistance to a wide variety of corrosive media.
Good resistance to salt water in northern waters, but less resistant
than Type 316 in tropical waters.
Heat Resistance
Resists scaling in intermittent service to 1700° F and in continuous
service to 1600° F
Heat Treatment
Annealing-heat to 1150 - 1225° F for 12 to 24 hours and air cool.
Hardening-hardened by heating to 1800 - 1900° F, quenching in oil
and tempering to suit mechanical requirements. See accompanying table
and chart.
Note: The tempering range 800 to 1100° F should be avoided.
Welding
A pre-heat of 500oF is recommended prior to welding. Type 410 filler
rod can be used, but Types 308, 309 or 310 will provide more ductile
welds. Post-weld anneal at 1150 - 1225oF.
Typical Mechanical Properties
Annealed
Yield
Strength .2% Offset
(PSI) |
Ultimate Strength
(PSI) |
Elongation (% in 2")
|
Hardness
(RB) |
Hardness
(BHN) |
Impact IZOD
(ft/lbs) |
Modulus of Elasticity
in Tension
(PSI) |
| 95000 |
125000 |
20 |
103 |
262 |
40 |
29.0
x 106 |
