The 400 series stainless steels comprise martensitic or ferritic alloys characterized by virtually nickel-free compositions, elevated carbon content, and inherent magnetic properties.

430

Grade 430 stainless steel is a nickel-free ferritic alloy offering cost-effective corrosion resistance for indoor appliances, architectural trim, and automotive trim where high formability and magnetic permeability are required.

Item
C%
Si%
Mn%
P%
S%
Cr%
Ni%
Min
---
---
---
---
---
16.00
---
Max
0.12
0.75
1.00
0.040
0.030
18.00
0.60

420

Grade 420 stainless steel is a hardenable martensitic alloy achieving 50+ HRC after heat treatment, primarily deployed for cutting instruments, surgical tools, and wear-resistant mechanical components requiring high hardness and moderate corrosion resistance.

Item
C%
Si%
Mn%
P%
S%
Cr%
Ni%
Min
0.16
---
---
---
---
12.00
---
Max
0.25
1.00
1.00
0.040
0.030
14.00
1.00

410

Grade 410 stainless steel is a versatile martensitic alloy hardened to 40+ HRC by heat treatment, extensively used for valve components, pump shafts, and cutting blades requiring balanced corrosion resistance and mechanical strength in moderate environments.

Item
C%
Si%
Mn%
P%
S%
Cr%
Ni%
Min
---
---
---
---
---
11.50
---
Max
0.15
1.00
1.00
0.040
0.030
13.50
0.60

409L

Grade 409L is an ultra-low carbon ferritic stainless steel (≤0.03% C) with titanium stabilization, delivering exceptional corrosion resistance, elevated-temperature strength, and superior fabrication properties essential for automotive exhaust systems and similar thermal applications.

Item
C%
Si%
Mn%
P%
S%
Cr%
Ni%
Ti%
Min
---
---
---
---
---
10.50
---
0.15
Max
0.03
1.00
1.00
0.040
0.030
11.75
0.6
0.50
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