| Feature
|
STS 410 Seamless
|
STS 439 Seamless
|
| Material Class
|
Martensitic Stainless Steel (High Strength & Hardness)
|
Ferritic Stainless Steel (Excellent Corrosion Resistance)
|
| Chemical Composition
|
Cr: 11.5% – 13.5%
· High Carbon content allowing heat treatment hardening
|
Cr: 17.0% – 19.0%
· Ti (Titanium) stabilized
for weld integrity
|
| Corrosion Resistance
|
Moderate (Suitable for mild environments)
|
Excellent
(High Cr content prevents oxidation/corrosion)
|
| Stress Corrosion Cracking (SCC)
|
Vulnerable to SCC and hydrogen embrittlement
|
Highly Resistant
(Ferritic structure provides immunity to SCC)
|
| Workability (Cold Drawing)
|
High hardness increases cold drawing difficulty
|
High ductility makes it ideal for seamless tube drawing
|
| Weldability
|
Poor (Prone to cracking, requires Post-Weld Heat Treatment)
|
Excellent
(Ti-stabilized, eliminates the need for PWHT)
|
| Estimated Price Level (per kg)
|
More Economical
(Approx. KRW 6,500 – 8,000)
|
Approx. 20% – 30% Higher
(Approx. KRW 8,500 – 10,500)
|
| Primary Applications
|
Valve parts, cutlery, fasteners, shafts, high-strength structural parts
|
Industrial Heat Exchangers, Boilers, Condensers |
Count : 150
