430 Stainless Steel Sheet
430 Stainless Steel Sheet is a common ferritic stainless steel, with the national standard designation 06Cr17. It is nickel-free and contains approximately 17% chromium.
It has better rust resistance than 439, is more economical, and has good cold stamping and bending forming properties; however, its resistance to intergranular corrosion is average, and it is prone to corrosion problems after welding. Its resistance to high temperatures, acids, alkalis, and chloride ion corrosion is relatively weak.
It has better rust resistance than 439, is more economical, and has good cold stamping and bending forming properties; however, its resistance to intergranular corrosion is average, and it is prone to corrosion problems after welding. Its resistance to high temperatures, acids, alkalis, and chloride ion corrosion is relatively weak.
439 is a titanium-stabilized ferritic stainless steel, with the national standard designation 06Cr18Ti. It has a slightly higher chromium content than 430 and adds titanium to refine its microstructure.
Compared to 430, it offers significantly improved resistance to intergranular corrosion, high-temperature oxidation, and thermal fatigue. It also has better weldability, is less prone to cracking and failure under hot conditions, and has stronger resistance to water vapor corrosion. It is mainly used in medium-temperature applications such as automotive exhaust components, water heaters, boiler components, high-temperature flues, and outdoor heat-resistant pipe fittings.
Comparison Table of Key Differences between 430 and 439 Stainless Steel Plates
|
Comparison Items |
430 Stainless Steel Sheet |
439 Stainless Steel Plate |
|
National Standard Grade |
06Cr17 |
06Cr18Ti |
|
Core Components |
17% Chromium, Nickel-free, Titanium-free |
18% Chromium, with added titanium, nickel-free |
|
Intergranular Corrosion Resistance |
Generally, prone to intergranular corrosion failure after welding |
Excellent, titanium stabilizes the metallographic structure, effectively preventing intergranular corrosion |
|
High-Temperature Oxidation/Thermal Shock Resistance |
Generally, only suitable for room temperature to low temperature thermal environments |
Good, can withstand medium-temperature conditions for a long time, strong resistance to thermal fatigue and cracking |
|
Welding and Processing Performance |
Can be simply cold-worked, difficult to weld, post-weld performance is unstable |
Excellent weldability, adaptable to various welding processes, stable post-weld performance |
|
Overall Corrosion Resistance |
Moderately suitable, only suitable for dry, room temperature, weakly corrosive environments |
Good, significantly better resistance to water vapor and high-temperature oxidation corrosion than 430 |
|
Core Applicable Scenarios |
Interior decoration, kitchenware panels, general hardware, room temperature dry conditions |
Automotive exhaust components, water heater/boiler components, high-temperature flues, outdoor heat-resistant pipe fittings, medium-temperature conditions |
|
Market Price Positioning |
Economical, lower price, high cost-performance ratio for basic applications |
Mid-to-high-end heat-resistant type, priced slightly higher than 430, suitable for more demanding heat-resistant conditions |
Stainless steel plate manufacturers remind you: 430 is a basic, economical ferritic stainless steel, primarily designed for low-cost applications in room-temperature, dry environments; 439 is a titanium-stabilized upgraded version, significantly improving resistance to intergranular corrosion, high-temperature resistance, and weldability compared to 430, making it the preferred material for medium-temperature thermal applications and outdoor heat-resistant applications.
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