443 Stainless Steel Sheet
443 stainless steel sheet uses a nickel-free formulation, reducing costs (approximately 20-30% lower than 304). Its corrosion resistance and machinability are close to 304, and its resistance to intergranular corrosion after welding is significantly better than 430/439.
443 stainless steel sheet is a high-chromium-titanium stabilized ferritic stainless steel, with the national standard grade 019Cr21CuTi (also known as 21CT). It belongs to the 400 series nickel-free economical stainless steel sheet category and is an upgrade from 430/439, primarily serving as a replacement for 304 stainless steel.
Key differences between 443 and 430/439 stainless steel:
|
Comparison Items |
443 Stainless Steel |
430 Stainless Steel |
439 Stainless Steel |
|
National Standard Grade |
019Cr21CuTi |
06Cr17 |
06Cr18Ti |
|
Chromium Content |
21% |
17% |
18% |
|
Stabilizing Elements |
Ti+Cu |
None |
Ti |
|
Corrosion Resistance Grade |
Similar to 304 |
Basic Grade |
Medium Grade |
|
Welding Performance |
Excellent (stable corrosion resistance after welding) |
Poor Quality (Prone to Post-Weld Corrosion) |
Good |
|
Price Positioning |
Mid-to-high-end ferritic |
Economy Type |
Medium Grade |
|
Alternative Applications |
Can directly replace 304 |
For Room Temperature Drying Only |
Medium Temperature Thermal Application |
Usage limitations:
Not suitable for extreme corrosive environments such as strong acids and alkalis, high chloride ion concentrations (e.g., seawater), high temperature and high pressure.
Plasticity and toughness are slightly lower than 304, limiting deep-drawing capabilities.
Prolonged use in the 500-800℃ range should be avoided to prevent embrittlement.
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