Ferritic Stainless Steel 409L, 430, 439, 441 & 444
| Grade | Q/JPGBXG | GB/T 3280 | JIS G 4305/4312 | ASTM A240/A240M | EN 10088-2 |
| 409L | J409L | 022Cr11Ti | SUH409L | S40920 | X2CrTi12(1.4512) |
| 409M | J409M | 022Cr11NbTi | – | S40945 | – |
| 430 | J430 | 1Cr17 | SUS430 | S43000 | 430Si5 |
| 436L | J436L | 019Cr18MoTi | SUS436L | – | X2CrMoTi17-1(1.4513) |
| 439 | J439 | 022Cr18Ti | SUS430LX | S43035，439 | X2CrTi17(1.4510) |
| 439M | J439M | 022Cr17NbTi | – | – | – |
| 441 | J441 | 022Cr18Nb | – | S43940 | X2CrTiNb18(1.4509) |
| 444 | J444 | 019Cr19Mo2NbTi | SUS444 | S44400,444 | X6CrMoTi18-2(1.4521) |
| 442 | J442D | 019Cr18CuNb | SUS430J1L | S44200 | – |
| 443 | J443 | 019Cr21CuTi | SUS443J1 | S44330 | 1.4621 |
| 445 | – | 019Cr23Mo2Ti | SUS445J2 | S44536 | – |
Ferritic Stainless Steel Grades at a Glance
Ferritic stainless steels are chromium-containing stainless steels with a ferritic microstructure. They are widely used where corrosion resistance, formability, thermal performance and cost efficiency are important.
Common grades supplied by JISCO JUDE include 409L, 430, 436L, 439, 441 and 444. Grade selection should be based on corrosion environment, operating temperature, forming requirements, welding conditions, surface requirements and applicable standards.
409L vs 430 vs 439 vs 441 vs 444 Ferritic Stainless Steel
The following table gives a general comparison of major ferritic stainless steel grades. Final material selection should be confirmed according to the actual application, design conditions and applicable specifications.
| Grade | General Positioning | Typical Applications |
|---|---|---|
| 409L | Heat-resistant ferritic grade commonly used in automotive exhaust systems | Exhaust components, mufflers and hot-end automotive parts |
| 430 | General-purpose ferritic stainless steel | Appliances, decorative components, kitchen equipment and general fabrication |
| 436L | Mo-alloyed ferritic grade with improved corrosion resistance | Automotive exhaust, heat-resistant and corrosion-sensitive components |
| 439 | Stabilized ferritic stainless steel with good formability and weldability | Automotive exhaust, heat exchangers, appliances and fabricated components |
| 441 | Nb/Ti-stabilized ferritic grade for elevated-temperature applications | Automotive exhaust, thermal components and industrial fabrication |
| 444 | Higher-alloy ferritic grade with improved resistance to localized corrosion | Water systems, heat exchangers, tanks and corrosive service environments |
JISCO ferritic stainless steel products are used in automotive exhaust and related industrial applications.
Material qualification, grade, specification and customer approval requirements vary by project. Buyers can provide the required automotive specification or technical standard for material review.
Supporting material documentation and applicable qualification information can be reviewed according to specific project requirements.
Ferritic stainless steels can provide good formability, weldability and resistance to stress-corrosion cracking, depending on grade and service conditions.
Low carbon and nitrogen levels, together with Ti and/or Nb stabilization in selected grades, can improve weldability and resistance to intergranular corrosion.
Performance varies by grade. 409L, 439 and 441 are widely used for automotive and elevated-temperature applications, while grades such as 444 provide higher corrosion resistance for water and heat-exchanger service.
Ferritic stainless steels are used in applications where corrosion resistance, thermal performance, formability and material cost must be balanced.
Typical applications include automotive exhaust systems, heat exchangers, household appliances, water systems, refrigerated containers, architectural components and industrial equipment.
Grade selection should consider operating temperature, corrosion environment, forming and welding requirements, surface condition and applicable specifications.
Need 409L, 439 or 441 for Automotive Exhaust?
Send us your required grade, thickness, width, surface finish, quantity and destination. Our team can review material availability, processing requirements and quotation.
| Grade | Chemical compositions | Mechanical Property | ||||||||
| C% | Cr% | Mo% | Ti% | Nb% | N% | Yield strength/MPa | Tensile strength/MPa | Elongation/% | Hardness HV | |
| 409L | 0.0064 | 11.38 | 0.26 | 0.0063 | 217 | 392 | 40.5 | 120 | ||
| 436L | 0.005 | 17.69 | 0.84 | 0.25 | 0.0097 | 298 | 453 | 36.5 | 143 | |
| J441 | 0.0094 | 17.8 | 0.18 | 0.43 | 0.0064 | 308 | 470 | 34.5 | 141 | |
| 444 | 0.006 | 18.37 | 1.92 | 0.21 | 0.22 | 0.0085 | 325 | 487 | 33 | 157 |
| J442D | 0.025 | 20 | 0.6 | 0.025 | 210 | 395 | 24 | 200 | ||
| 439 | 0.008 | 17.64 | – | 0.33 | 0.008 | 277 | 443 | 35 | 136 | |
| 443 | 0.009 | 20.55 | – | 0.33 | 0.009 | 312 | 460 | 34 | 147 | |
| 445 | 0.008 | 22.27 | 1.63 | 0.41 | 0.01 | 347 | 500 | 31 | 165 | |
Note: The chemical composition and mechanical property values shown above are representative product data and should not be treated as guaranteed values for every order. Final requirements should be confirmed according to the applicable standard, purchase specification and material certificate (MTC).
Frequently Asked Questions About Ferritic Stainless Steel
What is ferritic stainless steel?
Ferritic stainless steel is a chromium-containing stainless steel with a predominantly ferritic microstructure. Different grades provide different combinations of corrosion resistance, heat resistance, formability and weldability.
What is the difference between 409L, 439 and 441 stainless steel?
409L is commonly used for automotive exhaust applications where heat resistance and cost efficiency are important. 439 is a stabilized ferritic grade with improved corrosion resistance and good forming and welding characteristics. 441 is Ti/Nb-stabilized and is commonly considered for elevated-temperature and automotive exhaust applications.
When should I use 444 instead of 430 stainless steel?
444 contains molybdenum and is generally selected when higher resistance to localized corrosion is required, particularly in water systems and heat-exchanger applications. Final grade selection should consider the actual environment and applicable specification.
Which ferritic stainless steel grades are commonly used for automotive exhaust systems?
409L, 436L, 439 and 441 are among the ferritic grades commonly considered for automotive exhaust components. The appropriate grade depends on component location, operating temperature, corrosion exposure, forming requirements and customer specification.
Can JISCO JUDE supply ferritic stainless steel coil and sheet?
Material availability can be reviewed according to the required grade, thickness, width, surface condition, quantity and applicable standard. Processing requirements such as slitting and cut-to-length can also be evaluated with the inquiry.
What information should I provide for a ferritic stainless steel quotation?
Please provide the grade, thickness, width, product form, surface finish, quantity, applicable standard and destination. For automotive projects, include any customer-specific specification or qualification requirements.
