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400 Series 409L Cold Rolled Stainless Steel Coil Roll Corrosion Resistance
Alloy 409 is a general purpose, chromium, titanium stabilized, ferritic stainless steel whose primary application is automotive exhaust systems. It contains 11% chromium which is the minimum amount for the formation of the passive surface film which gives stainless steels their corrosion resistance. It combines good elevated temperature corrosion resistance with medium strength, good formability, and overall cost. Alloy 409 resists corrosion strongly compared to carbon steel and is used as an alternative to carbon steel in mildly challenging environments where its high resistance to corrosion and high temperature oxidation gives an advantage. It is commonly used in applications where appearance is a secondary quality to mechanical properties and corrosion resistance.
Products Details
1. Chemical Composition
| Specification | Grade | Chemical Composition(wt%) | ||||
| C | Mn | Cr | Other | |||
| JIS | SUS409L | ≤0.03 | ≤1.0 | 10.50-11.75 | Ti 6*C~0.75 | |
| JIS | SUS429 | ≤0.12 | ≤1.0 | 14.00-16.00 | - | |
| JIS | SUS 436L | ≤0.025 | ≤1.0 | 16.00-19.00 | Ti,Nb,Zn 8*(C%+N%)-0.80 | |
| ASTM | S43932 | ≤0.03 | ≤1.0 | 17.00-19.00 | - | |
| EN | 1.4509 | ≤0.03 | ≤1.0 | 17.50-18.50 | Ti 0.1-0.6 | |
2. Properties
| Spec | Grade | Mechanical Property | Physical Property | ||||
Y.S (N/MM2) | T.S (N/MM2) | EL (%) | HRB | Specific Heat (J/g℃) | Modulus of Elasticity (KN/mm2) | ||
| JIS | SUS409L | ≥175 | ≥360 | ≥25 | ≤80 | 0.46 | 200 |
| JIS | SUS429 | ≥205 | ≥450 | ≥22 | ≤88 | 220 | |
| JIS | SUS 436L | ≥245 | ≥410 | ≥20 | ≤96 | 0.46 | 220 |
| ASTM | S43932 | ≥205 | ≥415 | ≥22 | ≤89 | 0.46 | 220 |
| EN | 1.4509 | ≥250 | 430-630 | ≥25 | ≤80 | 0.46 | 220 |
3. Surface Finish
| Surface Finish | Definition | Application |
| 2B | Those finished, after cold rolling, by heat treatment, pickling or other equivalent treatment and lastly by cold rolling to given appropriate luster. | Medical equipment, Food industry, Construction material, Kitchen utensils. |
| BA/8K mirror | Those processed with bright heat treatment after cold rolling. | Kitchen utensils, Electric equipment, Building construction. |
| NO.3 | Those finished by polishing with No.100 to No.120 abrasives specified in JIS R6001. | Kitchen utensils, Building construction. |
| NO.4 | Those finished by polishing with No.150 to No.180 abrasives specified in JIS R6001. | Kitchen utensils, Building construction, Medical equipment. |
| Hairline | Those finished polishing so as to give continuous polishing streaks by using abrasive of suitable grain size. | Building Construction. |
| NO.1 | The surface finished by heat treatment and pickling or processes corresponding there to after hot rolling. | Chemical tank, pipe. |
Applications
With excellent good corrosion resistance and elevated temperatures strength ,it can be widely used in making related parts of cars´Automative exhaust system ,such as Exhaust manifold,Catalytic converter,Muffler,etc.Furthermore,439 is also widely used in fields related to washing machines´inner barrel and elevator panel.
