X2CrTi12
1.4512Titanium-stabilized ferritic stainless steel with 12% chromium, often called the muffler grade stainless steel. Ultra-low carbon (max 0.03%) with Ti stabilization prevents sensitization during welding. Excellent formability for stamped and deep-drawn components. Primary material for automotive exhaust systems (manifolds, catalytic converter housings, mufflers), hot water heaters, and welded tubes. Cost-effective alternative to austenitic grades. Service temperature up to 600°C.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 409 | S40900 | REF |
| 🇯🇵 | JIS | Japan | SUS 409 | — | 95% |
Sources: ASTM A240, JIS G4305
Chemical composition comparison (wt%)
Side-by-side: X2CrTi12 (EN) (EN 10088-2:2005) vs SUS 409 (JIS)
| Element | X2CrTi12 (EN) | SUS 409 (JIS) | Overlap |
|---|---|---|---|
| C | ≤ 0.03% | — | — |
| Si | ≤ 1% | — | — |
| Mn | ≤ 1% | — | — |
| P | ≤ 0.04% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | 10.5–12.5% | — | — |
| Ti | ≤ 0.65% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 380–560 | MPa |
| Yield Strength | ≥ 210 | MPa |
| Elongation | ≥ 25 | % |
| Hardness HB | ≤ 170 | HB |
| Density | ≥ 7.7 | g/cm3 |
| Elastic Modulus | ≥ 220 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| annealing | 750–850 °C | air | — | Not hardenable by heat treatment. Ferritic structure. |
Compatibility verdict
X2CrTi12 and SUS 409: 95% composition match
Close equivalents but NOT identical.
Related materials
304 Stainless Steel
1.4301The most widely used austenitic stainless steel. Excellent corrosion resistance, good formability and weldability. Standard choice for food processing, chemical, and architectural applications.
316L
1.4404Low-carbon austenitic stainless steel with molybdenum addition. Superior corrosion resistance to 304, especially against chlorides and pitting. Standard choice for chemical processing, marine, medical implants, and pharmaceutical equipment.
430 Stainless Steel
1.4016Ferritic chromium stainless steel with good corrosion resistance and formability. Lower cost than austenitic grades. Used for automotive trim, kitchen sinks, architectural panels, and appliance components.
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