Came across this bit of information while the mutt was out having a wiz. 400 series stainless. This would explain why cutting off catalytics with the sawzall plays havoc with the blades.
In the beginning I was using 14 tpi blades but have now switched over to 10 tpi with faster cutting with longer blade life.
409 is a titanium stabilized ferritic stainless steel. Although regarded as a general-purpose chromium stainless steel the primary application for Grade 409 is automotive exhaust systems.
Corrosion Resistance
Grade 409 resists atmospheric and exhaust gas corrosion. A light surface rust will form in most atmospheres; this rust retards further corrosion but makes the surface undesirable for decorative applications. The corrosion resistance is about the same as that of 3CR12 and the 12% chromium martensitic grades such as 410, and inferior to the 17% chromium grade 430.
Heat Resistance
Generally 409 is classified as resistant to scaling in intermittent service up to 815°C and up to 675°C in continuous service, but these temperatures are dependent upon the exact service environment.
Typical applications include:
• Automotive exhaust systems
• Catalytic converters
• Mufflers
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