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A quick read gives the necessary information. Interestingly, cast iron is not truly pure iron. In fact, a simple steel may be closer to pure iron than than is cast iron. The difference is that steel has a carbon content of less than 2.1% by weight. More carbon makes the mix harder, more brittle, so less ductile. Cast iron contains MORE carbon than that rough ...

Removing the old pipe First you want to make sure the section of pipe that will remain, is properly supported (you don't want it falling). Then you'll want to install some temporary supports, to catch the portion of the pipe that you'll be removing. Use a chain cutter, hammer and cold chisel, or grinder to break the pipe a few inches before the hub on the ...

Why is it rotten? Does it bode ill for the rest of the system? I would replace as much cast as is easily doable with ABS. I would cut above and below where the K sink drain comes in and replace everything back to the sink with ABS. Is there a particularly good sawzall blade for this? Standard metal blade will do - I just cut a 4" myself no ...

For cutting the pipe, go rent a chain pipe cutter (aka soil pipe cutter). It will make short work of the pipe and not be too messy. It will make a clean enough edge that a Fernco coupling (like you have a picture of) will work fine. Obviously you will need to add some strapping to secure the horizontal run of iron pipe if you go this route because you ...

A silicon based glue should be able to withstand these temperatures. Makes sure to verify the max temp on the package. Silicon glue

DIY cutting cast iron is pretty easy, but it's a little counter-intuitive. Cast iron is extremely brittle compared to steel. That's important for how you approach it. Cutting it with a sawzall blade is going to be very slow and frustrating. I think the best choice of blade would be along the lines of the diamond-grit "friction" blades, but any sawzall ...

Remember, cast iron is brittle. A chain-breaker does not actually cut it, it cracks and separates it. You can use the same principle: use the angle grinder make a groove to weaken material around the perimeter of the material right where you want it to break. Then allow the grinding wheel to penetrate all the way through at only a single spot (a 1/4" or ...