For the pipe fitting like elbow, tee, union etc. which of the following is preferred?

For the pipe fitting like elbow, tee, union etc. which of the following is preferred?

         (a) Pig iron

         (b) Mallable iron

         (c) Spheroidal graphite iron

         (d) High carbon steel

For the pipe fitting like elbow, tee, union etc. which of the following is preferred?

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