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Which of the following processes is also known as the Siemens-Martin process?

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Which of the following processes is also known as the Siemens-Martin process?

(a) Open-hearth process

(b) L.D. process

(c) Electric process

(d) Duplex process

The question was asked during an interview.

My doubt is from Steel topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials

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The correct choice is (a) Open-hearth process

Easy explanation: Open-hearth process is also known as the Siemens-Martin process. This is because Seimens invented this process first and then Martin made some improvements in it. This process is used to manufacture steel.

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