Steel pipes are normally manufactured by ______________ process?
Correct answer: A. Extrusion
- A. Extrusion
- B. Cold working
- C. Forging
- D. Electroforming
Explanation
Seamless steel pipes are commonly produced by piercing and extrusion-type hot-working operations, making extrusion the best option listed. Cold working is mainly used for finishing and improving dimensional accuracy, not for normal primary manufacture.
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