Shandong seamless steel pipe knowledge: small-caliber hot-rolled seamless steel pipe small diameter hot-rolled seamless steel pipe diameter of 159 or less are called small-caliber seamless steel pipe, small-caliber hot-rolled seamless steel pipe main production process including billet preparation before rolling , billet heating, perforation, rolling, fixed diameter and steel cooling, finishing and other basic processes. The bubbles, cracks, and looseness of small-caliber hot-rolled seamless steel tubes formed during pouring can also be welded under high temperature and pressure.
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