Production method of high-finish steel tube
A production method and high finish technology, applied in the field of steel pipe production, can solve the problems of steel pipe surface oxidation, high equipment cost, complex technology, etc., and achieve the effect of good surface quality, high equipment cost and high finish
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[0017] A method for producing high-finish steel pipes, selecting a round tube blank with a material of No. 20 steel and a size of 38×3mm, including the following steps:
[0018] 1. Tube billet heating: After the φ50mm round tube billet passes the inspection, the round tube billet is sent to the annular heating furnace for heating, the heating temperature is 1200℃±10℃, and the temperature is 50±5 minutes before tapping;
[0019] 2. Perforation: select φ40mm plug, φ38mm mandrel, adjust the roller distance of the piercing machine to 40mm, guide plate spacing 48mm, head extension of 31mm, reduction of 16% and other parameters before perforating, the perforated capillary is φ52×4mm;
[0020] 3. Pickling, phosphating, saponification: adjust the concentration of sulfuric acid in the pickling solution between 9% and 15%, Fe 2+ ≤200g / L, keep the temperature of the pickling solution between 30°C and 65°C, pickling the φ52×4mm capillary tube, soaking for 15min, then start the vat, rinse with wat...
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