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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

Active Publication Date: 2015-04-08
ANHUI TIANDA OIL PIPE
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the heat treatment of the traditional cold-drawn seamless steel pipe, the surface of the steel pipe is seriously oxidized
However, the use of bright and non-oxidizing heat treatment requires high equipment costs and complicated technologies.

Method used

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Embodiment Construction

[0017] A production method of a high-gloss steel pipe, which is made of No. 20 steel and a round pipe billet with a size of 38×3mm, includes the following steps:

[0018] 1. Tube billet heating: After passing the inspection, the φ50mm round tube billet is sent to the annular heating furnace for heating. The heating temperature is 1200°C±10°C, and the steel is tapped after holding for 50±5 minutes;

[0019] 2. Perforation: Select φ40mm plug, φ38mm ejector pin, adjust the distance between the rolls of the piercing machine to 40mm, the distance between the guide plates to 48mm, the extension of the plug to 31mm, and the reduction to 16% before perforating. The perforated capillary is φ52×4mm;

[0020] 3. Pickling, phosphating, and saponification: adjust the concentration of sulfuric acid in the pickling solution between 9% and 15%, and Fe 2+ ≤200g / L, keep the temperature of the pickling solution between 30°C and 65°C, pickle the φ52×4mm capillary with pickling, soak for 15 minute...

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Abstract

The invention discloses a production method of a high-finish steel tube. A 38*3mm round billet used in the production method is made of 20# steel. The production method comprises the following steps: heating billet: heating the round billet (phi 50mm) which passes the inspection in an annular heating furnace at 1200 DEG C+ / -10 DEG C, holding the temperature for 50+ / -5min and tapping; punching: selecting a mandrel plug (phi 50mm) and an ejector rod ((phi 38mm), adjusting the distance of a roller of a puncher to be 40mm, the spacing of guide plates to be 48mm, the extend distance of the mandrel plug to be 31mm and rolling reduction to be 16% and adjusting other parameters, then punching, wherein the punched capillaries have the specification of phi 52*4mm. The production method has the advantages that the surface quality of the steel tube is guaranteed; the surface of the produced steel tube is smooth and high in finish and is identical to the surface of a bright steel tube without being subjected to oxidization thermal treatment and moreover the property of the steel tube is not affected; in addition, the production cost is reduced greatly.

Description

technical field [0001] The invention relates to the field of steel pipe production, in particular to a production method of a high-gloss steel pipe. Background technique [0002] With the continuous development of modern technology, the requirements for the surface quality of steel pipes are getting higher and higher. In particular, some heat exchangers use seamless steel pipes, which put forward high requirements on the surface finish of the steel pipes. After the heat treatment of the traditional cold-drawn seamless steel pipe, the surface of the steel pipe is severely oxidized. However, the use of bright and non-oxidizing heat treatment requires high equipment costs and complicated techniques. Contents of the invention [0003] The object of the present invention is to provide a production method of a high-gloss steel pipe, which solves the requirement of making the surface of the steel tube high-gloss without using bright and non-oxidative heat treatment. It does no...

Claims

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Application Information

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IPC IPC(8): B21C37/06C23F17/00
CPCB21C37/06C23F17/00
Inventor 吕黎红
Owner ANHUI TIANDA OIL PIPE
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