INNER SURFACE RESIN LINING THIN STEEL PIPE AND MANUFACTURING METHOD THEREOF

To provide an inner surface resin lining thin steel pipe with an excellent screw part (of which a screw shape of a steel pipe outer surface has a normal JIS shape, and unevenness on a steel pipe inner surface is small), and a manufacturing method thereof.SOLUTION: An inner surface resin lining thin steel pipe has the same outer diameter as a carbon steel pipe for piping described in JIS G 3452; has a thickness of less than 100% and 78% or more with respect to that of the carbon steel pipe; has a resin lining on a steel pipe inner surface; comprises, at a steel pipe end part, a screw part having a screw based on JIS B 0202 or JIS B 0203 on a steel pipe outer surface; and is characterized in that unevenness on the steel pipe inner surface at the screw part has a maximum height Rz of 200.0 μm or less.SELECTED DRAWING: Figure 1 【課題】良好なねじ部（鋼管外面のねじ形状が規定のＪＩＳ形状であり、かつ鋼管内面の凹凸量が小さい）を備えた内面樹脂ライニング薄肉鋼管およびその製造方法を提供する。【解決手段】ＪＩＳ Ｇ ３４５２の配管用炭素鋼管に対して、外径が同じで、厚さが１００％未満７８％以上であり、鋼管内面に樹脂ライニングを有し、鋼管端部に、鋼管外面にＪＩＳ Ｂ ０２０２またはＪＩＳ Ｂ ０２０３に基づくねじを有するねじ部を備え、前記ねじ部における鋼管内面の凹凸量が最大高さＲｚで２００．０μｍ以下であることを特徴とする内面樹脂ライニング薄肉鋼管。【選択図】図１