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There are two types of pipes/tubes. One type covers seamless stainless steel pipes/tubes made by hollowing out billets into "seamless" tubular shapes and the other type covers welded stainless steel pipes/tubes made by folding steel sheets or strip into tubular shapes and then welding them. Seamless pipes/tubes generally have heavy wall thicknesses relative to their outside diameters, while welded pipes/tubes generally have light wall thicknesses. Seamless pipes/tubes have a higher reliability since there is no "seam" involved. But due to their relatively large production lots, seamless pipes/tubes are sometimes placed at a disadvantage in terms of economical efficiency. |
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Product form |
Round pipes/tubes |
Square pipes/ tubes |
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Welded |
Seamless |
JFE Steel Corporation |
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NISSHIN STEEL CO.,LTD. |
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Sanyo Special Steel Co.,Ltd. |
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NASTOA., LTD. |
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Nippon Metal Tube Co.,Ltd |
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Daigo Co.,Ltd. |
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MORY INDUSTRIES INC. |
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ARAYA SPECIAL METAL CO.,LTD. |
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STAINLESS STEEL PIPE KOGYO CO.,LTD. |
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Sumikin&Nippon Steel Stainless Steel Pipe Co.,Ltd. |
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Daiichi Stainless Kokan Co.,Ltd. |
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TOKUSHU KOKAN CO.,LTD. |
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Nippon Stainless Steel KOZAI Co.,Ltd. |
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IKURA SEIKI SEISAKUSHO Co., Ltd. |
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