Kaya
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Astm A106 Gr.b mara kyau bututu don ruwa
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API 5l Seamless Karfe bututun karfe don gas
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API 5l Athm A106 A333 ko A335 Kankara Carbon Karfe
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API 5CH, J55, K55, L80, N80 Karfe Basing & Tubing
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API 5 carbon carbon cheping karfe don rawar jiki ayyukan
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Astm A333, Astm A335, Astm A337, Ashem A213 / 213m alloy Karfe bututun
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Astm A192, Astm A179, Astm A209, ASTM A210 Karfe Takunan kwalta
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Dokar Welded Weld Erw bututun ƙarfe Erw Karfe Shubes
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SAN 657-3, en 10305, Din 2391 Babban bututun Karfe / Tumes