Abrasion-resistant welded steel pipe
AssigneeNKK Corporation
InventorsShigeru Endo, Moriyasu Nagae, Osamu Hirano, Kazuyoshi Ume
Life of this patent
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Abstract
An abrasion-resistant welded steel pipe having a base plate and a weld metal: consists essentially of 0.05 to 0.2 wt. % C, 0.5 to 2 wt. % Si, 0.5 to 2.5 wt. % Mn, 0.02 to 2 wt. % Al, the balance being Fe and inevitable impurities; and the steel pipe has a Vickers hardness of at least 200. The abrasion-resistant welded steel pipe can further contain at least one element selected from the group consisting of 0.05 to 1 wt. % Cu, 0.05 to 2 wt. % Ni, 0.05 to 2 wt. % Cr, 0.05 to 1 wt. % Mo, 0.005 to 0.1 wt. % Nb, 0.005 to 0.1 wt. % V, 0.005 to 0.1 wt. % Ti, 0.0003 to 0.002 wt. % B.
Claims41
An abrasion-resistant welded steel pipe having a base plate and a weld metal which welds a seam joint portion of the welded steel pipe, the base plate and the weld metal both consist essentially of 0.05 to 0.2 wt. % C, 1 to 2 wt. % Si, 0.5 to 2.5 wt. % Mn, 0.02 to 2 wt. % Al and the balance being Fe and inevitable impurities;
- and said steel pipe having a Vickers hardness of at least 200.
An abrasion-resistant welded steel pipe having a base plate and a weld metal which welds a seam joint portion of the welded steel pipe, the base plate and the weld metal both consist essentially of 0.05 to 0.2 wt. % C, 1 to 2 wt. % Si, 0.5 to 2.5 wt. % Mn, 0.02 to 2 wt. % Al, at least one element selected from the group consisting of 0.05 to 1 wt. % Cu, 0.05 to 2 wt. % Ni, 0.05 to 2 wt. % Cr, 0.05 to 1 wt. % Mo, 0.005 to 0.1 wt. % Nb, 0.005 to 0.1 wt. % V, 0.005 to 0.1 wt. % Ti and 0.0003 to 0.002 wt. % B, and the balance being Fe and inevitable impurities;
- and said steel pipe having a Vickers hardness of at least 200.
An abrasion-resistant welded steel pipe having a base plate and a weld metal which welds a seam joint portion of the welded steel pipe, the base plate and the weld metal both consisting essentially of 0.05 to 0.2 wt. % C, 0.5 to 2 wt. % Si, 0.5 to 2.5 wt. % Mn, 0.5 to 2 wt. % Al and the balance being Fe and inevitable impurities;
- and said steel pipe having a Vickers hardness of at least 200.
An abrasion-resistant welded steel pipe having a base plate and a weld metal which welds a seam joint portion of the welded steel pipe, the base plate and the weld metal consisting essentially of 0.05 to 0.2 wt. % C, 0.5 to 2 wt. % Si, 0.5 to 2.5 wt. % Mn, 0.5 to 2 wt. % Al, at least one element selected from the group consisting of 0.05 to 1 wt. % Cu, 0.05 to 2 wt. % Ni, 0.05 to 2 wt. % Cr, 0.05 to 1 wt. % Mo, 0.005 to 0.1 wt. % Nb, 0.005 to 0.1 wt. % V, 0.005 to 0.1 wt. % Ti and 0.0003 to 0.002 wt. % B, and the balance being Fe and inevitable impurities;
- and said steel pipe having a Vickers hardness of at least 200.
Dependencies are inferred from the claim text.