| 摘要 |
<p>A testing method for the bolt to be used under the conditions of excessive wind force by which bolts made of Cr-Mo steel can be separated into a group of bolts usable in cold areas and a group of bolts unusable in cold areas without conducting Charpy impact test involving complicated operation, specifically, a testing method for determining whether bolts made of heat-treated Cr-Mo steel are usable or unusable in cold areas, wherein the determination is conducted on the basis of both J parameter calculated by formula: J = (Si% + Mn%) × (P% + Sn%) × 10 4 (wherein P%, Si%, Mn% and Sn% are contents (mass%) of phosphorus (P), silicon (Si), manganese (Mn) and tin (Sn) respectively as disclosed in the inspection certificate of the Cr-Mo steel) and bolt diameter.</p> |
