-1 chromium-molybdenum Chemical compound 0.000 description 4.229910001209 Low-carbon steel Inorganic materials 0.000 description 4.229910000677 High-carbon steel Inorganic materials 0.000 description 4. 229910000851 Alloy steel Inorganic materials 0.000 description 4.238000005755 formation reaction Methods 0.000 description 6.230000015572 biosynthetic process Effects 0.000 description 6.229910000831 Steel Inorganic materials 0.000 description 8.230000035512 clearance Effects 0.000 claims abstract description 94.230000037250 Clearance Effects 0.000 claims abstract description 94.239000004033 plastic Substances 0.000 claims abstract description 160.Assignors: MATSUSHITA, TAKAYUKI, NORIMATSU, KENTAROH, YAMAMOTO, HIRONORI Publication of US20120107063A1 publication Critical patent/US20120107063A1/en Application granted granted Critical Publication of US8998734B2 publication Critical patent/US8998734B2/en Status Active legal-status Critical Current Adjusted expiration legal-status Critical Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by OSG Corp filed Critical OSG Corp Assigned to OSG CORPORATION reassignment OSG CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Original Assignee OSG Corp Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor Kentaroh Norimatsu Takayuki Matsushita Hironori Yamamoto Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active, expires Application number US13/379,535 Other versions US20120107063A1 Google Patents US8998734B2 - Thread forming tapÄownload PDF Info Publication number US8998734B2 US8998734B2 US13/379,535 US200913379535A US8998734B2 US 8998734 B2 US8998734 B2 US 8998734B2 US 200913379535 A US200913379535 A US 200913379535A US 8998734 B2 US8998734 B2 US 8998734B2 Authority US United States Prior art keywords angle lobe shape plastic deformation deformation section Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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