Invention Grant
- Patent Title: Lead free steel and method of manufacturing
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Application No.: US15153455Application Date: 2016-05-12
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Publication No.: US10400320B2Publication Date: 2019-09-03
- Inventor: Matthew J. Hicks , Jim L. Hill , Brook C. Bugenhagen
- Applicant: NUCOR CORPORATION
- Applicant Address: US NC Charlotte
- Assignee: NUCOR CORPORATION
- Current Assignee: NUCOR CORPORATION
- Current Assignee Address: US NC Charlotte
- Agency: Moore & Van Allen PLLC
- Agent Jeffrey R. Gray
- Main IPC: C22C38/60
- IPC: C22C38/60 ; C22C38/50 ; C22C38/48 ; C22C38/46 ; C22C38/44 ; C21D9/00 ; C22C38/06 ; C22C38/04 ; C22C38/00 ; C21D6/00 ; C22C38/54 ; C22C38/42 ; C22C38/02 ; C22C38/22

Abstract:
An essentially lead free steel having, in percent by weight (wt-%): Carbon: 0.39-0.43%; Manganese: 0.75-1.00%; Silicon: 0.15-0.35%; Chromium: 0.80-1.05%; Molybdenum: 0.15-0.25%; at least one of Tellurium: 0.003-0.090 wt-%, Selenium: 0.080-0.2 wt-%, Sulfur: 0.065-0.09% wt-%, and Bismuth: 0.03-0.1 wt-%; and the balance being Fe and normally occurring scrap steel impurities. A method for manufacturing an essentially lead free steel by subjecting a hot-rolled steel product to a heat treatment in which the steel product is subjected to a first temperature for a first duration; the steel product is subjected to a second temperature for a second duration, wherein the second temperature is less than the first temperature; and the steel product is subjected to a third temperature for a third time period, wherein the third temperature is greater than the second temperature; and cooling the steel product. After the heat treatment the steel is cold worked to the desired size.
Public/Granted literature
- US20160333451A1 LEAD FREE STEEL AND METHOD OF MANUFACTURING Public/Granted day:2016-11-17
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