STEEL FOR VEHICLE SUSPENSION SPRING PART, VEHICLE SUSPENSION SPRING PART, AND METHOD OF FABRICATING THE SAME
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United States of America Patent
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app pub date -
Nov 11, 2013
filing date -
May 12, 2011
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Abstract
Steel, excellent in corrosion resistance and low-temperature toughness, for a vehicle suspension spring part, includes 0.15 to 0.35% by mass of C, more than 0.6% by mass but 1.5% by mass or less of Si, 1 to 3% by mass of Mn, 0.3 to 0.8% by mass of Cr, 0.005 to 0.080% by mass of sol. Al, 0.005 to 0.060% by mass of Ti, 0.005 to 0.060% by mass of Nb, not more than 150 ppm of N, not more than 0.035% by mass of P, not more than 0.035% by mass of S, 0.01 to 1.00% by mass of Cu, and 0.01 to 1.00% by mass of Ni, the balance consisting of Fe and unavoidable impurities, with Ti+Nb≦0.07% by mass. The steel has a tensile strength of not less than 1,300 MPa.
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