ELECTRIC-RESISTANCE-WELDED STEEL PIPE FOR PRODUCING HOLLOW STABILIZER, HOLLOW STABILIZER, AND METHOD FOR PRODUCING SAME
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November 6, 2024
Provided can be a high-strength stabilizer excellent in bendability and fatigue characteristics even when a hollow steel pipe is used as the stabilizer to reduce weight. An electric resistance welded steel pipe (5) for manufacturing a hollow stabilizer has a Rankford value (r value) in a pipe longitudinal direction of from 0.7 to less than 1.0. The electric resistance welded steel pipe (5) is subjected to cold bending and then to a heat treatment including quenching and tempering to manufacture a stabilizer. The cold bending is cold rotary draw bending. When bent with a bend radius of from 1.0 times to 3.0 times an outer diameter of the electric resistance welded steel pipe (5) before cold bending by the cold rotary draw bending, a flattening ratio is from 0% to 10%, a thickness reduction rate on a bending outside and a thickness increase rate on a bending inside are from 0% to 10%, and additionally, a circumferential length change of a bending center portion is from 0% to 10%. A Vickers hardness of the stabilizer after the heat treatment is adjusted to from 400 HV to less than 580 HV.
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