Electric resistance welded steel pipe for producing hollow stabilizer, hollow stabilizer, and production methods for same

A production method for an electric resistance welded steel pipe for producing a hollow stabilizer comprising:

• a first step of molding a steel sheet into a cylindrical shape by cold molding to form an open pipe, butting end portions in a width direction of the open pipe against each other, and
• performing electric resistance welding to the end portions to form an electric resistance welded pipe;
• a second step of heating the electric resistance welded pipe to a temperature of 850° C. or more and 1000° C. or less, and then applying hot stretch reducing to the electric resistance welded pipe at a rolling temperature of 650° C. or more and 1000° C. or less and at a cumulative reduction ratio of 30% or more and 90% or less;
• and
• a third step of adjusting an internal weld bead cut portion having an outline shape of a three-peak shape along a circumferential direction in which a trough portion is formed on each of both right and left sides across a weld zone such that a depth H of the trough portion is 0.3 mm or less and an angle θ formed by a central portion in the circumferential direction of the trough portion and a top of right and left peak portions located on both right and left sides of the trough portion is 160° or more and less than 180°.