Method for producing a heat transfer tube for steam generator using drawing, solution heat treatment, and straightening

A method for producing a heat transfer tube for a steam generator, the method comprising:

• a step of providing a tube;
• a step of applying cold drawing to the tube, the step of applying cold drawing to the tube including using a high-pressure lubricating oil that has a pressure of 40 MPa or more;
• after the step of applying cold drawing to the tube, a step of applying a solid solution heat treatment to the tube;
• and
• after the step of applying a solid solution heat treatment to the tube, a step of straightening the tube by using a roll straightening machine,
• wherein
• the roll straightening machine includes at least five pairs of concave globoidal drum type rolls, each pair of rolls being arranged opposite to each other in a vertical direction and in a crossing manner such that directions of rotating shafts of each pair of rolls cross each other, a stand interval being set at 300 mm or less;
• in the step of straightening the tube, offsetting is formed by three points along a tube axial centerline that are crossing positions of at least three successive pairs of upper and lower straightening rolls of the roll straightening machine and offsetting makes η expressed by Formula (1) described below to satisfy 0.9×10−3 or more and ensures an offset amount of 5 mm or less:
• η=1/R×(d/2) (1)
• where given that an outside diameter of the tube is d (mm) and a stand interval of the roll straightening machine is L (mm) and an offset amount is δ (mm), R=(δ2+L2)/2δ is established.