Manufacturing method of martensitic stainless steel seamless pipe with high concentricity
A martensitic stainless steel and seamless pipe technology, applied in the field of metal pipe manufacturing technology, can solve the problems of poor center hole quality, poor concentricity, high difficulty, etc., and achieve low finished product cost, improved flaw detection pass rate, and high pass rate Effect
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Embodiment example 1
[0030] A method for manufacturing a high-concentricity martensitic stainless steel seamless pipe, comprising the following steps:
[0031] α1. Billet processing: after forging the martensitic steel ingot obtained from smelting, the forged billet is obtained, ensuring that the forging ratio is greater than 3; after cutting off the head and tail, cutting to a fixed length and skinning the outer layer, a diameter of Φ120mm is obtained. Smooth round billet, the length is about 1.4 meters;
[0032] α2. Drilling the central deep hole: On the deep hole drilling machine, drill the smooth round bar blank that has passed the flaw detection above at the center position and drill a through hole with an inner diameter of Φ61mm along the axial direction;
[0033] α3. Precision boring center hole: Install the round bar with the center hole drilled on the deep hole precision boring machine, and use the precision boring tool and floating boring tool to carry out precision boring in 2 passes, a...
Embodiment example 2
[0044] A method for manufacturing a high-concentricity martensitic stainless steel seamless pipe, comprising the following steps:
[0045] β1. Billet processing: after forging the martensitic steel ingot obtained from smelting, the forged billet is obtained, ensuring that the forging ratio is greater than 3; after cutting off the head and tail material, cutting to length and skinning the outer layer, a forged billet with a diameter of Φ102mm is obtained. Smooth round billet, the length is about 2.2 meters;
[0046] β2. Drilling the central deep hole: On the deep hole drilling machine, drill the smooth round bar blank that has passed the flaw detection above at the center position and drill a through hole with an inner diameter of Φ58mm along the axial direction;
[0047] β3. Precision boring center hole: Install the round bar with the center hole drilled on the deep hole precision boring machine, and use the precision boring tool and floating boring tool to carry out precision...
Embodiment 3
[0058] A method for manufacturing a high-concentricity martensitic stainless steel seamless pipe, comprising the following steps:
[0059] γ1. Billet processing: Forge the martensitic steel ingot obtained from smelting to obtain a forged billet, and then cut off the head and tail, cut to a fixed length and peel off the outer layer to obtain a smooth round billet with a diameter of Φ84mm and a length of It is about 3 meters. The forging ratio of the forging billet is 3;
[0060] γ2. The first non-destructive flaw detection: Carry out comprehensive ultrasonic (UT) flaw detection on the above-mentioned smooth round billets, and remove the internal rods that cannot be removed by deep hole drilling;
[0061] γ3. Drilling deep holes: On the deep hole drilling machine, the above-mentioned smooth round bar blanks that pass the flaw detection are drilled in the center position along the axial direction to drill a through hole with an inner diameter of Φ43mm;
[0062] γ4. Precision bo...
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