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

Active Publication Date: 2019-03-26
南通金尼新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the length-to-diameter ratio of this deep hole has reached about 400, this is extremely difficult deep hole processing, and the quality of the center hole is poor. There are generally spiral scratches, fine cracks and butt joint errors left on the surface of the center hole during drilling. Various center hole defects such as edges, and the maximum wall thickness difference of the finished pipe is about 1-2mm, and the concentricity is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a manufacturing method of a martensitic stainless steel seamless pipe with high concentricity. The manufacturing method comprises the following steps that a bar billet is manufactured; a central through hole is drilled; the central hole is bored precisely; an outer circle is subjected to finish turning to ensure concentricity; a first pass of cold rolling is carried out; acold rolled pipe is cleaned; the rolled pipe is annealed; a next pass of cold rolling is carried out; a finished product of the rolled pipe is heated; finishing of the finished pipe is carried out; and nondestructive test of the finished pipe is carried out. The manufacturing method is simple and practical, reasonable in cost and good in cost performance, and the finished X12Cr13 martensitic stainless steel pipe has high concentricity, it is ensured that various performance completely meet the use requirements, and the manufacturing method is suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of metal pipe manufacturing technology, in particular to a method for manufacturing a martensitic thick-wall stainless steel seamless pipe used for a reactor control rod driving mechanism. Background technique [0002] According to the needs of my country's energy structure adjustment, the country is actively developing the nuclear power industry. At present, the proportion of nuclear power in my country's energy supply is still very low, and it has good development prospects in the future. The localization ratio of equipment for nuclear power units that has been built in my country still needs to be improved, and some key components and special materials still rely on imports for a long time. Among them, the X12Cr13 martensitic thick-walled stainless steel tubes used in the drive mechanism of the reactor control rod drive mechanism are all dependent on imports. . [0003] The driving rod of the nuclear pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21C37/30
CPCB21C37/06B21C37/30
Inventor 彭超
Owner 南通金尼新材料科技有限公司
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