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Nuclear safety grade 316L stainless steel gauge pipe

A stainless steel and instrument tube technology, applied in the field of metal smelting, to achieve the effects of optimizing process parameters, simplifying deformation passes, and excellent surface quality

Active Publication Date: 2016-04-27
ZHEJIANG JIULI HI TECH METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this product was imported before, there is no relevant patent report on the nuclear safety grade 316L stainless steel small-diameter instrument tube in China.

Method used

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  • Nuclear safety grade 316L stainless steel gauge pipe
  • Nuclear safety grade 316L stainless steel gauge pipe
  • Nuclear safety grade 316L stainless steel gauge pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Using 316L stainless steel billet / steel ingot as raw material, a blank pipe is formed by extrusion, and the specification, dimensional deviation and straightness requirements of the blank pipe after finishing are shown in Table 1. 100% visual inspection of the surface of the extruded waste tube requires: the end should be straight and free of burrs, no scale, glass lubricant particles and other impurities are allowed on the inner and outer surfaces, and under-acid, over-acid, stains and rust spots.

[0030] Table 1. Extruded blank pipe specifications, dimensional deviation and straightness requirements

[0031]

[0032] The technical implementation scheme of the cold rolling process is shown in Table 2.

[0033] Table 2. Implementation scheme of cold rolling process

[0034]

[0035] Among them, the billet cold rolling feed is 3.0 mm / n, and the rolling speed is 70 times / min; the finished cold rolling feed is 1.5 mm / n, and the rolling speed is 120 time...

Embodiment 2

[0043] Embodiment 2: The difference between embodiment 2 and embodiment 1 is that the cold rolling feed of the billet is 2.0mm / n, and the rolling speed is 60 times / min; the cold rolling feed of the finished product is 2.0mm / n, and the rolling speed 150 times / min.

[0044] There are five heating zones in the bright furnace, in which zone 1 is set at a temperature of 1010°C; zone 2~4 is set at a temperature of 1060°C; zone 5 is set at a temperature of 1010°C, and the feed rate is 600mm / min. Control the flow rate of hydrogen to 50m 3 / h, the dew point of hydrogen is controlled at -40°C, and the micro-oxygen content of hydrogen does not exceed 15ppm. The cooling time from 900~500℃ is only no more than 3.0 minutes.

[0045] The composition of a 316L stainless steel pipe used for instrumentation pipes is: C: 0.015%, Si: 0.5%, Mn: 1.0%, P: 0.03%, S: 0.005%, Cr: 18.0%, Ni: 12.0 %, Mo: 2.5%, Co: 0.05%, and the balance is Fe.

[0046] The cold-rolling mandrel used in the cold-rollin...

Embodiment 3

[0047] Embodiment 3: The difference between embodiment 3 and embodiment 1 is that the cold rolling feed of the billet is 4.0mm / n, and the rolling speed is 80 times / min; the cold rolling feed of the finished product is 1.0mm / n, and the rolling speed 100 times / min.

[0048] There are five heating zones in the bright furnace, in which zone 1 is set at a temperature of 1020°C; zone 2~4 is set at a temperature of 1070°C; zone 5 is set at a temperature of 1020°C, and the feed rate is 600mm / min. Control the flow rate of hydrogen to 70m 3 / h, the dew point of hydrogen is controlled at -60°C, and the micro-oxygen content of hydrogen does not exceed 15ppm. The cooling time from 900~500℃ is only no more than 1.0 minutes.

[0049] The composition of a 316L stainless steel pipe used for instrumentation pipes is: C: 0.04%, Si: 0.12%, Mn: 2.0%, P: 0.02%, S: 0.010%, Cr: 16.0%, Ni: 14.0 %, Mo: 2.0%, Co: 0.01%, and the balance is Fe.

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Abstract

The application of the invention discloses a nuclear safety grade 316L stainless steel gauge pipe. A round pipe blank is adopted as a raw material. The manufacture method comprises the steps of a cold rolling procedure, a solid solution thermal treatment procedure and storage; the cold rolling procedure comprises a cogging cold rolling step, an intermediate-product cold rolling step and a finished-product cold rolling step; the relative deformation of the cogging cold rolling step is 70%-75%; the relative deformation of the intermediate-product cold rolling step is 65%-70%; the relative deformation of the finished-product cold rolling step is 60%-65%; and the treatment temperature of the solid solution thermal treatment procedure is 1060 DEG C-1080 DEG C. The dimension precision, the surface quality and the comprehensive performance of products reach a higher level; the long-term safe service requirement in a nuclear grade environment is met; and the production efficiency and the qualification rate are both at a high level.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a nuclear safety grade 316L stainless steel instrument tube. Background technique [0002] Large-scale advanced pressurized water reactor nuclear power is the main development direction of nuclear power in the world at present. Its representative reactor type is the AP1000 nuclear power technology introduced by my country from Westinghouse Corporation of the United States and the ACP1000 nuclear power technology independently designed by my country. In the AP1000 nuclear power plant instrument measurement and control system currently under construction, a large number of nuclear safety instrument components use 316L stainless steel small-diameter instrument tubes, which are also key components of the third-generation nuclear power instrument nuclear island measurement system. Previously, all 316L stainless steel instrument tubes of AP1000 reactor type were imported. As my...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/52C22C38/58C22C38/04C22C38/02C21D9/08F16S3/00
CPCC21D9/08C22C38/02C22C38/04C22C38/44C22C38/52C22C38/58F16S3/00
Inventor 林珏蔡志刚蔡黎明蔡卫康
Owner ZHEJIANG JIULI HI TECH METALS
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