Unlock instant, AI-driven research and patent intelligence for your innovation.

Austenitic stainless steel for nuclear power valve and preparation method thereof

A technology of austenitic stainless steel and valves, which is applied in the field of metallurgy, can solve the problems of low strength and toughness comprehensive performance, and achieve the effect of optimization of refinement effect, wide application prospect, and low capital investment

Active Publication Date: 2021-04-20
LIAONING WUHUAN SPECIAL MATERIALS & INTELLIGENT EQUIP IND TECH RES INST CO LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the addition of Ti element has effectively improved the corrosion resistance of austenitic stainless steel for nuclear power valves, the strength and toughness of 06Cr18Ni11Ti austenitic stainless steel for nuclear power valves are currently low. With the rapid development of my country's nuclear power industry , it is of great significance to develop a manufacturing method for nuclear power valve steel with higher strength and toughness without reducing plasticity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Austenitic stainless steel for nuclear power valve and preparation method thereof
  • Austenitic stainless steel for nuclear power valve and preparation method thereof
  • Austenitic stainless steel for nuclear power valve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using industrial pure iron, recarburizer, industrial silicon, ferromanganese, micro-carbon ferrochrome, metallic nickel and sponge titanium as raw materials, use a vacuum induction melting furnace to melt the alloy. After the molten steel is melted evenly, add Y 2 o 3 powder. add Y 2 o 3 The composition of molten steel before powder is shown in Table 1. After the molten steel is evenly smelted, Y 2 o 3 Powder (see Table 2 for the amount added), stirred evenly, and cast molten steel into billets at a casting temperature of 1470°C and hot forging, with a starting forging temperature of 1140°C and a final forging temperature of 980°C. Then, the hot forging billet is subjected to cyclical cold forging treatment along three directions of length, width and height at room temperature, and the forging ratios are 1.5, 1.5 and 1.5 respectively. Forging in all three directions is a cycle, and spraying an ice-cold solution to cool down and refrigerate after every 2-4 cycles. ...

Embodiment 2

[0037] Using industrial pure iron, recarburizer, industrial silicon, ferromanganese, micro-carbon ferrochrome, metallic nickel and sponge titanium as raw materials, use a vacuum induction melting furnace to melt the alloy. After the molten steel is melted evenly, add Y 2 o 3 powder. add Y 2 o 3 The molten steel composition before the powder is the B component in Table 1. After the molten steel is evenly smelted, add Y with a particle size of 40-80nm and a mass percentage of 0.01%. 2 o 3 Powder, after stirring evenly, cast molten steel into a billet, the casting temperature is 1550°C, and hot forging, the starting forging temperature is 1200°C, and the final forging temperature is 1050°C. Then, the hot forging billet is subjected to cold forging at room temperature along the three directions of length, width and height, with forging ratios of 1.9, 1.7 and 1.7. Forging in all three directions is 1 cycle, and after every 2-4 cycles Cool down with a spray of ice-cold solutio...

Embodiment 3

[0042] Using industrial pure iron, recarburizer, industrial silicon, ferromanganese, micro-carbon ferrochrome, metallic nickel and sponge titanium as raw materials, use a vacuum induction melting furnace to melt the alloy. After the molten steel is melted evenly, add Y 2 o 3 powder. add Y 2 o 3 The molten steel composition before the powder is the D composition in Table 1. After the molten steel is evenly smelted, add Y with a particle size of 40-80nm 2 o 3 Powder (see Table 4 for the content), stir the molten steel into a billet after being evenly stirred, the casting temperature is 1495°C, and hot forging, the initial forging temperature is 1160°C, and the final forging temperature is 995°C. Then the hot forging billet is subjected to cold forging at room temperature along the three directions of length, width and height, with forging ratios of 1.2, 1.2 and 1.2. Forging in all three directions is 1 cycle, and after every 2-4 cycles Cool down with a spray of ice-cold so...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to austenitic stainless steel for a nuclear power valve and a preparation method thereof. The austenitic stainless steel for the nuclear power valve comprises the following components: less than or equal to 0.08% of C, less than or equal to 0.8% of Si, less than or equal to 2.00% of Mn, less than or equal to 0.02% of S, less than or equal to 0.03% of P, 17.0-19.0% of Cr, 9.0-12.0% of Ni, less than or equal to 0.08% of Co and more than or equal to 5 * C% of Ti. The preparation method comprises the steps that alloy materials are smelted through a vacuum induction smelting furnace; Y2O3 powder is added after molten steel is smelted evenly, the molten steel is cast into a blank after being stirred evenly, and hot forging is conducted; the hot forging blank is sequentially subjected to cyclic reciprocating cold forging and pressing treatment in the length direction, the width direction and the height direction at the room temperature, one time of forging and pressing in the three directions is taken as one cycle, an ice-cold solution is sprayed once every 2-4 cycles, and the cycle is repeated until the required cyclic forging and pressing frequency is reached; and heat treatment is carried out at the temperature of 980-1080 DEG C for 0.1-20 h. The yield strength of the 06Cr18Ni11Ti austenitic stainless steel treated through the method can be improved by 20% or above, and the 06Cr18Ni11Ti austenitic stainless steel has excellent comprehensive strength and toughness and low anisotropy and is very wide in market application prospect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an austenitic stainless steel for nuclear power valves and a preparation method thereof. Background technique [0002] 06Cr18Ni11Ti austenitic stainless steel has been widely used in nuclear power valves due to its good intergranular corrosion resistance and weldability. It is also widely used in offshore platforms, heat exchangers, underwater equipment, fire-fighting equipment and other oil and gas industry equipment, submarine pipelines, power plant desulfurization and denitrification systems, industrial scrubbing systems, absorption towers and other energy equipment. [0003] In stainless steel, Cr is one of the main elements to inhibit intergranular corrosion. For ordinary austenitic stainless steel without Ti, Cr is easy to precipitate when C combines with Cr at the grain boundary. 23 C 6 , reduce the Cr content at the grain boundary to form chromium-deplete...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/50C22C38/58C21D8/00C22C33/04
Inventor 冯泉张俊飞张擎宇张强
Owner LIAONING WUHUAN SPECIAL MATERIALS & INTELLIGENT EQUIP IND TECH RES INST CO LTD