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Nickel-saving type double-phase stainless steel and preparation process thereof

A technology of duplex stainless steel and preparation process, applied in the field of nickel-saving duplex stainless steel, can solve the problems of reducing the overall performance and strengthening the difference in strength, etc.

Active Publication Date: 2015-04-29
ZHENSHI GROUP EASTERN SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the production process does not control the equivalent ratio of chromium to nickel, the strength difference between the two phases is strengthened, and the overall performance is reduced.

Method used

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  • Nickel-saving type double-phase stainless steel and preparation process thereof
  • Nickel-saving type double-phase stainless steel and preparation process thereof
  • Nickel-saving type double-phase stainless steel and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this embodiment, the preparation process of nickel-saving duplex stainless steel includes the following steps.

[0046] 1) In the Consteel electric furnace, the composition of the mother liquor is controlled at C: 1.72%, Si: 0.65%, Cr: 14.5%, Ni: 1.8%, P: 0.018%, and the tapping temperature is controlled at 1610°C. The mother liquor can be made of stainless steel waste, Manufactured from high quality steel scrap, ferronickel and ferrochromium. The mother liquor in the electric furnace and the high-carbon ferrochrome mother liquor in the intermediate frequency furnace are mixed to form a mixed mother liquor. The composition of the high-carbon ferrochrome mother liquor is C: 6%, Si: 4%, P: 0.05, Cr: 62%, and the rest is iron.

[0047] 2) Transfer the mixed mother liquor into the AOD furnace for oxygen decarburization, nitrogen blowing and composition adjustment; then refine in the ladle refining furnace and add microalloy composition for final adjustment, after adjustm...

Embodiment 2

[0055] The nickel-saving duplex stainless steel prepared in Example 1 comprises the following components in weight percent:

[0056] C: 0.035%; Si: 0.3%; Mn: 4.0%; Cr: 19%; Ni: 1.0%; Mo: 0.25%; N: 0.20%; Cu: 0.2%; S: 0.001%; ​​P: 0.035%; O: 0.005%; B: 0.005%; Ca: 0.005%; Al: 0.001%; ​​REM: 0.005;

[0057] figure 2 The gray is the ferrite structure, and the bright white is the austenite structure. It can be seen that the phase boundary is smooth and there is no obvious precipitated phase. image 3 It shows the surface quality of stainless steel after pickling, and it can be seen that the quality of the surface is good.

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Abstract

The invention relates to a preparation process of nickel-saving type double-phase stainless steel, comprising the following steps of: 1) controlling components of a mother solution in an electric furnace as follows: more than 1.0% of C, less than 1.0% of Si, 12-21% of Cr, 1.5-1.9% of Ni and less than 0.025% of P, controlling a tapping temperature at 1580-1630 DEG C, and mixing the mother solution in the electric furnace with a high-carbon ferro-chrome mother solution in an intermediate-frequency furnace to form a mixed mother solution, wherein the high-carbon ferro-chrome mother solution contains the following components of 6-10% of C, less than 0.5% of Si, less than 0.06% of P, 62-72% of Cr and the balance of iron; and 2) blending the mixed mother solution into an AOD (Argon Oxygen Decarburization) furnace to carry out oxygen blowing and decarburization, nitrogen blowing and component adjustment, refining in a steel ladle refining furnace and adding a micro-alloy into the components, and finally adjusting, wherein the adjusted chrome-nickel equivalence ratio is more than or equal to 2.2. The chrome-nickel equivalence ratio is properly controlled to be good for forming double-phase stainless steel high-temperature ferrite so that heat machining is carried out in a single-phase region to the greatest extent; and furthermore, the preparation process is good for the high-temperature plasticity of the double-phase stainless steel.

Description

technical field [0001] The invention relates to a nickel-saving duplex stainless steel, and also relates to a preparation process of the nickel-saving duplex stainless steel, which belongs to the metallurgical industry. Background technique [0002] The main components of traditional 18-8 austenitic stainless steel and duplex stainless steel are chromium, nickel and molybdenum, while nickel and molybdenum are expensive and fluctuate greatly, which restricts the development of stainless steel. In order to save costs, reduce the nickel and molybdenum of steel The content of molybdenum can be replaced by increasing the content of manganese and nitrogen to replace part of the content of nickel, and by increasing the content of chromium to replace the content of molybdenum. The reduction of nickel and molybdenum content can reduce the impact of raw material price fluctuations on the stainless steel market. At the same time, with the development of AOD and LF steelmaking processe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C33/06C21D8/02
Inventor 李杰申鹏付学慧张寄东
Owner ZHENSHI GROUP EASTERN SPECIAL STEEL
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