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High-strength nitrogen-containing economical austenite stainless steel and manufacturing method thereof

A technology for austenitic stainless steel and its manufacturing method, which is applied in the field of high-strength nitrogen-containing economical austenitic stainless steel and its manufacturing field, which can solve problems such as unstable production and size limitations, and achieve small performance differences and good shape of the same plate , the effect of excellent corrosion resistance

Active Publication Date: 2019-06-04
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, in the industrial mass production mode, it is not yet possible to stably produce products with a N content higher than 1.0%
Therefore, the production of high nitrogen steel is still basically in the laboratory or pilot stage, and the size is limited

Method used

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  • High-strength nitrogen-containing economical austenite stainless steel and manufacturing method thereof
  • High-strength nitrogen-containing economical austenite stainless steel and manufacturing method thereof
  • High-strength nitrogen-containing economical austenite stainless steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The composition of the steel is shown in Table 1. The two-step method of electric furnace and AOD is used for smelting. During the smelting process, the reduced Si content in the molten steel is controlled to be greater than 0.3%, and the actual analysis on site is 0.45%. The refining time of the LF station is not less than 40 minutes, and the actual time is 45 minutes. Argon blowing soft stirring time is not less than 10min, actually 12min. Ca treatment and B microalloying are carried out at the end of LF station. The molten steel is continuously cast to obtain a slab, and the slab is then subjected to hot rolling, hot annealing, pickling, first cold rolling, first soft annealing pickling, second cold rolling, second soft annealing pickling and smoothing to produce 2B surface state strip steel. Among them, the first cold rolling reduction is 55%, the first soft annealing temperature is 850°C, the first soft annealing time is 2min, the second cold rolling reduction is...

Embodiment 2

[0064] The steel composition is shown in Table 1. The two-step method of electric furnace and AOD is used for smelting. The control requirements of the smelting process are the same as in Example 1. The actual values ​​of each main control point are: LF refining time 40 minutes, argon blowing soft stirring time 15 minutes. The molten steel undergoes continuous casting, hot rolling, hot rolling annealing and pickling, first cold rolling, first soft annealing pickling, second cold rolling, second soft annealing pickling, and smoothing to produce a high-strength nickel-saving austenitic alloy with a 2B surface state. One-time cold rolling reduction is 60%, the first soft annealing temperature is 800°C, the first soft annealing time is 3min, the second cold rolling reduction is 50%, and the second soft annealing temperature is 900°C, the second flexible annealing holding time is 3min. The mechanical performance test results of this embodiment are shown in Table 3.

[0065] GB / T 1...

Embodiment 3

[0068] The steel composition is shown in Table 1, and the two-step method of electric furnace and AOD is used for smelting. The control requirements of the smelting process are the same as in Example 1. The actual values ​​of each main control point are: LF refining time is 40 minutes, and argon blowing soft stirring time is 15 minutes . The molten steel undergoes continuous casting, hot rolling, hot annealing and pickling, first cold rolling, first soft annealing pickling, second cold rolling, second soft annealing pickling, and smoothing to produce high-strength nickel-saving austenites with a 2B surface state. Body stainless steel strip. The first cold rolling reduction is 60%, the first soft annealing temperature is 850°C, the first soft annealing time is 3min, the second cold rolling reduction is 50%, the second soft annealing temperature is 900°C, the second soft annealing time 1.5min. The mechanical performance test results of this embodiment are shown in Table 3.

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Abstract

The invention relates to a high-strength nitrogen-containing economical austenite stainless steel and a manufacturing method thereof. The chemical components of the stainless steel, by weight, of 0.05-0.15% of C, 0.3-1% of Si, 8.5-11.0% of Mn, 14.0-16.0% of Cr, 1.0-2.5% of Ni, 0.10-0.25% of N, less than 0.08% of P, less than 0.01% of S, 0.5-2.0% of Cu, 0.1-0.5% of Mo, and the balance Fe and inevitable impurities, wherein Md <30 / 50> is greater than or equal to 20 DEG C. In the manufacturing process of the high-strength nitrogen-containing economical austenite stainless steel, through cold rolling twice and flexible annealing, crystal grains are refined through production and inversion of deformation martensites, and finally, the crystal grains of which the dimension is smaller than 500nm are obtained, so that the intensity of materials is greatly improved; and the obtained high-strength nitrogen-containing economical austenite stainless steel has the following specific properties that the yield strength is greater than or equal to 650MPa, the tensile strength is greater than or equal to 1000MPa, and the elongation rate is greater than or equal to 35%, and the high-strength nitrogen-containing economical austenite stainless steel is suitable for preparation of high-strength fine-specification precision strip steels.

Description

technical field [0001] The present invention relates to a high-strength nitrogen-containing economical austenitic stainless steel and its manufacturing method, more specifically to a high-strength nitrogen-containing economical austenitic stainless steel obtained by obtaining nano-scale grains through repeated thermomechanical deformation + flexible annealing. Body stainless steel and method of manufacture thereof. Background technique [0002] With the advancement of industrial technology, the requirements for metal materials in all walks of life continue to increase, and low cost and high strength will be the development trend of metal materials in the future. For example, the lightweight development requirements in the fields of automobiles and aviation require materials with higher strength and better plasticity, and at the same time, the cost should not be too high. In addition, in the precision electronics industry, a large number of high-strength thin tapes are also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/42C22C38/44C21D8/02
Inventor 季灯平王勇方徽源
Owner BAOSTEEL DESHENG STAINLESS STEEL
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