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Alloying element-saving hot rolled duplex stainless steel material, clad steel sheet having duplex stainless steel as mating material therefor, and production method for same

一种双相不锈钢、合金元素的技术，应用在金属轧制、制造工具、金属层状产品等方向，能够解决韧性下降等问题，达到廉价制造、能量少的效果

Active Publication Date: 2013-09-11
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the solution heat treatment is performed at 1000° C. or higher, the toughness of the base material will decrease, so it is not a preferable treatment for the above-mentioned application of the clad steel sheet.

Method used

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  • Alloying element-saving hot rolled duplex stainless steel material, clad steel sheet having duplex stainless steel as mating material therefor, and production method for same
  • Alloying element-saving hot rolled duplex stainless steel material, clad steel sheet having duplex stainless steel as mating material therefor, and production method for same
  • Alloying element-saving hot rolled duplex stainless steel material, clad steel sheet having duplex stainless steel as mating material therefor, and production method for same

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Experimental program
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Effect test

no. 1 Embodiment approach ）

[0067] Hereinafter, the unit "%" which shows content is mass %.

[0068] The first embodiment of the alloy element-saving duplex stainless steel hot-rolled steel material contains C, Si, Mn, P, S, Ni, Cr, N, and Al, and the balance contains Fe and unavoidable impurities.

[0069] In order to ensure the corrosion resistance of stainless steel, the C content is limited to less than 0.03%. If the C content exceeds 0.03%, Cr carbides are formed during hot rolling, deteriorating corrosion resistance and toughness.

[0070] Si is added in an amount of 0.05% or more for deoxidation. However, if the Si content exceeds 1.0%, the toughness deteriorates. Therefore, the upper limit of the Si content is limited to 1.0%. The Si content is preferably 0.2 to 0.7%.

[0071] Mn has the effect of increasing the austenite phase and improving toughness. In addition, it has the effect of lowering the chromium nitride precipitation temperature TN. Therefore, it is preferable to positively add ...

no. 2 Embodiment approach ）

[0091] In the second embodiment of the alloy element-saving duplex stainless steel hot-rolled steel material, it contains C, Si, Mn, P, S, Ni, Cr, N, Al, and further contains one or more selected from V, Nb, and Ti. , and the balance contains Fe and unavoidable impurities.

[0092] The inventors of the present invention have found that steel containing one or more selected from V, Nb, and Ti exhibits a behavior different from conventional knowledge.

[0093] That is, it is general conventional knowledge that corrosion resistance deteriorates when the amount of chromium nitrides increases. However, when trace amounts of V, Nb, and Ti are contained, it is apparent that unexpectedly, even if the amount of chromium nitride precipitation increases to some extent, the corrosion resistance tends to improve.

[0094] As described above, when V, Nb, and Ti are contained in small amounts, the allowable amount of chromium nitrides increases. Therefore, for steel materials containing V,...

Embodiment 1）

[0196] The chemical composition of the test steel is shown in Table 1 and Table 2 (continued from Table 1).

[0197] In addition, in the chemical composition shown in Table 1, 2, the balance is iron and unavoidable impurities. REM represents a lanthanoid rare earth element, and the content of REM is the total of these elements. In addition, O is an unavoidable impurity.

[0198] The chromium nitride precipitation temperatures TN and TN2 in the table were obtained by the following procedure.

[0199] (1) A test steel having a thickness of 10 mm was subjected to solution heat treatment under the conditions described later.

[0200] (2) After soaking at any temperature of 800 to 1000° C. for 20 minutes, water cooling is performed within 5 seconds.

[0201] (3) Wet-grind the surface layer of the cooled test steel with #500 sandpaper.

[0202] (4) Take 3g of the sample and conduct electrolysis (100mV constant voltage) in a non-aqueous solution (3% maleic acid + 1% tetramethylam...

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Abstract

An alloying element-saving hot rolled duplex stainless steel material comprising, in % by mass, 0.03% max. of C, 0.05%-1.0% of Si, 0.5%-7.0% of Mn, 0.05% max. of P, 0.010% max. of S, 0.1%-5.0% of Ni, 18.0%-25.0% of Cr, 0.05%-0.30% of N, and 0.001%-0.05% of Al, with the remainder comprising Fe and unavoidable impurities. Said material is produced by hot rolling, has a chromium nitride deposition temperature (TN) of 960 DEG C max., has a yield strength 50 MPa min. greater than that of solution heat-treated hot rolled steel material, has not received treatment after hot rolling, and has not been solution heat treated. The clad steel sheet comprises a duplex stainless steel as the mating material therefor. Said duplex stainless steel has the above composition and the chromium nitride deposition temperature (TN) thereof is 800-970 DEG C.

Description

technical field [0001] The present invention relates to an inexpensive alloy element-reduced duplex stainless steel hot-rolled steel material without solution heat treatment, a clad steel sheet including the duplex stainless steel as an interlayer material, and methods for producing the same. In particular, the present invention relates to high-strength duplex stainless steel hot-rolled steel materials usable as seawater desalination equipment, tanks of transport ships, various containers, etc., clad steel sheets including duplex stainless steel as interlayer materials, and their manufacturing methods. [0002] This application claims priority based on Japanese Patent Application No. 2011-15091 filed on January 27, 2011 and Japanese Patent Application No. 2011-44735 filed on March 2, 2011, the contents of which are incorporated herein. Background technique [0003] Duplex stainless steel contains a large amount of Cr, Mo, Ni, and N, and it is easy to precipitate intermetalli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B1/38B21B3/02B23K20/04B32B15/18C21D8/02C22C38/58
CPCB32B15/01C21D8/0226C22C38/00B21B3/02B23K20/227B23K20/24B23K2103/04B23K2103/05B23K2103/18Y10T428/12965B23K20/04B32B15/011C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C22C38/58B21B3/00
Inventor 柘植信二及川雄介山本洋一梶村治彦石田和彦
Owner NIPPON STEEL STAINLESS STEEL CORP
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