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Lean duplex stainless steel and method for producing same

A technology of duplex stainless steel and manufacturing method, applied in the field of economical duplex stainless steel, can solve problems such as steel coil cracks, achieve the effects of saving resources, excellent elongation and corrosion resistance, and reducing raw material costs

Active Publication Date: 2017-08-29
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such internal pores obviously cause a large number of defects on the surface of the product during reheating and hot rolling as a subsequent process, and cause a large number of cracks at the edge of the hot-rolled coil

Method used

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  • Lean duplex stainless steel and method for producing same
  • Lean duplex stainless steel and method for producing same
  • Lean duplex stainless steel and method for producing same

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Experimental program
Comparison scheme
Effect test

Embodiment

[0097] Below, the elongation and corrosion resistance will be described in detail through various embodiments of the economical duplex stainless steel of the present invention.

[0098] After preparing test pieces using molten steel adjusted to the composition content shown in Table 1 below, hot rolling, hot rolling annealing, and cold rolling annealing were performed after cold rolling to adjust the phase fraction of the material, thereby measuring elongation and corrosion resistance.

[0099]For the tensile test piece, after processing the ASTM-sub size test piece parallel to the rolling direction, adjust the rate of tensile deformation rate to 1.0×10 at room temperature -3 / s and measure. The following [Table 1] shows the alloy compositions (% by weight) for the experimental steel types.

[0100] In addition, the following [Table 2] shows the phase fractions of the ferrite phase and the austenite phase measured after annealing heat treatment at 1100° C. for some of the exp...

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Abstract

The present invention relates to lean duplex stainless steel having a dual-phase structure of an austenite phase and a ferrite phase, and a method for producing the lean duplex stainless steel, the lean duplex stainless steel according to one embodiment of the present invention, as a ferrite-austenite stainless steel, having the preferred stacking fault energy (SFE) value of the austenite phase, expressed by the formula 2 below, of 19-37 and critical deformation value range, within which the strain-induced martensite phase occurs, of 0.1-0.25. Formula 2:(see description), where Ni, Cu, Cr, N, Si and Mn indicate the overall content (wt%) of the respective constituent element, and K(x) is the distribution index of each constituent element (x) and is expressed by the formula 3 below, and V(gamma) is the constituent ratio of austenite (in the 0.45-0.75 range) Formula 3: K(x) = [amount of x element in ferrite phase] / [ amount of x element in austenite phase]

Description

technical field [0001] The invention relates to an economical duplex stainless steel with a ferrite-austenite structure and a manufacturing method thereof. Background technique [0002] Generally, austenitic stainless steels with good workability and corrosion resistance use iron (Fe) as the base metal, and the main raw materials contain chromium (Cr) and nickel (Ni), and are added by adding molybdenum (Mo) and copper (Cu), etc. Other metals, developed into various steel grades for various purposes. [0003] 300-series stainless steel, which is excellent in corrosion resistance and workability, contains expensive raw materials such as Ni and Mo. As an alternative, the use of 200-series and 400-series stainless steels has also been discussed, but 200-series and 400-series stainless steels have the following disadvantages, namely, Their respective formability and corrosion resistance are not as good as 300 series stainless steels. [0004] In addition, the duplex stainless s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/055B22D11/124B22D11/16C22C38/02C22C38/58C22C38/34C22C38/42C22C38/44C22C38/48C22C38/46C22C38/50
CPCB22D11/055B22D11/124B22D11/16C22C38/001C22C38/02C22C38/34C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C22C38/04B22D11/22C21D6/004C21D2211/001C21D2211/005
Inventor 崔点镕
Owner 浦项股份有限公司
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