Ferritic-austenitic duplex stainless steel sheet with small in-plane anisotropy and manufacturing method thereof

A duplex stainless steel, anisotropic technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve problems such as reducing strength or elongation, and achieve the effect of low cost

Active Publication Date: 2018-01-02
NIPPON STEEL STAINLESS STEEL CORP
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Patent Document 1 is a technique for reducing the difference in strength or elongation between the rolling direction and the width direction, and is not a technique for in-plane anisotropy of the r value as in the present invention.

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
  • Ferritic-austenitic duplex stainless steel sheet with small in-plane anisotropy and manufacturing method thereof
  • Ferritic-austenitic duplex stainless steel sheet with small in-plane anisotropy and manufacturing method thereof
  • Ferritic-austenitic duplex stainless steel sheet with small in-plane anisotropy and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0094] The steel with the composition shown in Table 1 is smelted, cast into a slab, and the hot-rolled slab is made into a hot-rolled coil with a thickness of 3.5 mm. After that, the hot-rolled coil was annealed, pickled, and cold-rolled at a reduction rate of 78% to produce a cold-rolled sheet. Next, the cold rolled sheet is annealed. In the annealing step, the cold-rolled sheet is heated to 1050°C, and then cooled under the condition that the cooling rate up to 500°C is 10°C / sec. After annealing, pickling is performed to prepare a product board. The Δr, the maximum strength of the crystal orientation, and the austenite fraction were measured for the thus obtained product sheet by the aforementioned method.

[0095]

[0096]

[0097] table 3

[0098]

[0099] The ferrite-austenitic duplex stainless steel plates of steel Nos. 1 to 10 have a steel composition within the range specified in this embodiment, and the austenite phase ratio and the maximum strength of the crystal orie...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

This ferrite austenite 2-phase stainless steel plate comprises, by mass%, C: 0.001-0.10%, Si: 0.01-1.0%, Mn: 2-10%, P < 0.05%, Ni: 0.1-3.0%, Cr: 15.0-30.0%, and N: 0.05-0.30%, with the remainder being Fe and inevitable impurities. The austenite phase percentage is 40-90% by surface area percentage, the maximum strength of the crystal orientation of the ferrite phase is 10 or less, and the hardness ratio of the austenite phase to the ferrite phase is 1.1 or greater.

Description

Technical field [0001] The present invention relates to a duplex stainless steel plate composed of a ferrite phase and an austenite phase with small anisotropy during processing and a method of manufacturing the same. [0002] This application claims priority based on Japanese Patent Application No. 2012-52876 for which it applied to Japan on March 9, 2012, and uses the content here. Background technique [0003] Duplex stainless steel plates composed of ferrite phase and austenite phase are excellent in corrosion resistance and have a fine structure, so they have high strength and excellent fatigue resistance, and are widely used in chemical factories and the like. However, the ductility of the duplex stainless steel sheet is lower than that of the austenitic stainless steel, so cracks may sometimes occur during press forming, and improvement in workability is required. [0004] As a typical duplex stainless steel in the past, SUS329J4L (25%Cr-7%Ni-3%Mo-0.1%N) is representative and...

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 & AuthorityPatents(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/58
CPCC21D6/002C21D6/004C21D8/0436C21D8/0473C21D9/46C21D2201/05C21D2211/001C21D2211/005C22C38/001C22C38/002C22C38/008C22C38/02C22C38/06C22C38/42C22C38/44C22C38/54C22C38/58
Inventor滨田纯一石丸咏一朗
OwnerNIPPON STEEL STAINLESS STEEL CORP