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Ti-CONTAINING FERRITIC STAINLESS STEEL SHEET, MANUFACTURING METHOD, AND FLANGE

a technology of ferritic stainless steel and manufacturing method, which is applied in the direction of manufacturing tools, furnaces, heat treatment apparatus, etc., can solve the problems of deterioration of productivity and increase of production cost, and achieve excellent toughness, stably achieved, and enhanced steel sheet

Inactive Publication Date: 2019-03-28
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a way to make a thick steel sheet made of a specific type of stainless steel that is strong and tough. This type of steel is particularly useful in low-temperature settings and is reliable even when formed into different shapes.

Problems solved by technology

These measures involve deterioration of the productivity and increase of the production cost.

Method used

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Examples

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examples

[0047]Steels shown in Table 1 were made, and continuously cast slabs having a thickness of approximately 200 mm were obtained. The chemical compositions of the steels satisfied the requirement of the invention. The continuously cast slab was placed in a heating furnace, and after retaining at a slab heating temperature shown in Table 2 depending on the types of steel for approximately from 50 to 100 minutes, the slab was taken out from the furnace and immediately subjected to rough rolling with a rough rolling mill. The extraction temperature was the same as the slab heating temperature. The rough rolling was performed by from 7 to 9 passes depending on the target finish sheet thickness, and an intermediate slab having a thickness of from 20 to 50 mm was produced. The surface temperature of the intermediate slab was measured at the outlet side of the final pass of the rough rolling mill. The temperature is shown as “Intermediate slab temperature” in Table 2. The resulting intermedia...

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Abstract

A Ti-containing ferritic stainless steel sheet having a large gauge thickness and excellent toughness has a chemical composition containing, in terms of percentage by mass, from 0.003 to 0.030% of C, 2.0% or less of Si, 2.0% or less of Mn, 0.050% or less of P, 0.040% or less of S, from 10.0 to 19.0% of Cr, 0.030% or less of N, from 0.07 to 0.50% of Ti, from 0.010 to 0.20% of Al, from 0 to 1.50% of Mo, and from 0 to 0.0030% of B, the balance of Fe and unavoidable impurities. The steel has a K value defined by the following expression of 150 or more: K value=−0.07′Cr−6790′Free(C+N)−1.44′d+267, and having a sheet thickness of from 5.0 to 11.0 mm. Herein, Free(C+N) corresponds to the solid-dissolved (C+N) concentration (% by mass), and d represents an average crystal grain diameter (μm).

Description

TECHNICAL FIELD[0001]The present invention relates to a Ti-containing ferritic stainless steel sheet having a large gauge thickness excellent in toughness, and a method for manufacturing the same. The invention also relates to a flange using the Ti-containing ferritic stainless steel sheet.BACKGROUND ART[0002]Members for an automobile exhaust gas flow path are demanded to have such characteristics as corrosion resistance, heat resistance, strength, and the like. As a material that is excellent in these characteristics, an austenitic stainless steel sheet has been frequently used. In recent years, there is an increasing need to use a ferritic type steel, which has a small thermal expansion coefficient and a small raw material cost, instead of an austenitic type steel. Examples of the alternate material therefor include a Ti-containing ferritic stainless steel sheet.[0003]Members for an automobile exhaust gas flow path are generally produced by subjecting a cold rolled and annealed st...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C21D9/46C22C38/32C22C38/28C22C38/22C22C38/06C22C38/04C22C38/02C22C38/00C21D8/02C21D6/00F01N13/16F01N13/18
CPCC21D9/46F01N2530/04C22C38/28C22C38/22C22C38/06C22C38/04C22C38/02C22C38/002C22C38/001C21D8/0226C21D8/0205C21D6/008C21D6/005C21D6/002F01N13/16F01N13/1805F01N13/1872C22C38/32C21D8/02C22C38/38Y02P10/20C21D8/0263C22C38/00
Inventor MITSUNAGA, SEIJIEBIHAMA, NOBUHISAEHARA, YASUHIROIMAKAWA, KAZUNARI
Owner NIPPON STEEL STAINLESS STEEL CORP
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