Hot-rolled ferritic steel for motor vehicle exhaust members
US5792285A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1996 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Jul 2, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/26
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A hot-rolled ferrite steel capable of being used in a hot-rolled annealed condition as a material for a motor vehicle exhaust system including: PA1 about 0.02 wt % or less of C, PA1 about 0.8 wt % or less of Mn, PA1 about 0.015 wt % or less of N, PA1 about 0.02 wt % or less of Al, PA1 about 0.02 wt % or less of Ti, PA1 about 0.02 wt % or less of Zr; the steel further including: PA1 about 0.4 to 2 wt % of Si, PA1 about 6 to 17 wt % of Cr, PA1 about 0.025 to 0.10 wt % of P, PA1 about 0.35 to 0.60 wt % of Nb; and PA1 the balance Fe and incidental impurities. The weight percentages of the above components satisfy the following equations (1) and (2): EQU Nb/(C+N).gtoreq.13 (1) EQU 11.ltoreq.Cr+3Si+4Nb-50(C+N+P)-Mn-Ni-Co+Mo+Cu.ltoreq.16.5 (2), such that a low-cost ferritic steel is produced which, after conventional hot rolling, exhibits characteristics well-suited for motor vehicle exhaust systems such as high workability, high heat resistance and good manufacturability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.