Patent · US Expired

Worked low-temperature tough ferritic steel

US4687525A · kind A · utility

12Cited by

2References

5Claims

0Family size

Assignee

Hoesch Stahl AG · DE

Inventors

Franz-Josef Biniasz · Dortmund, DE
Bernhard Engl · Dortmund, DE
Axel Fuchs · Richmond, US
Margit Huser · Dortmund, DE

Key dates

Filing date	Aug 30, 1985
Grant date	Aug 18, 1987
Priority date	—
Expiry date	Aug 30, 2005

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF17C2223/0161
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The invention concerns a method for manufacturing a worked weldable, low temperature ferritic steel consisting of PA0 0.015 to 0.08% C PA0 0.1 to 0.5% Si PA0 0.3 to 0.6% Mn PA0 <0.015% P PA0 <0.015% S PA0 4 to 7% Ni PA0 0 to 1.5% Cu the rest iron and unavoidable impurities in normal amounts which is characterized in that the steel has added to it 0.15 to 0.25% vanadian and 0.020 to 0.030% nitrogen; the steel being rolled and then cooled to room temperature and finally subjected to a one time normalizing. Such a steel is usable as work material for making construction part especially for the transport and storage of liquified natural gas and having at a temperature of -196.degree. C. a notch charpy impact value at longitudinal test samples of more than 42 J.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.