Process for the production of thick armour plates

US5458704A · kind A · utility

Assignee

• Thyssen Stahl AG · DE

Inventors

• Jochen Bobbert · Ratingen, DE
• Rudolf Kawalla · Bottrop, DE
• Hans Pircher · Oberndorf bei Salzburg, AT
• Gerd Sussek · Hanau, DE
• Gunter Weihrauch · Blansingen, DE

Key dates

• Filing date: Nov 12, 1993
• Grant date: Oct 17, 1995
• Expiry date: Nov 12, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the production of very hard armour plates from steel slabs, wherein the slabs are hot rolled to a final thickness above 50 mm and then hardened and possibly tempered. The characterizing feature of the invention is that a continuously cast slab is produced from a steel having PA2 0.25 to 0.32% C PA2 0.05 to 0 75% Si PA2 0.10 to 1.50% Mn PA2 0.90 to 2.00% Cr PA2 0.10 to 0.70% Mo PA2 1 20 to 4 50% Ni PA2 0.01 to 0.08% Al PA3 max 0.015% P PA3 max 0.005% S PA3 max 0.012% N PA2 residue Fe, including usual impurities, the slab then being heated to a temperature of 1150.degree. C. or higher and heated through, whereafter following cooling in air and by the spraying of its two wide sides with pressurized water, the slab is hot rolled with a surface temperature in the range of 1050.degree. to 900.degree. C. in shaping passes having an individual deformation of .epsilon..sub.h >0.1 and with a shape factor SF>0.40 to the final thickness.