Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Process for producing high-strength, low yield ratio and high ductility dual-phase structure steel sheets










Image Number 11 for United States Patent #4285741.

Process for producing a high strength, low yield ratio and high ductility dual-phase structure steel sheet having a structure composed mainly of a ferrite phase and a rapidly cooled transformation phase and having excellent formability with a tensile strength of 40 kg/mm.sup.2 or higher. The process comprises cooling the continuously annealed steel sheet under the following conditions:(1) 1.degree. C./second.ltoreq.R.sub.1 .ltoreq.30.degree. C./secondwherein R.sub.1 represents an average cooling rate from the continuous annealing temperature down to an intermediate temperature T.degree. C. in the cooling process.(2) 4.degree. C./second.ltoreq.R.sub.2 .ltoreq.100.degree. C./secondwherein R.sub.2 represents an average cooling rate from T.degree. C. to a temperature not higher than 200.degree. C.,(3) R.sub.1 <R.sub.2 and(4) 420.degree. C..ltoreq.T.ltoreq.700.degree. C.








 
 
  Recently Added Patents
Selective facsimile denial
Method of manufacturing semiconductor device
Apparatus for transmitting and receiving data in a wireless communication system and method thereof
Rack
Conversion of 5-(chloromethyl)-2-furaldehyde into 5-methyl-2-furoic acid and derivatives thereof
Method for producing interferon alpha 5
Method and apparatus for band switching in wireless local access network
  Randomly Featured Patents
Device and method for transporting materials
One-spot coke quencher car
OFDMA-based co-channel femtocell
Hair rollers
Image input/output apparatus
Electric motor vehicle
Method and apparatus for controlling flatness of polished semiconductor wafer
Wheel suspension for a wheel driven by an endless transmission
Training signal detecting apparatus
LED light bulb