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32results about How to "High r value" patented technology

Process for producing high-strength interstitial-free (IF) steel with high plastic strain ratio (r) value

ActiveCN102816975BHigh r valueR value increasedReduction rateSheet steel
The invention relates to the technical field of the auto sheet production process, and relates to a process for producing high-strength IF steel with a high r value. A P-Mn compound added 340 MPa high-strength IF steel is utilized, and the process comprises hot rolling, low-temperature finish rolling, direct online rapid annealing by using the rolled high temperature, rapid cooling till the temperature reaches the coiling temperature, and cold rolling and annealing to obtain a steel plate with 355 MPa extension strength and a 2.75 rolling direction r value. The temperature for hot rolling and finish rolling ranges from 550 DEG C to 850 DEG C, the finish rolling reduction rate is between 70% and 90%, the temperature of the finish rolling phase is below 650 DEG C, the finish rolling phase comprises more than two rolling passes, and the accumulated reduction rate is larger than 40%; the online annealing heating speed is between 30 DEG C / s and 50 DEG C / s, the annealing temperature is in a range of 800 DEG C to 820 DEGC, the heating time is between 10s and 20s, the coiling temperature is between 650 DEGC and 700 DEG C, the cold rolling reduction amount is in a range of 75% to 85%, the heating speed of the continuous annealing process is between 5 DEG C / s and 10 DEG C / s, the heat preservation temperature ranges from 810 DEG C to 830 DEG C, and the heat preservation time is between 100s and 180s.
Owner:UNIV OF SCI & TECH BEIJING

High chromium content ferrite stainless steel and manufacturing method thereof

The invention discloses high chromium ferritic stainless steel and a manufacturing method thereof. The high chromium ferritic stainless steel is characterized in that the high chromium ferritic stainless steel comprises chemical elements according to the following weight percentage: less than or equal to 0.015 percent of C, less than or equal to 0.020 percent of N, less than or equal to 1.0 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.010 percent of S, 20 to 25 percent of Cr, 0.30 to 0.50 percent of Cu, less than or equal to 0. 5 percent of Ti and Nb, and the balance being Fe, wherein (Ti / 48+Nb / 93) / (C / 12+N / 14) is more than 1.5. The manufacturing method comprises the: 1) a step of continuous casting or die casting, in which raw materials are primarily rolled into steel billets after the die casting; 2) a step of rolling, in which the final rolling temperature of steel plates is between 800 and 950 DEG C, and the gradual cooling is performed after the rolling; 3) a step of continuous annealing, in which the temperature is between 850 and 950 DEG C; 4) a step of the removal of oxide coating; 5) a step of cold rolling; and 6) a step of continuous annealing after the recrystallization. The ferritic stainless steel has the advantages of stronger corrosion resistance, higher plasticity and good deep drawability.
Owner:BAOSHAN IRON & STEEL CO LTD
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