292 results about "Ferrite pearlite" patented technology

The invention relates to a medium-carbon ferrite-pearlite non-quenched and tempered steel which comprises the following components in percentage by weight: 0.35-0.43% of C, 0.30-0.80% of Si, 1.00-1.60% of Mn, 0.10-0.30% of Cr, 0.06-0.20% of V, 0.10-0.30% of Ni, at most 0.035% of P, 0.040-0.075% of S, 0.010-0.060% of Alt, 100-200*10<-4>% of N, and the balance of Fe and inevitable impurities. The medium-carbon ferrite-pearlite non-quenched and tempered steel has the characteristics of high strength and high toughness, and the plasticity of the hot rolled steel can still achieve the level of 40Cr or 40MnB quenched and tempered steel under the condition of no quenching and tempering treatment. The invention also relates to a manufacturing method of the medium-carbon ferrite-pearlite non-quenched and tempered steel.

The invention aims at providing a V-N microalloyed Q550 grade medium plate and a preparation method thereof which are specific to the condition that in the prior art, the Q550 grade medium plate expensive alloy is in large consumption and the preparation process is complex. The chemical constitutions of the steel are as follows by weight percentage: 0.06 to 0.12 percent of C, 1.20 to 2.00 percent of Mn, 0.10 to 0.50 percent of Si, 0.002 to 0.01 percent of S, 0.003 to 0.01 percent of P, 0.01 to 0.05 percent of Al, 0.06 to 0.15 percent of V, 0.01 to 0.02 percent of N and the balance of Fe and other unavoidable impurities; the preparation method comprises the steps of heating a steel billet to 1000 to 1200 DEG C along with a furnace and performing heat preservation for 3 to 4 hours, and further carrying out hot rolling on the steel billet to form a hot rolled plate being 20 to 50mm in thickness, wherein the beginning temperature and the finishing temperature in a rough rolling stage are respectively 1030 to 1150 DEG C and 980 to 1020 DEG C, and the beginning temperature and the finishing temperature in a finish rolling stage are respectively 908 to 925 DEG C and 820 to 845 DEG C; cooling the plate by water to 545 to 650 DEG C after the hot rolling, and then cooling by air to room temperature. The plate is a high-toughness ultra-low-carbon medium-manganese medium plate, and the metallographic structure of the plate is a fine crystalline ferrite, a pearlite and an acicular ferrite; the method is simple in operation process, has no need of quenching and tempering treatment, and is easy to realize industrial production.

The invention discloses 12.0-16.0 mm thick high-toughness 700MPa grade automobile beam steel and a production method thereof. The beam steel comprises the following chemical components of, in percentage by weight, 0.06 %-0.0 9 % of C, 0.10 %-0.30 % of Si, 1.60 %-1.90 % of Mn, smaller than or equal to 0.020 % of P, smaller than or equal to 0.005 % of S, 0.020 %-0.050 % of Alt, 0.04 %-0.06 % of Nb,0.06 %-0.10 % of Ti, smaller than or equal to 0.0050 % of N, and the balance Fe and inevitable impurities. The invention also discloses the production method of the beam steel. According to the beam steel and the method, the metallographic structure of the automobile beam steel is ferrite and pearlite, wherein the content of the pearlite is smaller than 10 %, and the grain size is larger than or equal to 12 level; and a rolling technology is optimized to produce the automobile beam steel which is thick and good in strength and toughness matching, so that the specification range of the automobile beam steel with the strength level is widened.

A method of assembling a hinge conveyor chain includes providing adjacent conveyor links formed from a ferritic-pearlitic stainless steel, wherein the adjacent links have interdigitating link ends with openings for receiving a pin, and inserting a pin having a radially outwardly facing surface formed from a steel alloy with more than 0.6 wt. % of carbon and more than 12 wt. % of Cr through the openings of the interdigitating link ends to pivotally link the adjacent links.