High strength non-quenched and tempered free machining steel for automobile connecting bar and technological process thereof
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A technology for automotive connecting rods and free-cutting steels, which is applied in the field of high-strength non-quenched and tempered free-cutting steels, can solve problems such as not meeting technical conditions, and achieve the effect of simple production processes
Inactive Publication Date: 2009-01-07
WUHAN IRON & STEEL (GROUP) CORP
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Embodiment 1
[0047] Steel A of the present invention contains C: 0.33%, Si: 0.60%, Mn: 0.95%, P: 0.010%, S: 0.035%, Cr: 0.20%, V: 0.22%, N: 0.011%, Al: 0.030% , the rest are iron and unavoidable impurities; continuous casting slab heating temperature: 1200°C, heating time 160min, starting rolling temperature: 1100°C, finishing rolling temperature: 900°C, reduction: 16; post-rolling cooling rate: 40°C / min, put into the pit to cool slowly after bundling. The grain size of the hot-rolled material is 9.0, the proportion of pearlite is 80%, the interlamellar spacing of pearlite is 230nm, and the mechanical properties are: Rm: 1000MPa, Rel: 750MPa, A: 18%, Z: 30%.
Embodiment 2
[0049] Steel B of the present invention contains C: 0.36%, Si: 0.66%, Mn: 1.01%, P: 0.011%, S: 0.045%, Cr: 0.27%, V: 0.27%, N: 0.012%, Al: 0.035% , the rest is iron and unavoidable impurities; continuous casting slab heating temperature: 1250°C, heating time 160min, starting rolling temperature: 1120°C, finishing rolling temperature: 910°C, reduction: 16; cooling rate after rolling: 60°C / min, put into the pit to cool slowly after bundling. The grain size of the hot-rolled material is 9.5, the proportion of pearlite is 84%, the interlamellar spacing of pearlite is 200nm, and the mechanical properties are: Rm: 1050MPa, Rel: 770MPa, A: 16%, Z: 25%.
Embodiment 3
[0051] Steel C of the present invention contains C: 0.38%, Si: 0.60%, Mn: 1.00%, P: 0.010%, S: 0.040%, Cr: 0.25%, V: 0.25%, N: 0.013%, Al: 0.035% , the rest are iron and unavoidable impurities; continuous casting slab heating temperature: 1150°C, heating time 160min, starting rolling temperature: 1050°C, finishing rolling temperature: 850°C, reduction: 14; post-rolling cooling rate: 70°C / min, put into the pit to cool slowly after bundling. The grain size of the hot-rolled material is 9.5, the proportion of pearlite is 86%, the interlamellar spacing of pearlite is 170nm, and the mechanical properties are: Rm: 1100MPa, Rel: 790MPa, A: 16%, Z: 24%.
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Abstract
The invention discloses a high-intensity non-quenching and tempering easy-cutting steel used for a vehicle connection rod and a technical method thereof. The invention starts from the principle of improving the intensity of the non-quenching and tempering easy-cutting steel and leads the anti-tension intensity of the non-quenching and tempering easy-cutting steel containing 0.30 to 0.40 percent of carbon to be 1000MPa and the yield strength to be 750MPa by adjusting the components. The technical scheme of the invention is: the high-intensity non-quenching and tempering easy-cutting steel used for a vehicle connection rod consists of the elements of C, Si, Mn, Al, P, S, Cr, V, N and Fe; the weight percentages of the component elements are: 0.30 to 0.4 percent of C, 0. 50 to 0.70 percent of Si, 0.80 to 1.20 percent of Mn, equal to or less than 0.040 percent of P, 0.030 to 0.060 percent of S, 0.010 to 0.040 percent of Al, 0.10 to 0.40 percent of Cr, 0.10 to 0.30 percent of V, 010 to 0.015 percent of N and the rest is Fe and unavoidable impurities. The heating temperature of a continuous casting blank is 1200 DEG C; the heating time is 160min; the start rolling temperature is 1100 DEG C; the final rolling temperature is 900 DEG C; the pressing volume is 16; the cooling speed after rolling is 40 DEG C/min; after bundling, the components are thrown in a pit and slowly cooled.
Description
technical field [0001] The invention relates to a high-strength non-quenched and tempered free-cutting steel for automobile connecting rods and a process method thereof, in particular to a chemical composition and a production process of high-strength free-cutting steel used for producing automobile engine connecting rods. Background technique [0002] Before the present invention proposes, non-quenched and tempered free-cutting steel has been widely used in the automobile industry, and it is used to manufacture crankshafts, connecting rods, steering knuckles, front beams and other parts on automobiles that require strength and certain cutting performance. These parts used to be treated with medium carbon steel (carbon steel or alloy steel) through quenching and tempering (high temperature tempering after quenching). Since the oil crisis, all countries in the world have tried to save energy, and due to the development of metallurgical technology and steel thermal processing ...
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