High strength non-quenched and tempered free machining steel for automobile connecting bar and technological process thereof
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
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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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