Fatigue-resistant and corrosion-resistant round steel for forging and pressing and preparation method thereof

Abstract

The invention discloses fatigue-resistant and corrosion-resistant round steel for forging and pressing and a preparation method thereof.The fatigue-resistant and corrosion-resistant round steel comprises the following chemical components in percentage by mass: 0.42 to 0.49 percent of C, 1.00 to 1.20 percent of Si, 1.50 to 1.70 percent of Mn, 0.1 to 0.13 percent of V, 0.50 to 1.20 percent of Cr, 0.1 to 0.30 percent of Ni, 0.10 to 0.30 percent of Mo, 0.035 to 0.075 percent of S, less than or equal to 0.035 percent of P, 0.033 to 0.058 percent of Al, less than or equal to 0.02 percent of Cu, less than or equal to 20 * 10 <-4 > percent of O, less than or equal to 1.5 * 10 <-4 > percent of H, 80 * 10 <-4 > to 100 * 10 <-4 > percent of N, 0.05 to 0.10 percent of Sn and the balance of iron and inevitable impurities. The prepared steel has the advantages of being good in mechanical performance, fatigue resistance and corrosion resistance, low in manufacturing cost, short in manufacturing period, capable of being directly used for the forging and pressing procedure without thermal refining and the like, and can be used for hot forging of automobile parts such as crankshafts and connecting rods.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a fatigue-resistant and corrosion-resistant round steel for forging and a preparation method thereof. Background technique [0002] Crankshafts, connecting rods, etc. are the core of auto parts. The performance of the crankshaft affects the quality of the engine. Therefore, the crankshaft must not only have high strength and hardness, certain toughness, but also corrosion resistance and fatigue resistance. Since the parts of the car (crankshaft, connecting rod) are subjected to cyclic loads during work, and fatigue damage is a hidden gradual process, this makes the parts of the car with crack sources (crankshaft, connecting rod) enter A process of fatigue damage. Due to the concealment of fatigue damage, the failure of auto parts (crankshaft, connecting rod) is sudden and will cause huge losses. Therefore, the fatigue life should be estimated in advance, so as to ensure that t...

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Problems solved by technology

[0003] Chinese patent CN 105970102 A discloses a high-impact-toughness alloy steel for automobile connecting rod springs. Its yield strength and tensile strength are not ideal, and indicators such as hardness, fatigue resistance and corrosion resistance are not mentioned.

[0004] Chinese patent CN 103266287 A and Chinese patent CN 110791708 A disclose a medium-carbon ferrite-pearlite non-quenched and tempered steel and a non-quenched and tempered steel for auto parts, neither of which mentions fatigue resistance and corrosion resistance

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