Heat-treatment-free NM360 wear-resistant steel plate and manufacturing method thereof

Abstract

The invention provides a heat-treatment-free NM360 wear-resistant steel plate and a manufacturing method thereof. The heat-treatment-free NM360 wear-resistant steel plate comprises 0.15%-0.25% of C, 1.0%-2.5% of Si, 1.5%-2.5% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.005% of S, 0.010%-0.060% of Nb, 0.010%-0.060% of Ti, 0.010%-0.050% of V, 0.020%-0.060% of Als, 0.0010%-0.0030% of B, smaller than or equal-0.00015% of H, smaller than or equal to 0.0030% of N, smaller than or equal to 0.0030% of O and the balance Fe and inevitable inclusions. The manufacturing method of direct three-section cooling after rolling is adopted, the yield strength of the product is larger than or equal to 800 MPa, the tensile strength is larger than or equal to 1200 MPa, the cold bending performance is 180 degrees, D is equal to 4a and qualified, the technological process is short, the production cost is low, the product strength and hardness are high, the abrasion resistance is high, and the cold bending forming performance is good.

Description

technical field [0001] The invention relates to the technical field of wear-resistant steel production technology, in particular to a heat-free NM360 wear-resistant steel plate and a manufacturing method thereof. Background technique [0002] With the full implementation of the country's policy of advocating low-carbon emissions, energy saving and emission reduction, green environmental protection, and overhauling, lightweight, heavy-duty, and high service life have become an inevitable trend in the development of the commercial vehicle industry. Performance puts forward higher requirements, not only has high strength, high hardness, high toughness, but also has high wear resistance and cost economy. As one of the most direct and effective methods of lightweighting, the demand for ultra-high-strength steel, especially wear-resistant steel, is becoming more and more urgent. [0003] There are three main types of wear-resistant steel materials for industrial applications: hig...

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Problems solved by technology

[0004] However, martensitic wear-resistant steel, on the one hand, often adds precious alloying elements such as Cr, Mo, Ni, and rare earth to its chemical composition design, and the alloy composition design is complex and high in cost; on the other hand, its mainstream production technology is mainly thermal There are two heat treatment processes of rolling + quenching + tempering and hot rolling + offline tempering. The hardness and wear resistance of the material mainly depend on the heat treatment process. Not only the production process is long, the energy consumption is high, and the cost is high, but also the microstructure after heat treatment is Hard and brittle phase martensite, large internal stress, high yield strength ratio, limited cold-formation performance, can only guarantee 90°, D=6a (D-bending indenter diameter, a-sample thickness) qualified

[0005] The patent with the publication number CN 105861939 A published on August 17, 2016 is a method for producing NM360 steel, which adopts the microalloying composition design of Mo, Cr, Nb and Ti, and obtains it by controlled relaxation and ultra-rapid cooling process after rolling. NM360 grade wear-resistant steel, but its application production line is medium and thick plate production line, non-hot continuous strip rolling production line, and the product thickness specification is ≥ 8mm, not suitable for ≤ 6mm thin specification products

[0006] Publication No. CN107099731 A disclosed on August 29, 2017 is a method for producing thin-gauge high Ti wear-resistant steel NM360 by on-line quenching and an on-line quenching production of thin-gauge CN106987760 A disclosed on July 28, 2017 The method of high Ti wear-resistant steel NM400 is designed with Cr, Mo, Nb, Ti, B microalloying components, the alloy content is high, the cost is high, and the application production line is a short process of thin slab continuous casting and rolling, and the production process is different , not the traditional hot strip rolling process

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