High-strength abrasion-resisting steel plate and production method thereof

Abstract

The invention provides a high-strength abrasion-resisting steel plate and a production method thereof. The chemical components of the high-strength abrasion-resisting steel plate include, by weight, 0.25-0.30% of C, 0.3-0.5% of Si, 0.40-1.00% of Mn, 0.6-1.2% of Cr, 0.15-0.4% of Mo, 0.01-0.03% of Nb, smaller than or equal to 0.50% of Ni, smaller than or equal to 0.50% of Cu, 0.0005-0.0022% of B, 0.025-0.04% of Ti, 0.020-0.045% of Als, smaller than or equal to 0.015% of P and smaller than or equal to 0.005% of S, wherein Ti/N is greater than or equal to 3.4. During refining, molten steel [N] is controlled to be smaller than or equal to 0.0080%, [O] is controlled to be smaller than or equal to 0.0020%, it is ensured that the effective boron content is 0.0010-0.0020%, and stacking for slow-cooling is performed for 48 hours or more after continuous casting. Two-stage rolling control is adopted, the finish rolling temperature at the first stage is 980-1050 DEG C, out-line quenching is conducted on plate blanks with the thickness greater than 50 mm at the second stage, swinging is performed at the low-pressure section of a quenching machine, on-line quenching is conducted on plate blanks with the thickness smaller than or equal to 50 mm, and residual heat is utilized to perform self tempering. The high-strength abrasion-resisting steel plate has lower carbon and manganese contents and good weldability, the surface hardness is greater than 550 HB, and the toughness at the low temperature of -40 DEG C is greater than 30 J, and the maximum thickness can be up to 120 mm.

Description

technical field [0001] The invention belongs to the metallurgy field of metal materials, and in particular relates to a 550HB grade high-strength wear-resistant steel plate and a production method thereof. Background technique [0002] Wear-resistant steel plates can be widely used in fields such as energy, transportation, agricultural machinery, mining equipment, engineering machinery, and cement equipment. High-carbon and high-manganese series have been widely used as classic wear-resistant steels for more than a hundred years. However, when the impact of the crushed material is not strong, because the work hardening performance of high manganese steel cannot be fully exerted, the high manganese steel liner shows the weakness of fast wear and short service life; Grinding steel has the characteristics of good wear resistance and toughness, simple production process and reasonable economy, and its development and application develop rapidly. [0003] The wear-resistant stee...

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Problems solved by technology

[0013] 3. The production process is complicated, and tempering heat treatment is required after quenching

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