High-toughness and ultrahigh-strength wear-resistant steel plate and production method thereof

Abstract

The invention provides a high-toughness and ultrahigh-strength wear-resistant steel plate and a production method thereof. The steel comprises the following chemical compositions by mass percent: 0.15-0.26% of C, 0.20-0.55% of Si, 1.0-1.60% of Mn, P less than or equal to 0.020%, S less than or equal to 0.010%, 0.00-0.60% of Mo, 0.00-0.50% of Ni, 0.20-1.00% of Cr, 0.01-0.05% of Ti, 0.02-0.04% of Als, 0.0005-0.004% of B and the balance Fe and inevitable impurities. The production method of the steel comprises the following steps: high clean steel smelting, hot metal desulphurizing, converter top-bottom blowing, vacuum processing and blank casting, in particular to plate blank heating, rough rolling, finish rolling and heat treatment technology parameter controlling. The chemical compositionsof the steel contain no V, Mo or Ni, or contain less Mo and Ni, therefore, the steel plate is low in alloy content and fine in toughness and can be widely applied to the mines and construction machinery products, which feature bad working conditions and have high requirements on steel properties.

Description

technical field [0001] The invention relates to the field of low-alloy steel manufacturing, and relates to a high-toughness and ultra-high-strength wear-resistant steel plate and a production method thereof. Background technique [0002] Wear-resistant steel plates are widely used in mechanical products such as bulldozers, loaders, excavators, All kinds of mining machinery, etc. However, with the development of machinery manufacturing industry, higher requirements are put forward for the production of wear-resistant steel. The strength and hardness of wear-resistant steel tend to be higher, so as to be suitable for harsh working environments and reduce the weight of the fuselage. Better matching of strength and toughness is required to improve the service life of equipment. Due to the increasingly prominent role of welding technology in mechanical production, it is required that wear-resistant steel should have better welding performance. At the same time, alloy addition...

AI Technical Summary

Problems solved by technology

For example, the patent No. ZL 200510078257.X announced on January 7, 2009, named "high-strength wear-resistant steel and its manufacturing method", has high strength and toughness indicators, but high carbon content and weldability not good

Another example is the invention patent application of Shenyang Heavy Machinery Group published on May 13, 2009, titled "A high-strength wear-resistant steel plate that can be welded without heat treatment and its preparation method", and its steel has good toughness and weldability But the strength and hardness are lower

The patent No. ZL 200810047196.4 published by WISCO on August 27, 2008, titled "A super-high-strength wear-resistant steel plate and its production method", the chemical composition mass percentage of the patent is C 0.10-0.17%, Si 0.25-50% , Mn 1.2~1.5%, P≤0.018%, S≤0.008%, Cr 0.20~0.50%, Ni 0.25~0.50%, Mo0.10~0.40%, Als0.02~0.06%, B≤0.005%, RE≤ 150g / ton steel, the patent adopts controlled rolling + quenching and tempering treatment, the hardness is between HBW380~400, the invention has good wear resistance and toughness, but it adds a certain amount of Mo and RE, which makes the cost Higher, and the hardness is relatively low

There is also the European patent "An abrasion resistant steel", patent number EP0527276, although the toughness is very high, A 50 Up to 23%, but it adds a certain amount of Mo, V and more Cr microalloying elements, so that the welding performance is not very good

Images