6CrW2SiMoV for large/medium-sized roller

Abstract

The invention relates to a high performance and quality big-and-middle-sized steel applied to rollers: 6CrW2SiMoV, belonging to the field of alloy junction tool. According to wt%, the chemical components comprise: C: 0.60-0.70, Si: 0.5-0.8, Mn: less than or equal to 0.40, P: 0.0001-0.02, S: 0.0001-0.015, Cr: 1.20-1.50, W: 2.20-2.70, Mo: 0.20-0.40, V: 0.05-0.15, N: 0.02-0.05, and the balance of Fe.In the invention, elements such as Cr, Mo, V, N and the like are added to further strengthen comprehensive performance of the components. In the process of casting and heat treatment, more dispersingcarbide precipitation is adopted to restrict growth of crystal grains, so that relatively high obdurability can be obtained at the state of tempering, and higher quenching hardness and abrasive resistance are provided; micro alloy element of vanadium exists in the steel in the form of compound and in the state of solid solution, which is expressed in that the carbonitride thereof is precipitateddueto deformation induction to effectively pin austenite crystal boundary to prevent the crystal grains from growing up; meanwhile, carbonitride of the elements of V and the like are precipitated oncrys tal boundary and dislocation to prevent recrystallization and dislocation movement, inhibit recrystallization process, reduce thermal hypersensitivity of the steel, increase wearing resistance ofthe materials and enhance anti-oxidation decarburization sensitivity. As a result, the roller materials have better material property and stability, thus being capable of replacing import products andmeeting the request for utilization of modern rollers.

Description

technical field [0001] The invention belongs to the field of alloy tool steel. Background technique [0002] The domestic steel rolling industry has developed rapidly by relying on a large amount of investment and the introduction of the most advanced foreign equipment, while the rolling industry mainly relies on self-reliance, continuous technical transformation, and expansion to promote development. Compared with the steel rolling industry, the development of the roll industry is slower and the experience is more difficult. The supply of low-grade domestic roll products exceeds the demand, and the products are surplus. Change. In recent years, the rolls used in large-scale H-beam mills also need to rely on imports. Large-scale steel and strip mills urgently need composite semi-steel roll sleeves, high-chromium steel, semi-high-speed steel, high-speed steel rolls, and large deep-hardened layer work rolls and supports. Although small batches of rolls have been produced in ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the existing impact-resistant steel 6CrW2Si to further strengthen the overall comprehensive performance of the material by adding elements such as Cr, Mo, V, N, etc., the present invention proposes a method of strengthening with trace alloy elements, improving the overall performance of tool steel, and expanding the tool material. It provides a new idea for solving high-performance and high-quality large and medium-sized roll steel, provides innovative technology for performance optimization of high-performance and high-quality roll steel, and promotes the complete localized production of the steel rolling industry