Chromium alloy large profile steel finishing roller and manufacturing method thereof

Abstract

The invention discloses a chromium alloy large profile steel finishing roller and a manufacturing method thereof. The manufacturing method comprises the following specific manufacturing steps that theroller is prepared from the following raw material of, in percentage by weight, 0.35-%0.65% of carbon, 0.45%-0.75% of silicon, 0.60%-0.80% of manganese, 0.60%-1.00% of nickel and 4.00%-6.00% of chromium, 0.50%-0.80% of vanadium, furnace charge is added into a power frequency electric furnace, current low-power operation is carried out, rapidly heating at high power is carried out when the furnacecharge enters a critical temperature, alloy is added into the furnace charge supplemented after the furnace charge is completely molten, slagging, removing residual impurity elements and gas elementsare sequentially carried out by using a slagging agent after several minutes, other alloy elements are activated by using active elements, and organically fusing is carried out, wherein a top pouringprocess is adopted for pouring, and the hot box opening process is adopted for rolling. The prepared roller has the advantages of refined microstructure grains, high hardness, small fall, good wear resistance, excellent toughness and strength, strong hot crack resistance and excellent rolled material surface quality.

Description

technical field [0001] The invention relates to the technical field of finishing rolls, in particular to a chromium alloy large section steel finishing roll and a manufacturing method thereof. Background technique [0002] The large section steel finishing stand must ensure the dimensional accuracy and surface quality of the profile, and realize negative tolerance rolling. Therefore, the finishing rolls must have excellent wear resistance, high yield strength, toughness and strong thermal cracking resistance. [0003] At present, nickel-chromium-molybdenum pearlitic nodular graphite wireless chilled cast iron rolls are mainly used for large-scale steel finish rolls in my country. This is necessary for the production of channel steel, angle steel, I-beam, and U-shaped steel for mining. , Due to the large difference in the hardness of the roll body, the single groove rolling capacity of this type of roll is low, and the groove change operation and roll change operation are freq...

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Problems solved by technology

[0003] At present, nickel-chromium-molybdenum pearlitic nodular graphite wireless chilled cast iron rolls are mainly used for large-scale steel finish rolls in my country. For the production of channel steel, angle steel, I-beam, and U-shaped steel for mining, the roll body has a deep pass. , due to the large difference in the hardness of the roll body, the single groove rolling capacity of this type of roll is low, and the groove change operation and roll change operation are frequent, so the roll consumption increases, the mill operation rate is low, and the surface quality of the rolled material is affected

Some steel mills use high-carbon semi-steel rolls and high-carbon graphite steel rolls. The high-carbon semi-steel with a carbon content of more than 1.7% has a hardness of 50-65HSD, and the content of nickel-chromium-molybdenum alloy elements increases, and the roll body structure appears cast shellfish. It shows good wear resistance, but because the content of carbon and carbide is more than 5%, sometimes it exists in block field or network form, which will form a certain loose area in the part of the roll and the core, which directly affects the roll. Tensile strength, even cause overloading and roll breakage accidents

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