Cr5 series hot work die steel

Abstract

The invention provides Cr5 series hot work die steel which comprises, by weight, 0.40-0.48% of C, 0.20-1.2% of Si, 0.40-0.80% of Mn, no more than 0.020% of P, no more than 0.010% of S, 4.80-5.50% of Cr, 1.40-2.0% of Ni, 0.80-1.50% of Mo, 0.50-0.70% of V, 0.50-1.00% of W, 0-0.75% of Co, 0.01-0.20% of Al, 0.02-0.20% of Nb, and the balance Fe. The chemical composition formula of the novel Cr5 series hot work die steel provided by the invention is recorded as the YB5 series, and compared with existing Cr5 series (H13) hot work die steel, the YB5 series die steel is higher in C content and Mn content and lower in Si content (YB5A and YB5C), Mo content and V content, and Ni, W, Co (YB5C) and Al (YB5A and YB5C) are added. Accordingly, the toughness of the steel is improved, and the high-temperature strength and creep resistance are improved.

Description

technical field [0001] The invention belongs to the field of iron-based alloys, and in particular relates to an alloy used for forging dies and its preparation and application. Background technique [0002] Die is the main process equipment of die forging, and its life directly affects the quality, cost and efficiency of forgings. The cost of forging dies accounts for 30% to 45% of the cost of forgings (note: due to the small batch of forgings, the cost of forging dies accounts for a large proportion). Due to the poor service conditions of the forging superalloy die, the die cavity bears a large impact force, and is in a high temperature environment above 550°C for a long time, causing serious problems of die deformation, wear, collapse and collapse. [0003] 5CrNiMo and 5CrNiMoV are the main mold materials in the current industry (GB / T11880-89 Die Forging Hammer and Large Mechanical Forging Machine Module Technical Specifications); GB1299-2000 Alloy Tool Steel; "my country...

AI Technical Summary

Problems solved by technology

Among them, 5CrNiMo die steel has poor thermal strength and wear resistance, and the die should not be placed in a high temperature environment above 500 °C for a long time. For example, on 4000t forging equipment, 5CrNiMo die steel is used without exception, but it is used in 18,000 tons and 35,500 tons. The problems of die wear, slump and collapse on hammer forging equipment are more serious

5CrNiMoV is a large-scale hammer forging die material that was popularized and applied in 2013. 5CrNiMoV die steel has relatively good thermal strength and wear resistance, which can basically meet the needs of blade steel forging dies, but the die should not be in a high temperature environment above 550 ° C for a long time

But 45Cr2 and 5Cr2 are easy to crack

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