A 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...

Examples

Embodiment 1

[0108] The preparation method of Cr5 series hot working die steel is characterized in that it comprises steps: electric furnace smelting, LF furnace refining (LADLE FURNACE is the ladle refining furnace), vacuum degassing (VD), mold casting, annealing, electroslag remelting (ESR ), slow cooling, annealing, forging, normalizing, spheroidizing annealing, hydrogen expansion, roughing, inspection, finishing, quenching and tempering, finishing, inspection, and production.

[0109] By controlling the composition of molten steel, the prepared die steel contains C0.44%, Si0.40%, Mn0.60%, P0.010%, S0.002%, Cr5.20%, Ni1. 60%, Mo 0.90.%, V 0.60.%, W 0.55%, Co 0.09%, Al 0.10%, Nb 0.040%, the balance Fe. The obtained product is YB5A steel.

Embodiment 2

[0111] The method of smelting is with embodiment 1. By controlling the composition of molten steel, the prepared mold steel contains C 0.43%, Si 1.00%, Mn 0.40%, P 0.012%, S0.0015%, Cr4.80%, Ni1.40.% in weight % , Mo1.00%, V0.50%, W0.80%, Co0.090.%, Al0.010%, Nb0.030%, the balance Fe. The obtained product is YB5B steel.

Embodiment 3

[0113] The method of smelting is with embodiment 1. By controlling the composition of molten steel, the prepared die steel contains 0.43% C, 0.40% Si, 0.60% Mn, 0.009% P, 0.001% S0, 5.20% Cr, 1.60% Ni, Mo1. 10%, V 0.60%, W 0.55.%, Co 0.53%, Al 0.20%, Nb 0.025%, the balance Fe. The obtained product is YB5C steel.

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...

Examples

Embodiment 1

[0108] The preparation method of Cr5 series hot working die steel is characterized in that it comprises steps: electric furnace smelting, LF furnace refining (LADLE FURNACE is the ladle refining furnace), vacuum degassing (VD), mold casting, annealing, electroslag remelting (ESR ), slow cooling, annealing, forging, normalizing, spheroidizing annealing, hydrogen expansion, roughing, inspection, finishing, quenching and tempering, finishing, inspection, and production.

[0109] By controlling the composition of molten steel, the prepared die steel contains C0.44%, Si0.40%, Mn0.60%, P0.010%, S0.002%, Cr5.20%, Ni1. 60%, Mo 0.90.%, V 0.60.%, W 0.55%, Co 0.09%, Al 0.10%, Nb 0.040%, the balance Fe. The obtained product is YB5A steel.

Embodiment 2

[0111] The method of smelting is with embodiment 1. By controlling the composition of molten steel, the prepared mold steel contains C 0.43%, Si 1.00%, Mn 0.40%, P 0.012%, S0.0015%, Cr4.80%, Ni1.40.% in weight % , Mo1.00%, V0.50%, W0.80%, Co0.090.%, Al0.010%, Nb0.030%, the balance Fe. The obtained product is YB5B steel.

Embodiment 3

[0113] The method of smelting is with embodiment 1. By controlling the composition of molten steel, the prepared die steel contains 0.43% C, 0.40% Si, 0.60% Mn, 0.009% P, 0.001% S0, 5.20% Cr, 1.60% Ni, Mo1. 10%, V 0.60%, W 0.55.%, Co 0.53%, Al 0.20%, Nb 0.025%, the balance Fe. The obtained product is YB5C steel.

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