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Novel manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel

A cold work die steel, high carbon and high chromium technology, applied in the field of cold work die steel forging round steel manufacturing, can solve the problem of serious eutectic carbide inhomogeneity, deterioration of carbide segregation, and increase of surface crack defects in large section forging materials and other problems, to achieve the effect of improving hot working plasticity, preventing crack defects and stabilizing melting speed

Active Publication Date: 2012-04-18
FUSHUN SPECIAL STEEL SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to disclose a new process for manufacturing round steel forged with high-carbon and high-chromium cold-working die steel of Φ300mm~Φ700mm, so as to solve the problem of carbide segregation and deterioration of as-cast structure of large steel ingots, and the unevenness of eutectic carbides in forging materials with large cross-sections. The problem of severe cracking and the increase of internal cracks and surface crack defects in the forging process

Method used

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  • Novel manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel
  • Novel manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel
  • Novel manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The production size and shape are Φ300mm round steel.

[0046] EAF+LF+VD method is used for smelting, LF furnace uses 4.25 high alkalinity slag, [FeO] content in slag is 0.61%, white slag time is 35min; VD vacuum degree is ≤1mbar, keep it for 15min, and softly blow Ar gas for 10min before pouring , casting 5t ingots, the pouring temperature is 1471°C, and the 5t ingots are sent to the next branch factory.

[0047]The melting analysis results of the chemical composition of steel ingots are shown in Table 1.

[0048] Table 1 chemical composition

[0049]

[0050] The steel ingot is subjected to high-temperature homogenization treatment, the heating temperature is 1178°C, and the holding time is 4h.

[0051] The steel ingot is forged with eight fires, which are divided into three steps: the first step is symmetrical deformation forging, the first three fires use the upper and lower equal width flat anvils to lightly press the steel ingot, the deformation of each pass ...

Embodiment 2

[0056] The production size and shape are Φ480mm round steel.

[0057] EAF+LF+VD method is used for smelting, LF furnace uses 4.21 high alkalinity slag, the [FeO] content in the slag is about 0.63%, and the white slag time is 33min; VD vacuum degree is ≤1mbar, keep it for 15min, and blow Ar gas softly before pouring In 10 minutes, 9t ingots were poured, the pouring temperature was 1468°C, and the 9t ingots were sent to the next branch factory.

[0058] The melting analysis results of the chemical composition of steel ingots are shown in Table 3.

[0059] Table 3 chemical composition

[0060]

[0061] The steel ingot is subjected to high-temperature homogenization treatment, the heating temperature is 1177°C, and the holding time is 6h.

[0062] The steel ingot is forged with nine fires, which is divided into three steps: the first step is symmetrical deformation forging, the first four fires use the upper and lower flat anvils to lightly press the steel ingot, the deformat...

Embodiment 3

[0067] The production size and shape are Φ510mm round steel.

[0068] EAF+LF+VD method is used for smelting, LF furnace uses 4.23 high alkalinity slag, the [FeO] content in the slag is about 0.62%, and the white slag time is 32min; VD vacuum degree is ≤1mbar, keep it for 15min, and blow Ar gas softly before pouring For 10 minutes, cast a Φ700mm round electrode rod, the pouring temperature is 1469°C, the electrode rod is red and annealed, and the annealing temperature is 890°C. Ternary slag-based CaF is used in electroslag remelting 2 : Al 2 o 3 : MgO=65%: 30%: 5%, the amount of remelting slag is 370kg, the remelting voltage is controlled at 75V ~ 82V, the remelting current is controlled at 16000A ~ 20000A, the electroslag remelting ingot type is Φ930mm electroslag ingot, The electroslag ingot is warmly sent to the next branch factory. The results of the chemical composition analysis of the electrode rod are shown in Table 5.

[0069] Table 5 Chemical Composition

[0070]...

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Abstract

The invention discloses a manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel, and the purpose is to solve the problems of quite severe ununiformity of large-section forging material eutectic carbides and the increase of defects of internal cracks and surface cracks during the forging process caused by segregation deterioration of cast structure carbides of large steel ingots. By using steel-making technical measures such as LF refining, VD degassing, aluminium wire feeding, and the like, the invention improves the molten steel cleanliness, the control of electroslag remelting output power, and the homogenization treatment before forging, and improves the segregation of eutectic carbides and the hot-working plasticity of steel; by controlling the forging heating numbers and various deformation amounts of large high-carbon high-chromium steel ingots, large granular carbides are crushed; the ununiformity of eutectic carbides is improved; crack defects during the forging process are prevented; and the produced high-carbon high-chromium steel large-section forging materials has ununiformity of eutectic carbides of up to grade 4-grade 6; the results of ultrasonic inspection are at good levels of E / e grade, D / d grade.

Description

technical field [0001] The invention relates to a method for manufacturing cold-work die steel forged round steel, in particular to a new process for manufacturing Φ300mm-Φ700mm high-carbon and high-chromium cold-work die steel forged round steel. Background technique [0002] Alloy steel die steel can be divided into cold work die steel, hot work die steel and plastic die steel, among which cold work die steel is mainly used to manufacture various molds that press and form metal materials at room temperature; there are many types of cold work dies , A wide range of applications, its output value accounts for about 1 / 3 of the total output value of the mold. According to the working conditions of the mold and the batch of products produced, the cold work die steel can be divided into: carbon tool steel T8~T12 with low hardenability, 9SiCr and CrWMn with high hardenability, and 6CrW2Si with high toughness etc., high-carbon high-chromium Cr12Mo1V1, Cr6WV ​​with high hardenabil...

Claims

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Application Information

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IPC IPC(8): C22C38/24C21C7/10C21C7/076C22B9/18C21D8/00B21J5/06B21J1/06
CPCY02P10/20
Inventor 顾容刘振天杨清凯王琳汝亚彬王海江陈庆新于丹赵智刚牟风
Owner FUSHUN SPECIAL STEEL SHARES
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