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Preparation Method for Improving the Inhomogeneity of Eutectic Carbide in Cr12 Die Steel

A technology of eutectic carbide and uniformity is applied in the field of preparation of improving the non-uniformity of eutectic carbide of Cr12 forging work die steel, which can solve the problem that the non-uniformity is difficult to meet the requirements, and reduce the difficult deformation area. , The effect of reducing the degree of segregation and improving the surface plasticity

Active Publication Date: 2019-01-22
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, customers require forging modules (thickness ≥ 200mm) eutectic carbide inhomogeneity level ≤ 4.0, but it is often difficult to achieve the inhomogeneity obtained by the preparation method of eutectic carbide in Cr12 type forged cold working die steel in the existing technology Require

Method used

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  • Preparation Method for Improving the Inhomogeneity of Eutectic Carbide in Cr12 Die Steel
  • Preparation Method for Improving the Inhomogeneity of Eutectic Carbide in Cr12 Die Steel
  • Preparation Method for Improving the Inhomogeneity of Eutectic Carbide in Cr12 Die Steel

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Embodiment 1

[0021] A preparation method for improving the unevenness of eutectic carbides in Cr12 type die steel, such as figure 1 , 2 As shown, the process flow of the method is as follows: electric furnace smelting + vacuum refining + casting electrode blank + electrode blank annealing, hot-cut riser → electroslag + heat transfer → heating + upsetting forging to finished product → annealing → blanking, flaw detection, physical and chemical testing; This preparation method comprises the steps:

[0022] Step S01: steelmaking, electric furnace smelting + vacuum refining + low-temperature casting electrode blank (φ500), the chemical composition is shown in Table 2 below;

[0023] Table 2 Chemical composition

[0024]

[0025] Step S02: Anneal the electrode blank, measure the temperature of the electrode blank ingot body after the electrode is eagerly cut the riser, the measured minimum temperature is 380°C, and the electrode blank is kept at 400-450°C for 2.5h as required, and the hold...

Embodiment example 2

[0031] A preparation method for improving the unevenness of eutectic carbides in Cr12 type die steel, such as figure 1 , 3 As shown, the process flow of the method is as follows: electric furnace smelting + vacuum refining + casting electrode blank + electrode blank annealing, hot-cut riser → electroslag + heat transfer → heating + upsetting forging to finished product → annealing → blanking, flaw detection, physical and chemical testing; This preparation method comprises the steps:

[0032] Step S01: Steelmaking, electric furnace smelting + vacuum refining + low temperature casting electrode billet (φ600), the smelting composition is shown in Table 3 below;

[0033] Table 3 Chemical composition

[0034]

[0035] Step S02: Anneal the electrode blank, measure the temperature of the electrode blank ingot after the electrode is eagerly cut the riser, the measured minimum temperature is 545°C, and the electrode blank is kept at 600-650°C for 3 hours as required, and the holdi...

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Abstract

The invention relates to a preparation method for improving the unevenness of eutectic carbide in Cr12 type forged and cold formed mould steel. According to the preparation method for improving the unevenness of the eutectic carbide in the Cr12 type mould steel, a smelting method of electric furnace smelting along with vacuum refining is adopted, and an electrode billet is produced through low temperature pouring; after annealing and riser cutting are conducted on the electrode billet, electro slagging is conducted on the electrode billet, an esr ingot is hot conveyed to a forging workshop, firstly pre-drawing out is conducted by adopting an up and down V-shaped anvil, upsetting is conducted on a billet material after pre-drawing out, upsetting adopts rivet upsetting, drawing out adopts a two-light-and-one-heavy forging method, and chamfering forging is conducted on a main deformation stage. By adopting the preparation method for improving the unevenness of the eutectic carbide in the Cr12 type mould steel, the unevenness level of the eutectic carbide in the Cr12 type forged and cold formed mould steel (the thickness is 200-500 mm) is less than or equal to the 4.0 level.

Description

technical field [0001] The invention relates to a preparation method for improving the unevenness of eutectic carbide in Cr12 type forging cold working die steel. The thickness range of the Cr12 type forging cold working die steel is 200mm-500mm. Background technique [0002] Cr12 type cold work die steel is high carbon and high chromium, which belongs to ledeburite steel, has high deformation resistance, poor plasticity, and small forging temperature range. The process is strictly designed and controlled to ensure the production of products that meet the needs of users. [0003] GB-T1299-2014 tool and die steel standard stipulates that the diameter or side length of Cr12Mo1V1 steel is greater than 120mm, and the qualified level of eutectic carbide unevenness is 6.0 or determined through negotiation between the supplier and the buyer. For Cr12Mo1V1 steel with a thickness greater than 120mm, manufacturers generally do not guarantee Eutectic carbide inhomogeneity grade. At p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18C21D8/00C22C38/02C22C38/04C22C38/24C22C38/22C22C38/20
CPCC21D8/00C22B9/18C22C38/02C22C38/04C22C38/20C22C38/22C22C38/24
Inventor 陈俸军孙振环王兴旺胡建成周许
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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