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Aluminum-containing hot extrusion mold steel and production method thereof

A technology for extrusion dies and production methods, which is applied in the direction of coating, metal material coating process, and energy efficiency improvement. It can solve the problems of insufficient toughness and wear resistance of materials, so as to reduce the cost of alloys and improve surface wear resistance. high resistance to tempering

Inactive Publication Date: 2018-09-14
NINGBO HELI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a hot extrusion die steel, H13 steel contains relatively high molybdenum, chromium, vanadium and a certain amount of carbon in its chemical composition. Some liquefied carbides are present, resulting in insufficient toughness of the material
In addition, forming a high-hardness nitriding layer on the cavity channel of the hot extrusion die can significantly improve the life of the die and the surface quality of the extruded profile, so the hot extrusion die steel should have good nitriding ability, while the surface of the traditional H13 steel The hardness of nitriding treatment is 900-1000HV, and the wear resistance is not enough

Method used

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  • Aluminum-containing hot extrusion mold steel and production method thereof
  • Aluminum-containing hot extrusion mold steel and production method thereof
  • Aluminum-containing hot extrusion mold steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] C: 0.56%, Si: 0.20%, Mn: 0.24%, Cr: 3.00%, Mo: 0.42%, V: 0.36%, Al: 0.70%, P: 0.010%, S: 0.012%, Fe balance.

[0033] In this example, the process steps of preparation, heat treatment and surface treatment of economical aluminum-containing hot extrusion die steel are as follows:

[0034] 1. Electric furnace smelting: smelting in an electric arc furnace according to the above-mentioned ratio of alloying elements, the melting temperature is greater than 1500°C, casting into Ф400mm electrode rods and air cooling;

[0035] 2. Electroslag remelting: Place the poured steel ingot as a consumable electrode in the electroslag remelting device for electroslag remelting. The slag melting voltage is 55-65V, the current is 3500-5500A, and the electric system is: voltage 55~60V, current 11500~12500A, capping voltage 58~62V, current time 40min, electroslag remelting into 500Kg electroslag ingot;

[0036] 3. After electroslag remelting, hold at 800°C for 10 hours and then cool with th...

Embodiment 2

[0056] In this example, the chemical composition of economical aluminum-containing hot extrusion die steel is as follows:

[0057] C: 0.45%, Si: 0.21%, Mn: 0.23%, Cr: 3.00%, Mo: 0.30%, V: 0.30%, Al: 0.50%, P: 0.015%, S: 0.010%, Fe balance.

[0058] In this example, the process steps of preparation, heat treatment and surface treatment of economical aluminum-containing hot extrusion die steel are as follows:

[0059] 1. Electric furnace smelting: smelting in an electric arc furnace according to the above-mentioned ratio of alloying elements, the melting temperature is greater than 1500°C, casting into Ф400mm electrode rods and air cooling;

[0060] 2. Electroslag remelting: Place the poured steel ingot as a consumable electrode in the electroslag remelting device for electroslag remelting. The slag melting voltage is 55-65V, the current is 3500-5500A, and the electric system is: voltage 55~60V, current 11500~12500A, capping voltage 58~62V, current time 36min, electroslag remel...

Embodiment 3

[0081] In this example, the chemical composition of economical aluminum-containing hot extrusion die steel is as follows:

[0082] C: 0.60%, Si: 0.18%, Mn: 0.20%, Cr: 4.50%, Mo: 0.80%, V: 0.60%, Al: 0.90%, P: 0.015%, S: 0.010%, Fe balance.

[0083] In this example, the process steps of preparation, heat treatment and surface treatment of economical aluminum-containing hot extrusion die steel are as follows:

[0084] 1. Electric furnace smelting: smelting in an electric arc furnace according to the above-mentioned ratio of alloying elements, the melting temperature is greater than 1500°C, casting into Ф400mm electrode rods and air cooling;

[0085] 2. Electroslag remelting: Place the poured steel ingot as a consumable electrode in the electroslag remelting device for electroslag remelting. The slag melting voltage is 55-65V, the current is 3500-5500A, and the electric system is: voltage 55~60V, current 11500~12500A, capping voltage 58~62V, current time 48min, electroslag remel...

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Abstract

The invention relates to aluminum-containing hot extrusion mold steel and a production method thereof. According to the hot extrusion mold steel, the content of C is increased on the basis of H13 steel, the contents of Si, Cr and Mo are decreased, the total content of the alloy is about 2.5-3.5% less than that of H13, and the hot extrusion mold steel comprises the following main alloying elementsin percentage by mass: 0.45-0.60% of C, less than or equal to 0.30% of Si, less than or equal to 0.30% of Mn, 3.00-4.50% of Cr, 0.30-0.80% of Mo, 0.30-0.60% of V, 0.50-0.90% of Al, less than 0.015% ofP, less than 0.015% of S and the balance of Fe. High tempering resistance is obtained by balancing the Cr and Mo, and Al is added into the matrix so as to form an AlN highly wear-resistant strengthening phase by virtue of surface nitriding treatment. The preparation method of the steel in the invention comprises the following steps: compounding, smelting, casting, performing electro-slag remelting and annealing; performing high-temperature homogenized heat treatment, multi-directional forging and annealing; performing superfine heat treatment and isothermal annealing treatment; finally performing quenching and tempering treatment. The hot extrusion mold steel disclosed by the invention has the advantages of high wear resistance, excellent tempering resistance and the like under the conditions that the steel cost is low and toughness is equivalent to that of the H13 steel.

Description

technical field [0001] The invention belongs to the technical field of alloy steel manufacturing technology, and in particular relates to an economical aluminum-containing hot extrusion die steel and its preparation, heat treatment and surface treatment methods. Background technique [0002] Hot extrusion dies are used under severe conditions such as high temperature, high pressure, wear and thermal fatigue. Hot extrusion is a process in which a plastic metal blank passes through an extrusion die cavity under pressure to form a profile or pipe of the required shape. my country's current hot extrusion die steel uses 3Cr2W8V and H13 (4Cr5MoSiV1) steel in the national standard GB / T 1299-2000. [0003] The traditional hot extrusion die steel is 3Cr2W8V, which began to be used in industry in the 1920s. It is widely used in ferrous and non-ferrous metal hot extrusion dies. It is a hot work die steel with high thermal strength and has good forging properties. And machinability, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/24C22C38/06C22C38/04C22C38/02C22B9/18C21D8/00C21D1/26C21D1/18C23C8/26
CPCC21D1/18C21D1/26C21D8/005C22B9/18C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C23C8/26Y02P10/25
Inventor 施良才吴晓春姚杰杨浩鹏陈王海
Owner NINGBO HELI TECH CO LTD
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