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Hot-work die steel for extrusion wheel and manufacturing method thereof

A technology of hot-working die steel and manufacturing method, which is applied in the direction of metal processing equipment, etc., can solve the problem of high production cost, and achieve the effect of low raw material cost, fine grain, and low cost

Inactive Publication Date: 2012-07-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the patented technology of "nitrogen-containing austenitic hot work die steel and its preparation method" (CN101942606A) has high thermal stability, high strength and high toughness, but its production cost is high (containing Mn 10.0-15.0 wt%, Mo 1.5-3.5 wt%), mainly used for working under high temperature conditions

Method used

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  • Hot-work die steel for extrusion wheel and manufacturing method thereof
  • Hot-work die steel for extrusion wheel and manufacturing method thereof
  • Hot-work die steel for extrusion wheel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A hot work die steel for extrusion wheels and a manufacturing method thereof. In the method, scrap steel is smelted in an electric furnace, hot forged and heat treated after electroslag remelting, and hot working die steel for extrusion wheels is obtained.

[0026] The chemical composition and mass percentage of the hot working die steel for the extrusion wheel are: C is 0.30-0.41wt%, Si is 0.80-1.05wt%, Mn is 0.4-0.5wt%, and Cr is 3.0-4.0wt% %, Mo is 1.20-1.40wt%, V is 0.70-0.95wt%, N is 0.005-0.010wt%, P<0.028wt%, S<0.010wt%, and the balance is Fe and unavoidable impurities.

[0027] The hot forging process in Example 1 is: heating the steel ingot after electroslag remelting to 1150-1200°C, soaking for 1.5-2.0h, initial forging temperature 1100-1150°C, final forging temperature > 920°C, forging ratio ≥ 5. Naturally cool to room temperature.

[0028] The technology of present embodiment 1 heat treatment is:

[0029] (1) Forging blank spheroidizing annealing: Heating...

Embodiment 2

[0037]A hot work die steel for extrusion wheels and a manufacturing method thereof. The method is to smelt molten iron and scrap steel in an electric furnace, and then carry out hot forging and heat treatment after electroslag remelting to obtain hot working die steel for extrusion wheels.

[0038] The chemical composition and mass percentage of the hot working die steel for extrusion wheel are: C is 0.40-0.45wt%, Si is 1.0-1.10wt%, Mn is 0.30-0.40wt%, Cr is 3.50-4.50wt% %, Mo is 1.30-1.50wt%, V is 0.90-1.10wt%, N is 0.010-0.020wt%, P<0.025wt%, S<0.021wt%, and the balance is Fe and unavoidable impurities.

[0039] The hot forging process of Example 2 is: heating the steel ingot after electroslag remelting to 1180-1220°C, soaking for 2.0-2.5h, initial forging temperature 1100-1150°C, final forging temperature>910°C, forging ratio≥ 5. Naturally cool to room temperature.

[0040] The technology of present embodiment 2 heat treatment is:

[0041] (1) Forging blank spheroidizing...

Embodiment 3

[0049] A hot work die steel for extrusion wheels and a manufacturing method thereof. In the method, scrap steel is smelted in an electric furnace, and after vacuum induction smelting, hot forging and heat treatment are carried out to obtain hot working die steel for extrusion wheels.

[0050] The chemical composition and mass percentage of the hot working die steel for extrusion wheels are: C is 0.43-0.50wt%, Si is 1.10-1.20wt%, Mn is 0.2-0.3wt%, and Cr is 4.00-5.00wt% %, Mo is 1.00-1.20wt%, V is 1.00-1.20wt%, N is 0.020-0.030wt%, P<0.029wt%, S<0.028wt%, and the balance is Fe and unavoidable impurities.

[0051] The hot forging process of Example 3 is: heating the steel ingot after vacuum induction melting to 1200-1250°C, soaking for 2.0-2.5h, initial forging temperature 1100-1150°C, final forging temperature > 915°C, forging ratio ≥ 5 , naturally cooled to room temperature.

[0052] The technology of present embodiment 3 heat treatment is:

[0053] (1) Forging blank sphero...

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Abstract

The invention relates to hot-work die steel for an extrusion wheel and a manufacturing method of the die steel. The invention adopts the technical scheme that the manufacturing method comprises the following steps: hot-forging after scrap steel or molten iron and scrap steel are smelted in an electric furnace and are subjected to electroslag remelting or vacuum induction melting and then carry out spheroidizing annealing at a temperature of 700-880 DEG C; quenching at a temperature of 1,020-1,120 DEG C and tempering at a temperature of 530-650 DEG C, wherein the hot-work die steel has a hardness of up to 40-52HRC and a tensile strength of up to 1,850-1,955MPa. The hot-work die steel comprises the following chemical components in percentage by weight: 0.30-0.50wt% of C, 0.80-1.20wt% of Si, 0.2-0.5wt% of Mn, 3.00-5.00wt% of Cr, 1.00-1.50wt% of Mo, 0.70-1.20wt% of V, 0.005-0.03wt% of N and less than 0.030wt% of P, less than 0.030wt% of S and the balances of Fe and inevitable impurities. The steel has the characteristics of low cost, good thermal fatigue property, high heat stability and excellent comprehensive property and can be used for manufacturing the extrusion wheel of a continuously-extrusion-molded coating machine and other hot-work dies.

Description

Technical field [0001] The present invention is the field of heat -making mold steel technology, involving a continuous squeezing molding wheel for molding mold steel and its manufacturing method. Background technique [0002] Heat -made molds bear a lot of pressure and impact load in work, and the impact frequency is very high. Mold and high -temperature metal contact must also be heated and cooled. The surface generates heat fatigue cracks (Zhu Zongyuan. my country's heat-making mold steel performance dataset (continued) [J]. Mechanical engineering materials, 2001,25 (8): 38-42.).The squeezing wheel is one of the main working components of continuous squeezing molding machine, and its working life directly affects continuous squeezing production costs and production efficiency.In the process of service, due to the working conditions of cold and hot, and the strong squeezing and friction with the processing materials, it is easy to cause premature failure of the extrusion wheel....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C21D1/18C21D1/32C21D8/00B21J5/00
Inventor 刘宏玉汪圣锋
Owner WUHAN UNIV OF SCI & TECH
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