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Cold extruding die steel and heat treatment technique thereof

A new type of mold and mold steel technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as high production costs and alloys that cannot meet requirements, achieve long service life, improve hardenability and comprehensive mechanical properties , the effect of reducing production costs

Inactive Publication Date: 2006-08-30
周向儒
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alloy steel contains a relatively high content of V, so the production cost is also high
At the same time, when high and uniform mechanical properties are required for workpieces with large cross-sections, this alloy cannot meet the requirements

Method used

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  • Cold extruding die steel and heat treatment technique thereof
  • Cold extruding die steel and heat treatment technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A new type of cold extrusion die steel, the die steel includes: carbon C0.8%, chromium Cr7.8%, molybdenum Mo1.5%, vanadium V0.5%, nickel Ni0.6%, tungsten W0 .6%, silicon Si0.2%, manganese Mn0.2%, niobium 0.3%, titanium 0.3%, rare earth elements 0.05%, sulfur S≤0.015%, phosphorus P≤0.02%, and the balance is iron Fe.

[0039] The heat treatment process of the above-mentioned novel cold extruded die steel can be carried out in the following steps:

[0040] (1), the first preheating, the temperature is 600 ℃, and the preheating time is 45 minutes;

[0041] (2), the second preheating, the temperature is 850 ℃, and the preheating time is 45 minutes;

[0042] (3) Quenching heating, the quenching heating temperature is 1010-1050°C, the quenching time is: 25+material thickness / 2 (minutes), and then the oil is cooled to 200-250°C for hot cleaning;

[0043] (4) For the first tempering, the tempering temperature is 200°C, the tempering time is 2 hours, and then air-cooled to room t...

Embodiment 2

[0047] A new type of cold extrusion die steel, the die steel includes: carbon C0.75%, chromium Cr7.3%, molybdenum Mo1.2%, vanadium V0.3%, nickel Ni0.3%, tungsten W0 .4%, silicon Si0.1%, manganese Mn0.1%, niobium 0.3%, titanium 0.3%, rare earth elements 0.05%, sulfur S≤0.015%, phosphorus P≤0.02%, and the rest is iron Fe.

[0048] The heat treatment process of the above-mentioned novel cold extruded die steel can be carried out in the following steps:

[0049] (1), the first preheating, the temperature is 600 ℃, and the preheating time is 45 minutes;

[0050] (2), the second preheating, the temperature is 850 ℃, and the preheating time is 45 minutes;

[0051] (3) Quenching heating, the quenching heating temperature is 1010-1050°C, the quenching time is: 25+material thickness / 2 (minutes), then cool in a salt bath, keep the temperature in stages when the temperature drops to 500°C, and then cool down to 200-200°C 250℃ hot cleaning;

[0052] (4) For the first tempering, the temp...

Embodiment 3

[0056] A new type of cold extrusion die steel, the die steel includes: carbon C0.85%, chromium Cr8.3%, molybdenum Mo2.0%, vanadium V0.9%, nickel Ni0.9%, tungsten W1 .1%, silicon Si0.4%, manganese Mn0.4%, niobium 0.3%, titanium 0.3%, rare earth elements 0.05%, sulfur S≤0.015%, phosphorus P≤0.02%, and the rest is iron Fe.

[0057] The heat treatment process of the above-mentioned novel cold extruded die steel can be carried out in the following steps:

[0058] (1), the first preheating, the temperature is 600 ℃, and the preheating time is 45 minutes;

[0059] (2), the second preheating, the temperature is 850 ℃, and the preheating time is 45 minutes;

[0060] (3) Quenching heating, the quenching heating temperature is 1010-1050°C, the quenching time is: 25+material thickness / 2 (minutes), and then air-cooled;

[0061] (4) For the first tempering, the tempering temperature is 200°C, the tempering time is 2 hours, and then air-cooled to room temperature;

[0062] (5), tempering ...

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Abstract

This invention relates to a new style alloy tool steel, especially relates to a new style cold extrusion die steal and its heat treatment technique. The weight percentage of the elements is that carbon 0.75-10.5%, chrome 7.3-8.5%, molybdenum 1.2-2.0%, vanadium 0.3-0.9%, nickel 0.3-0.9%, tungsten 1.2-2.0%, silicon 0.1-1.0%, manganese 0.1-0.4%, sulfur not more than 0.015%, phosphor not more than 0.02%, the rest is iron. Compared to home made die steel, the carbon and silicon content is reduced, and the molybdenum content is also reduced, the toughness and wear resistance of the alloy steel in this invention is increased, and the hardenability and synthetic mechanicalness is greatly improved, especially the low temperature impact toughness is great high. It can make fine die, and its using life is long, and the cost is reduced. This product in this invention is the most ideal material used for more than 300 tons cold extrusion die, and it can be widely used as cold extrusion die for stainless steel furnace butt and automobile door. This invention also provides the heat treating technique of the die steel.

Description

technical field [0001] The invention relates to a novel alloy tool steel, in particular to a novel cold extrusion die steel and its heat treatment process. Background technique [0002] Compression molding has become the main processing method in the manufacturing industry, especially in household appliances and daily necessities. The working conditions and performance requirements of the mold vary widely, so different steels are selected for different service conditions. The performance-price ratio of steel for molds is a parameter to measure its economic benefits. In addition to requiring similar compression resistance (ie hardness) to other cold-working molds, cold extrusion molds also require the highest possible strength and toughness. For molds that process high-strength materials and require high life (as large as possible the number of stampings), a certain fatigue resistance is also required. [0003] In the past, the die steel materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C22C38/48C22C38/50C21D11/00C21D1/18C23G5/00C21D1/607
Inventor 周向儒赵春华廖德秀宋利秋
Owner 周向儒
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