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Low-temperature salt bath nitriding process for aluminum alloy hot-extrusion die steel

A technology of hot extrusion dies and aluminum alloy profiles, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., to achieve the effect of improving hardness

Inactive Publication Date: 2013-04-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, it is rarely used in the low-temperature salt bath nitriding process of die steel workpieces

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0012] The process scheme of the present invention will be specifically described below through examples.

[0013] Put the aluminum alloy hot extrusion mold in the common pickling and alkali cleaning medium, and wash it by hanging for 15 minutes many times to remove the oil on the surface of the workpiece, and then wash the workpiece with clean water; dry the workpiece in a dryer, After drying, put it in the furnace at about 300~350°C for preheating for 20 minutes; then add the nitride salt for nitriding into the crucible in the nitriding furnace, which is characterized in that the nitride salt for salt bath nitriding is composed of The composition is as follows: KCNO 25%, NaCNO 25%, K 2 CO 3 10%, Na 2 CO 3 10%, Li 2 CO 3 7%, La 2 (CO 3 ) 3 0.5%, Ce 2 (CO 3 ) 3 0.5%, NaCl 11.5%, KCl 10.5%, NaCl 2 SO 4 0.5%. Na 2 S 0.025%, K 2 S 0.025%. Heat the nitride salt in the nitriding furnace until it melts and puts the molten liquid, then put the preheated aluminu...

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Abstract

The invention relates to a low-temperature salt bath nitriding process for aluminum alloy hot-extrusion die steel. The low-temperature salt bath nitriding process for the aluminum alloy hot-extrusion die steel is characterized in that: nitriding salt for salt bath nitridation comprises the following components in weight percentage: 10-55% of KCNO, 5-55% of NaCNO, 5-15% of K2CO3, 5-15% of Na2CO3, 1-15% of Li2CO3, 0.1-5% of La2(CO3)3, 0.1-5% of Ce2(CO3)3, 3-20% of NaCl, 3-20% of KCl, 0.1-1% of Na2SO4, 0.01-0.5% of Na2S and 0.01-0.5% of K2S. The low-temperature salt bath nitriding process for a die steel workpiece is characterized by comprising the following process flows: (1) cleaning; (2) drying and preheating; (3) nitriding; (4) cooling; (5) cleaning and drying; and (6) polishing. The low-temperature salt bath nitriding process for the aluminum alloy hot-extrusion die steel has the advantage as follows: the hardness, the wear resistance and the fatigue strength of the surface of the die steel are effectively improved.

Description

technical field [0001] The invention relates to a low-temperature salt-bath nitriding process for aluminum alloy profile hot extrusion die steel. Background technique [0002] Salt bath nitriding process technology is also called soft nitriding treatment technology. The active nitrogen atoms generated by the decomposition of cyanate penetrate into the workpiece and form a dense nitriding layer on the surface of the workpiece, thereby improving the durability of the extrusion die. Abrasiveness, corrosion resistance and fatigue resistance, so salt bath nitriding has been widely used in production practice. However, the low-temperature nitriding process of die steel workpieces at home and abroad mainly uses the ion nitriding process and a small amount of gas nitriding process. At present, it is rarely used in the low-temperature salt bath nitriding process of die steel workpieces. Contents of the invention [0003] The purpose of the invention is to provide a nitriding proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/50
Inventor 王均熊计李明星
Owner SICHUAN UNIV
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