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Stress cracking resisting lead brass bar and preparing method thereof

A stress-cracking-resistant, lead-brass technology, applied in the field of copper alloys, can solve problems such as cracking, freon leakage, and poor sealing, and achieve the effects of making up for losses, reducing stress concentration, and improving strength

Active Publication Date: 2020-06-19
JINTIAN COPPER GROUP CORP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the cut-off valve of the air conditioner is welded to the copper tube of the air conditioner, the stop valve cracks due to the influence of the stress concentration of the material, resulting in poor sealing and leakage of Freon
[0004] Therefore, in view of the structural problems existing in the existing lead brass HPb59-1 air conditioner globe valve, it is necessary to redesign the alloy composition, so as to solve the problem of cracking after welding

Method used

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  • Stress cracking resisting lead brass bar and preparing method thereof
  • Stress cracking resisting lead brass bar and preparing method thereof

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] Choose 20 embodiments and prepare according to the method of the present invention, concrete technical process is:

[0036] 1) Batching: according to the required alloy elements and proportions;

[0037] 2) Smelting: The melting temperature is 1000-1080°C, and keep warm after all the metals are melted;

[0038] 3) Casting: copper water is continuously drawn horizontally from the holding furnace by the crystallizer;

[0039] 4) Ingot heating: the heating temperature is 550-650°C; compared with the traditional process, the mechanism of controlling this temperature range

[0040] 5) Extrusion: The extrusion force is 5-40MN, and the excess thickness is controlled at 5-20mm;

[0041] 6) Stretching: Stretch the extruded billet on a drawing machine after pickling;

[0042] 7) Stress-relief annealing: Stress-relief annealing is performed on...

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Abstract

The invention discloses a stress cracking resisting lead brass bar. The stress cracking resisting lead brass bar is characterized by comprising, by mass percent, 58.0-60.0 wt% of Cu, 0.8-1.9 wt% of Pb, 0.10-0.20 wt% of Fe, 0.5-2.0 wt% of Ni, 0.003-0.02 wt% of P and the balance Zn and inevitable impurities. Fe and Ni are added on the basis of traditional lead brass, the proportion of the alpha phase in a base body is increased, the alpha phase and the beta phase exist in an isometric crystal manner, a structure in a material is more uniform, stress concentration is reduced, and the cracking risk after welding is reduced.

Description

technical field [0001] The invention relates to a copper alloy, in particular to a lead brass bar material with resistance to stress cracking and a preparation method thereof. Background technique [0002] The air conditioner cut-off valve is a valve that controls the gas exchange in the air conditioner, and if the air conditioner stop valve is welded to the copper tube of the air conditioner, if the seal is not good, it will cause Freon leakage and affect the cold and heat exchange function of the air conditioner. The air conditioner globe valve is usually processed by hexagonal lead brass rods. Through the analysis of the failed lead brass defects, it is found that the cracks are caused by the stress concentration of the material, and the stress concentration point is often a certain defect inside the material structure. By comparing the metallographic structure of the cracked valve body with the uncracked metallographic structure, it is found that there are obvious differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22C1/02C22F1/08
CPCC22C1/02C22C9/04C22F1/08
Inventor 叶东皇巢国辉郑恩奇傅杰
Owner JINTIAN COPPER GROUP CORP NINGBO