Free-cutting lead-free anticorrosive brass alloy with low boron and bismuth

A brass alloy, easy-cutting technology, applied in the fields of valve parts, civil water supply system pipe castings, electronic and telecommunications connectors, switch connectors, lead-free low-boron bismuth brass alloys, can solve the problem of high market prices, and achieve Excellent dezincification resistance, good welding performance, and excellent corrosion resistance

Active Publication Date: 2009-02-25
NINGBO POWERWAY ALLOY MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its cutting performance is only 75-85%, and the market price is higher

Method used

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  • Free-cutting lead-free anticorrosive brass alloy with low boron and bismuth
  • Free-cutting lead-free anticorrosive brass alloy with low boron and bismuth
  • Free-cutting lead-free anticorrosive brass alloy with low boron and bismuth

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Embodiment Construction

[0021] Below in conjunction with specific embodiment the invention is described in further detail:

[0022] The production technological process of brass alloy in the embodiment of the present invention is as follows:

[0023] Raw material preparation and batching—alloying smelting—continuous ingot casting—ingot heating—extrusion—stretching—heat treatment—pickling—stretching—straightening and polishing—stress relief annealing— - Inspection of finished product packaging.

[0024] Specifically, it can be expressed as follows: low-boron bismuth brass alloy is smelted by alloying treatment and covering protection method, so that metal bismuth and boron are rapidly solid-solved into intermetallic compounds in brass melt, and continuously cast into brass at 1020 °C Ingot casting, high extrusion ratio extrusion at 680-770°C, intermediate heat treatment annealing at 430-700°C according to cold working conditions, and stress-relief annealing at a temperature lower than 400°C.

[0025...

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Abstract

The present invention discloses one kind of free-cutting anticorrosive brass alloy and its preparation process. Chemically, the brass alloy consists of Cu 57-64 wt%, Bi 0.6-2.5 wt%, B 0.0003-0.025 wt%, Mn 0.01-0.2 wt%, Sb 0.002-0.02 wt% and Zn and inevitable impurities for the rest. The inevitable impurities has content within 0.3 wt%, and includes Pb within 0.1 wt% and Cd within 0.001 wt%; and the alloy contains Cu+Zn over 97 wt%. The brass alloy has high anticorrosive performance, excellent cutting performance and good welding performance.

Description

technical field [0001] The invention relates to a lead-free brass alloy, in particular to a lead-free low-boron-bismuth brass alloy which is easier to cut and has excellent resistance to dezincification corrosion. It is especially suitable for electronic and telecommunications connectors, civil water supply system pipe castings, valves, switch connectors; household appliances; optoelectronic components for lamps and photographic equipment; children's toys and parts manufacturing in machinery and automobile manufacturing industries. It is a metal material that is beneficial to human health and environmentally friendly, and it is also a substitute for lead brass, which is widely used at present and can cause adverse effects on the human body and the environment. Background technique [0002] Leaded brass has excellent cold and hot processing performance, excellent cutting performance and self-lubricating characteristics, which can meet the machining of various shapes of parts,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/04
Inventor 张明蔡洎华谢潇裴勇军
Owner NINGBO POWERWAY ALLOY MATERIAL
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