Unlock instant, AI-driven research and patent intelligence for your innovation.

Lead-free and easy-cutting magnesium-bismuth-brass alloys

A magnesium-bismuth brass, free-cutting technology, applied in the field of lead-free brass alloys, can solve the problems affecting the subsequent processing performance of the alloy, poor thermal processing performance of the alloy, and lack of market competitiveness, and achieves good thermal processing performance, good Welding performance, fine grain effect

Active Publication Date: 2011-06-15
SHANGHAI WUXING COPPER CO LTD
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above alloy is a copper-zinc-antimony alloy. Since the alloy contains antimony, the hot workability of the alloy is relatively poor, which greatly affects the subsequent processing performance of the alloy.
An invention patent "Lead-Free Free-cutting Brass Alloy Material and Its Manufacturing Method" disclosed in the specification of Chinese Patent Application No. 02121991.5 is a lead-free free-cutting brass material invented by Mitsukoshi Metal Co., Ltd. of Japan. It is a kind of Copper-zinc-bismuth alloy, because the alloy contains 0.5-2.2% bismuth, the bismuth content is relatively high, and the price of bismuth is very high, so its cost increases and it has no market competitiveness

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the composition of the alloy described in Table 1, copper and zinc are first smelted during smelting at a temperature of 1150°C to 1250°C, then bismuth is added, after standing for 10 minutes, magnesium is added, and after 20 to 40 minutes of heat preservation Casting is carried out at a casting temperature of 1050°C to 1100°C to form a lead-free magnesium-bismuth brass alloy ingot, which is then extruded at a temperature of 580°C to form a round rod ingot with a size of Φ200×600mm. Heat treatment at 600°C for 30 minutes, cooling at a cooling rate of ≤100°C / hour, and finish annealing at a temperature lower than 400°C to make a wire rod of Φ10mm, and obtain product 1.

[0024] The comparative samples are C36000 alloy, which is recognized as the best machinability in the world, and domestic bismuth brass and antimony brass.

[0025] Table 1 The alloy composition example (weight %) of lead-free free-cutting magnesium-bismuth brass of the present invention

[...

Embodiment 2

[0028] The lead-free magnesium-bismuth brass alloy composed of the alloy composition described in Table 2 is extruded at a temperature of 700° C., and extruded into a round rod ingot with a size of Φ200×600 mm. Heat treatment at 400°C for 6 hours, cooling at a cooling rate of ≤100°C / hour, and finish annealing at a temperature lower than 400°C to make a wire rod of Φ10mm, and obtain product 2.

[0029] Table 2 The alloy composition example (weight %) of lead-free free-cutting magnesium-bismuth brass of the present invention

[0030]

Embodiment 3

[0032] The lead-free magnesium-bismuth brass alloy composed of the alloy composition described in Table 3 was extruded at a temperature of 640° C., and extruded into a round rod ingot with a size of Φ200×600 mm. Heat treatment at 500°C for 3 hours, cooling at a cooling rate of ≤100°C / hour, and finish annealing at a temperature lower than 400°C to make a wire rod of Φ10mm, and obtain product 3.

[0033] Table 3 Example of alloy composition composition (weight %) of lead-free free-cutting magnesium-bismuth brass of the present invention

[0034]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a lead-free easily cutting magnesium, bismuth and brass alloy. The alloy comprises the following components in percentage by weight: 50 to 62 percent of brass, 0.5 to 3.0 percent of magnesium, 0.1 to 1.0 percent of bismuth, the balance being zinc and inevitable impurities. The manufacturing method of the alloy is as follows: alloy components are extruded at the temperature of between 580 and 700 DEG C, heat treated at the temperature of between 400 and 600 DEG C for 30min to 6hr, cooled at the cooling speed of less than or equal to 100 DEG C / hr and undergo the finished product annealing at the temperature of less than 400 DEG C. The lead-free easily cutting magnesium, bismuth and brass alloy has the advantages of excellent cutting performance and heat processing performance.

Description

technical field [0001] The invention relates to a lead-free brass alloy, in particular to a magnesium-bismuth brass alloy with excellent cutting performance and thermal processing performance, which is especially suitable for various mechanical parts and electronic devices used in place of lead brass, It is an environmentally friendly green metal material that can effectively replace leaded brass in the application fields such as auto parts. Background technique [0002] Traditional lead brass has been used for more than 1,000 years and is widely used in daily hardware appliances, such as: faucets, door locks, door handles, water pipes, screws, nuts, pipe joints, etc., in electronics, In household appliances and machinery equipment, it is an indispensable material. The main purpose of adding lead to copper is to produce the easy cutting, cold riveting and forging processing properties of its alloy, so as to meet the needs of various machine parts manufacturing and processin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/02B22D21/00C22F1/08
Inventor 黄国杰谢水生米绪军李雷程磊
Owner SHANGHAI WUXING COPPER CO LTD