阅读说明：本技术 一种高强力黄铜的制备方法 (Preparation method of high-strength brass ) 是由 陈风岗 胡志强 于 2021-07-05 设计创作，主要内容包括：本发明公开了一种高强力黄铜的制备方法,所述的黄制备方法包括a)铜铁中间合金的制备方法；b、重熔工序。本发明与现有技术相比,所生产的黄铜的技术指标如下：拉力≧490MPa、延伸率≧25％、布氏硬度HB：≧175,能够满足杠杆摇臂、阀门杆、轴套、齿轮、衬套、古河焊钳料的需要。(The invention discloses a preparation method of high-strength brass, which comprises a) a preparation method of a copper-iron intermediate alloy; b. and a remelting process. Compared with the prior art, the technical indexes of the produced brass are as follows: tensile force is not less than 490MPa, elongation is not less than 25%, Brinell hardness HB: not less than 175, can satisfy the needs of lever rocking arm, valve rod, axle sleeve, gear, bush, ancient river soldering turret material.)

1. A preparation method of high-strength brass comprises the following steps:

a) the preparation method of the copper-iron intermediate alloy comprises the following steps:

a1, preparation: preparing industrial pure iron, red copper, phosphorus copper, industrial salt and charcoal,

a2, primary melting process: firstly, adding 2/3 red copper in total amount, melting, and then heating to above 1230 ℃ to form copper liquid;

a3, and a charging process: adding industrial pure iron preheated to 200 ℃ into the copper liquid for 2-3 times, and covering charcoal on the surface of the copper liquid after adding; completely melting the industrial pure iron, and adding the rest red copper material; after adding, scattering industrial salt particles on the surface of the charcoal, standing for 7-10 minutes, stirring and deslagging;

a4 and a deoxidation step: after deslagging, heating to 1200-1250 ℃, adding phosphor copper, stirring for 7-10 minutes, and deoxidizing;

a5, tapping and pouring: pouring the deoxidized molten liquid into a sand mold or an iron ingot mold which is brushed with a coating and preheated;

b. remelting step:

b1, batching: preparing red copper, copper-iron intermediate alloy, phosphorus copper, charcoal and industrial salt;

b2, smelting: firstly, red copper and copper-iron intermediate alloy with the total amount of 10-15% are added, the bottom is paved and power is supplied for 6-10 minutes, 40-50% of copper-iron intermediate alloy is added after metal liquid is seen for melting, charcoal with the total amount of 70% is added after 200-250 cm of metal liquid is added below, the rest of steel intermediate alloy is added, the mixture is fully stirred for 6-8 minutes after being melted and cleaned, the temperature is raised to 1250-1280 ℃, power is cut off for standing, industrial salt is added, and the furnace cover is covered and the standing is continued for 6-10 minutes. Then fully stirring for 1-2 minutes, standing for 2-5 minutes, removing all charcoal and scum to expose clean metal liquid level, then adding the rest charcoal powder to cover the liquid level, transmitting electricity, heating to 1180-1190 ℃, discharging and pouring;

b3 casting procedure;

the pouring process of B3 should be completed within 30 minutes. And during pouring, the height of the liquid level is controlled to be not higher than the upper surface of the cavity, point pouring is not needed, the pouring sequence of each spindle is recorded, and a sequence character head is marked after cooling.

2. The method for preparing high-strength brass as claimed in claim 1, wherein: a1, preparing industrial pure iron, red copper, phosphorus copper, industrial salt and charcoal in the material preparation process, wherein the weight ratio of the red copper to the phosphorus copper to the industrial salt to the charcoal is 15: 85: 0.05-0.1: 0.005-0.01: 0.1-0.5.

3. The method for preparing high-strength brass as claimed in claim 1, wherein: in the A3 feeding process, the temperature is always increased in the process of adding iron to the molten copper, so that the iron is rapidly melted.

4. The method for preparing high-strength brass as claimed in claim 1, wherein: in the A4 deoxidation step, the content of phosphorus in the phosphorus-copper alloy is 14%.

5. The method for preparing high-strength brass as claimed in claim 1, wherein: in the step B1 and the batching procedure, the weight ratio of red copper, copper-iron intermediate alloy, charcoal and industrial salt is 5: 228: 1-2: 0.5-1.

Technical Field

The invention belongs to a preparation method of brass, and particularly belongs to the technical field of preparation methods of high-strength brass.

Background

The technical indexes of common brass in the current market are as follows: the tensile force is not less than 295MPa, the elongation is not less than 30%, and the Brinell hardness is HB: not less than 60, can not satisfy the needs of the casting that requires high strength and toughness, such as lever rocker arm, valve rod, axle sleeve, gear, bush, gulhe river soldering turret material.

Disclosure of Invention

The invention aims to provide a preparation method of high-strength brass with tensile force not less than 490.

The technical scheme for solving the technical problem of the invention is as follows: a preparation method of high-strength brass comprises the following steps:

a) the preparation method of the copper-iron intermediate alloy comprises the following steps:

a1, preparation: preparing industrial pure iron, red copper, phosphorus copper, industrial salt and charcoal, wherein the weight ratio of the industrial pure iron to the red copper to the phosphorus copper to the industrial salt to the charcoal is 15: 85: 0.05-0.1: 0.005-0.01: 0.1-0.5;

a2, primary melting process: firstly, adding 2/3 red copper in total amount, melting, and then heating to above 1230 ℃ to form copper liquid;

a3, and a charging process: adding industrial pure iron preheated to 200 ℃ into the copper liquid for 2-3 times, and covering charcoal on the surface of the copper liquid after adding; completely melting the industrial pure iron, and adding the rest red copper material; after adding, scattering industrial salt particles on the surface of the charcoal, standing for 7-10 minutes, stirring and deslagging;

a4 and a deoxidation step: after deslagging, heating to 1200-1250 ℃, adding phosphor copper, stirring for 7-10 minutes, and deoxidizing;

a5, tapping and pouring: pouring the deoxidized molten liquid into a sand mold or an iron ingot mold which is brushed with a coating and preheated;

in the A3 feeding procedure, the temperature is always increased in the process of adding iron into the copper liquid to promote the iron to be rapidly melted;

in the A4 deoxidation procedure, the content of phosphorus in the phosphorus copper is 14 percent;

b. remelting step:

b1, batching: preparing red copper, copper-iron intermediate alloy, phosphorus copper, charcoal and salt; the weight ratio of red copper, copper-iron intermediate alloy, charcoal and industrial salt is 5: 228: 1-2: 0.5 to 1;

b2, smelting: firstly, red copper and copper-iron intermediate alloy with the total amount of 10-15% are added, the bottom is paved and power is supplied for 6-10 minutes, 40-50% of copper-iron intermediate alloy is added after metal liquid is seen for melting, charcoal with the total amount of 70% is added after 200-250 cm of metal liquid is added below, the rest of steel intermediate alloy is added, the mixture is fully stirred for 6-8 minutes after being melted and cleaned, the temperature is raised to 1250-1280 ℃, power is cut off for standing, industrial salt is added, and the furnace cover is covered and the standing is continued for 6-10 minutes. Then fully stirring for 1-2 minutes, standing for 2-5 minutes, removing all charcoal and scum to expose clean metal liquid level, then adding the rest charcoal powder to cover the liquid level, transmitting electricity, heating to 1180-1190 ℃, discharging and pouring;

b3 casting procedure;

the pouring process of B3 should be completed within 30 minutes. During pouring, the height of the liquid level is controlled and is not higher than the upper surface of the cavity. And (4) recording the pouring sequence of each spindle without point pouring. And after cooling, printing a sequence header.

The Zn element in the invention has the advantages of improving the strength and the hardness, preventing the copper liquid from breathing, improving the fluidity and having stronger deoxidation effect.

Fe has the functions of refining crystal grains, improving mechanical properties and improving the corrosion resistance of castings.

Compared with the prior art, the technical indexes of the produced brass are as follows: tensile force is not less than 490MPa, elongation is not less than 25%, Brinell hardness HB: not less than 175, can satisfy the needs of lever rocking arm, valve rod, axle sleeve, gear, bush, ancient river soldering turret material.

Detailed Description

The present invention will be described in detail with reference to examples.

Example 1:

the preparation method comprises the following steps:

a) the preparation method of the copper-iron intermediate alloy comprises the following steps:

a1, preparation: preparing industrial pure iron, red copper, phosphorus copper, industrial salt and charcoal, wherein the weight ratio of the industrial pure iron to the red copper to the phosphorus copper to the industrial salt to the charcoal is 15: 85: 0.05: 0.005: 0.1;

a2, primary melting process: firstly, adding 2/3 red copper in total amount, melting, and then heating to above 1230 ℃ to form copper liquid;

a3, and a charging process: adding industrial pure iron preheated to 200 ℃ into the copper liquid for 2 times, and covering charcoal on the surface of the copper liquid after adding; completely melting the industrial pure iron, and adding the rest red copper material; after adding, scattering industrial salt particles on the surface of the charcoal, standing for 7 minutes, stirring and removing slag;

a4 and a deoxidation step: after deslagging, heating to 1200 ℃, adding phosphorus copper, stirring for 7 minutes, and deoxidizing;

a5, tapping and pouring: pouring the deoxidized molten liquid into a sand mold or an iron ingot mold which is brushed with a coating and preheated;

in the A3 feeding procedure, the temperature is always increased in the process of adding iron into the copper liquid to promote the iron to be rapidly melted;

in the A4 deoxidation procedure, the content of phosphorus in the phosphorus copper is 14 percent;

b. remelting step:

b1, batching: preparing red copper, copper-iron intermediate alloy, charcoal and salt; the weight ratio of red copper, copper-iron intermediate alloy, charcoal and industrial salt is 5: 228: 1: 0.5;

b2, smelting: firstly, red copper and copper-iron intermediate alloy with the total amount of 10 percent are added, the bottom is paved and the power is supplied for 6 minutes, 40 percent of the copper-iron intermediate alloy is added after molten metal is seen to be melted, charcoal with the total amount of 70 percent is added after the molten metal with the lower side of 200 cm is seen, the rest steel intermediate alloy is added, the mixture is fully stirred for 6 minutes after being dissolved, the temperature is increased to 1250 ℃, the power is cut off and the mixture is kept stand, industrial salt is added, and the furnace cover is covered and the stand is continued for 6 minutes. Fully stirring for 1 minute, standing for 2 minutes, removing all charcoal and scum to expose clean metal liquid level, adding the rest charcoal powder to cover the liquid level, transmitting power, heating to 1180-1190 ℃, discharging and pouring;

b3 casting procedure;

the pouring process of B3 should be completed within 30 minutes. During pouring, the height of the liquid level is controlled and is not higher than the upper surface of the cavity. And (4) recording the pouring sequence of each spindle without point pouring. And after cooling, printing a sequence header.

Example 2:

a preparation method of high-strength brass comprises the following steps:

a) the preparation method of the copper-iron intermediate alloy comprises the following steps:

a1, preparation: preparing industrial pure iron, red copper, phosphorus copper, industrial salt and charcoal, wherein the weight ratio of the industrial pure iron to the red copper to the phosphorus copper to the industrial salt to the charcoal is 15: 85: 0.07: 0.008: 0.3;

a2, primary melting process: firstly, adding 2/3 red copper in total amount, melting, and then heating to above 1230 ℃ to form copper liquid;

a3, and a charging process: adding industrial pure iron preheated to 200 ℃ into the copper liquid for 2 times, and covering charcoal on the surface of the copper liquid after adding; completely melting the industrial pure iron, and adding the rest red copper material; after adding, scattering industrial salt particles on the surface of the charcoal, standing for 8 minutes, stirring and removing slag;

a4 and a deoxidation step: after deslagging, heating to 1230 ℃, adding phosphorus copper, stirring for 9 minutes and deoxidizing;

a5, tapping and pouring: pouring the deoxidized molten liquid into a sand mold or an iron ingot mold which is brushed with a coating and preheated;

in the A3 feeding procedure, the temperature is always increased in the process of adding iron into the copper liquid to promote the iron to be rapidly melted;

in the A4 deoxidation procedure, the content of phosphorus in the phosphorus copper is 14 percent;

b. remelting step:

b1, batching: preparing red copper, copper-iron intermediate alloy, phosphorus copper, charcoal and salt; the weight ratio of red copper, copper-iron intermediate alloy, charcoal and industrial salt is 5: 228: 2: 0.7;

b2, smelting: firstly, red copper and copper-iron intermediate alloy with the total amount of 10-15% are added, the bottom is paved and the power is supplied for 8 minutes, 45% of the copper-iron intermediate alloy is added after molten metal is seen to melt, charcoal with the total amount of 70% is added after 230 cm of molten metal is seen below, the rest steel intermediate alloy is added, the mixture is fully stirred for 7 minutes after being cleaned, the temperature is increased to 1270 ℃, the power is cut off and the mixture is kept stand, industrial salt is added, the furnace cover is covered, and the mixture is kept stand for 8 minutes. Fully stirring for 2 minutes, standing for 4 minutes, removing all charcoal and scum to expose the clean metal liquid level, adding the rest charcoal powder to cover the liquid level, transmitting power, heating to 1180-1190 ℃, discharging and pouring;

b3 casting procedure;

the pouring process of B3 should be completed within 30 minutes. During pouring, the height of the liquid level is controlled and is not higher than the upper surface of the cavity. And (4) recording the pouring sequence of each spindle without point pouring. And after cooling, printing a sequence header.

Example 3

A preparation method of high-strength brass comprises the following steps:

a) the preparation method of the copper-iron intermediate alloy comprises the following steps:

a1, preparation: preparing industrial pure iron, red copper, phosphorus copper, industrial salt and charcoal, wherein the weight ratio of the industrial pure iron to the red copper to the phosphorus copper to the industrial salt to the charcoal is 15: 85: 0.1: 0.01: 0.5;

a2, primary melting process: firstly, adding 2/3 red copper in total amount, melting, and then heating to above 1230 ℃ to form copper liquid;

a3, and a charging process: adding industrial pure iron preheated to 200 ℃ into the copper liquid for 3 times, and covering charcoal on the surface of the copper liquid after adding; completely melting the industrial pure iron, and adding the rest red copper material; after adding, scattering industrial salt particles on the surface of the charcoal, standing for 10 minutes, stirring and removing slag;

a4 and a deoxidation step: after deslagging, heating to 1250 ℃, adding phosphorus and copper, and stirring for 10 minutes to deoxidize;

a5, tapping and pouring: pouring the deoxidized molten liquid into a sand mold or an iron ingot mold which is brushed with a coating and preheated;

in the A3 feeding procedure, the temperature is always increased in the process of adding iron into the copper liquid to promote the iron to be rapidly melted;

in the A4 deoxidation procedure, the content of phosphorus in the phosphorus copper is 14 percent;

b. remelting step:

b1, batching: preparing red copper, copper-iron intermediate alloy, phosphorus copper, charcoal and salt; the weight ratio of red copper, copper-iron intermediate alloy, charcoal and industrial salt is 5: 228: 2: 1;

b2, smelting: firstly, red copper and 15% of total amount of copper-iron intermediate alloy are added, the bottom is paved and power is supplied for 6-10 minutes, 50% of the copper-iron intermediate alloy is added after molten metal is seen to be molten, charcoal with the total amount of 70% is added after 250 cm of molten metal is seen below, the rest of steel intermediate alloy is added, the mixture is fully stirred for 8 minutes after being cleaned, the temperature is increased to 1280 ℃, power is cut off and the mixture is kept stand, industrial salt is added, the furnace cover is covered, and the mixture is kept stand for 10 minutes. Fully stirring for 2 minutes, standing for 5 minutes, removing all charcoal and scum to expose clean metal liquid level, adding the rest charcoal powder to cover the liquid level, transmitting power, heating to 1180-1190 ℃, discharging and pouring;

b3 casting procedure;

the pouring process of B3 should be completed within 30 minutes. During pouring, the height of the liquid level is controlled and is not higher than the upper surface of the cavity. And (4) recording the pouring sequence of each spindle without point pouring. And after cooling, printing a sequence header.

The technical specifications of the brass produced in examples 1, 2 and 3 are as follows: tensile force is not less than 490MPa, elongation is not less than 25%, Brinell hardness HB: ≧ 175.