Steel pin mould compression molding elevator counterweight block and preparation method thereof

[0017] Example one

[0018] The steel pin compression molding elevator counterweight of the present invention, the chemical composition of the counterweight is as follows in weight percentage, C: ≤0.15-0.25%, Si: 0.20-0.40%, Mn: 0.75-0.35%, P : ≤0.03-0.05%, S: ≤0.025-0.050%, Cr: 12.5-16.5%, N: 0.30-0.55%, Mo: 0.20-0.4%.

[0019] A method for preparing steel pin compression molding elevator counterweights of the present invention includes the following steps: Step 1) Melting the above-mentioned raw materials according to the ratio, charging the raw materials into a melting furnace through an automatic feeding machine, and then controlling the temperature of the melting furnace At 1780 degrees Celsius to 1850 degrees Celsius, the melting time is 180 minutes to 250 minutes. Step 2) For one refining, the temperature of the refining furnace is controlled at 1600 degrees Celsius to 1700 degrees Celsius, and air is blown and stirred for 20 minutes to 30 minutes, and then the refining furnace is heated to 1750 degrees Celsius to 1780 degrees Celsius for refining, and the time is 120 minutes to 180 minutes. Step 3) Secondary refining, using a vacuum refining furnace with a temperature of 1600 degrees Celsius to 1650 degrees Celsius, and a time of 50 minutes to 80 minutes. Step 4) Forming, firstly use a continuous casting machine for continuous casting, and then heat-treat the formed counterweight, control the temperature of the heating section of the heating furnace at 800 degrees Celsius-980 degrees Celsius, and control the temperature of the soaking section at 1000 degrees Celsius-1050 degrees Celsius , The temperature of the furnace outlet is controlled at 1100 degrees Celsius-1140 degrees Celsius. Step 5) Cooling, grinding, pickling, shot blasting, first use a cooling furnace to cool the formed counterweight, then use the machine tool to grind the surface of the counterweight, and then acidify the reground weight For washing treatment, the concentration of the pickling solution is 8%-10%, and the pickling time is 10 minutes-25 minutes. Finally, the pickled counterweight is shot blasted by a shot blasting machine, washed and dried.

[0020] Further preferably, in the step 1), the second blowing process is performed in the primary refining, the mixed gas of the first blowing is 45% oxygen and 55% nitrogen, and the mixed gas of the second blowing is 60% oxygen and 40% nitrogen. The temperature of the refining furnace is controlled at 1600 degrees Celsius to 1650 degrees Celsius during one blow; the temperature of the refining furnace is controlled at 1670 degrees Celsius to 1690 degrees Celsius during one blow; the blowing and stirring gas is a mixed gas of argon and oxygen, argon The content is 20%-35%, and the oxygen content is 65%-80%; in the step 4), during the continuous casting of the continuous casting machine, the secondary refined solution is energized and stirred, and the secondary refined solution is added to the electromagnetic The equipment of the coil is energized, the current is 30-35A, and the electromagnetic force generated by the electromagnetic coil is between 7Hz-12Hz.

[0021] Example two

[0022] The steel pin compression molding elevator counterweight of the present invention, the chemical composition of the counterweight is as follows in weight percentage, C: ≤0.15-0.25%, Si: 0.20-0.40%, Mn: 0.75-0.35%, P :≤0.03-0.05%, S: ≤0.025-0.050%, Cr: 12.5-16.5%, N: 0.30-0.55%, Mo: 0.20-0.4%, also including alloying element V, where V is by weight percentage: 0.15 -0.20%.

[0023] A method for preparing steel pin compression molding elevator counterweights of the present invention includes the following steps: Step 1) Melting the above-mentioned raw materials according to the ratio, charging the raw materials into a melting furnace through an automatic feeding machine, and then controlling the temperature of the melting furnace At 1780 degrees Celsius to 1850 degrees Celsius, the melting time is 180 minutes to 250 minutes. Step 2) For one refining, the temperature of the refining furnace is controlled at 1600 degrees Celsius to 1700 degrees Celsius, and air is blown and stirred for 20 minutes to 30 minutes, and then the refining furnace is heated to 1750 degrees Celsius to 1780 degrees Celsius for refining, and the time is 120 minutes to 180 minutes. Step 3) Secondary refining, using a vacuum refining furnace with a temperature of 1600 degrees Celsius to 1650 degrees Celsius, and a time of 50 minutes to 80 minutes. Step 4) Forming, firstly use a continuous casting machine for continuous casting, and then heat-treat the formed counterweight, control the temperature of the heating section of the heating furnace at 800 degrees Celsius-980 degrees Celsius, and control the temperature of the soaking section at 1000 degrees Celsius-1050 degrees Celsius , The temperature of the furnace outlet is controlled at 1100 degrees Celsius-1140 degrees Celsius. Step 5) Cooling, grinding, pickling, shot blasting, first use a cooling furnace to cool the formed counterweight, then use the machine tool to grind the surface of the counterweight, and then acidify the reground weight For washing treatment, the concentration of the pickling solution is 8%-10%, and the pickling time is 10 minutes-25 minutes. Finally, the pickled counterweight is shot blasted by a shot blasting machine, washed and dried.

[0024] Further preferably, in the step 1), the second blowing process is performed in the primary refining, the mixed gas of the first blowing is 45% oxygen and 55% nitrogen, and the mixed gas of the second blowing is 60% oxygen and 40% nitrogen. The temperature of the refining furnace is controlled at 1600 degrees Celsius to 1650 degrees Celsius during one blow; the temperature of the refining furnace is controlled at 1670 degrees Celsius to 1690 degrees Celsius during one blow; the blowing and stirring gas is a mixed gas of argon and oxygen, argon The content is 20%-35%, and the oxygen content is 65%-80%; in the step 4), during the continuous casting of the continuous casting machine, the secondary refined solution is energized and stirred, and the secondary refined solution is added to the electromagnetic The equipment of the coil is energized, the current is 30-35A, and the electromagnetic force generated by the electromagnetic coil is between 7Hz-12Hz.

[0025] Example three

[0026] The steel pin compression molding elevator counterweight of the present invention, the chemical composition of the counterweight is as follows in weight percentage, C: ≤0.15-0.25%, Si: 0.20-0.40%, Mn: 0.75-0.35%, P : ≤0.03-0.05%, S: ≤0.025-0.050%, Cr: 12.5-16.5%, N: 0.30-0.55%, Mo: 0.20-0.4%, V: 0.15-0.20%, also including alloying element Nb, which Nb by weight percentage is 0.30-0.60%.

[0027] A method for preparing steel pin compression molding elevator counterweights of the present invention includes the following steps: Step 1) Melting the above-mentioned raw materials according to the ratio, charging the raw materials into a melting furnace through an automatic feeding machine, and then controlling the temperature of the melting furnace At 1780 degrees Celsius to 1850 degrees Celsius, the melting time is 180 minutes to 250 minutes. Step 2) For one refining, the temperature of the refining furnace is controlled at 1600 degrees Celsius to 1700 degrees Celsius, and air is blown and stirred for 20 minutes to 30 minutes, and then the refining furnace is heated to 1750 degrees Celsius to 1780 degrees Celsius for refining, and the time is 120 minutes to 180 minutes. Step 3) Secondary refining, using a vacuum refining furnace with a temperature of 1600 degrees Celsius to 1650 degrees Celsius, and a time of 50 minutes to 80 minutes. Step 4) Forming, firstly use a continuous casting machine for continuous casting, and then heat-treat the formed counterweight, control the temperature of the heating section of the heating furnace at 800 degrees Celsius-980 degrees Celsius, and control the temperature of the soaking section at 1000 degrees Celsius-1050 degrees Celsius , The temperature of the furnace outlet is controlled at 1100 degrees Celsius-1140 degrees Celsius. Step 5) Cooling, grinding, pickling, shot blasting, first use a cooling furnace to cool the formed counterweight, then use the machine tool to grind the surface of the counterweight, and then acidify the reground weight For washing treatment, the concentration of the pickling solution is 8%-10%, and the pickling time is 10 minutes-25 minutes. Finally, the pickled counterweight is shot blasted by a shot blasting machine, washed and dried.

[0028] Further preferably, in the step 1), the second blowing process is performed in the primary refining, the mixed gas of the first blowing is 45% oxygen and 55% nitrogen, and the mixed gas of the second blowing is 60% oxygen and 40% nitrogen. The temperature of the refining furnace is controlled at 1600 degrees Celsius to 1650 degrees Celsius during one blow; the temperature of the refining furnace is controlled at 1670 degrees Celsius to 1690 degrees Celsius during one blow; the blowing and stirring gas is a mixed gas of argon and oxygen, argon The content is 20%-35%, and the oxygen content is 65%-80%; in the step 4), during the continuous casting of the continuous casting machine, the secondary refined solution is energized and stirred, and the secondary refined solution is added to the electromagnetic The equipment of the coil is energized, the current is 30-35A, and the electromagnetic force generated by the electromagnetic coil is between 7Hz-12Hz.