Alloy steel forged steel round bar for heavy-duty gear and preparation method thereof

A technology of alloy steel and forging circles, which is applied in the field of alloy steel forging circles for heavy-duty gears and its preparation, can solve the problems of difficult control of smelting process, influence on alloy mechanical properties, unstable grain refinement effect, etc., and achieve mechanical Improve performance, improve hardenability, reduce the effect of small deformation rate

Inactive Publication Date: 2019-01-25

JIANGSU ZHUHONG FORGING

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Problems solved by technology

[0003] In this regard, the traditional method is to control the content of Al and [N], or to add microalloying elements such as Ti and B. These methods are difficult to con...

Method used

As can be seen from the above table two, the grain size level of the forged circle of the present application is high, and its overall carburizing and quenching deformation is small, and its compressive strength, yield strength, elongation, reduction of area, impact The mechanical properties such as power a...

Abstract

The invention discloses an alloy steel forged steel round bar for a heavy-duty gear, solves the problems of a large deformation rate and poor mechanical property of carburizing and quenching and relates to the field of alloy. The alloy steel forged steel round bar is prepared from the ingredients in mass percent: 0.33 to 0.38% of C, 0.55 to 0.80% of Mn, 0.15 to 0.35% of Si, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, 1.50 to 1.70% of Cr, 1.50 to 1.70% of Ni, 0.23 to 0.30% of Mo, 0.020 to 0.040% of Al, smaller than or equal to 0.20% of Cu, smaller than or equal to 0.05% of V and the balance of Fe and unavoidable impurities. The alloy steel forged steel round bar has a small deformation rate in carbonizing and quenching, the mechanical property is stronger, and the alloy steel forged steel round bar is suitable for producing gears; furthermore, the preparation method of the alloy steel forged steel round bar is more convenient and more suitable for scale production.

Technology Topic

Round barAlloy steel +4

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Examples

Experimental program(1)
Effect test(1)

Example Embodiment

[0036] A method for preparing an alloy for heavy-duty gears includes the following steps:

[0037] Step 1. According to mass fraction, add steel containing C1.65~1.79%, Mn0.67~0.93%, P0.13~0.25%, S0.16~0.20% and A10.13~0.19% to the converter After smelting, artificial graphite, deoxidizer, copper-silicon alloy, chromium, nickel, molybdenum, aluminum, vanadium and other metal elements are sequentially added to the converter, and Ar is blown from the bottom of the converter to control the oxygen pressure ≥0.8Mpa, The end point of smelting is C0.56~0.64%, P≤0.016%, the temperature of molten iron reaches 1620~1645℃, and then tapping is carried out;

[0038] Step 2. The molten steel tapped in step 1 is transferred to the LF furnace for refining, and Ar is blown from the bottom of the LF furnace, while lime, silicon carbide, calcium carbide and fluorite are added to the LF furnace for slagging. The first power-on uses 6-level voltage to slag, and the power is sent to heat the slag for 10 minutes. The second power-on uses 4-level voltage, and at the same time, 2~3 batches of white ash are added, the total amount is ≥500Kg, and then 150~200m of silicon calcium wire is fed to the LF furnace /Furnace, feed line speed is 3~5m/s, and finally hoist the ladle;

[0039] Step 3. Lift the ladle in step 2 into the VD furnace, and blow Ar from the bottom of the VD furnace, and carry out the vacuum degassing treatment at the same time. When the vacuum degree reaches 0.5 Torr or less, the holding time is ≥15min, and then Carry out soft blowing treatment, and at the same time add carbonized rice husk to the VD furnace to cover the whole slag surface, keep it for 20 minutes, and finally carry out the lifting bag out of the furnace;

[0040] Step 4. Pass the ladle through the continuous casting machine to inject the billet, and add the tundish covering agent when the tundish molten steel reaches 2/3 of the height after the tundish is opened, and when the molten steel reaches the maximum, add the carbonized rice husk, and the whole process Control the temperature of the continuous casting tundish steel to 1483~1498℃, and use the mold to protect the high-carbon mold flux, and finally obtain the steel billet;

[0041] Step 5: Forging the steel billet, and quenching and tempering the steel billet by oil quenching at 850°C, and then tempering at 600°C for heat treatment to obtain a steel ingot;

[0042] Step 6: Reheat the steel ingot to 1190-1200°C, then hoist it to the forging press, first forge it into a square, then press the edge, and finally press it into a circle to obtain a forging circle.

[0043] Here, the deoxidizer is silicon aluminum barium deoxidizer, and the covering agent is charcoal after dry distillation.

[0044] According to the above-mentioned operation method, the component contents of the forging circle of Example 1 to Example 8 in Table 1 are respectively obtained:

[0045] Table I

[0046]

[0047]

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Classification and recommendation of technical efficacy words

Improve hardenability
grain refinement

Large-section high-performance hot work die steel for die casting and preparation technology thereof

ActiveCN104046915AImprove hardenabilityImprove hardening

Owner:RUGAO HONGMAO HEAVY FORGING

High-carbon steel wire with good fine steel cord drawing machining performance and manufacturing method of high-carbon steel wire

ActiveCN105624564AImprove hardenabilityReduce interlamellar spacing

Owner:JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD

Alloy steel forged steel round bar for heavy-duty gear and preparation method thereof

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Description & Claims & Application Information

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