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Manufacturing method of steel forged component of 18CrNiMo7-6 large gear

A large-scale gear and manufacturing method technology, applied in the production of alloy structural steel 18CrNiMo7-6 gear steel, large-scale gear steel forgings manufacturing field, can solve the narrow hardenability zone durability, large-scale gear steel cutting difficulty, white spot quality, etc. question

Active Publication Date: 2012-04-25
FUSHUN SPECIAL STEEL SHARES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to disclose a manufacturing method of 18CrNiMo7-6 large-scale gear steel forgings. By adopting the heat treatment process of isothermal annealing and controlling the furnace cooling speed, the dual purposes of dehydrogenation and obtaining F+P structure are achieved; The narrow range of chemical elements C, Mn, Nb, Al, and N that have a significant impact on the natur

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  • Manufacturing method of steel forged component of 18CrNiMo7-6 large gear
  • Manufacturing method of steel forged component of 18CrNiMo7-6 large gear
  • Manufacturing method of steel forged component of 18CrNiMo7-6 large gear

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Embodiment 1

[0053] Furnace number: 10203011386, finished hole cake specifications: outer diameter 1129mm x inner diameter 442mm x height 291mm, forging ratio 11.8.

[0054] Process flow: Electric Furnace→LF→VD→Ingot Casting→Chamber Furnace Heating→3500 Fast Forging Forging (Two Upsetting and Two Drawing Processes)→Middle Billet Annealing→Middle Billet Cutting→Chamber Furnace Heating→3500 Fast Forging Forging Finished Hole Cake → Hole cake annealing.

[0055] (1) Steelmaking process

[0056] ①Chemical composition

[0057] The chemical composition standard of 18CrNiMo7-6 is shown in Table 4.

[0058] Table 4

[0059]

[0060] ②Electric furnace process

[0061] Use 30% of scrap steel and pig iron; tap temperature 1670°C, P content 0.010%, end point carbon 0.010%, reduce oxygen intensity 3 minutes before tapping, increase carbon spray dosage by 378Kg; add aluminum 162kg for final deoxidation; free space 810mm, no oxidation slag.

[0062] ②LF process

[0063] Feed aluminum at 0.08% w...

Embodiment 2

[0088] Furnace number: 10203022144, finished product specification φ390mm, forging ratio 9.9; process flow: electric furnace→LF→VD→ingot casting→chamber furnace heating→2000 fast forging (one upsetting and one drawing process)→steel annealing.

[0089] (1) Steelmaking process

[0090] ①Chemical composition

[0091] The chemical composition standard of 18CrNiMo 7-6 is shown in Table 8.

[0092] Table 8

[0093]

[0094] ②Electric furnace process

[0095] Use 30% of scrap steel and pig iron; tap temperature 1680°C, P content 0.0093%, end point carbon 0.072%, reduce oxygen intensity 3 minutes before tapping, increase carbon spray dosage by 400Kg; add aluminum 150kg for final deoxidation; free space 820mm, no oxidation slag.

[0096] ③LF process

[0097] Feed aluminum at 0.08% when in place, use carbon powder + Al particle diffusion deoxidation throughout the process, add 30Kg in the first batch, and keep white slag for 33 minutes; according to the results of all aluminum ...

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Abstract

The invention discloses a manufacturing method of a steel forged component of an 18CrNiMo7-6 large gear. The process route comprises: electric furnace, LF (low frequency), VD (voltage detection), ingots of 9-27t, production with a 3500 quick forging machine, heat treatment, straightening and rough turning. The narrow composition scope of chemical elements such as C, Mn, Nb, Al and N with significant impact on the steel hardenability and grain size is strictly controlled to achieve dual purposes of narrow hardenability band, qualified grain size and grain size durability; the smelting process is strictly implemented to improve the steel purity; and the isothermal annealing and heat treatment with the furnace cooling speed controlled are adopted to achieve dual purposes of dehydrogenation and preparation of a structure with F and P. The invention has the advantages that the 18CrNiMo7-6 steel completely meeting technical requirements can be developed via improving the purity, ensuring the narrow hardenability band, realizing the grain size durability and adopting the unique heat treatment process, and the quality problems of manufacturing large gears such as difficulty in steel cutting, quenching cracks, coarse grains and white spots can be solved.

Description

technical field [0001] The invention belongs to the field of metal material manufacturing and discloses a method for manufacturing a large gear steel forging, which is mainly used for the production of alloy structural steel 18CrNiMo7-6 gear steel. Background technique [0002] 18CrNiMo7-6 is a German brand, and the original brand is 17CrNiMo6. With the rapid development of the reducer machinery industry, wind power industry, and high-speed rail industry, 18CrNiMo7-6 is used as the leading application material for key parts of gears or gear shafts. In order to ensure the high efficiency of its products , safe operation, users constantly put forward new requirements for material quality and technical indicators. In order to reduce the deformation of large gears, the hardenability bandwidth of forgings is reduced from the original 7HRC to 5HRC, and the requirements for banded structure are put forward; in order to improve cutting efficiency, It is required that the delivery st...

Claims

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Application Information

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IPC IPC(8): C22C38/44C21C5/52C21C7/10C21C7/06C21D8/00B22D1/00
CPCY02P10/20
Inventor 冯桂萍秋立鹏阚志王连海刘金鑫程丽杰薛井恒段永生郭晓俊马群赵敏陈明纪肖
Owner FUSHUN SPECIAL STEEL SHARES
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