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Carburizing method capable of adjusting nitrogen-methanol atmosphere proportion

An adjustable methanol technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of high proportion of chemical consumption in carburizing furnaces, and achieve the effect of reducing consumption

Pending Publication Date: 2022-05-13
SHANGHAI AUTOMOBILE GEAR WORKS
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  • Application Information

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Problems solved by technology

[0004] The present invention aims at the defect that the nitrogen and methanol of the nitrogen-methanol atmosphere furnace in the prior art are used as the normal flux, which accounts for a relatively large proportion of the chemical consumption of the carburizing furnace. Under the premise of carburizing speed, the nitrogen consumption can be saved by more than 30%.

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  • Carburizing method capable of adjusting nitrogen-methanol atmosphere proportion
  • Carburizing method capable of adjusting nitrogen-methanol atmosphere proportion

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Embodiment Construction

[0015] This embodiment selects the transmission gear as the test part, the part material is 20MnCr5, the depth of the carburized layer is required to be: 550HV1: 0.50-0.80mm, the metallographic structure of the carburized layer is carbide of grade 1-4, and the residual of grade 1-5 Austenite, non-martensite structure ≤0.020mm.

[0016] The carburizing process of this embodiment adopts Aichelin VKES2 / 4 type box-type multi-purpose furnace, uses propane as carburizing and enriching agent, and HOUGHTON quenching oil.

[0017] The specific carburizing method of this embodiment, the existing methanol 4.0L / h, nitrogen 4.5m 3 / h; adjusted to: methanol 4.0L / h, nitrogen 3.4m 3 / h, the CO value of the oxygen probe is corrected from 20% to 23%. After the nitrogen flow rate decreased, the furnace pressure showed a drop from 300pa to 290pa, and the carburizing enriched gas propane did not change. The carbon potential of the whole carburizing process is stable, without increasing fluctuat...

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Abstract

The invention relates to a carburizing method capable of adjusting the nitrogen-methanol atmosphere ratio, which comprises the following steps: reducing the introduction amount of nitrogen from 4.5 m < 3 > / h to 3.4 m < 3 > / h under the condition of keeping the methanol flow at 4.0 L / h, namely adjusting the ratio of CH3OH to N2 in pyrolysis gas from 1: 1.1 to 1: 0.9; meanwhile, after the CO value of the oxygen probe is adjusted and corrected to be 23%, variable oxygen content measurement is carried out, and the carbon potential is controlled in a mode of adding propane or air. On the premise that the original carburizing speed is guaranteed, the using amount of nitrogen can be saved by 30% or above.

Description

technical field [0001] The invention relates to a technology in the field of carburizing, in particular to a method for adjusting the ratio of a heat treatment carburizing atmosphere into a medium used in a part carburizing process. Background technique [0002] Nitrogen methanol atmosphere carburizing is widely used in the field of carburizing and quenching. The advantage is that the generated atmosphere is stable. The disadvantage is that the equipment needs to consume a large amount of nitrogen and the production cost is high. Thermodynamically, when the temperature exceeds 700°C, the methanol cracking equation of the main medium is: CH 3 OH-→CO+2H 2 , the methanol introduced is liquid, and the gas production per liter of liquid methanol is 1.67m 3 . According to the usual CH 3 OH:N 2 =1:1.1 (methanol 4.0L / h, nitrogen 4.5m 3 / h) nitrogen methanol atmosphere, the gas composition in the furnace after the actual pyrolysis is: CO: 40.*1.67 / 3=2.2, H 2 : 2*4.0*1.67 / 3=4.4...

Claims

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Application Information

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IPC IPC(8): C23C8/20
CPCC23C8/20
Inventor 朱永新黄勇卞凯强陈慧清
Owner SHANGHAI AUTOMOBILE GEAR WORKS
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