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Heat-treatment method for 48MnV non quenched and tempered steel crankshaft forging

A heat treatment method and technology for non-quenched and tempered steel, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of incomplete satisfaction, decreased strength performance, coarse pearlite grains, etc., to reduce energy consumption, improve plasticity and Toughness, the effect of simplifying the process

Inactive Publication Date: 2013-10-16
GUIZHOU ANDA AVIATION FORGING
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Problems solved by technology

Although this method performs secondary phase transformation treatment on non-quenched and tempered steel crankshaft forgings after forging, which increases the relative content of ferrite and improves plasticity and toughness, but due to the effect of slow cooling, the pearlite grains are also coarse. , its strength performance declines more seriously
The crankshaft treated by this method has a tensile strength of 776 MPa to 860 MPa and a yield strength of 490 MPa to 560 MPa, which cannot fully meet the customer's requirements for tensile strength ≥ 800 MPa and yield strength ≥ 500 MPa

Method used

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  • Heat-treatment method for 48MnV non quenched and tempered steel crankshaft forging

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[0012] The main chemical element content (percentage by weight) of the steel is: C content 0.44% ~ 0.49%, Si content 0.25% ~ 0.45%, Mn content 1.00% ~ 1.30%, P content ≤ 0.035%, S content 0.007%~0.020%, V content 0.09%~0.14%, Cr content 0.10%~0.25%, Ni content ≤0.30%, Cu content ≤0.20%, the balance is Fe.

[0013] The heat treatment process steps of the steel crankshaft forging are as follows:

[0014] Heat the 48MnV non-quenched and tempered steel crankshaft forgings to 30°C~50°C above the austenitization temperature, keep the heat preservation according to the thickness of the forgings at 1min / mm~3 min / mm, and then cool at a cooling rate of 30°C / min~40°C / min To 300°C, disperse and air cool. The austenitizing temperature of this steel is 880°C.

[0015] The comparison results of various technical indicators of the 48MnV non-quenched and tempered steel crankshaft forgings heat-treated by the above method and the prior art (CN1900328A) are shown in Table 1:

[0016] Table 1 ...

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Abstract

The invention discloses a heat-treatment method for 48MnV non quenched and tempered steel crankshaft forging. The technical scheme comprises following steps: heating a 48MnV non quenched and tempered steel crankshaft forging until the temperature exceeds the austenitizing temperature in a range of 30 DEG C to 50 DEG C; maintaining the temperature according to the forging thickness of 1 min / mm to 3 min / mm; rapidly cooling the temperature to 300 DEG C at a speed of 30 DEG C / min to 40 DEG C / min, cooling by air in disperse, and the austenitizing temperature is 880 DEG C. Crankshaft forgings possessed by the heat-treatment method can totally meet the customers' requirement on strength index and each technical index, and are mainly used for automobile engines.

Description

technical field [0001] The invention relates to a heat treatment method for a forging, in particular to a heat treatment method for a 48MnV non-quenched and tempered steel crankshaft forging. Background technique [0002] Non-quenched and tempered steel is formed by adding trace amounts of alloying elements such as Mn, V, Ti, Nb and N to carbon steel. Non-quenched and tempered steel forgings, such as automobile crankshafts, can disperse and precipitate carbon (nitrogen) compounds in ferrite and pearlite as strengthening phases through temperature-controlled forging and temperature-controlled cooling during forging, so that forgings do not need to be quenched and tempered after forging The mechanical properties achieved by carbon structural steel or alloy structural steel after quenching and tempering can be obtained. [0003] The Chinese invention patent specification CN1900328A published on January 24, 2007 discloses a heat treatment process for a crankshaft of a large non...

Claims

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Application Information

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IPC IPC(8): C21D9/30
Inventor 杨仁堂罗桂海李兴品韩剑波龚海飞顾莉莉高先模
Owner GUIZHOU ANDA AVIATION FORGING
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