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Round steel with low magnetic mark rate, crankshaft forging and manufacturing method thereof

A manufacturing method and technology of round steel, applied in the direction of crankshaft, etc., can solve the problems such as difficult control of non-quenched and tempered crankshaft magnetic marks, scrapped crankshaft, and reduced fatigue life of crankshaft

Active Publication Date: 2019-12-24
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The round steel is forged into a crankshaft blank, and the crankshaft is obtained after finishing the crankshaft blank. Magnetic particle inspection is carried out on the surface of the crankshaft. If there are magnetic defects on the surface of the crankshaft, the fatigue life of the crankshaft will be significantly reduced, and the crankshaft will be scrapped.
[0003] In the prior art, it is very difficult to control the magnetic traces of the non-quenched and tempered crankshaft, and it is difficult to stably control the magnetic trace rate within 2%

Method used

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  • Round steel with low magnetic mark rate, crankshaft forging and manufacturing method thereof
  • Round steel with low magnetic mark rate, crankshaft forging and manufacturing method thereof
  • Round steel with low magnetic mark rate, crankshaft forging and manufacturing method thereof

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experiment example

[0069] The composition of round steel with low magnetic trace rate is shown in Table 1.

[0070] The composition (weight / %) of the round steel of table 1 low magnetic trace rate

[0071] C Si mn P S Mo V Cr Al N Ceq Example 1 0.46 0.26 1.08 0.015 0.004 0.01 0.07 0.18 0.011 0.0124 0.87 Example 2 0.49 0.25 1.14 0.012 0.005 0.01 0.08 0.17 0.009 0.0118 0.92 Example 3 0.48 0.29 1.07 0.010 0.003 0.01 0.08 0.17 0.010 0.0133 0.90 Comparative example 1 0.51 0.26 1.18 0.016 0.003 0.01 0.07 0.18 0.012 0.0136 0.94 Comparative example 2 0.47 0.23 1.11 0.013 0.004 0.01 0.09 0.19 0.009 0.0127 0.91 Comparative example 3 0.46 0.28 1.09 0.009 0.002 0.01 0.08 0.20 0.013 0.0115 0.89

[0072]The main production process parameters of low magnetic trace rate round steel and crankshaft forgings are shown in Table 2,

[0073] Table 2 The main production process parameters of rou...

Embodiment 1

[0083] It can be seen from Example 1 that the composition of round steel satisfies C: 0.46-0.50%, Si: 0.20-0.30%, Mn: 1.05-1.15%, P≤0.020%, S≤0.035%, Cr≤0.25%, Mo≤ 0.05%, Al≤0.030%, V: 0.06-0.10%, N: 0.010-0.018%, Ceq: 0.87-0.92%; and the manufacturing method of the round steel satisfies the above conditions. The properties of the obtained round steel meet: tensile strength ≥ 850MPa, elongation A ≥ 17%, band structure ≤ 1.5, C segregation at the center of 4%, C segregation at the cross-section R / 2 of the round steel The value is 4.8%. Using it to prepare crankshaft forgings, the performance of the obtained crankshaft forgings meets: tensile strength ≥ 870MPa, elongation after forging ≥ 11%, metallographic structure includes ferrite and pearlite, does not contain bainite, and Brinell hardness is 240 -260HBW, magnetic trace rate is 1.1%.

[0084] As can be seen from Comparative Example 1, if the C content in the round steel is greater than 0.50%, the Mn content is greater than...

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Abstract

The application provides a round steel with low magnetic mark rate, a crankshaft forging and a manufacturing method thereof, and belongs to the technical field of crankshafts. The round steel comprises 0.46-0.50% of C, 0.20-0.30% of Si, 1.05-1.15% of Mn, not greater than 0.020%of P, not greater than 0.035%of S, not greater than 0.25% of Cr, not greater than 0.05%of Mo, not greater than 0.030% of Al, 0.06-0.10% of V, and 0.010-0.018% of N, wherein the carbon equivalent Ceq=C+Si / 6+Mn / 5+Cr / 4+1.5V; Ceq ranges from 0.87-0.92%; the tensile strength of the round steel is not less than 850MPa; the elongation A is not less than 12%; the band-shaped tissue is less than or equal to grade 2.0; and the C segregation values of the R / 2 part of the cross section and the core part of the round steel are less than or equal to 10%. The round steel is used for preparing the crankshaft forging, and the magnetic mark rate of the crankshaft forging can be reduced.

Description

technical field [0001] The present application relates to the technical field of crankshafts, in particular to a round steel with a low magnetic trace rate, a crankshaft forging and a manufacturing method thereof. Background technique [0002] Round steel is forged into a crankshaft blank, and the crankshaft is obtained after finishing the crankshaft blank. Magnetic particle inspection is performed on the surface of the crankshaft. If there are magnetic defects on the surface of the crankshaft, the fatigue life of the crankshaft will be significantly reduced, and the crankshaft will be scrapped. [0003] In the prior art, it is difficult to control the magnetic marks of the non-tempered crankshaft, and it is difficult to stably control the magnetic mark rate within 2%. Contents of the invention [0004] The purpose of this application is to provide a round steel with a low magnetic trace rate, a crankshaft forging and its manufacturing method, which can effectively reduce ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C22C38/24C22C38/22B22D11/115B22D11/12F16C3/06
CPCB22D11/115B22D11/1206C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/12C22C38/22C22C38/24F16C3/06
Inventor 刘年富黄铸铭周成宏钟芳华
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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