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Non-quenched and tempered steel for crankshaft, crankshaft forging and its preparation process

A technology of non-quenched and tempered steel and preparation process, which is applied in the field of crankshaft forgings and its preparation process, and non-quenched and tempered steel for crankshafts. It can solve the problems of high cost, complicated production process, and increased alloy elements, and achieve qualified hardenability, The effect of increased elongation and enhanced tensile strength

Active Publication Date: 2021-04-30
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of V and Ti will increase the types of alloying elements, and the production process of non-quenched and tempered steel for crankshafts is complicated and costly

Method used

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  • Non-quenched and tempered steel for crankshaft, crankshaft forging and its preparation process
  • Non-quenched and tempered steel for crankshaft, crankshaft forging and its preparation process
  • Non-quenched and tempered steel for crankshaft, crankshaft forging and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] The composition of non-quenched and tempered steel for crankshaft is shown in Table 1,

[0077] The composition of the non-quenched and tempered steel used in table 1 crankshaft (weight / %)

[0078]

[0079] The preparation process parameters of non-quenched and tempered steel for crankshaft are shown in Table 2,

[0080] Table 2 The preparation process parameters of non-quenched and tempered steel for crankshaft

[0081]

[0082]

[0083] The non-quenched and tempered steel for crankshafts was prepared using the preparation process parameters provided in Example 1-Example 5 and Comparative Example 1-Comparative Example 8. Use the obtained crankshaft to carry out the preparation of crankshaft forging with non-quenched and tempered steel, the preparation process parameters of crankshaft forging are as table 3,

[0084] Table 3 Preparation Process Parameters of Crankshaft Forgings

[0085] Crankshaft heating temperature / °C Crankshaft heating time / ...

experiment example 1

[0087] Detect performance, organization of the non-quenched and tempered steel for crankshaft that embodiment 1-embodiment 7 and comparative example 1-comparative example 6 provide, as table 4,

[0088] Among them, the detection method of the mechanical properties is: heating the samples according to the temperature of 1150-1250° C., then cooling in air, and testing the mechanical properties (strength, elongation and Brinell hardness) of the heat-treated samples. The detection method of hardenability is: take samples according to the normalizing temperature of 860±5°C, and then detect the hardenability value of the round steel after the end quenching treatment. The detection method of the band structure is: take the rolled round steel and detect the band structure at the 1 / 2 radius position of the round steel according to the national standard.

[0089] Table 4 Properties and structures of non-quenched and tempered steels for crankshafts

[0090]

[0091]

[0092] Detec...

experiment example 2

[0107] The crankshaft that embodiment 1, embodiment 4 and comparative example 2 provide is carried out the detection of segregation control situation with non-quenched and tempered steel as figure 1 . From figure 1 It can be seen that the segregation control of the non-quenched and tempered steel for crankshaft provided by Example 1 is better than that of the non-quenched and tempered steel for crankshaft provided by Comparative Example 2. The segregation control of the non-quenched and tempered steel for the crankshaft provided by Example 1 is better than the segregation control of the non-quenched and tempered steel for the crankshaft provided by Example 4. It shows that the value of Mn is too large, or the value of Mn is too small, will affect the segregation control of non-quenched and tempered steel for crankshaft.

[0108] Detect the metallographic pictures of the crankshaft forgings obtained in Example 1 and Comparative Example 1. in, Figure 2A The metallographic i...

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Abstract

The application provides a non-quenched and tempered steel for a crankshaft, a crankshaft forging and a preparation process thereof, which belong to the technical field of non-quenched and tempered steel. Non-quenched and tempered steel by weight percentage: C 0.36‑0.39%, Si 0.50‑0.65%, Mn 1.35‑1.50%, P 0‑0.030%, S 0.040‑0.055%, Cr 0‑0.25%, Mo 0‑0.20 %, Al 0‑0.03%, N 0.010‑0.020%, carbon equivalent Ceq=0.75‑0.81%. The hardenability of non-quenched and tempered steel is: J5mm 47‑52HRC, J9mm 35‑42HRC, J13mm 30‑36HRC; tensile strength ≥ 760MPa; elongation A ≥ 14%; band structure ≤ 2.0; Brinell hardness is 220‑250HBW, suitable for making crankshaft forgings.

Description

technical field [0001] The present application relates to the technical field of non-quenched and tempered steel, in particular to a non-quenched and tempered steel for a crankshaft, a crankshaft forging and a preparation process thereof. Background technique [0002] The crankshaft is the main rotating part of the engine. After the connecting rod is installed, the up and down (reciprocating) motion of the connecting rod can be changed into a circular (rotating) motion. It is an important part of the engine. The material of the crankshaft is made of carbon structural steel or ductile iron. Two important parts of the crankshaft are: the main journal and the connecting rod journal. The main journal is installed on the cylinder block, the connecting rod journal is connected with the large end hole of the connecting rod, and the small end hole of the connecting rod is connected with the cylinder piston, which is a typical slider crank mechanism. The crankshaft is subject to str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/60C22C38/06C21D8/06B22D11/115C21C7/06C21C7/10F16C3/06
CPCB22D11/115C21C7/0056C21C7/06C21C7/10C21D8/065C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/22C22C38/60F16C3/06F16C2204/62F16C2204/74
Inventor 刘年富岳峰周成宏莫家让王庆贺
Owner SGIS SONGSHAN CO LTD
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