A kind of heat treatment method of medium carbon low alloy steel

A heat treatment method and low-alloy steel technology, applied in the field of casting casting production, can solve the problems of elongation and area shrinkage that cannot meet the standard requirements, low plasticity and mechanical properties, and easy fracture of crawler links, etc., to achieve elongation and High area shrinkage, good core plasticity and long service life

Active Publication Date: 2021-11-30
HUSN CASTING ANHUI YINGLIU GROUP
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Problems solved by technology

[0003] At present, the heat treatment method of medium-carbon low-alloy steel generally adopts a three-step process of normalizing, quenching and tempering, but the plasticity and mechanical properties of the obtained product are not high, and the elongation and reduction of area cannot meet the standard requirements. This product For large excavator crawler parts, the track link is prone to breakage during actual use, which greatly reduces the service life of the casting

Method used

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  • A kind of heat treatment method of medium carbon low alloy steel
  • A kind of heat treatment method of medium carbon low alloy steel
  • A kind of heat treatment method of medium carbon low alloy steel

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Experimental program
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Embodiment 1

[0028] A heat treatment method for medium-carbon low-alloy steel, comprising the steps of:

[0029] S1, preparation of castings: with 1E4904 type medium carbon low alloy steel material raw material, utilize mold casting to make double Kiel test block, the size mark of test block is carried out according to ASTM A703 (such as figure 1 shown).

[0030] In terms of element mass percentage, the chemical composition (%) of the above-mentioned digeer test block is: C: 0.16~0.28; Si: 0.30~0.70; Mn: 0.70~1.35; P≤0.025; S≤0.020; Cr: 0.70~ 1.10; Ni: 1.10-2.20; Mo: 0.40-0.55. The chemical composition needs to be strictly controlled, and P and S are controlled according to the lower limit.

[0031] The mechanical property control of the above-mentioned 1E4904 medium-carbon low-alloy steel is shown in Table 1:

[0032] Table 1: Mechanical property requirements of 1E4904 medium carbon low alloy steel

[0033] Rp 0.2 MPa

RPmMpa A(％) Z(％) Akv / -40℃ ≥965 ≥1138 ≥4 ...

Embodiment 2

[0040] Embodiment 2 (control group):

[0041] Using the prior art normalizing + quenching + tempering process, the same casting product was prepared as a control group. Concrete process step is identical with embodiment 1, and the casting double Kiel test block of test and the double Kiel test block of embodiment 1 are the product of pouring in the same furnace. The difference is that the "S3 annealing" step is missing, and the finished casting is obtained.

[0042] The heat treatment furnaces in Embodiment 1 and Embodiment 2 are laboratory box-type muffle furnaces.

[0043] Embodiment 1, embodiment 2 all implement 3 times, be respectively embodiment 3-6, and detect product performance, the product performance obtained, see table 2:

[0044] Table 2: Properties of 1E4904 medium carbon low alloy steel products obtained by different heat treatment processes

[0045] craft Rp 0.2 MPa

[0046] Wherein, embodiments 1, 3, and 5 are experimental groups using the proc...

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Abstract

The invention relates to a heat treatment method for medium-carbon low-alloy steel. The medium-carbon low-alloy steel is used as a raw material, and the steps of S1 preparation of castings, S2 normalizing, S3 annealing, S4 quenching, S5 tempering, and S6 finished products are completed. The whole process of heat treatment of medium carbon low alloy steel. The heat treatment method of the medium-carbon low-alloy steel of the present invention adopts a stable normalizing + annealing + quenching + tempering process, which can completely refine the crystal grains and uniform structure of the product, and then cooperate with water quenching treatment, the obtained product The elongation rate is significantly improved without affecting its tensile strength, yield strength, hardness and other properties. The medium-carbon low-alloy steel product processed by the process of the invention has high mechanical properties, good plasticity, high elongation rate and section shrinkage rate, stable performance, wear-resistant product surface, good core plasticity and long service life.

Description

technical field [0001] The invention relates to the technical field of casting casting production, in particular to a heat treatment method for medium-carbon low-alloy steel. Background technique [0002] Medium-carbon low-alloy steel has good comprehensive performance, high strength and good wear resistance after water quenching and low-temperature tempering. The crawler-linked excavators produced and assembled are widely used in earthwork operations in energy, transportation, mining, metallurgy and other industries , especially suitable for harsh working sites where wheel loaders cannot operate, and to manufacture various mechanical parts that withstand impact, wear resistance, and high loads. For example, the track link parts of a large excavator, the assembled excavator is operated in an area with a harsh working environment during the specified service period, and the probability of the link track shoe breaking will be greatly reduced. This makes the excavator track li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/28C21D1/26C21D1/18C22C38/02C22C38/04C22C38/44
CPCC21D1/28C21D1/26C21D1/18C22C38/02C22C38/04C22C38/44C21D6/004C21D6/005C21D6/008C21D1/773Y02P10/20
Inventor 叶登权杜应流矫桂霞阮鹏何桂霞
Owner HUSN CASTING ANHUI YINGLIU GROUP
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