Steel used for quartering hammer piston rods, and thermal treatment method thereof

A technology for a piston rod and a breaker is applied in the field of steel for a breaker piston rod and its heat treatment process, which can solve the problems of low strength, hardness, low fatigue strength, etc.

Active Publication Date: 2017-03-22
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After analysis, the main reason for the fracture is that the strength and hardness of the core of the piston rod are low, and the fatigue strength is low, which leads to abnormal fracture during use.

Method used

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  • Steel used for quartering hammer piston rods, and thermal treatment method thereof
  • Steel used for quartering hammer piston rods, and thermal treatment method thereof
  • Steel used for quartering hammer piston rods, and thermal treatment method thereof

Examples

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Embodiment Construction

[0030] The technical solutions of the present invention will be further described below in conjunction with the examples.

[0031] The chemical composition (smelting analysis, the rest is Fe and unavoidable impurity elements) of the steel for the piston rod of the breaking hammer of Examples 1-10 is shown in Table 1

[0032] Table 1

[0033]

[0034] See 2 for the heat treatment process of the steel for the piston rod of the breaking hammer in Examples 1-10:

[0035] Table 2

[0036]

[0037]

[0038] The steel produced in Examples 1-10 was used as a piston rod and delivered for use. There was no deformation of the piston rod, diameter expansion, damage to the cylinder body, and no breakage, which met the requirements for the use of the breaker.

[0039] The steel breaker piston rod produced by the application is compared with the usage of 40CrNiMoA steel and GCr15 steel in the prior art, as shown in Table 3 below:

[0040]

[0041] In conjunction with the above...

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Abstract

The invention provides a steel used for quartering hammer piston rods, and a thermal treatment method thereof. The steel comprises following ingredients, by weight, 0.85 to 0.95% of C, 0.15 to 0.40% of Si, 0.46 to 0.80% of Mn, P<=0.025%, S<=0.025%, 1.71 to 2.10% of Cr, 0 to 0.15% of Mo, and the balance Fe and inevitable impurity elements. The thermal treatment method is adopted to prepare the steel. The quartering hammer piston rods prepared from the steel possesses following advantages, compared with quartering hammer piston rods prepared via the prior art, the high cost of conventional 40CrNiMoa steel piston rods is avoided, occasionally caused piston rod deformation, diameter increasing, and cylinder damage are avoided, breakage of conventional GCr15 steel piston rods easily caused in applications is reduced greatly, and breakage rate in applications is lower than 0.3%.

Description

technical field [0001] The invention belongs to the field of steel for industrial and mining machinery, in particular to a steel for a piston rod of a breaking hammer and a heat treatment process thereof. Background technique [0002] The piston rod of the breaking hammer of construction machinery and mining machinery is subjected to huge impact force when it is working, and the piston rod is required to have high strength, good toughness, high wear resistance and high fatigue resistance. [0003] In the prior art, the piston rod of the breaking hammer is generally made of 40CrNiMoA steel. The chemical composition (weight percentage) range of 40CrNiMoA steel in the national standard GB / T 3077-1999 "Alloy Structural Steel" is C 0.37-0.44%, Si0.17- 0.37%, Mn0.50-0.80%, Cr0.60-0.90%, Mo0.15-0.25%, Ni1.25-1.65%, P≤0.025%, S≤0.025%, Cu≤0.25%, the rest is iron and impurity elements. In the process of processing the piston rod with 40CrNiMoA steel, it undergoes annealing + quench...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/12C21D6/00
CPCC21D6/002C21D6/005C21D6/008C22C38/02C22C38/04C22C38/12C22C38/18
Inventor 完颜卫国
Owner MAGANG (GROUP) HOLDING CO LTD
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