Excavator track steel BG45MnCrB and preparation method thereof

An excavator and crawler technology, which is applied in the field of excavator crawler steel BG45MnCrB and its preparation, can solve problems such as easy oxidation and burning, and achieve the effects of ensuring uniformity, reducing alloy costs, and reducing burning factors.

Inactive Publication Date: 2020-03-24
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, boron is a very active non-metallic element with a strong affinity with oxygen. When it is added in the smelting process, it is easy to oxidize and burn.

Method used

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  • Excavator track steel BG45MnCrB and preparation method thereof
  • Excavator track steel BG45MnCrB and preparation method thereof
  • Excavator track steel BG45MnCrB and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Chemical Composition Design

[0025] The hardenability of steel refers to the ability of the steel to obtain the depth of the hardened layer (martensite layer) when quenched under certain conditions, which is mainly related to the stability of the supercooled austenite of the steel and the critical cooling rate of the steel.

[0026] Common elements that improve hardenability include C, Mn, Cr, Ni, Mo, B, and W; among them, the element C has the greatest influence, and it has a critical point, when the carbon content is greater than 1.2%. , the cooling rate of the steel increases, the C curve shifts to the left, and the hardenability decreases. When the carbon content is less than 1.2%, as the carbon concentration in the steel increases, the cooling rate also decreases significantly, then the C curve shifts to the right, and the hardenability of the steel increases.

[0027] a. In order to ensure the toughness and surface hardness of the track steel core, the end harde...

Embodiment 2

[0049] The excavator track steel BG45MnCrB prepared in the manner of Example 1 is characterized as follows:

[0050] (1) Low-magnification tissue

[0051] General loose loose center Ingot shape segregation center segregation 0.5 0.5 0.5 0 0.5 0.5 0.5 0

[0052] (2) Non-metallic inclusions

[0053] A rough A fine B thick B thin C thick C thin D thick 1.0 1.0 0.5 0.5 0 0 0

[0054] (3) Grain size

[0055] The grain size grades are all grade 7, and there is no mixed crystal phenomenon.

[0056] (4) Decarburization layer

[0057] Decarburization layer depth is 0.3mm.

[0058] (5) End hardenability

[0059] (6) The chemical composition adopts narrow composition control to ensure that the qualified rate of hardenability at the end of the steel reaches 100%, the fatigue life is long, the wear resistance is good, and it is easy for customers to process and use.

[0060] (7) Physical chemical composition %: C:...

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Abstract

The invention belongs to the technical field of steel manufacturing and relates to excavator track steel BG45MnCrB and a preparation method thereof. The excavator track steel BG45MnCrB is produced byadopting a 180t converter+LF+RH+350*470 rectangular blank+ 800 continuous rolling process, the high-density and high-purity excavator track steel smelting technology is achieved, and the steel purityis effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of iron and steel manufacturing, and relates to excavator track steel BG45MnCrB and a preparation method thereof. Background technique [0002] With the rapid development of industries in various countries, the demand for excavators in various industries continues to increase, and the technical requirements for excavator track steel continue to increase. The working environment of excavator track is harsh, and the comprehensive performance requirements for track steel such as wear resistance and fatigue life are very high. strict. In order to improve the hardenability of track steel and consider the cost issue, boron addition treatment is carried out. Boron can improve the hardenability of steel. Just adding 0.001% boron to steel can double the hardenability of steel. At the same time, boron is a very active non-metallic element with a strong affinity with oxygen. When it is added in the smelting process, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/32C22C38/02C22C38/06C22C33/06C21C7/10C21C7/076C21D8/02
CPCC21C7/076C21C7/10C21D8/0226C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/32Y02P10/20
Inventor 张群阚开齐峰王德勇孙忠斌张涛赵建成
Owner BENGANG STEEL PLATES
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