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A crane jib containing tantalum

A crane and cantilever technology, applied in the field of tantalum-containing crane cantilevers, can solve the problems of increased process and cost, large residual stress of steel plates, etc., and achieves the effects of good mechanical properties and good tensile strength

Inactive Publication Date: 2017-07-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main issues that need to be considered are: making the crane jib have the required microstructure, selecting alloy elements suitable for the crane jib, and taking into account the cost issue; in view of the special purpose of the crane jib, the impurity content must be strictly controlled; and in the heat treatment process , the residual stress in the steel plate is large, which leads to the problem of plate shape, and also increases the process and cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A crane jib containing tantalum, the steel element composition of the crane jib includes tantalum element, and the crane jib has an inner and outer double-layer structure, the outer structure is a bainite structure, and the inner structure is covered by the outer Wrapped by a layer structure, the inner layer structure has a pearlite structure. The steel element composition of the crane cantilever is calculated by weight percentage: 0.25% of C, 0.15% of Si, 1.20% of Mn, 1.20% of Ta, 0.10% of Ti, 0.0001% of B, 0.05% of V, no More than 0.001% of S, not more than 0.001% of P, not more than 0.10% of Cu, not more than 0.10% of Mo, and the balance is iron and unavoidable impurities. The heat treatment process of the crane cantilever is as follows: a. Heating the billet to 1100°C at a heating rate of 10°C / min and keeping it warm for 120 minutes; b. Using the forming process to form the billet into a crane cantilever; c. The crane jib is subjected to austempering treatment at 3...

Embodiment 2

[0015] A crane jib containing tantalum, the steel element composition of the crane jib includes tantalum element, and the crane jib has an inner and outer double-layer structure, the outer structure is a bainite structure, and the inner structure is covered by the outer Wrapped by a layer structure, the inner layer structure has a pearlite structure. The steel element composition of the crane cantilever is calculated by weight percentage: 0.23% of C, 0.10% of Si, 1.20% of Mn, 1.50% of Ta, 0.20% of Ti, 0.001% of B, 0.05% of V, no More than 0.001% of S, not more than 0.001% of P, not more than 0.10% of Cu, not more than 0.10% of Mo, and the balance is iron and unavoidable impurities. The heat treatment process of the crane cantilever is as follows: a. Heating the steel billet to 1000 °C at a heating rate of 12 °C / min and keeping it warm for 100 minutes; b. Using the forming process to form the steel billet into a crane cantilever; c. The cantilever of the crane is subjected to ...

Embodiment 3

[0017] A crane jib containing tantalum, the steel element composition of the crane jib includes tantalum element, and the crane jib has an inner and outer double-layer structure, the outer structure is a bainite structure, and the inner structure is covered by the outer Wrapped by a layer structure, the inner layer structure has a pearlite structure. The steel element composition of the crane cantilever is calculated by weight percentage: 0.25% of C, 0.15% of Si, 1.20% of Mn, 1.40% of Ta, 0.20% of Ti, 0.0001% of B, 0.04% of V, no More than 0.001% of S, not more than 0.001% of P, not more than 0.10% of Cu, not more than 0.10% of Mo, and the balance is iron and unavoidable impurities. The heat treatment process of the crane cantilever is as follows: a. Heating the steel billet to 1050 °C at a heating rate of 11 °C / min and keeping it warm for 60 minutes; b. Using the forming process to form the steel billet into a crane cantilever; c. The cantilever of the crane is subjected to ...

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Abstract

The invention discloses a tantalum-containing crane cantilever. Through the inner and outer double-layer structure of the crane cantilever, at the same time, selecting suitable alloy elements, especially tantalum element, as a beneficial alloying element is introduced into the crane cantilever, thereby ensuring that the crane cantilever has a good Excellent tensile strength, and the cost is controlled within a reasonable range, so that the crane cantilever maintains good mechanical properties in practical applications.

Description

technical field [0001] The invention relates to the field of cranes, in particular to a tantalum-containing crane cantilever. Background technique [0002] Crane refers to a device that hangs heavy objects with hooks or other fetching devices. According to the structure, it can be divided into three categories: bridge type crane, cable type crane and jib type crane. There are five categories of cranes, climbing cranes, portable cranes, radial slewing cranes, and walking cranes. According to the driving mode, they can be divided into three categories: manual cranes, electric cranes, and hydraulic cranes. There are also classifications according to slewing capacity, support mode, operation mode, etc. In the prior art, the basic structures of high-strength steel plates with tensile strengths of 950 MPa and 1180 MPa are tempered martensite and lower beinite. In order to achieve high strength of steel, in addition to controlling the structure of steel, strengthening mechanisms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C21D9/00B66C23/64
Inventor 王龙庭王斌汪海王言哲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)