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Low-alloy seamless steel pipe for supporting crane cantilever

A technology of seamless steel pipe and crane, applied in the field of seamless steel pipe manufacturing, can solve the problems of high price and unguaranteed delivery time, and achieve the effects of improving quality, easy welding and excellent mechanical properties

Inactive Publication Date: 2012-07-11
TIANJIN PIPE GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cantilever tubes of jacks exported abroad mainly rely on imported seamless tubes, not only the delivery time is not guaranteed, but the price is also very high

Method used

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  • Low-alloy seamless steel pipe for supporting crane cantilever
  • Low-alloy seamless steel pipe for supporting crane cantilever
  • Low-alloy seamless steel pipe for supporting crane cantilever

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Embodiment Construction

[0015] The implementation process of the low-alloy seamless steel pipe used for crane cantilever support is described in conjunction with the examples.

[0016] The low-alloy seamless steel pipe for crane cantilever support of the present invention, the composition design range of the seamless steel pipe is by weight %: C: 0.10-0.20%, Si: 0.2-0.8%, Mn: 0.6-1.5%, Cr: 0.3 -0.8%, Mo: 0.2-0.6%, Ti: 0.001-0.050%, Al: 0.02-0.06%, Ni: 0.2-0.8%, V: 0.01-0.10%, Nb: 0.01-0.08%, and the rest is Fe The metallographic structure of the seamless steel pipe after quenching and tempering treatment is tempered sorbite, and the carbon equivalent is controlled to be Ceq≤0.55;

[0017] The mechanical properties of seamless steel pipes produced according to the above range are:

[0018]

[0019] Take the seamless steel pipe of TP890C specification as an example. At present, the main chemical composition of such products used in the market is based on 20 steel, adding appropriate alloying elemen...

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Abstract

The invention provides a low-alloy seamless steel pipe for supporting a crane cantilever. The seamless steel pipe comprises the following components in percentage by weight: 0.10 to 0.20 percent of C, 0.2 to 0.8 percent of Si, 0.6 to 1.5 percent of Mn, 0.3 to 0.8 percent of Cr, 0.2 to 0.6 percent of Mo, 0.001 to 0.050 percent of Ti, 0.02 to 0.06 percent of Al, 0.2 to 0.8 percent of Ni, 0.01 to 0.10 percent of V, 0.01 to 0.08 percent of Nb and the balance of Fe. The low-alloy seamless steel pipe has the advantages of lower carbon equivalent and the mechanical properties of similar products; a heavy-duty machinery manufacturing enterprise more easily obtains high-quality welded joints on the premise of a welding process, and the production efficiency of on-site welding is improved; and the using amount of precious metal alloy elements such as W, Ni, Mo and the like is reduced, resources are saved, and the production cost of the seamless pipe is reduced.

Description

technical field [0001] The invention belongs to the manufacturing technology of seamless steel pipes used in heavy machinery manufacturing in the metal material industry, and in particular relates to a low-alloy seamless steel pipe used for crane cantilever support. Background technique [0002] my country has a relatively short history of producing crawler cranes. Compared with foreign advanced products such as Terex, Demag, and Manitowoc, there is still a certain gap in design and manufacture. In recent years, domestic crawler cranes have developed rapidly, and the product series have been continuously improved. A full range of products with different models between 35t and 3600t has been developed, and crawler cranes with larger tonnages are also in the development stage. [0003] Crawler cranes are mainly used in petrochemical, petroleum, chemical, energy, steel, large-scale municipal construction and other engineering projects. With the increase of large-scale hoisting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C21D1/25C21D9/08B66C23/78
Inventor 李效华张传友周家祥刘江成张国柱周国帅史庆志周晓锋江勇石超民李毅孙宇梁海泉窦玉如
Owner TIANJIN PIPE GROUP CORP
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