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Q460C steel welding process

A welding process and welding zone technology, which is applied in the welding process field of Q460C steel in GB1591-2008, can solve the problems of reduced toughness, long residence time at high temperature, and weakened effect of microstructure, so as to reduce welding deformation and welding stress , the effect of preventing excessive grain size

Inactive Publication Date: 2015-06-17
JIANGSU HONGGUANG STEEL POLE
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Problems solved by technology

[0006] The heat-affected zone of Q460C steel will undergo an embrittlement process during the welding process, in which the precipitated phases of carbon and nitrogen compounds formed by vanadium, niobium, and carbon and nitrogen dissolve into the phase to resist the growth of austenite, but in the heat-affected zone In the coarse-grained area, the residence time at high temperature is long, and the effect of refining the structure is greatly weakened. In the coarse-grained area, coarse grains and upper bainite, M-A components, and the increase in the solid solubility of carbon and nitrogen in the coarse-grained area , leading to a decrease in toughness and an increase in aging sensitivity

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  • Q460C steel welding process

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0039] The welding process of a kind of Q460C steel described in the present invention adopts argon / carbon dioxide fine mixed gas shielded welding to carry out bottom welding, adopts argon / carbon dioxide mixed gas shielded welding to carry out filling and cover welding, and operates according to the following steps:

[0040] The present invention carries out rigorous and detailed design on the process, and provides normative process operation guidance for the welding of Q460C steel.

[0041] (1) Determination of welding process parameters

[0042] Since Q460C contains more alloying elements, the hardening of this type of steel increases. As the carbon equivalent and plate thickness of the steel increase, the tendency of hardening and cold cracking increases, and under the action of high stress, The tendency to produce welding cracks is also greatly...

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Abstract

The invention relates to a Q460C steel welding process. Argon / carbon dioxide refined mixed gas shielded welding serves as bottom welding, and argon / carbon dioxide mixed gas shielded welding serves as filling cosmetic welding. By the adoption of the Q460C steel welding process, a quenched structure can be prevented from being produced during steel pipe welding, structural grains can be prevented from being too large, welding stress can be reduced, and welding deformation can be decreased.

Description

technical field [0001] The invention relates to steel welding technology, in particular to a welding process for Q460C steel specified in GB1591-2008. Background technique [0002] With the development of the power industry and the improvement of steel industry technology, the performance of high-strength steel is becoming more and more mature, and the production capacity has been greatly increased. In many projects, it can be greatly superior to ordinary low-alloy steel such as Q235 and Q345 in terms of economic efficiency and design. But high-strength steel also increases the difficulty of forming and welding. Comprehensive advantages and disadvantages, high-strength steel has broad development prospects and application space. [0003] Q460C yield strength R eL is 460MPa, and the tensile strength Rm is 550-720MPa. [0004] Q460C low-alloy high-strength steel is based on 16Mn steel. In order to improve the performance of the steel, some alloy elements such as Cr, Ni, V, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/23B23K9/235
CPCB23K9/16B23K9/23B23K9/235B23K2103/04
Inventor 赵津岳鹏
Owner JIANGSU HONGGUANG STEEL POLE
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