Pipeline steel welding, heat treatment and rolling integral forming method
A forming method and pipeline steel technology, which is applied in the field of pipeline steel forming, can solve problems such as foaming, shrinkage, and cracks, and achieve the effects of shortening the process route, increasing productivity, and improving forming quality
Active Publication Date: 2021-09-24
CHONGQING TECH & BUSINESS UNIV
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Problems solved by technology
[0004] In view of this, the present invention provides a pipeline steel welding, heat treatment and rolling integrated forming method to solve the existing technology, which is prone to produce manufacturing defects such as foaming, shrinkage porosity, and cracks in the subsequent processing procedures of pipeline steel question
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[0030] The present invention will be further described below in conjunction with embodiment and accompanying drawing.
[0031] Such as figure 1 As shown, a pipeline steel welding, heat treatment and rolling integrated forming method includes the following forming steps:
[0032] Step 1: using friction welding to weld the two sections of the base material a into an integrated rough embryo pipeline steel c;
[0033] Step 2: Grinding the weld d;
[0034] Step 3: Use the high-frequency heating box 5 to heat the welded joint and cool it naturally;
[0035] Step 4: using the rolling unit 3 to sequentially perform rough rolling, 930° finish rolling, 800° finish rolling and final rolling on the rough embryo pipeline steel c.
[0036] Such as figure 2 As shown, the assembly line suitable for the above pipeline steel forming method includes: a welding device 1, a bracket group 2, a grinder 4, a high-frequency heating box 5 and four sets of rolling units 3 arranged in sequence along...
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Abstract
The invention discloses a pipeline steel welding, heat treatment and rolling integral forming method, which includes two sections of base material and the following forming steps: Step 1: adopt friction welding to weld the two sections of the base material into one rough embryo pipeline Steel; Step 2: Grinding the weld seam; Step 3: Heating the welded joint and cooling it naturally; Step 4: Using a rolling mill to sequentially perform rough rolling, finish rolling and final rolling on the rough embryo pipeline steel. The beneficial effect of the present invention is: the base metal is connected by friction welding, and heat treatment is adopted for the welding area, the consistency of the fusion zone and the heat affected zone after welding and the structure of the base metal is better, so that after rolling, each The grain size of the area tends to be consistent, and there will be no manufacturing defects such as blistering, shrinkage porosity, and cracks at the weld position, which significantly improves the forming quality of pipeline steel.
Description
technical field [0001] The invention relates to a pipeline steel forming method, in particular to a pipeline steel welding, heat treatment and rolling integral forming method. Background technique [0002] Pipeline steel is the most typical type of steel among microalloy steels. Specifically, it refers to a type of steel with special requirements used in pipelines for transporting oil and natural gas. It is produced by a steel coil rolling mill or a medium and heavy plate rolling mill, and is formed into a large-diameter steel pipe by spiral welding or UOE straight seam welding. [0003] In the forming process of pipeline steel, the rolling process is the most widely used. In the existing technology, the principle of process dispersion is generally adopted in the rolling of pipeline steel to arrange the assembly line. However, there are many defects in the current welding method, which will have an adverse impact on the subsequent production process of pipeline steel; some ...
Claims
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IPC IPC(8): B23P15/00B23K20/12C21D9/50B21B3/00B21B37/74B21B37/78B21C37/08
CPCB21B3/00B21B37/74B21B37/78B21C37/08B23K20/122B23P15/00C21D9/50
Inventor 梁强王敬
Owner CHONGQING TECH & BUSINESS UNIV