Pipeline steel welding, heat treatment and rolling integrated forming method
A forming method and pipeline steel technology, applied in the field of pipeline steel forming, can solve problems such as foaming, cracks, and shrinkage porosity, and achieve the effects of shortening the process route, increasing productivity, and improving forming quality
Active Publication Date: 2020-08-25
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 integrated forming method. Two sections of base metal are included, and the pipeline steel welding, heat treatment and rolling integrated forming method comprises the steps that step 1, a friction welding method is used for welding the two sections of the base metal into integrated raw material pipeline steel; step 2, a welding seam is ground; step 3, a welding joint is heated and naturally cooled; and step 4, a rolling mill is used for sequentially performing rough rolling, finishing rolling and finish rolling on theraw material pipeline steel. The pipeline steel welding, heat treatment and rolling integrated forming method has the beneficial effects that the base metal is connected by the friction welding method, and heat treatment is applied to the welding area, and a fusion zone after welding, a heat-affected zone are more consistent with the structure of the base metal, so that the grain size of the zones tends to be the same after rolling, and no manufacturing defects such as blistering, shrinkage and cracks exist in the welding seam position, and the forming quality of the pipeline steel is significantly improved.
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