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Method for preparing butt-welding elbow through molding of stainless steel composite steel plate

A composite steel plate and stainless steel technology, which is applied to other manufacturing equipment/tools, welding media, manufacturing tools, etc., can solve the problems of expensive stainless steel, etc., and achieve the effects of easy geometric size, prevention of peeling, and high shear strength

Inactive Publication Date: 2010-12-08
江阴市东发机械设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cost of stainless steel, for some large thick-walled pipes, composite steel plates are often used instead.

Method used

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  • Method for preparing butt-welding elbow through molding of stainless steel composite steel plate
  • Method for preparing butt-welding elbow through molding of stainless steel composite steel plate
  • Method for preparing butt-welding elbow through molding of stainless steel composite steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] (1) Blanking, according to the size of the elbow, select the appropriate steel plate blanking to make a blank;

[0026] (2) Pressing, pressing the blank through the forming die at room temperature or heating several times to reach the elbow forming size; the heating condition is: the blank is placed in a heating furnace for heating, and heated to the range of 930±20℃ Pressing inside; cold pressing process can also be used;

[0027] (3) Welding, select different welding processes for welding according to different materials;

[0028] (4) Heat treatment, normalizing the hot-pressed elbow at 910±10℃; or annealing the cold-pressed elbow at 610±10℃.

[0029] (5) Machining, the rough elbow is processed into a finished elbow.

[0030] (6) Inspection, through its appearance, geometric dimensions, performance inspection and various non-destructive inspections, it becomes a standard finished product.

[0031] Press forming: According to the size of the elbow, select the appropriate steel p...

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Abstract

The invention discloses a method for preparing a butt welding elbow through the molding of a stainless steel composite steel plate, which comprises the steps of: (1) blanking, in which the stainless steel composite plate is selected to perform blanking to prepare into a blank of the elbow according to the size of the elbow; (2) pressing, in which the blank of the elbow is pressed for multiple times at room temperature or under the heating through a mold of the elbow to achieve the molding shape and size of the elbow, and conditions of heated pressing is that the blank is placed into a heatingfurnace for heating and is pressed when heated to the range of 930+ / -20 DEG C; (3) welding, in which different welding technology is selected for welding according to different materials, and weldinglayers of butt welding has three layers, namely a transition layer is added between a basic layer and a compound layer, namely the welding of the stainless steel composite steel plate is performed bythree parts: the welding of the basic layer, the welding of the compound layer, and the welding of the transition layer; and (4) heat treatment, in which the hot-pressed elbow is subjected to normalizing heat treatment with a temperature of 910+ / -10 DEG C, or the cold-pressed elbow is subjected to annealing heat treatment with a temperature of 610+ / -10 DEG C.

Description

1. Technical field [0001] The invention relates to a method for manufacturing a butt welding elbow formed by stainless steel composite steel plate. 2. Background technology [0002] In order to solve the corrosion resistance problem of petroleum, chemical and other equipment, stainless steel is a commonly used material. However, because stainless steel is expensive, some large thick-walled pipes are often made of composite steel plates. [0003] Stainless steel composite steel plate is composed of a thin clad layer and a thick base layer through rolling or explosion methods. The cladding meets the requirements for corrosion resistance, while the base layer uses carbon steel or low alloy steel, which is much lower cost than the cladding, to meet the strength requirements. Due to its good economy, it is widely used in pressure pipe manufacturing in petroleum, chemical and other industries. [0004] Pipe fittings are the main components in the oil and gas, chemical industry,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/00B23K35/22B21J5/00
Inventor 姜丽琴姜才明陆浩良
Owner 江阴市东发机械设备制造有限公司
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