Method for manufacturing butt welding pipe cap by shaping thermoformed composite stainless steel plate
A composite steel plate and stainless steel technology, applied in the direction of metal processing equipment, etc., can solve the problem of expensive stainless steel, and achieve the effect of good quality and high yield
Inactive Publication Date: 2009-09-30
江阴市东发机械设备制造有限公司
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Problems solved by technology
However, due to the high cost of stainless steel, for some large pipes, composite steel plates are often used to make them
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[0015] Composite steel pipe cap thermoforming, there is no mature experience at present, the key is that the heating temperature is difficult to control. It is necessary to ensure the mechanical properties of the base layer and the corrosion resistance of the cladding layer. The heating temperature of the base layer must be in the original normalizing state, and the sensitization of the cladding layer must be prevented during the heating process, because the sensitized material is prone to intergranular corrosion. The heating temperature of the hot-pressed pipe cap should be higher than the sensitization temperature of the composite layer (538-850°C), and should not exceed the normalizing temperature of the base layer (900-950°C). In view of this, the present invention sets the initial pressure temperature of the hot-pressed composite steel pipe cap at 920-940°C, and strictly controls the final pressure temperature so that it is not lower than 850°C when it is released. In or...
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Abstract
The invention relates to a method for manufacturing a butt welding pipe cap by shaping a thermoformed composite stainless steel plate, comprising the following steps: selecting the composite stainless steel plate according to the specification and the size of the pipe cap and blanking the composite stainless steel plate into pipe cap blank; carrying out ultrasonic inspection and surface seepage inspection to the pipe cap blank before pressing the pipe cap blank; carrying out cold pressing to the pipe cap blank so that the pipe cap blank is pressed by 23-43 percent of the depth of the curved surface of the pipe cap and cleaning the surface of a composite stainless steel plate layer; evenly coating anti-oxidizing coating with a thickness of 0.2-0.3 mm on the surface of the composite stainless steel plate layer; thermoforming the pipe cap blank in a mould by a pressing machine at an initial temperature of 920-940 DEG C and a final pressure temperature of not less than 850 DEG C for demoulding; to avoid the bonding strength of the composite layer and the basal layer of the composite stainless steel plate and the corrosion resistance of the composite layer decreasing, the temperature preservation time in a furnace is controlled within 20 min, the reheating times are controlled within two times and a workpiece needs to be heated or cooled rapidly at 538-850 DEG C.
Description
1. Technical field [0001] The invention relates to a method for manufacturing a butt-welded pipe cap formed from a stainless steel clad steel plate. 2. Background technology [0002] In order to solve the corrosion resistance problem of petroleum, chemical and other equipment, stainless steel is often used as a material. However, due to the high cost of stainless steel, composite steel plates are often used for some large pipes. Stainless steel clad steel plate is a commonly used material. Composite panels made of many alloys have appeared, such as the zirconium-steel composite panel of CN200720034357. [0003] Stainless steel clad steel plate is composed of thinner cladding layer and thicker base layer by rolling or explosion. Among them, the composite layer meets the requirements of corrosion resistance, while the base layer uses carbon steel or low-alloy steel with a much lower cost than the composite layer to meet the strength requirements. Due to its good economy, i...
Claims
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IPC IPC(8): B21J5/00
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