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How to deal with deformation of stainless steel storage tank


Release time:

2019-06-04

Some friends will find that the stainless steel tank has been deformed, what can be done? Take a look at how to deal with the deformation of the stainless steel tank. Stainless steel storage tank deformation 1, carbon structural steel in the ambient temperature below 1690, low alloy structural steel in the ambient temperature below 12 ℃, shall not be cold straightening. 2, carbon structural steel and low alloy structural steel in the heating correction, the heating temperature should be selected according to the performance of the steel, but not more than 90090. Low alloy steel should be cooled slowly after heating and correction. 3. When the deformation of the component is not large, cold processing correction and hot processing correction can be used; when the deformation is large and

   Some friends will find that the stainless steel tank has been deformed, what can be done? Take a look at how to deal with the deformation of the stainless steel tank.

Stainless steel tank deformation

1, carbon structural steel in the ambient temperature below a 1690, low alloy structural steel in the ambient temperature below a 12 ℃, shall not be cold correction.

2, carbon structural steel and low alloy structural steel in the heating correction, the heating temperature should be selected according to the performance of the steel, but not more than 90090. Low alloy steel should be cooled slowly after heating and correction.

3, when the deformation of the component is not large, cold processing correction and hot processing correction can be used; when the deformation is large and difficult to correct, it should be reinforced or replaced with new parts for repair.

4. The allowable deviation of steel after correction shall meet the requirements.

5. The allowable deviation value of the external dimension of the steel member shall meet the requirements.

Deformation Accident Treatment Method

Correction of deformation by 1. cold working

The cold working method is to correct the deformation by human or mechanical force, and is suitable for components with small size or small deformation.

① Manual correction

Using a sledgehammer and a platform as a tool, it is suitable for local deformation correction of smaller parts, and can also be used as an auxiliary correction method for mechanical correction and thermal correction. Manual correction is to use hammering to extend the metal to achieve the purpose of correcting deformation. It is a method of correcting deformation by hand.

A. The steel plate is placed on the platform with the convex surface upward. The medium and heavy plate can be corrected by hitting the convex surface with large hammers. The thin plate shall be centered on the convex surface, from far to near, from heavy to light, hitting the convex surface around the plate to gradually smooth the plate and finally hitting the convex surface slightly;

B. The parts shall be placed on the platform, and the raised part shall be hammered at an appropriate distance. The hammering shall be carried out over and over again, with the impact force from small to large;

C. Place the wrinkled parts on the platform, draw a grid line at both ends of the bow, and hammer from the outside to the inside, from heavy to light, from dense to thin according to the grid. The hammering point should be plum blossom-shaped;

D. Place the twisted slats on the platform, hammer the edge of the outer side plate of the support point with a hammer, blow from 1 to 2, and after general correction, correct the unevenness on the platform;

E.T-shaped steel and channel steel are bent and deformed. Hammer them when they see protrusions. It is necessary to master the distance of supporting points, the position and weight of hammering points. The focus is on hammering "protruding ribs".

② Mechanical correction

Simple bows, jacks and various machinery are used to correct the deformation. Table 4.10 shows several methods of mechanical correction of deformation and their scope of application.

The cold working correction method must be that the rod and plate are free of cracks, notches and other damages, the mechanical force should be gradually increased, and the pressure should be maintained for a period of time after the deformation disappears.

Correction of deformation of stainless steel storage tank by 2. hot working method

At present, acetylene gas and oxygen mixed combustion flame is used as heat source to heat the deformed structural components of stainless steel storage tank to produce new deformation to offset the original deformation. The correct use of flame and temperature is the key. The heating method is divided into point heating, linear heating line, curve, loop line, parallel line, mesh line and triangle heating.

According to the actual situation, the thermal correction method should first understand the deformation, analyze the causes of deformation, measure the size of deformation, and know fairly well. Secondly, the correction sequence is determined. In principle, the overall deformation correction is first followed by local deformation correction. Angular deformation is often corrected first, while concave-convex deformation is often corrected later. The third is to determine the heating part and method. The heating effect is better by several workers at the same time. Some deformations are difficult to be corrected by heat alone. The appropriate part can be pulled, pressed, supported, pushed and beaten by external force of auxiliary tools. The heating position should avoid key parts as much as possible to avoid repeated heating at the same position; finally select the appropriate flame and heating temperature. After correction, the components shall be trimmed and inspected.

A. plate concave-convex deformation: concave-convex deformation range is small, can be corrected by point heating; concave-convex deformation range is large, with linear parallel lines or mesh heating correction. The correction sequence is carried out symmetrically from around the convex surface to the center of the convex surface, and can be operated by several workers at the same time when the range is large.

B. wrinkle deformation: the deformation is small, can be heated in parallel line mode. The deformation is large, and it should be heated in a triangular manner. Two ways of comprehensive correction effect is better. Both parallel and triangular heating should start on both sides of the bulge and wrap around the highest point. Parallel line width 15-20mm, line spacing 80mm; Triangles usually have a vertex angle of 300mm, a waist length of 80mm, and left and right isosceles triangles. Generally, 1 to 3 triangles are appropriate within Im.

C. angular deformation: linear heating is used at the corresponding positions between the convex surface of the flange plate and the weld seam, with a line width of 0.5-2t and a heating depth of 12-13tt, which is the thickness of the flange plate.

D. bending deformation: thick plate bending can be linearly heated near the highest point of the convex surface, which cannot be corrected at one time, and then heated near both sides, with the heating depth displaced at the same angle; Steel pipe bending is heated in a point shape at the convex part, and the heating movement should be rapid. If one correction cannot be made, it can be heated again, but the position of the heating point is staggered with the previous secondary part, and the heating depth is equal to the wall thickness of the wall. Section steel bending, the bottom edge of the triangle is on the edge, the heating depth is the thickness of the flange, and the height of the triangle is 15-2 of the width of the section steel. The box-shaped component is bent on the upper cover plate for linear heating, the heating depth is equal to the thickness of the cover plate, and the line width is 2 times the thickness of the plate.

E. Twisting deformation: the slat is twisted and deformed. Place it on the platform and heat it linearly on the convex surface. The clamping angle between the heating line and the long side of the slat is 450. The width of the heating line is generally 1-2 times of the thickness of the slat and the depth is 12-23 of the thickness of the plate. Heating starts from the middle of the slat to both ends. If there is still residual bending deformation after correction, triangle heating, bending correction, place it on the platform, heat it linearly on the outer side of the two webs, from both ends to the middle, the width and depth of the heating line are the same as above, and then heat and correct it linearly on the outer side of the two cover plates.

The above is the introduction of stainless steel tank deformation, hoping to help you.