CN115389345A - Processing Method of Shearing Specimen of Extra Thick Composite Steel Plate of the Same Material - Google Patents

Abstract

The invention relates to a processing method of a shearing sample of an ultra-thick composite steel plate made of the same material, which comprises the following steps of 1) intercepting a full-thickness sample on the ultra-thick composite steel plate, wherein the length direction of the sample is parallel to the rolling direction of the steel plate; 2) Placing the sample in acid liquor, heating to 20-30 ℃, etching for 20-30min, taking out, cleaning and drying; a continuous line appears on a composite interface of a sample, and the continuous line is a combined surface of the super-thick composite plate; 3) The continuous line was used as a center line, and a shear specimen was processed according to the standard. The method can quickly determine the composite interface and realize the accuracy of the shearing test of the same material.

Description

Processing Method of Shearing Specimen of Extra Thick Composite Steel Plate of the Same Material

technical field

The invention relates to a shear test, in particular to a method for processing a shear sample of an extra-thick composite steel plate of the same material.

Background technique

Extra-thick plates are rolled together by two steel plates using a special composite technology. The quality of the combination is usually evaluated by non-destructive ultrasonic flaw detection and shear test. Experiment to evaluate how well it binds. However, the current shear test usually adopts the standard "GB/T 6396-2008 Test Method for Mechanics and Technological Properties of Clad Steel Plates", but this method is mainly for the evaluation of shear strength between dissimilar metals, and for the special properties formed by rolling the same metal. There are serious defects in the evaluation of thick steel plates (above 100mm), because the position of the composite interface cannot be determined, so this method cannot be used for processing and testing of shear samples.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for processing a shear sample of an extra-thick composite steel plate of the same material, which can quickly confirm the interface of an extra-thick composite steel plate of the same material, and is simple and easy to operate.

To achieve the above object, the present invention adopts the following technical solutions:

A method for processing a shear sample of an extra-thick composite steel plate of the same material comprises the following steps:

1) Take a full-thickness sample on an extra-thick composite steel plate, the length of the sample is L=80-100mm, and the length direction is parallel to the rolling direction of the steel plate; the width of the sample is W=25-35mm.

2) Place the sample in the acid solution, heat it to 20°C-30°C, etch it for 20-30 minutes, take it out, clean it and dry it; a continuous line will appear on the composite interface of the sample, which is the characteristic Joint surface of thick composite board;

3) Take the continuous line as the center line, and process it into a shear sample according to the standard.

The acid solution in step 2) is a hydrochloric acid solution with a concentration of 40%-60%.

Step 2) Clean with tap water or alcohol.

The surface roughness of the processed sample described in step 3) is Ra≤2.0um.

Compared with prior art, the beneficial effect of the present invention is:

In the invention, a large full-thickness sample is intercepted on an extra-thick composite steel plate, and hot-acid erosion is performed on it, so that the composite interface can be quickly determined, and the sample processing of the extra-thick composite steel plate can be performed. Simple and easy to operate, to achieve the accuracy of the same material shear test. The test cost is low.

Description of drawings

Figure 1 is a schematic diagram of the sample.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The processing method of the shear sample of the extra-thick composite steel plate of the same material is to cut a full-thickness sample on the extra-thick composite steel plate and perform hot acid etching on it. Include the following steps:

1) Cut the sample on the extra-thick composite steel plate, the length of the sample is L=80-100mm, and the direction is parallel to the rolling direction of the steel plate; the width of the sample is W=25-35mm; the roughness of the processed surface of the sample is Ra≤2.0um.

2) Place the sample in an acid solution, which is a hydrochloric acid solution with a concentration of 40%-60%; heat it to 20°C-30°C, etch it for 20-30min, take it out and clean it with tap water or alcohol and dry it; Due to the potential difference between the two blanks used for compounding, corrosion is more likely to occur at the interface under the acid solution, and a continuous line will appear on the composite interface of the sample (see A in Figure 1), which is the extra-thickness The joint surface of the composite board;

3) Take the continuous line as the center line, and process it into a shear sample according to the GB/T 6396 standard.

Example 1:

Processing of shear samples of extra-thick composite steel plate with material Q345B and thickness 100mm:

1. A large sample of H(100mm)×L(100mm)×W(35mm) is cut from the clad steel plate, where H is the thickness of the clad steel plate, L is the dimension in the rolling direction of the steel plate, W is the dimension in the width direction of the steel plate, Surface roughness Ra=2.0um; where the sample length L is parallel to the rolling direction of the steel plate;

2. Place the sample in 60% hydrochloric acid solution, heat to 30°C, etch for 30 minutes, take it out, clean the sample with tap water and dry it. A thin line A visible to the naked eye appears on the composite interface of the sample (due to the potential difference between the two blanks, corrosion occurred under the corrosive liquid), and this thin line is the bonding surface of the extra-thick composite plate;

3. With the thin line A as the center line, according to the GB/T 6396 standard, it is processed into a shear sample by wire cutting equipment, and the test result is good.

Example 2:

Processing of shear samples of extra-thick composite steel plate with material Q345D and thickness 120mm:

1. Cut a large sample of H(120mm)×L(80mm)×W(25mm) on the extra-thick clad steel plate, where H is the thickness of the clad steel plate, L is the dimension in the rolling direction of the steel plate, and W is the width of the steel plate Direction dimension, surface roughness Ra=1.8um; wherein the sample length (L) is parallel to the rolling direction of the steel plate; the schematic diagram of sampling is shown in Figure 1.

2. Place the sample in 40% hydrochloric acid solution, heat to 20°C, etch for 20 minutes, take it out, clean the sample with tap water or alcohol, and dry it. A thin line A visible to the naked eye appears on the composite interface of the sample (due to the potential difference between the two blanks, corrosion occurred under the corrosive liquid), this thin line is the joint surface of the extra-thick composite plate, and then the thin line A If A is the center line, it can be processed into a shear sample according to the GB/T 6396 standard.

3. With the thin line A as the center line, according to the GB/T 6396 standard, the wire cutting equipment was successfully processed into a shear sample, and the inspection result was good.

Example 3:

Processing of shear samples of extra-thick composite steel plate with material Q235B and thickness 200mm:

1. Cut a large sample of H(200mm)×L(90mm)×W(30mm) on the extra-thick clad steel plate, where H is the thickness of the clad steel plate, L is the dimension in the rolling direction of the steel plate, and W is the width of the steel plate Directional dimensions, surface roughness Ra≤1.5um; the length L of the sample is parallel to the rolling direction of the steel plate; the schematic diagram of sampling is shown in Figure 1.

2. Place the sample in 50% hydrochloric acid solution, heat to 25°C, etch for 25 minutes, take it out, clean the sample with tap water or alcohol, and dry it. A thin line A visible to the naked eye appears on the composite interface of the sample (due to the potential difference between the two blanks, corrosion occurred under the corrosive liquid), this thin line is the joint surface of the extra-thick composite plate, and then the thin line A If A is the center line, it can be processed into a shear sample according to the GB/T 6396 standard.

3. With the thin line A as the center line, according to the GB/T 6396 standard, the wire cutting equipment was successfully processed into a shear sample, and the inspection result was good.

Although the implementation examples of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and basic spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (5)

1. The processing method of the shearing test sample of the super-thick composite steel plate made of the same material is characterized by comprising the following steps of:

1) Intercepting a full-thickness sample on the super-thick composite steel plate, wherein the length direction of the sample is parallel to the rolling direction of the steel plate;

2) Placing the sample in acid liquor, heating to 20-30 ℃, etching for 20-30min, taking out, cleaning and drying; corroding a continuous line on the composite interface of the sample, wherein the continuous line is the joint surface of the super-thick composite plate;

3) The continuous line was used as a center line, and a shear specimen was processed according to the standard.

2. The method for processing the shearing test sample of the extra-thick clad steel plate made of the same material as the claim 1, wherein the length of the test sample in the step 1) is 80-100mm, and the width of the test sample is 25-35mm.

3. The method for processing the sheared sample of the extra-thick composite steel plate made of the same material as the claim 1, wherein the acid solution in the step 2) is a hydrochloric acid solution with the concentration of 40% -60%.

4. The method for processing the sheared sample of the extra-thick clad steel plate made of the same material as that of the claim 1, wherein the step 2) is performed by washing with tap water or alcohol.

5. The method for processing the shearing sample of the special thick clad steel plate made of the same material as the claim 1, wherein the sample processing surface roughness Ra of the step 3) is less than or equal to 2.0um.

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