Quality inspection standard for stainless steel products


Quality inspection standard for stainless steel products

Stainless steel product tube

It is widely used in bathroom furniture, such as towel racks, towel rings, faucet water pipes, etc., all

Essence So in the bathroom furniture, because the environment of the bathroom is relatively humid, the customer is more concerned about the quality of the pipe, focusing on whether the stainless steel pipe will be corroded. Let’s take a look today

Quality inspection standards, what is the inspection criteria on the surface of the pipe surface.

1 Scope

This standard specifies the assessment method of decorative and protective metals and test parts or test parts in the corrosive environment or exposure to other purposes in the corrosive environment.

The method specified in this standard is suitable for test boards or test parts exposed under dynamic or static conditions in natural atmosphere, and also applies to test boards or test parts that accelerate tests.

2. Checking method

The main surface of the test is made by drawing a pattern or a proper marker.

Before conducting environmental tests, it is necessary to find out some of the materials existing in some aspects and make records.

If prefabricated injuries on the surface, this damage should be recorded before the test and reported truthfully. If you intentionally deform the sample, rating a separate deformation area separately.


The sample can be checked on the exposure rack, or it can be moved to a more suitable part. Check the time of time to be as uniform as possible, avoid direct reflection of the sun or the cover of the clouds, and check from different perspectives to ensure that the defects are fully manifested.

After the test is over, if the sample status allows, it can be checked without washing. If the dirt and salt sediment are covered with the defects and make the inspection difficult to perform, it is advisable to wipe the surface with a sponge dipped in a neutral soap liquid, and then rinse with water. However, pressure should not be performed in this process, so as not to wash off the corrosion products and cause high rating. The cleaning solution does not cause any damage to the coverage layer. Wash the sample during the middle or regular inspections, otherwise the corrosion behavior of the sample will be interfered.

The sample should be dry after cleaning.

To explain the surface rating, the defect of counting refers to the defects that can be visible to normal vision or corrective visibility.

(Note 1: After the initial inspection, you can further use optical instruments to depict the characteristics of defects.)

The edge defects within the edge of the sample or tape/paraffin 5mm can be indicated in the report, but it should not affect the digital rating. Similarly, defects such as flicks, hanging traces, and fixing holes can be ignored.

(Note 2: The samples of in -depth processing and manufacturing, such as edge defects above threads, holes, holes, etc. may be difficult to evaluate; in this case, the exact defects that the demand and supplier can be reported to the required report.)

When the coverage layer is anode to the substrate metal, the white corrosion products developed from the edge of the sample should not be considered to be invalid.

Sometimes it is necessary to wipe, polish, chemically clean the sample surface, so as to study the surface, but this treatment should be limited to as small as possible. For the 100mm × 150mm sample, its treatment area is best not to not. Greater than 100mmm. It should be explained to the area used to continue the test rating.

3. Rating representation

① Protecting rating representation

The digital rating system is based on corrosive substrate area. The calculation formula is as follows:


(Note 1: In some cases, it may be difficult to calculate the accurate area, especially the samples of deep processing such as threads, holes, etc. In this case, the inspector should accurately estimate this area as much as possible.)

For a sample with a small positive aspect, the calculation strictly according to the formula (1) will cause the rating to be greater than 10. Therefore, the formula (1) is limited to the sample of the area A> 0.046416%. Usually, the surface of no substrate metal corrosion is made by level 10. If necessary, the score value can be distinguished from various rated ratings between Table 1 rating.

(Note 2: When a coverage system with anode metal anodes of the substrate metal, a large amount of corrosive products are formed due to the formation of the coverage layer, and it may be difficult to evaluate the real protection rating. Because of the high adhesion of these corrosive products, they can The real area of ​​the corrosion of the substrate will be covered. For example, the steel coverage layer exposed to the salt -containing atmosphere. Although this standard can be used to rating the performance of the steel coverage layer of the steel, it may be difficult to determine its protection rating in some environments. ).)

If the defects are concentrated, the dot diagrams or photo standards listed in Appendix A and Appendix B can be used in standards. It can also use a flexible net board for a flexible net board for a flexible mesh for a 1mm × 1mm, 2mm × 2mm or 5mm × 5mm.

If you want to check a large group of samples at the same time, it is recommended to evaluate according to formula (1) one by one. After the entire group sample rating is over, each rating should be reviewed to ensure that each rating can truly reflect the deficiency of the sample. The review play a role in the verification of each rating and helps to ensure the judgment of the examiner or the reference system does not change due to factors such as changes in the lighting conditions or fatigue during the inspection process.

The following scheme can be used to improve inspection:

a) Take out the sample one by one from the exposure, and then compare the same samples;

b) Arrange all samples in the order of advantages and disadvantages.

② Expression of appearance rating

According to the following project evaluation, the appearance rating:

a) The type of defects determined by the classification given by Table 2;

b) Use the level of level 10 ~ 0 in Table 1;

c) Subjective evaluation of the degree of destruction, such as:

vs = Very mild;

s = mild;


M = moderate;


X = Drise.

The above is


The interception part of the quality inspection standard is applied to bathroom furniture. The quality inspection standards corresponding to different accessories are also different. According to the JG/T 427-2014, the product categories are different. Show:

For more detailed requirements, you can directly refer to the standard GB/T 6461-2002. For more stainless steel pipe information, please continue to pay attention to the release of the official website news information.


Stainless steel product tube

Stainless steel product tube

Stainless steel product tube

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