Several levels of low magnification acid etching inspection are qualified national standards or indu

1. Alloy structural steel GB T3077-1999 stipulates: There shall be no visible shrinkage holes, bubbles, cracks, inclusions, peeling, white spots, and intergranular cracks on the low-magnification cross-section acid leaching low-magnification tissue specimen. Among them, high-quality ingot type segregation 3, center porosity 3, general porosity 3, general punctate segregation 1, edge punctate segregation 1;High-grade high-quality steel (steel grade after adding a) ingot-type segregation 2, center porosity 2, general porosity 2, general punctate segregation and edge punctate segregation are not allowed; Special grade high-quality steel (steel grade followed by E) ingot type segregation 1, center porosity 1, general porosity 1, general point segregation and edge point segregation are not allowed.

The general punctate segregation and edge punctate segregation of 38crmoal or 38crmoala steel should not exceed and grade, respectively. The inspection standard is GB T226, GB T1979. If the supplier can ensure that the low magnification is qualified, it is allowed to use the ultrasonic flaw detection or other non-destructive testing methods specified in GB T7736 instead.

The representative steel grade is 20mn2......2. High-quality carbon structural steel GB T699-1999 stipulates that there shall be no visible shrinkage holes, bubbles, cracks, inclusions, peeling and white spots on the cross-section acid leaching low-power structure test piece of low-magnification sedation steel steel. Defects such as subcutaneous inclusions that do not exceed the allowable depth of surface defects are allowed in steel for cutting. Among them, the segregation of high-quality steel ingots is 3, the center is loose 3, and the general is loose 3,; High-grade high-quality ingot type segregation, loose center, general loose; Special grade high-quality steel ingot type segregation, loose center, general loose.

The inspection standard is GB T226, GB T1979. In addition, if the supplier can ensure that the low magnification is qualified, it is allowed to use the ultrasonic flaw detection or other non-destructive testing methods specified in GB T7736 instead. Let's find some standards for yourself......

Search: How many levels of low-magnification acid etching inspection are qualified national standards or industry standards?

jb/t ,ok。Note that there is a space after t, and the dash is actually a Chinese character, the same below.

jb/t ,ok

YB T 5148-1993 has been repealed and replaced by GB T 6394-2002

YB T 5211-1993 is also in force, but I heard that there will be changes soon, so please be careful. It is said that it will not be long, but it may drag on for a long time.

The arrival acceptance of the new valve is mainly based on the valve-related inspection report provided by the first supplier, followed by whether the shape and packaging are damaged during the transportation process. Most of the after-sales warranty of the valve starts after installation and use.

Yes, all of them have clear requirements.

..A device, its use is different, the requirements are also different. There's no set standard, right?

Let's go to the China Paint Network to find it.

Content or version number rules, you ask?

Document number, revision, release date, owner.

There should also be a record of revisions, dates, makers, reviewers, approvers, and a summary of changes.

The content includes purpose, scope of application, definitions, references, qualification requirements, procedural requirements, inspections, and archival materials.

These are all enriched by typography.

It seems that ISO9001 has a requirement.

You can find this information at the address below, you can take a look at it, it should help you!

Standard number: GB 226-1991

Standard name: Low magnification structure and defect etching test method of steel.

Standard Status: Active.

Alternate case: GB 226-1977

Date of implementation: 1992-03-01

Promulgating Departments: State Bureau of Technical Supervision.

Brief introduction: This standard stipulates the hot and cold acid etching method and electric corrosion method for testing the low-magnification structure and defects of steel.

This standard is applicable to the inspection of low-magnification structure and defects of steel. In the arbitration inspection, if there are no special provisions on the technical conditions, the hot acid leaching method shall prevail.

For the time being, there is no unified standard for the entire printing industry, that is to say, there is no national standard, and the relevant ministries and commissions are being formulated. . .

National Standards of the People's Republic of China.

gb／t 191—2008

Pictorial signs for packaging, storage and transportation.

You can refer to foreign standards, and the national standards introduced in the future will largely follow international standards. After all, there will be more and more imports and exports.

Please refer to GB T 1839-2008 "Test Method for the Quality of Galvanized Coating of Steel Products", QB T 3814-1999 "Test Method for Appearance Quality of Metal Coatings and Chemical Treatment Layers of Light Industrial Products" and other relevant standards.

If you need such standards, please leave your email address.

1.Test, measurement or monitoring equipment for electrical safety protection testing of low-voltage distribution systems below AC 1000V and DC 1500V Part 2: Insulation resistance GB t;

2.Test, measurement or monitoring equipment for electrical safety protection testing of low-voltage distribution systems below AC 1000V and DC 1500V Part 2: Insulation resistance GB t;

3.Low-voltage switchgear and control equipment Part III: Special requirements for low-voltage switchgear and control equipment – switchboards accessible to non-specialists GB;

4.Low-voltage switchgear and control equipment Part V: Special requirements for cable distribution boxes (CDCS) for power distribution networks for outdoor public equipment GB

5.Surge protective devices (SPDs) for low-voltage distribution systems Part 1: Performance requirements and test methods GB ;

6.Electrician terminology Generation, transmission and distribution Power generation GB t ;

7.Electrician terminology Generation, transmission and distribution Substation GB t ;

8.Electrician terminology Power generation, transmission and distribution Power system planning and management GB t ;

9.Electrician terminology Generation, Transmission & Distribution Running GB T ;

10.Electrician terminology Generation, transmission and distribution General terminology GB t ;

11.Technical Guidelines for Live Work on Distribution Lines GB T 18857-2002

Your request is not specific, I have written everything I know, I hope it will help you.

National Standards hope it helps you.