Overview of non-destructive testing of steel pipes

Introduction

Steel pipe products are the most important material in every industrialized country, ensuring the quality of steel pipe products is very important, with the development of steel production and the development of a variety of non-destructive testing methods complement each other.

1. Definition of non-destructive testing of steel pipes
The so-called non-destructive testing is in the steel pipe material, equipment, structure, etc. are not destroyed under the premise, the use of steel pipe material physical properties change with the characteristics of defects to detect the existence of defects and defects shape, size, location and development trend of the detection method (or process) is called non-destructive testing.

2. Definition and types of steel pipe defects
Steel pipe defects refer to the lack of continuity, purity uniformity of steel pipe material properties, or generally referred to as discontinuity. In the narrow sense, the damage refers to the geometric discontinuity, which is a kind of defect, and generally mixes the damage and defect together.

Discontinuities in steel pipe materials include:

1) The geometric discontinuity of the steel pipe: cracks, shrinkage holes, pinholes, delamination, pores, dimensional tolerances, etc.

2) The physical discontinuity of the steel pipe: stress concentration, uneven organization, etc.

3) Chemical discontinuity of steel pipes: segregation of chemical components.

Steel pipe in the production process is easy to produce a variety of defects, such as forging in the pressure processing will produce surface cracking, internal cracking, straight, decarburization, white spots; The rolling process of seamless steel pipe will produce dimensional tolerance, shape non-standard, heat treatment stress and heat treatment cracks in the process of steel pipe heat treatment.

3. Non-destructive testing method of steel pipe
At present, several commonly used defect detection methods, including eddy current, magnetic flux leakage, magnetic powder, penetration and visual inspection for steel pipe surface defects, can use ultrasonic, ray and other methods for internal flaw detection, and the latest acoustic emission, acoustic holography, far infrared, neutron ray, nuclear magnetic resonance and electromagnetic ultrasound and other ways. The method of irradiation by radiation is called X-ray detection (RT); The elastic wave method is called ultrasonic detection (abbreviation: UT), including acoustic holography; Electromagnetic testing using the electromagnetic properties of steel includes magnetic powder (MT), eddy current (ET), magnetic leakage (ET); EMI); Penetration testing using metal surface properties (PT); In addition to the above five conventional testing means, there are thermal imaging and infrared detection using the thermal properties of the product...

Galaxy Company Hot Sale Steel Pipe Products:

OCTG, casing, tubing, seamless steel pipe, line pipe, boiler tube, ASTM A333 pipe, ASTM A335 alloy pipes, API 5L pipe,, welded steel pipe,LSAW pipes, steel pipe inventory,  Chinese pipe factory, API 5L X52 pipe, pipe fittings, API 5CT pipe, Steel pipe, stainless steel pipes.