13CrMo4-5 ND Alloy Steel Seamless Pipe

Product presentation

The mechanical properties of boiler pipe is an important index to ensure the final service performance (mechanical properties) of steel, which depends on the chemical composition and heat treatment system of steel. In the steel pipe standard, according to different use requirements, the tensile performance (tensile strength, yield strength or yield point, elongation), as well as hardness and toughness indicators, as well as high and low temperature performance required by users.

In the production process of seamless steel pipe for boiler, heat treatment is the key process. Heat treatment has an important impact on the internal quality and surface quality of seamless steel pipe, which is particularly important for the production of alloy seamless steel pipe.

Our company adopts non-oxidation heat treatment, the production of steel pipes with stable metallographic organization and good internal and external surface quality, using eddy current and ultrasonic automatic flaw detection, steel pipe one by one for eddy current flaw detection and ultrasonic flaw detection. With ultrasonic thickness measurement and oblique flaw detection functions, it can effectively detect the layered defects in the steel pipe.

Quality inspection method of seamless steel pipe

1. Chemical composition analysis: chemical analysis method, instrument analysis (infrared C-S instrument, direct reading spectrometer, zcP, etc.).

2. Surface quality inspection of steel pipe: 100%

① Manual visual inspection: lighting conditions, standards, experience, identification, steel pipe rotation.

② NDT inspection:

A. Ultrasonic detection UT:

B. ET: (electromagnetic induction)

C. MT and leakage detection:

Magnetic flaw detection, suitable for the detection of surface and near-surface defects of ferromagnetic materials.

D. Electromagnetic ultrasonic flaw detection:

No coupling medium is needed, which can be applied to high temperature and high speed, rough and dry steel pipe surface flaw detection.

E. liquid penetrating test:

Fluorescence, coloring, and detecting of steel pipe surface defects.

3. Physical and chemical performance inspection of steel pipe；

4. Process performance inspection of steel pipe；

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