Carbon steel seamless steel pipe testing method for ships

Seamless steel pipe pressure testing machine, seamless steel pipe yield testing machine, seamless steel pipe tensile strength testing machine

Testing of mechanical properties:

Carbon steel seamless steel pipe mainly detects internal water pressure, bending, compression, residual deformation, compressive strength, deformation stiffness, compression deformation, tensile strength, yield strength, elongation, elongation after fracture, flattening, etc. test.

skills requirement:

1. The bending degree of carbon steel seamless steel pipe shall not be greater than

Wall thickness ≤ 15mm: 1.5mm / m

Wall thickness >15mm: 2.0mm/m

Outer diameter ≥ 325mm: 1.5mm / m

2, carbon steel seamless steel pipe commonly used mechanical properties to meet

Brand

Steel grade

tensile strength

Yield point

Elongation

C10

320

320-440

206

25

C20

410

410-530

245

twenty two

The nominal minimum yield point or 0.2% yield strength of steel pipes at 50 ° C or higher shall be in accordance with the regulations. When the ship inspection department proposes, the supplier provides information on high temperature performance or conducts verification tests.

3. Carbon steel seamless steel pipe flattening test or bending test:

A. When the carbon steel seamless steel pipe is used for the flattening test, the distance between the plates after flattening is calculated according to the formula:

H=[(1+a).S]/[a+S/D]

Where: H is the distance between the flat plates after flattening

S steel pipe wall thickness

D steel pipe outer diameter

a deformation coefficient

After the flattening test, there should be no cracks on the specimen. Microcracks at the edge of the specimen shall not be evaluated.

The flattening test of steel pipe wall thickness greater than 10mm.

B. When bending test, the diameter of the curved core should be 4 times of the wall thickness of the steel pipe and bent by 180°. There were no cracks and delamination on the specimen after the test. Microcracks at the edge of the specimen shall not be evaluated.

4. Carbon steel seamless steel pipe flare test or crimp test

Boilers and superheated organs with an outer diameter of 18mm-146mm shall be subjected to a flare test or a crimping test.

5, hydraulic test

A. Carbon steel seamless steel pipe shall be hydrostatically tested one by one, and the pressure of the hydrostatic test shall be calculated according to the formula:

P=2bS/D

Where: P test pressure

D steel pipe outer diameter

S steel pipe wall thickness

b stress

B. The pressure test time of the hydraulic test shall be not less than 10s, and the steel pipe shall not leak or seep.

C. With the consent of the ship inspection department, non-destructive testing is allowed to replace the hydrostatic test.

For details, please contact Jinan Zhongchuang Industrial Testing System Co., Ltd. 0531-8555885 15689703761 QQ 3070594936
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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