Testing of The Outer Diameter of Seamless Steel Pipes

The diameter range of seamless steel pipes is 4~900mm. According to different usage, seamless steel pipes can be divided into thick wall seamless steel pipes and thin wall seamless steel pipes.

Now let's learn about the outer diameter detection of seamless steel pipes:
The accuracy of outer diameter of steel pipes: It depends on the diameter setting method, equipment operation, process system, etc.
 
Allowable deviation of outer diameter δ=(D-Di)/Di ×100%
D: the limit value of the outside diameters
Di: Nominal outside diameter(mm)
The ellipticity of steel pipes: It indicates the degree of unroundness of steel pipes.

As an online measuring equipment, the large diameter caliper can accurately measure the outside diameter and the ellipticity. Its measurement accuracy is related to the measurement range, but it can generally meet the production needs and monitor the quality of rolled material in production. The outer diameter is measured by double probes with adjustable spacing, which can realize the online detection of the outer diameter size. The measurement is accurate and non-destructive. The measurement range can be adjusted at any time through the key, so that it is within the detection range of seamless steel pipes, and the testing of all steel pipes can be done.
 
The measuring of ellipticity can be generally divided into two kinds of methods. Some steel pipes are being rotated in production. At this time, the outside diameter limit and ovality can be tested online by only a set of double head caliper gauges. However, some steel pipes can not be rotated so that they can not be tested. Then, you need to install a set of more double probes, the two-way measurement so that the elliptical dimension is calculated. Two transmitting lenses and two receiving lenses can be comprised of two sets of double-cylinder photoelectric probes, and the data acquisition of the caliper is completed by these two sets of probes. Two sets of adjusting devices adjust the distance between the two sets of photoelectric probes respectively.
 
The large diameter caliper can be applied to the detection of seamless steel pipes in various rolling production processes. It can detect hot rolled materials and cold rolled materials. The measured data is objective. The measurement accuracy is high. The real-time is good, and the measurement results are kept intact.
 
The large-diameter caliper is an online testing equipment designed for various large-size rolling materials. It can realize nondestructive testing and display the measured data in real time. When out of tolerance is encountered, it will give an automatic alarm.
 
The convenience brought by online testing equipment for nondestructive testing is incomparable to that brought by manual testing. It plays a key role in improving quality and it is irreplaceable.