Ovality and length of seamless carbon steel pipes

Date:2024-02-23Tags:seamless carbon steel pipe
Ovality and length of seamless carbon steel pipes

Seamless carbon steel pipe ovality standard

1. Definition of ellipticity

The ovality of seamless carbon steel pipe refers to the degree of deviation between the long axis and the short axis of the steel pipe section. Generally speaking, the smaller the ovality, the closer the shape of the steel pipe is to a circle. Ovality is an important indicator of the dimensional accuracy of steel pipes and one of the important standards for measuring the production process level of seamless carbon steel pipes.


seamless carbon steel pipe


2. Calculation method of ellipticity

Ovality, also known as out-of-roundness, refers to the difference between the maximum diameter and the minimum diameter of rolled materials with circular cross-sections such as round steel and circular steel pipes.

The measurement method of steel pipe ovality basically belongs to the diameter method. Any method of measuring diameter can be used to measure ovality. That is, after measuring the maximum diameter and the minimum diameter respectively, the difference is found, which is the ellipticity value. Calculation formula for steel pipe ovality: ovality = (difference between the maximum outer diameter of the steel pipe - the minimum outer diameter of the steel pipe)/nominal outer diameter

There are generally two methods for calculating the ovality of seamless carbon steel pipes, namely calculating ovality and calculating roundness deviation. Among them, the calculation method of ovality is the difference between the long axis and the short axis of the steel pipe divided by the average value of the inner diameter or outer diameter of the steel pipe, that is, Δ=(D_max-D_min)/(D_max+D_min)×100%. The calculation method of roundness deviation is the ratio of the difference between the maximum circumference and the minimum circumference of the steel pipe and the circumference of the steel pipe, that is, Δ=(L_max-L_min)/L×100%.

3. Standard value of ovality

Different countries and standards have different standard values for the ovality of seamless carbon steel pipes. Common international standards include GB/T 17395, ASTM A500, ASTM A53, ASTM A513, EN10210, etc. Taking GB/T 17395 as an example, it stipulates that the ovality standard for steel pipes with DN<150mm is 1% or 0.8%, and the ovality standard for steel pipes with DN≥150mm is 0.7% or 0.5%. According to the ASTM A500 standard, the ovality of steel pipes should be less than or equal to 1% of the nominal diameter (OD).

Summarize:

Steel pipe ovality is one of the important indicators indicating the dimensional accuracy and production technology level of steel pipes. There are two methods for calculating ellipticity, namely calculating ellipticity and calculating roundness deviation. Different countries and standards have different ovality standards for seamless carbon steel pipes. You can make judgments by referring to relevant standards and specifications.

Seamless carbon steel pipe length range

The commonly used lengths of seamless carbon steel pipes are 6 meters, 9 meters, and 12 meters.

Seamless carbon steel pipe is a commonly used metal material, widely used in manufacturing construction, mechanical equipment, automobile parts, etc. Different specifications of steel pipes have different applicable length ranges. Generally speaking, the length range of seamless carbon steel pipes is 6 meters, 9 meters, and 12 meters. Among them, the length of smaller diameter pipes is mostly 6 meters, and the length of larger diameter pipes is mostly 9 meters or 12 meters. This is because shorter pipes are easier to transport and install, while longer pipes can reduce the number of welds to a certain extent and improve the strength and toughness of steel pipes.

Things to note when purchasing seamless carbon steel pipes:

1. Select the appropriate length of steel pipe according to the usage requirements. Using shorter lengths of steel pipe can increase production efficiency and reduce costs, but the required strength and toughness need to be considered. Generally speaking, smaller diameter and shorter length pipes are more versatile, while larger diameter and longer length pipes are used to withstand greater loads and pressures.

2. Select steel pipes of appropriate specifications. The outer diameter and wall thickness of steel pipes are important indicators to consider when purchasing. Steel pipes with different outer diameters and wall thicknesses have different uses and need to be selected according to specific usage requirements.

3. Determine the material and surface treatment of the steel pipe. Seamless carbon steel pipes are usually divided into several types: ordinary carbon steel pipes, low alloy high-strength steel pipes, alloy steel pipes, etc. In addition, the surface treatment method of steel pipes also needs to be selected according to the conditions of use, such as spray painting, anti-corrosion treatment, etc.

4. Check the quality of steel pipes. When purchasing steel pipes, it is necessary to check whether the appearance quality, dimensional deviation, chemical composition, mechanical properties and other indicators comply with national standards and contract requirements.

Conclusion:

When selecting the length of seamless carbon steel pipes, steel pipes of appropriate length should be selected according to specific usage requirements, and attention should be paid to the strength, toughness and other characteristics that these steel pipes need to have. When purchasing steel pipes, you also need to consider issues such as material, surface treatment, and quality requirements. Through reasonable purchase and use, the service life of steel pipes can be made more stable and safer.


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