Introduction and calculation formula of thermal expansion steel tube

We often say that hot-expanded pipe refers to a steel pipe with a relatively low density but a strong shrinkage, the China National Standards Association stipulates that the hot-expanded steel pipe should be a larger-diameter steel pipe expanded and deformed after the overall heating of the blank steel pipe.. Thermal expansion technology is to expand the diameter of the pipe through radial deformation, that is, non-standard, special models of seamless pipes can be produced using standard pipes, and the cost is low and the production efficiency is high. It is a common processing method for seamless pipes. Due to the high-parameter development of power plant boilers and the large-scale development of petrochemical plants, the demand for large-diameter seamless pipes is also increasing, and it is difficult for pipe rolling units to produce the seamless tube that diameters greater than 508mm, ratio of outside diameter to wall thickness(D/S)>25, thermal expansion technology, especially the relatively cost-effective medium frequency thermal expansion technology has gradually developed thus it.

The two-step propelling pipe expander used for hot-expanded steel pipes combines cone die diameter expansion technology, digital intermediate frequency induction heating technology, and hydraulic technology in one machine. With its reasonable process, lower energy consumption, lower construction investment, and good The product quality, wide range of raw materials and product specifications, flexibility and low input production batch adaptability have replaced the traditional pull-type diameter expansion technology of the steel pipe industry.

It should be noted that the mechanical properties of hot-expanded steel pipes are generally slightly worse than hot-rolled steel pipes.

The general process of thermal expansion of the pipe is to fix the pipe on the lead screw, place a cone-shaped top anvil with a diameter larger than the diameter of the pipe into the other end of the pipe, and link and fix the other screw in the pipe. The connection between the pipe and the top anvil is at Below the intermediate frequency heating coil, in order to counteract the heating too fast and burst, you need to pass water in the tube first, start the coil heating, and after reaching the specified temperature, the screw that links the tube pushes the tube, so that the tube moves toward the top anvil and extends. The top anvil taper enlarges the pipe diameter. After the entire pipe passes, the pipe will not be straight because of the thermal expansion process, so he needs to straighten it.

The above is the basic content of thermal expansion technology.

The following is the relevant formula of thermal expanded pipe

Expanded weight:

carbon steel: (diameter-thickness) times thickness times 0.02466 = weight of one meter(kg)

alloy: (diameter-thickness) times thickness times 0.02483 = weight of one meter (kg)

number of meters after hot expanded

original tube Diameter divided by hot expanded diameter times 1.04 times length *

original tube meters

expanded length times (diameter divided by original tube diameter divided by 1.04)

speed:

100000 divided by (original diameter-thickness times thickness)

thickness:

expanded thickness (1 time) ) = Original tube thickness times 0.92

Expanded thickness (2 times) = Original tube thickness*0.84

Diameter :

Expanded diameter = mould size + expanded thickness times 2

Mould size: expanded diameter-2 * expanded walls Thickness

Diameter tolerance

Diameter 426mm, tolerance plus-minus 2.5

Diameter426-630mm,tolerance plus-minus 3

Diameter630mm, tolerance plus-minus 5

Ellipticity:

Diameter 426mm, tolerance plus-minus 2

Diameter426mm, tolerance plus-minus 3

Thickness:

thickness less than or equal to 20mm, tolerance 2 -1.5

thickness less than or equal to 40mm3 -2

Pipe for making Pipe fitting

5 -0

Inside and outside of scratch

Scratch deepth : 0.2mm,length:2cm, it is called scratch. Not allowed

Straightness: less than or equal to 6meter,bend is 5mm less than or equal to 12meter,bend is 8mm

For example:

Original tube 610*19 hot expanded 660*16

Original pipe length:12.84meter

Expanded thickness:19*0.92=17.48(1time)

19*0.84=15.962times

Expanded length of pipe:610 divided by 660*1.04*12.84=12.341962

Expanded diameter:625+17.48*2+1=660.96(1time)

625+15.96*2+1=657.92(2times)

Module Size:660-2*16=628

Media Contact
Company Name: Tianjin Sanon Steel Pipe Co.,LTD.
Email:Send Email [https://www.abnewswire.com/email_contact_us.php?pr=introduction-and-calculation-formula-of-thermal-expansion-steel-tube]
Phone: 0086-22-58658800
Address:Floor 8. Jinxing Building, No 65 Hongqiao Area
City: Tianjin
Country: China
Website: https://www.sanonpipe.com/

Legal Disclaimer: Information contained on this page is provided by an independent third-party content provider. ABNewswire makes no warranties or responsibility or liability for the accuracy, content, images, videos, licenses, completeness, legality, or reliability of the information contained in this article. If you are affiliated with this article or have any complaints or copyright issues related to this article and would like it to be removed, please contact retract@swscontact.com



This release was published on openPR.