Allowable Deviation Value of Seamless Pipe Wall Thickness

International standards:

According to international standards, the allowable deviation value of seamless pipe wall thickness should comply with the following regulations:

1. For seamless steel pipes with wall thickness > or = 20mm, the allowable deviation value should be within plus or minus 10%;

2. For seamless steel pipes with 2.5mm ≤ wall thickness ≤ 20mm, the allowable deviation value should be within plus or minus 12.5%;

3. For seamless steel pipes with wall thickness less than 2.5mm, the allowable deviation value should be within plus or minus 0.5mm.

Generally speaking, international standards have strict requirements on the allowable deviation value of seamless steel pipe wall thickness.

Domestic standards (China):

According to the relevant provisions of the domestic standard GB/T 8163-2008 "Seamless Steel Pipe", the allowable deviation value of the wall thickness of seamless steel pipes should meet the following requirements:

1. For seamless steel pipes with wall thickness > or = 20mm, the allowable deviation value should be within plus or minus 12.5%;

2. For seamless steel pipes with a wall thickness of 2.5mm ≤ 20mm, the allowable deviation should be within plus or minus 15%;

3. For seamless steel pipes with wall thickness less than 2.5mm, the allowable deviation value should be within plus or minus 0.45mm.

Domestic standards have relatively loose tolerances on the wall thickness of seamless pipes, but they still need to meet the requirements of relevant standards.

The meaning of the allowable deviation value:

The allowable deviation value of the seamless steel pipe wall thickness refers to the allowable gap between the seamless steel pipe wall thickness and the design wall thickness during the production process. The scope of this gap is specified by relevant standards, and its purpose is to control the quality of seamless steel pipes and ensure their stability and reliability during use.

In general, the allowable deviation value of the wall thickness of seamless steel pipes is a very important parameter. Different countries and regions have corresponding standards and regulations. Manufacturers and users should strictly abide by them to ensure the quality of seamless steel pipes. Quality and