What are the standards for seamless pipes?

Introduction of Seamless Pipe

The production of seamless pipes is a complicated process. We take the production process of hot-rolled Seamless Steel Pipes as an example. The first step is to check whether the good pipes are ready or not, and then heat and perforate the bad pipes. When the pipes are bad and perforated After completion, the tube is rolled, and the seamless Steel Tube is then heated to reduce its weight. After a certain heat treatment of the Seamless Steel Pipe, the pipe is straightened and finished. If the pipe is not damaged or physicochemical, it can be checked and stored. The production process of cold-rolled seamless Steel Pipe is completely different from that of hot-rolled seamless steel pipe. First, the bad material should be prepared, and then the bad material should be pickled and then lubricated, and the lubricated bad material should be cold-rolled. After heat treatment, the heat-treated bad material can be straightened and finished. If there is no problem, it can be checked and put into storage.

Standard for seamless pipes

The mechanical properties of steel are one of the important indicators for judging the quality of seamless steel pipes. Generally speaking, the mechanical properties of a steel depend on the composition of the steel and the system of heat treatment. The standard of seamless steel pipe includes its tensile properties, yield strength, elongation, hardness and other indicators.

1. Tensile properties of seamless steel pipes - tensile strength

The tensile strength of the seamless steel pipe can be expressed by dividing the maximum force it can withstand in the unit of Fb by the cross-sectional area So of the steel pipe, and the unit is N/mm2, that is, MPa. The tensile strength represents the degree of damage that the seamless steel pipe can withstand under the maximum tensile force.

2. Yield point of seamless steel pipe

The unit of yield point can be expressed in MPA (ie N/mm2), which represents the continuous elongation force that the seamless steel pipe can bear during the stretching process of the seamless steel pipe. The yield point is divided into two types, one is the upper yield point and the lower yield point, the upper yield point refers to the magnitude of the first drop of the force, and the lower yield point refers to the minimum force that the metal receives during the yielding process.

3. Hardness of seamless steel pipe

Hardness refers to the ability of seamless steel pipes to resist hard objects when squeezed. There are many types of hardness, such as HB (Brinell hardness), Rockwell hardness and Vickers hardness.

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