The methods for determining the product quality of alloy steel pipes are as follows:
1. Test the key components, such as Cr and C, in the alloy steel pipe.
2. Test the compressive strength of the hardened surface layer of the alloy steel pipe.
3. Check the surface flatness of the alloy steel pipe and whether the welded joints are uneven, ensuring that all hardened surface layers are of uniform thickness to prevent damage during repairs.
4. Observe the hardness of the alloy steel pipe surface. Higher hardness indicates better wear resistance and compressive strength.
5. Conduct a repeated bending test on the alloy steel pipe. Clamp one end of the sample and repeatedly bend it in the opposite direction on a cylindrical surface of a specified radius to test the metal’s repeated bending resistance and reveal its defects.
6. Hammer or forge a sample of specified dimensions. This test examines the alloy steel pipe’s ability to withstand upsetting plastic deformation at room temperature or high temperature and reveals its defects.
7. An upsetting test conducted at room temperature is called a room temperature upsetting test, also known as a cold upsetting test. The upsetting test performed on alloy steel pipes in a hot state is called the hot upsetting test.
8. The pipe flanging test involves pressing the center of a specified shape into one end of the metal pipe, causing the pipe wall of the alloy steel pipe to be uniformly rolled to a specified size. This test assesses the pipe wall’s ability to withstand plastic deformation.
9. The pipeline hydrostatic test involves filling the alloy steel pipe with water or a specified liquid and subjecting it to a specified pressure for a period of time. This test assesses the quality and strength of the alloy steel pipe and reveals any defects.
Post time: Jun-03-2026