JISG 3444 China popular use dn100 steel pipe quality control points

High pressure steel pipes are widely used for stainless steel seamless steel pipes Low temperature and corrosion-resistant environmental piping systems, mechanical properties, process performance, and corrosion resistance are three important indicators for measuring the quality of steel pipes, and are also important guarantees for ensuring safe navigation of ships. In the practical application of a stainless steel chemical ship, it was discovered that there were leaks in the deck cargo pipeline after the first voyage. After pressure testing, it was found that there were more than 10 hole like leaks. Multiple surface quality issues, including internal wall pitting and surface cracks, were discovered during the manufacturing of ethylene marine cans. So how to fundamentally solve these problems?

According to the production process diagram of JISG 3444 China popular use dn100 steel pipe (Figure 1), the round steel billet is perforated Seamless steel pipes are produced through main processes such as cold drawing/cold rolling, solid solution, straightening, and pickling, with complementary pipeline links, especially quality control of raw materials and intermediate products, to ensure the chemical composition of finished product management Important guarantees for surface quality, mechanical properties, process performance and corrosion resistance in accordance with specifications and standards.

1. Control the quality of raw materials

The main raw materials used for the production of seamless steel pipes are continuous casting round tube billets and rolling (forging) round steel. Ensuring the quality of the steel billets is a key factor in ensuring the quality of the steel pipes, including steelmaking level, pouring and cooling processes, and forming quality.

2. Ensure the accuracy and uniformity of hot furnace temperature control

The hot furnaces used in the manufacturing of seamless steel pipes include billet heating furnaces and steel pipe heat treatment furnaces. The accuracy and uniformity of temperature control are two important indicators for judging the quality of heating equipment, and are also important guarantees for the heating process. Therefore, manufacturers should strictly adhere to the service life and calibration cycle of thermocouples, and test the uniformity of furnace temperature.

3. Optimize inspection process and equipment

Intermediate product inspection is the key to controlling the quality of finished stainless steel seamless steel pipes during the production process, especially the surface quality of the inner wall. Attention should be paid to grasping from the source.

The above is the relevant content on controlling the quality of JISG 3444 China popular use dn100 steel pipe. I hope to give you some help!