Fire-fighting grooved steel pipe fittings are steel pipe fitting products used in fire-fighting pipelines, connected by clamp-type fittings. They are a general term for components in grooved pipelines that serve functions such as connection, control, transformation, flow diversion, and support. Grooved pipe fittings are widely used in many industries, but currently, their application is most prevalent in firefighting pipeline systems.
Grooved pipe fittings refer to connecting pipe steel fitting products using clamps as the connection method. These products are widely used in many industries and are made of cast iron or cast steel. Their manufacturing can be divided into two parts: the base part, which is the product before plastic coating. These base parts are generally manufactured through die casting. This is one of the reasons why grooved pipe fittings are so easily replaceable. Because our grooved pipe steel fitting manufacturers use high-precision casting molds for precision casting of the black parts, the manufacturing precision of our grooved pipe fittings is very high. Also, because of this, our castings do not produce very thin-walled pipe fittings, and the pressure rating of the products used is mainly PN16 and PN25. After the black parts are completed, we spray them to complete the external anti-corrosion coating of the grooved pipe fittings. Because of the grooves in the grooved parts, it is impossible to perform immersion or rolling to complete the coating.
Below, taking steel elbows as an example, let’s look at the key points of manufacturing fire-fighting grooved pipe steel fitting steel elbows:
1. Welding rods should be kept dry during use. Titanium-calcium type should be dried at 150℃ for 1 hour, and low-hydrogen type should be dried at 200-250℃ for 1 hour. Prevent the electrode coating from sticking with oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of the weld. During steel elbow welding, repeated heating causes carbide precipitation, reducing corrosion resistance and mechanical properties. Post-weld hardening is significant, making cracking more likely. If using the same type of welding rod, preheating to above 300℃ and slow cooling to around 700℃ post-weld are recommended. If post-weld heat treatment is not possible, chromium-nickel stainless steel welding rods should be used.
2. To improve the corrosion resistance and weldability of stainless steel elbows, adding appropriate amounts of stabilizing elements such as Ti, Nb, and Mo improves weldability. When using the same type of chromium stainless steel welding rods, preheating to above 200℃ and tempering to around 800℃ post-weld are recommended. If post-weld heat treatment is not possible, chromium-nickel stainless steel welding rods should be used.
Post time: Feb-28-2026