What Should We Pay Attention To When Making Stainless Steel Elbows?

Stainless steel in Stainless Steel Weld Elbow is usually made by adding a high proportion of Cr, Ni and other alloys to carbon steel, and the content ratio can reach more than 20%. The following Zhitong Pipe Valve will show you what to pay attention to when making stainless steel elbows?

The stainless steel raw materials in stainless steel elbows are interstitial solid solutions formed by elements such as chromium and nickel in γ-Fe, which should be considered as the mainstream stainless steel type. The main characteristics of this type of steel are: it has a non-magnetic austenitic structure at room temperature, its yield strength ratio is low, plasticity is good, welding performance, and it is easy to be trained and cast forged hot forming.

The stainless steel elbow welding rod should be kept dry when used. The titanium calcium type should be dried at 150℃ for 1 hour, and the low hydrogen type should be dried at 200-250℃ for 1 hour (it cannot be dried repeatedly, otherwise the coating will easily crack and peel off), to prevent the welding rod coating from sticking oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of the weldment.

When welding stainless steel elbows, carbides are precipitated by repeated heating, which reduces corrosion resistance and mechanical properties. The hardening property after welding is large and cracks are easy to occur. If the same type of welding rod is used for welding, preheating above 300℃ and slow cooling treatment of about 700℃ after welding are required. If the weldment cannot be heat treated after welding, chromium-nickel stainless steel welding rods should be used.