Features of stainless steel flanges

　　1) high electricity rate, about 5 times the carbon steel.

　　2) large linear expansion coefficient, 40% larger than carbon steel, and with the temperature rise, the coefficient of linear expansion coefficient is also increased accordingly.

　　3) low thermal conductivity, about 1/3 of carbon steel.

　　Use Note:

　　1, in order to prevent the heating caused by the flange cover between the eye corrosion, welding current should not be too much, less than about 20% of carbon steel electrode, arc should not be too long, cold between the layers to narrow the weld is appropriate.

　　2, the electrode should be used to dry, titanium calcium type should be dried at 150 ℃ for 1 hour, low a hydrogen type should be 200-250 ℃ drying 1 hour (can not be repeated drying, or easy to peel the skin peel), to prevent Welding paste oil and other dirt, so as not to cause the weld to increase the carbon content and affect the quality of welding.

　　3, flange pipe welding, by repeated heating precipitation of carbides, reducing corrosion resistance and mechanical properties.