F5 flange

F5 of F5 flange is a chromium alloy, because it has strong resistance to thermal sulfide corrosion cracking. 5% chromium material has higher small mechanical properties than 1 1/4% and 2 1/4% chromium, which makes it very suitable for high temperature and high pressure applications

In addition, 5% chromium can be used for high temperature and actual report based processes and services. Typical temperature applications range from - 20 ° to 1200 ° F

Usability - P5

Seamless pipe: 1/2 "– 24"

Butt welded pipe fittings: 1/2 "– 24"

Flange: 1/2 "– 24" Pressure

Fittings: 1/8 "– 4"

Specification - P5

ASTM/ASMEA335, A182, A2344

Precautions for the use of F5 flanges

Cold quickly, The narrow weld bead is preferred

2. The welding rod shall be kept dry during use. The titanium calcium type shall be dried at 150 ℃ for 1 hour, and the low hydrogen type shall be dried at 200-250 ℃ for 1 hour (repeated drying is not allowed, otherwise the coating is easy to crack and flake) to prevent the coating of the welding rod from sticking oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of the weldment

3. When F5 flange pipe fittings are welded, carbides are precipitated due to repeated heating, and the actual report is dominant and the mechanical properties are reduced

4. Chrome F5 flange pipe fittings have large hardenability American standard flange after welding, which is easy to crack. If the same type of chromium stainless steel electrodes (G202, G207) are used for welding, preheating above 300 ℃ and slow cooling treatment at about 700 ℃ after welding are required. If the weldment cannot undergo post weld heat treatment, F5 welding rods for flange pipe fittings (A107, A207) shall be selected

5. For F5 flange, appropriate stability elements such as Ti, Nb and Mo are added to give priority to corrosion resistance and weldability for practical effect. The weldability is better than that of chrome F5 flange. When the same type of chrome F5 flange welding rods (G302, G307) are used, preheating above 200 ℃ and tempering at about 800 ℃ after welding shall be carried out. If the weldment cannot be heat treated, F5 welding rods for flange pipe fittings (A107, A207) shall be selected

6. F5 flange pipe fittings, butt welding flange welding rods have good actual report oriented and oxidizing properties, and are widely used in chemical, fertilizer, petroleum, diagnosis and treatment machinery manufacturing