A106Gr.B elbow is an elbow formed by steel molding or forging process. The connection method is butt welding of elbows and stainless steel pipes, and the two product workpieces are heat welded with resistors along all ports at the same time. Generally, there are two methods: resistance welding and electroslag pressure welding.
ASTM A106Gr.B steel pipe elbow elbow tee and four-way reducer and large and small head pipe fittings. Before the elbow is processed, in order to prevent welding deformation, the butt welded elbow will be checked into the integral outer tiles on both sides of the elbow, and then stainless steel The arc plate strengthens the main keel structure. According to the basic electric welding method, argon filling is required for welding. Based on the above factors, internal and external welders choose symmetrical electric welding during the welding process, which not only overcomes the argon filling problem, but also forms quite well.
Chemical Composition (%) of ASTM A106 Pipe Fitting Elbow
| Grade | C | Mn | P | S | Si | Cr | Mo | Ni | Cu | V | Nb |
| WPB | 0.3 | 0.29-1.06 | 0.05 | 0.058 | 0.1min | 0.4 | 0.15 | 0.4 | 0.4 | 0.08 | 0.02 |
| WPC | 0.35 | 0.29-1.06 | 0.05 | 0.058 | 0.1min | 0.4 | 0.15 | 0.4 | 0.4 | 0.08 | 0.02 |
Carbon Steel Pipe Fittings
ASTM A106 Pipe Fitting Elbow Mechanical Properties
| Tensile Requirements | WPB | WPC, WP11CL2 | WP11CL1 | WP11CL3 |
| Tensile Strength, min, ksi[MPa] | 60-85 | 70-95 | 60-85 | 75-100 |
| (0.2% offset or 0.5% extension-under-load) | [415-585] | [485-655] | [415-585] | [520-690] |
| Yield Strength, min, ksi[MPa] | 32 | 40 | 30 | 45 |
| [240] | [275] | [205] | [310] |
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