Butt Tee: tee butt is hot pressing or forging steel molding of the elbow, which is directly connected to form links with steel pipe welding, butt welding tee main manufacturing standards generally GB / T12459 , GB / T13401, ASME B16.9, SH3408, SH3409, HG / T21635, HG / T21631, SY / T0510. Butt tee generally Tee, reducing tee and other materials are carbon steel, alloy steel and stainless steel. Butt Tee Category: GB, electricity standard, technology standard, water standard, American Standard, the German standard, Japanese standard, the Russian standard, etc., as follows: GB / T12459-2005, GB / T13401-2005, ASME B16.9, SH3408, SH3409-96, SH3410-96, HG / T21635, DL / T 695, SY / T 0510, DIN 2615. For reducing tee, such as "T4 × 4 × 3.5" represents the same diameter of four inches diameter of 3.5 inches of reducing tees. Pressure rating and elbow pressure levels are the same, which is the same size range.