By elbow viewpoints points, 45 ° elbow, there are 90 ° and 180 ° elbow bend. Fulfill the specification has GB / T12459-2005, GB / T13401-2005, GB / T10752-1995, HG / T21635-1987, D-GD0219 and other various models from DN15-DN1500 carbon steel elbow English (Carbon steel elbow) first according to its radius of curvature can be divided into long radius elbows and short radius elbows. Long radius elbow refers to its radius of curvature is equal to 1.5 times the pipe diameter, i.e. R = 1.5D. Short radius elbow refers to its radius of curvature equal to the pipe diameter, ie R = 1.0D. (D is the bend diameter, R is the radius of curvature .D can also be used to represent the times.) If the pressing force rating points, about seventeen kinds, and the US standard pipe is the same, there are: Sch5s, Sch10s, Sch10 , Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS, during which the most common are two kinds of STD and XS. 

palabras clave: Carbon steel elbow, Q235 carbon steel elbow, 20 # carbon steel elbow,