Building Materials Co., Ltd. mainly produces Liaocheng Shunxiang variety of milling of cast iron pipe, high quality ductile iron pipe, flexible cast iron pipe fittings, cast iron pit wells quality of our products. Tensile strength (σb) during the tensile specimen 40 # seamless steel pipe inspection records, at the time of exposure to pull off the most vigorous (Fb) seamless steel pipe, divided by the original specimen cross-sectional area (So) obtained stress (σ), called the tensile strength (σb), in units of N/mm2 (MPa). It is a metal material to resist damage under tension maximum capacity. Building Materials Co., Ltd. mainly produces Liaocheng Shunxiang variety of milling of cast iron pipe, high quality ductile iron pipe, flexible cast iron pipe fittings, cast iron pit wells quality of our products. Reason: ① internal defects due to surface defects or tube is brought. ② the production process, such as the rolling process parameters is incorrect 40 # seamless design advantages, the mold surface is not smooth, poor lubrication conditions, pass design and adjustment unreasonable. ③ tube (pipe) in a heated rolling, heat treatment and straightening process, if properly controlled because the heating temperature, deformation uneven heating and cooling rate is unreasonable or too large deformation of straightening excessive residual stress, then may also lead pipe surface cracks. Bayinguoleng seamless steel pipe, ductile pipe Shunxiang 40 # seamless steel pipe inspection records provided by Shunxiang ductile pipe. Liaocheng Shunxiang Building Materials Co., Ltd. (www.lcsxjc.com) in ductile iron pipe, seamless steel tubes, precision steel and other industries have high visibility, integrity management, both quality of service, welcome to inquire or consult our "commercial Union Service "it!