Liaocheng Shunxiang Building Materials Co., Ltd. (www.lcsxjc.com) located in Liaocheng City, Shandong Province Development Zone Industrial Park, Contact: Manager Ge Building Material Co., Ltd. mainly produces Liaocheng Shunxiang variety of milling of cast iron, ductile iron pipe, flexible cast iron pipe fittings, cast iron pit wells and other premium quality of our products. Tensile strength (σb) samples during stretching, pull off when exposure to the most vigorous (Fb) seamless steel pipe, divided by the sample stress (σ) of the original cross-sectional area (So) obtained 40 # no pipe joints where cheap, known as the tensile strength (σb), the unit is 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 pipes 40 # seamless steel pipe inspection records, quality ductile iron pipe, flexible cast iron pipe fittings, cast iron pit wells quality of our products. Steel process performance test: ① flattening test: Round Sample C-shaped specimen (S / D> 0.15) H = (1 +2) S / (α + S / D) L = 40 ~ 100mm deformation coefficient per unit length = 0.07 ~ 0.08 ② ring pull test: L = 15mm crack for qualified ③ flaring and curling trials: Quill taper of 30 °, 40 °, 60 ° ④ bending test: can replace flattening test (for large diameter pipe terms)