聚氯乙烯及屏幕上

All the steel line pipes are produced mainly according to API Spec 5L , API Spec 5CT, API Spec 5B, EN10217, GB/T9711.1 and GB/T9711.2 standards. And the material adopts J55,N80,Q235, Q345, 10#, 20#, 16mn, L245, L290, L360,X42-X70. Our products widely uses in the electric power, the thermal energy, offshore oil piling, chemicals, water supply , transporting natural gas, petrol , piling, building bridge, steel structures, and other engineering fields.Meanwhile, we can supply steel line pipe with couplings. Main quality index of steel line pipe: IndexAPI 5L PSL1Line pipeO.D Tolerances of pipe Body mmD<60.3 -0.8 +0.4mm 60.3≤D≤168.3 ≤±0.75% 168.3<D≤610 ≤±0.75% or ≤±3.2mm,Use minimum valve. 610<D≤1422 ≤±0.5%D or≤±4.0mm, use minimum valve. D>1422 as per agreement between the purchaser and the manufacturer O.D Tolerances of pipe ends mm D≤168.3 -0.4 +1.6mm 168.3<D≤610 ≤±0.5% or ≤±1.6mm,Use minimum valve. 610<D≤1422 ≤±1.6mm D>1422, as per agreement between the purchaser and the manufacturer Tolerances of Wall Thickness mmT≤5.0 ≤±0.5 5.0<T<15.0 ≤±0.1T T≥15.0 ≤±1.5 Tolerances of WeightSingle length:-3.5% +10% ≥18t Carload weights or order weights: ≤-1.75% Hydrostatic Pressure TestEach length of welded steel pipes shall be hydrostatically tested, D≤457mm,Time holding test pressure≥5 seconds D>457mm,Time holding test pressure≥10 seconds Non-destructive inspectionThe full length(100%) of welded seam shall be ultrasonically inspected on line. After each length of welded pipes is hydrostatically tested,the ultimate 200mm length of weld seam at both ends of each pipe shall be inspected by manual ultrasonic method. Heat TreatmentAnalog normalization for the weld beads shall be conducted on line or rolled and normalized hot-rolled coils. StandardsGradeTensile propertiesYield strengthRt0.5MPaTensile strengthRmMPaElongationAf%Tensile strength of Weld SeamRm MPaMinMaxMinMaxMinminAPI 5L(PSL 1)B/L245X42/L290X46/L320X52/L360X56/L390X60/L415X65/L450245290320360390415450 ------ ------ ---- ------ ------ ------ ------ 415415435460490520535 ------- ------ ---- ------ ------ ------ ----- Af=1944A0.2/U0.9(Lo=50.8mm)415415435460490520535