Fertilizer pipe fertilizer equipment, high pressure seamless pipe [1] fertilizer tube (GB6479-2006) is applicable to operating temperature of -40 to 400 ° C, working pressure of 10 ~ 30Ma of chemical equipment and pipeline quality carbon structural steel and alloy steel seamless pipe. (GB/T699-1999) steel, quality carbon structural steel elements in addition to carbon (C) and deoxy contain a certain amount of silicon (Si) (generally not more than 0.40%), manganese (Mn) (generally not more than 0.80% higher to 1.20%) alloying elements, without other alloying elements (except for residual elements). This type of steel must also ensure that the chemical composition and mechanical properties. Sulfur (S), phosphorus (P) content of impurity elements ships controlled to 0.035% or less. If the control is less than 0.030% called high quality steel, the grade should be followed plus "A", for example, 20A; P control, S control less than 0.020% 0.025% said premium quality steel, the grade should be added later "E" to show the difference. For other residues from the raw material into steel alloying elements such as chromium (Cr), nickel (Ni), copper (Cu) content of the general control in the Cr ≤ 0.25%, Ni ≤ 0.30% Cu ≤ 0.25%. Some grades of manganese (Mn) content of 1.40%, which is called manganese steel.