As the 45 # precision steel pipe inside and outside the wall without oxidation layer, to withstand high pressure without leakage, high precision, high finish, cold bending is not deformed, flaring, flattening no cracks and so a little, so mainly used to produce pneumatic or hydraulic components of the product, such as Cylinder or cylinder, can be seamless pipe, but also welded pipe. 45 # chemical composition of fine steel pipe carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium Cr.

45 # precision steel pipe is a mixture of carbon and some elements containing iron, zinc and some iron elements such as the composition of the composition, after the completion of processing is very bright, but for some reason, seamless steel pipe is It is easy to react with the gas in the air lead to corrosion, this gas is hydrogen sulfide, we first look at the gas.

1, hydrogen sulfide is an inorganic compound, chemical formula H 2 S. Under normal circumstances is a colorless, flammable acid gas, low concentration with stench, smell like a bad egg; high concentration but no smell (because the high concentration of hydrogen sulfide can paralyze the olfactory nerve). It can be dissolved in water, 0 ° C when 1 mole of water can dissolve about 2.6 moles of hydrogen sulfide.

2, hydrogen sulfide aqueous solution called hydrogen sulphate, is a weak acid, when it is heated, hydrogen sulfide escape from the water. Hydrogen sulfide is an acute and highly toxic, inhalation of a small amount of high concentrations of hydrogen sulfide can be fatal in a short time. Low concentrations of hydrogen sulfide on the eye, respiratory system and the central nervous system have an impact, hydrogen sulfide on the ordinary cold-drawn seamless steel pipe without corrosion.