S31803双相不锈钢管是属于耐氯化物应力良好的中合金型双相不锈钢。中合金型--代表牌号是UNS S31803（22Cr-5Ni-3Mo-0.15N）；S31803双相钢钢管在三种双相钢（2205双相不锈钢管、2507双相不锈钢管、S31803双相不锈钢无缝管）中应用 广泛。

S31803 duplex stainless steel pipe is a medium alloy duplex stainless steel with good chloride stress resistance. Medium alloy type -- the representative brand is UNS S31803 (22cr-5ni-3mo-0.15n); S31803 duplex steel pipe is most widely used in three kinds of duplex steel (2205 duplex stainless steel pipe, 2507 duplex stainless steel pipe and S31803 duplex stainless steel seamless pipe).