Join chrome mainly to improve the oxidation resistance of heat-resistant steel, corrosion resistance, chromium content of less than 5%, beginning 600 ℃ vigorous oxidation Shanghai t91 alloy tube, while chromium amounted to 5% when it has good resistance to oxidation . 12Cr1MoV below 580 ℃ steel has good resistance to oxidation, corrosion depth of 0.05 mm / a, 600 ℃ when the performance begins to deteriorate import t91 alloy pipe, corrosion depth of 0.13 mm / a. T91 chromium content increased to about 9%, temperature can reach 650 ℃ t91 alloy tube manufacturers, the main measure is a solution of the matrix more chrome. Welding thermal cycle of grain heat-affected zone of welded joints have a significant impact grew t91, especially close to the heating temperature is the highest fusion zone. When the cooling rate is small, in the HAZ will appear coarse massive ferrite and carbide structure, the plastic steel decreased; the cooling rate is large, due to the generation of coarse martensite, but also make welded joints decreased plasticity. Shanghai t91 alloy tube, Florida t91, Katherine source of steel provided by source Pipe Co., Ltd. Liaocheng trillion. Liaocheng Katherine source Pipe Co., Ltd. (www.lczygg.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Katherine source of innovative ideas will lead pipe and you work into the brilliant, for a better future!