Formula of super duplex stainless steel pump shell

• Main Author: ZHOU FANGJIE
• Format: Patent
• Language: Chinese; English
• Published: 02.04.2019
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a formula of a super duplex stainless steel pump shell and belongs to the technical field of smelting mold casting related to smelting of duplex stainless steel in a non-vacuum medium-frequency induction furnace. The formula comprises the ingredients including, by mass, no more than 0.03% of C, 0.60%-0.90% of Si, 0.50%-0.80% of Mn, no more than 0.03% of P, no more than 0.025% of S, 25.2%-25.7% of Cr, 6.7%-7.2% of Ni, 3.4%-3.7% of Mo, 0.6%-0.8% of Cu, 0.7%-0.9% of W and 0.20%-0.24% of N. The formula disclosed by the invention is applied to precision castings of ship pump shells, breaks through the technical puzzle that existing non-vacuum medium-frequency induction furnaces cannot normally produce super duplex stainless steel precision castings and can be used to produce the precision castings of the ship pump shells with good mechanical properties. 本发明涉及种超级双向不锈钢泵壳的配方，属于非真空中频感应电炉熔炼双相不锈钢熔模铸造技术领域。其配方比例按质量百分比计如下：C：≦0.03%、Si：0.60-0.90%、Mn：0.50-0.80%、P：≦0.03%、S：≦0.025%、Cr：25.2-25.7%、Ni：6.7-