2205圆钢#双相耐腐蚀性不锈钢2205复式不锈钢

Chromium duplex stainless steel 2205 alloy is by 21%, 2.5% nitrogen and 4.5% molybdenum nickel alloy consisting of duplex stainless steel. It has high strength, good impact toughness and good stress corrosion resistance of global and local ability. 2205 duplex stainless steel yield strength is twice that of austenitic stainless steel, this feature makes the designer when designing products lose weight, make this alloy is better than 316317 L have price advantage. This alloy is particularly suited to - + 50 ° F / 600 ° F temperature range. Beyond the temperature range of application, also can consider this kind of alloy, but there are some limitations, especially when applied to the welding structure. Duplex stainless steel 2205 alloy and 316 l and 317 l austenitic stainless steel, compared to 2205 alloy in the resistance to pitting corrosion and crevice corrosion of superior performance, it has high corrosion resistance, compared with the austenitic, its lower thermal expansion coefficient, thermal conductivity is higher.

双相不锈钢2205合金与奥氏体不锈钢相比,它的耐压强度是其两倍,与316L和317L相比,设计者可以减轻其重量。2205合金特别适用于—50°F/+600°F温度范围内,在严格限制的情况下(尤其对于焊接结构),也可以用于更低的温度。

化学成分：C≤0.030 Mn≤2.00 Si≤1.00 p≤0.030 S≤0.020 Cr 22.0～23.0 Ni 4.5～6.5 Mo3.0～3.5 N0.14～0.20(奥氏体-铁素体型）机械性能：

钢 号SAF2205  热处理制度℃1025-1100水淬  抗拉强度σb (Mpa)≥620 抗拉强度σs(Mpa)≥450  伸长率/δ%≥25  布氏硬度≤290  洛氏30.5

应用领域：压力器皿、高压储藏罐、高压管道、热交换器(化学加工工业)。石油天然气管道、热交换器管件。污水处理系统。纸浆和造纸工业分类器、漂白设备、贮存处理系统。

高强度耐腐蚀环境下的回转轴、压榨辊、叶片、叶轮等。 轮船或卡车的货物箱。 

抗应力腐蚀：

　　不锈钢的双相微观结构有助于提高不锈钢的抗应力腐蚀龟裂能力。在一定的温度、应张力、氧气及氯化物存在的情况下,奥氏体不锈钢会发生氯化物应力腐蚀。由于这些条件不易控制，因此304L、316L和317L的使用在这方面受到限制。