双相不锈钢2205
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宝钢双相不锈钢B2205
（Plate sheet and coil for duplex Stainless Steel B2205）
---------------------------------------------------------------------------------------------------------------------------------1、B2205概述Brief introduction of B2205
双相不锈钢B2205是由奥氏体和铁素体两相组成的双相不锈钢，具有优良的耐腐蚀性能和力学性能，其屈服强度是300系列不锈钢的两倍，被广泛应用于油气、石化、桥梁、海水淡化以及化学品船等行业。
Duplex stainless steel B2205is characterized by a ferrite-austenite microstructure,which leads to a good combination of corrosion resistance and mechanical properties.The yield strength of B2205is nearly twice as that of300series stainless steel.B2205is widely used in industry such as oil and gas, petrochemical,bridge,sea water desalinization,chemical cargo ship and so on.
图1双相不锈钢B2205典型组织
Figure1Typical microstructure of B2205
2、相关标准Related standards
●GB2437-2007022Cr22Ni5Mo3N、022Cr23Ni5Mo3N；
GB24511-2009S22253，S22053
●UNS S31803，S32205
●EN 1.4462
3、化学成分Chemical composition
表1B2205化学成分
Table1Chemical Composition of B2205
牌号Steel grade
标准号
International Standards
化学成分，wt％，典型值
Chemical composition,wt%,Typical values
C N Cr Ni Mo
B2205S318030.020.1621.5 5.3 2.8 S322050.020.1722 5.5 3.1
4、力学性能Mechanical properties
表2B2205退火态力学性能
Table2Mechanical properties of B2205in solution annealed state
牌号厚度（mm）
Thickness
力学性能典型值（Typical Mechanical Properties）
屈服强度(MPa)
Yield Strength
R p0.2
抗拉强度(MPa)
Tensile Strength
Rm
延伸率(%)
Elongation
硬度(HV)
Hardness
B2205P(15mm)55076846225 H(4mm)57081530230 C(0.6mm)62388930250
表3B2205退火态高温力学性能
Table3Mechanical properties at high temperature of B2205for solution annealed product 温度(℃)
最小值（Minimum values)典型值(Typical values) R0.2(MPa)Rm(MPa)EL(%)R0.2(MPa)Rm(MPa)EL(%) 1003706302545371737 1503456002543368335 2003305802240566532 2503205702039565829 3003105602037365528
50100150200
250300-200
-150-100-50050
Temperature(℃)
A k v (J )
图2不同温度下B2205的冲击功（试样尺寸10×10mm ，Charpy-V ）
Figure 2Typical impact strength at different temperature (Specimen size:10×10mm ，Charpy-V)
5、耐腐蚀性能Corrosion resistance
5.1耐点腐蚀性能Pitting corrosion resistance
图3按照ASTM G150测试获得的B2205临界点蚀温度（CPT ）
Figure 3Critical pitting temperature (CPT)of B2205measured according ASTM G150
表4按照ASTM A92306C 测试获得的B2205点腐蚀速率Table 4Pitting corrosion rate of B2205according ASTM A92306C
试验温度（℃）Testing temperature
试验时间（h ）Testing time
腐蚀率（mg/dm 2.day ）
Corrosion rate
B2205
25±1
24
1.21