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双相不锈钢与奥氏體(tǐ)以及铁素體(tǐ)不锈钢的比较

日期:2024-04-25 08:12
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摘要:<p align="left" style="margin:0pt;"> <span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><span style="font-family:宋體(tǐ);">双相不锈钢与奥氏體(tǐ)以及铁素體(tǐ)不锈钢的比较</span></span> </p> <p align="left" style="margin:0pt;"> <span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><span style="font-family:宋體(tǐ);">所谓双相不锈钢是在其固淬组织中铁素體(tǐ)相与奥氏體(tǐ)相各占一半,一般*少相的含量也许要达到</span>30%<span style="font-family:宋體(tǐ);">。</span><span style="font-family:Calibri;">&nbsp;</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-family:宋體(tǐ);">由于两相组织的特点,通过正确控制化學(xué)成分(fēn)和热处理(lǐ)工艺,使</span><span style="font-family:Calibri;">DSS</span><span style="font-family:宋體(tǐ);">兼有(yǒu)铁素體(tǐ)不锈钢和奥氏體(tǐ)不锈钢的优点。</span></span> </p> <p align="left" style="margin:0pt;"> <span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp; &nbsp;<span style="font-family:宋體(tǐ);">与奥氏體(tǐ)不锈钢相比,双相不锈钢的优势如下:</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; <span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">1</span><span style="font-family:宋體(tǐ);">)屈服强度比普通奥氏體(tǐ)不锈钢高一倍多(duō),且具有(yǒu)成型需要的足够的塑韧性。采用(yòng)双相不锈钢制造储罐或压力容器的壁厚要比常用(yòng)的奥氏體(tǐ)减少</span><span style="font-family:Calibri;">30-50%</span><span style="font-family:宋體(tǐ);">,有(yǒu)利于降低成本。</span><span style="font-family:Calibri;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; <span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">2</span><span style="font-family:宋體(tǐ);">)具有(yǒu)优异的耐应力腐蚀破裂的能(néng)力,即使是含合金量*低的双相不锈钢也有(yǒu)比奥氏體(tǐ)不锈钢更高的耐应力腐蚀破裂的能(néng)力,尤其在含氯离子的环境中。应力腐蚀是普通奥氏體(tǐ)不锈钢难以解决的突出问题。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp;<span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">3</span><span style="font-family:宋體(tǐ);">)在许多(duō)介质中应用(yòng)*普遍的</span><span style="font-family:Calibri;">2205</span><span style="font-family:宋體(tǐ);">双相不锈钢的耐腐蚀性优于普通的</span><span style="font-family:Calibri;">&nbsp;</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp; 316L<span style="font-family:宋體(tǐ);">奥氏體(tǐ)不锈钢,而超级双相不锈钢具有(yǒu)极高的耐腐蚀性,再一些介质中,如醋酸,甲酸等甚至可(kě)以取代高合金奥氏體(tǐ)不锈钢,乃至耐蚀合金。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp;<span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">4</span><span style="font-family:宋體(tǐ);">)具有(yǒu)良好的耐局部腐蚀性能(néng),与合金含量相当的奥氏體(tǐ)不锈钢相比,它的耐磨损腐蚀和疲劳腐蚀性能(néng)都优于奥氏體(tǐ)不锈钢。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; <span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">5</span><span style="font-family:宋體(tǐ);">)比奥氏體(tǐ)不锈钢的線(xiàn)膨胀系数低,和碳钢接近,适合与碳钢连接,具有(yǒu)重要的工程意义,如生产复合板或衬里等。</span><span style="font-family:Calibri;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp;<span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">6</span><span style="font-family:宋體(tǐ);">)不论在动载或静载条件下,比奥氏體(tǐ)不锈钢具有(yǒu)更高的能(néng)量吸收能(néng)力,这对结构件应付突发事故如冲撞,爆炸等,双相不锈钢优势明显,有(yǒu)实际应用(yòng)价值。</span></span> </p> <p align="left" style="margin:0pt;"> <span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp;<span style="font-family:宋體(tǐ);">与奥氏體(tǐ)不锈钢相比,双相不锈钢的弱势如下:</span></span> </p> <p align="left" style="margin:0pt;"> <span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp;<span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">1</span><span style="font-family:宋體(tǐ);">)应用(yòng)的普遍性与多(duō)面性不如奥氏體(tǐ)不锈钢,例如其使用(yòng)温度必须控制在</span><span style="font-family:Calibri;">250</span><span style="font-family:宋體(tǐ);">摄氏度以下。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp; <span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">2</span><span style="font-family:宋體(tǐ);">)其塑韧性较奥氏體(tǐ)不锈钢低,冷,热加工工艺和成型性能(néng)不如奥氏體(tǐ)不锈钢。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp; <span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">3</span><span style="font-family:宋體(tǐ);">)存在中温脆性區(qū),需要严格控制热处理(lǐ)和焊接的工艺制度,以避免有(yǒu)害相的出现,损害性能(néng)。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp; &nbsp; &nbsp; <span style="font-family:宋體(tǐ);">与铁素體(tǐ)不锈钢相比,双相不锈钢的优势如下:</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">1</span><span style="font-family:宋體(tǐ);">)综合力學(xué)性能(néng)比铁素體(tǐ)不锈钢好,尤其是塑韧性,不象铁素體(tǐ)不锈钢那样对脆性敏感。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">2</span><span style="font-family:宋體(tǐ);">)除耐应力腐蚀性能(néng)外,其他(tā)耐局部腐蚀性能(néng)都优于铁素體(tǐ)不锈钢。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp;<span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">3</span><span style="font-family:宋體(tǐ);">)冷加工工艺性能(néng)和冷成型性能(néng)遠(yuǎn)优于铁素體(tǐ)不锈钢。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;">&nbsp;<span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">4</span><span style="font-family:宋體(tǐ);">)焊接性能(néng)也遠(yuǎn)优于铁素體(tǐ)不锈钢,一般焊前不需预热,焊后不需热处理(lǐ)。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><span style="font-family:宋體(tǐ);">(</span><span style="font-family:Calibri;">5</span><span style="font-family:宋體(tǐ);">)应用(yòng)范围较铁素體(tǐ)不锈钢宽。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><span style="font-family:宋體(tǐ);">与铁素體(tǐ)不锈钢相比,双相不锈钢的弱势如下:</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><span style="font-family:宋體(tǐ);">合金元素含量高,价格相对高,一般铁素體(tǐ)不含镍。</span></span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><br /> </span><span style="font-family:宋體(tǐ);font-size:10.5pt;mso-spacerun:&quot;yes&quot;;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-font-kerning:1.0000pt;"><span style="font-family:宋體(tǐ);">综上所述,可(kě)以概括地看出</span><span style="font-family:Calibri;">DSS</span><span style="font-family:宋體(tǐ);">的使用(yòng)性能(néng)和工艺性能(néng)的概貌,它以其优越的力學(xué)与耐腐蚀综合性能(néng)赢得了使用(yòng)者的青睐,已成為(wèi)既节省重量又(yòu)节省投资的优良的耐蚀工程材料。</span></span> </p>

双相不锈钢与奥氏體(tǐ)以及铁素體(tǐ)不锈钢的比较

所谓双相不锈钢是在其固淬组织中铁素體(tǐ)相与奥氏體(tǐ)相各占一半,一般*少相的含量也许要达到30% 
        由于两相组织的特点,通过正确控制化學(xué)成分(fēn)和热处理(lǐ)工艺,使DSS兼有(yǒu)铁素體(tǐ)不锈钢和奥氏體(tǐ)不锈钢的优点。

       与奥氏體(tǐ)不锈钢相比,双相不锈钢的优势如下:
                      
    1)屈服强度比普通奥氏體(tǐ)不锈钢高一倍多(duō),且具有(yǒu)成型需要的足够的塑韧性。采用(yòng)双相不锈钢制造储罐或压力容器的壁厚要比常用(yòng)的奥氏體(tǐ)减少30-50%,有(yǒu)利于降低成本。                
    2)具有(yǒu)优异的耐应力腐蚀破裂的能(néng)力,即使是含合金量*低的双相不锈钢也有(yǒu)比奥氏體(tǐ)不锈钢更高的耐应力腐蚀破裂的能(néng)力,尤其在含氯离子的环境中。应力腐蚀是普通奥氏體(tǐ)不锈钢难以解决的突出问题。
     3)在许多(duō)介质中应用(yòng)*普遍的2205双相不锈钢的耐腐蚀性优于普通的 
      316L奥氏體(tǐ)不锈钢,而超级双相不锈钢具有(yǒu)极高的耐腐蚀性,再一些介质中,如醋酸,甲酸等甚至可(kě)以取代高合金奥氏體(tǐ)不锈钢,乃至耐蚀合金。
     4)具有(yǒu)良好的耐局部腐蚀性能(néng),与合金含量相当的奥氏體(tǐ)不锈钢相比,它的耐磨损腐蚀和疲劳腐蚀性能(néng)都优于奥氏體(tǐ)不锈钢。
    5)比奥氏體(tǐ)不锈钢的線(xiàn)膨胀系数低,和碳钢接近,适合与碳钢连接,具有(yǒu)重要的工程意义,如生产复合板或衬里等。                   
     6)不论在动载或静载条件下,比奥氏體(tǐ)不锈钢具有(yǒu)更高的能(néng)量吸收能(néng)力,这对结构件应付突发事故如冲撞,爆炸等,双相不锈钢优势明显,有(yǒu)实际应用(yòng)价值。


     与奥氏體(tǐ)不锈钢相比,双相不锈钢的弱势如下:

     1)应用(yòng)的普遍性与多(duō)面性不如奥氏體(tǐ)不锈钢,例如其使用(yòng)温度必须控制在250摄氏度以下。
      2)其塑韧性较奥氏體(tǐ)不锈钢低,冷,热加工工艺和成型性能(néng)不如奥氏體(tǐ)不锈钢。
      3)存在中温脆性區(qū),需要严格控制热处理(lǐ)和焊接的工艺制度,以避免有(yǒu)害相的出现,损害性能(néng)。
      与铁素體(tǐ)不锈钢相比,双相不锈钢的优势如下:
1)综合力學(xué)性能(néng)比铁素體(tǐ)不锈钢好,尤其是塑韧性,不象铁素體(tǐ)不锈钢那样对脆性敏感。
2)除耐应力腐蚀性能(néng)外,其他(tā)耐局部腐蚀性能(néng)都优于铁素體(tǐ)不锈钢。
 3)冷加工工艺性能(néng)和冷成型性能(néng)遠(yuǎn)优于铁素體(tǐ)不锈钢。
 4)焊接性能(néng)也遠(yuǎn)优于铁素體(tǐ)不锈钢,一般焊前不需预热,焊后不需热处理(lǐ)。
5)应用(yòng)范围较铁素體(tǐ)不锈钢宽。
与铁素體(tǐ)不锈钢相比,双相不锈钢的弱势如下:
合金元素含量高,价格相对高,一般铁素體(tǐ)不含镍。
综上所述,可(kě)以概括地看出DSS的使用(yòng)性能(néng)和工艺性能(néng)的概貌,它以其优越的力學(xué)与耐腐蚀综合性能(néng)赢得了使用(yòng)者的青睐,已成為(wèi)既节省重量又(yòu)节省投资的优良的耐蚀工程材料。