2507不锈钢无缝管的化学成分及性能特点

摘要：<p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢无缝管的化学成分及性能特点</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢无缝管是一种铁素体</span><span style="font-family:Calibri;">-</span><span style="font-family:宋体;">奥氏体</span><span style="font-family:Calibri;">(</span><span style="font-family:宋体;">双相</span><span style="font-family:Calibri;">)</span><span style="font-family:宋体;">不锈钢化学成分（</span><span style="font-family:Calibri;">25Cr-7Ni-4Mo-0.27N</span><span style="font-family:宋体;">）</span><span style="font-family:Calibri;">2507 Stainless steel</span><span style="font-family:宋体;">，具有极好的抗点腐蚀</span><span style="font-family:Calibri;">,</span><span style="font-family:宋体;">缝隙腐蚀和均匀腐蚀的能力。</span><span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢无缝管</span><span style="font-family:宋体;">是一种铁素体</span><span style="font-family:Calibri;">-</span><span style="font-family:宋体;">奥氏体</span><span style="font-family:Calibri;">(</span><span style="font-family:宋体;">双相</span><span style="font-family:Calibri;">)</span><span style="font-family:宋体;">不锈钢，它综合了许多铁素体钢和奥氏体钢*有益的性能</span><span style="font-family:Calibri;">, </span><span style="font-family:宋体;">由于该钢铬和钼的含量都很高</span><span style="font-family:Calibri;">,</span><span style="font-family:宋体;">因此具有极好的抗点腐蚀，缝隙腐蚀和均匀腐蚀的能力。双相显微组织保证了该钢具有很高的抗应力腐蚀破裂的能力，而且机械强度也很高。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢无缝管的主要用途：</span><span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢应用于石油和天然气工业；海上石破天油平台</span><span style="font-family:Calibri;">(</span><span style="font-family:宋体;">热交换器管，水处理和供水系统，消防系统</span><span style="font-family:Calibri;">,</span><span style="font-family:宋体;">喷水系统，稳水系统；石油化工设备；脱盐</span><span style="font-family:Calibri;">(</span><span style="font-family:宋体;">淡化</span><span style="font-family:Calibri;">)</span><span style="font-family:宋体;">设备</span><span style="font-family:Calibri;">(</span><span style="font-family:宋体;">和设备中的高压管，海水管</span><span style="font-family:Calibri;">)</span><span style="font-family:宋体;">；既需要高强度同时又需要高耐腐蚀性的机械和结构部件；燃</span><span style="font-family:Calibri;">(</span><span style="font-family:宋体;">废</span><span style="font-family:Calibri;">)</span><span style="font-family:宋体;">气净化设备。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢无缝管主要成分</span><span style="font-family:Calibri;">:25Cr-7Ni-4Mo-0.27N</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢无缝管各国标准对照</span><span style="font-family:Calibri;">:</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">ASTM/ASME:&nbsp; A240 - UNS S32750</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">EURONORM:&nbsp; 1.4410 - X2 Cr Ni MoN 25.7.4</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">AFNOR: Z3 CN 25.06 Az</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">DIN/EN</span><span style="font-family:宋体;">： </span><span style="font-family:Calibri;">1.4410</span><span style="font-family:宋体;">、</span><span style="font-family:Calibri;">ASME SA-240</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">GB:&nbsp; 25Cr-7Ni-4Mo-0.27N</span><o:p></o:p> </p> <p class="MsoNormal"> 抗腐蚀能力<o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">1.</span><span style="font-family:宋体;">一般腐蚀：</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">SAF 2507</span><span style="font-family:宋体;">的较高的铬及钼含量使其对有机酸如甲酸、乙酸等具有较强的抗整体腐蚀的能力。</span><span style="font-family:Calibri;">SAF2507</span><span style="font-family:宋体;">合合金对无机酸，尤其是那些包含氯化物的无机酸也具有较强的抗腐蚀能力。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">和</span><span style="font-family:Calibri;">904L</span><span style="font-family:宋体;">相比，</span><span style="font-family:Calibri;">SAF2507</span><span style="font-family:宋体;">对稀释的混有氯根离子的硫酸具有更强的抗腐蚀能力。</span><span style="font-family:Calibri;">904L</span><span style="font-family:宋体;">是奥氏体状态的合金，专用于抗纯硫酸腐蚀。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">316L</span><span style="font-family:宋体;">等级不能用于盐酸环境中，它可能会遭到局部腐蚀或整体腐蚀。</span><span style="font-family:Calibri;">SAF2507</span><span style="font-family:宋体;">可以用于稀释的盐酸环境里，具有较强的抗斑损及抗裂隙腐蚀的能力。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2.</span><span style="font-family:宋体;">晶间腐蚀：</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">nSAF 2507</span><span style="font-family:宋体;">较低的碳含量大大地降低了在热处理时晶间中的碳化物沉淀的风险</span><span style="font-family:Calibri;">,</span><span style="font-family:宋体;">因此</span><span style="font-family:Calibri;">,</span><span style="font-family:宋体;">这个合金具有很强的抵抗与碳化物相关的晶间腐蚀的能力</span><span style="font-family:Calibri;">.</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">3.</span><span style="font-family:宋体;">应力腐蚀开裂：</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">SAF 2507</span><span style="font-family:宋体;">的复式结构使其具有较强的抗应力腐蚀开裂的能力。由于其较高的合金含量</span><span style="font-family:Calibri;">,SAF 2507</span><span style="font-family:宋体;">的抗腐蚀能力及强度均优于</span><span style="font-family:Calibri;">2205.</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">裂缝在建筑等方面几乎是不可避免的</span><span style="font-family:Calibri;">,</span><span style="font-family:宋体;">这使得不锈钢在氯化物的环境里更易受到腐蚀</span><span style="font-family:Calibri;">.SAF 2507 </span><span style="font-family:宋体;">具有很强的抗裂缝腐蚀的能力</span><span style="font-family:Calibri;">.SAF 2507</span><span style="font-family:宋体;">在含有</span><span style="font-family:Calibri;">2000ppm</span><span style="font-family:宋体;">氯离子的硫酸中的等腐蚀曲线</span><span style="font-family:Calibri;">0.1 mm/year;</span><span style="font-family:宋体;">在盐酸中的等腐蚀曲线</span><span style="font-family:Calibri;">0.1 mm/year.</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">机械特性</span><span style="font-family:Calibri;">:SAF 2507</span><span style="font-family:宋体;">具有很高的耐压强度、冲击强度及较低的热膨胀系数和较高的导热性</span><span style="font-family:Calibri;">.</span><span style="font-family:宋体;">这些特性适用于很多结构零件及机械部件</span><span style="font-family:Calibri;">.SAF 2507</span><span style="font-family:宋体;">冲击强度很高</span><span style="font-family:Calibri;">,</span><span style="font-family:宋体;">不宜长期置于高于</span><span style="font-family:Calibri;">570</span><span style="font-family:宋体;">°</span><span style="font-family:Calibri;">F</span><span style="font-family:宋体;">的温度环境下</span><span style="font-family:Calibri;">,</span><span style="font-family:宋体;">这样可能会减弱其韧性</span><span style="font-family:Calibri;">.</span><span style="font-family:宋体;">抗拉强度</span><span style="font-family:Calibri;">:</span><span style="font-family:宋体;">σ</span><span style="font-family:Calibri;">b</span><span style="font-family:宋体;">≥</span><span style="font-family:Calibri;">730Mpa;</span><span style="font-family:宋体;">延伸率</span><span style="font-family:Calibri;">:</span><span style="font-family:宋体;">δ≥</span><span style="font-family:Calibri;">20%</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">配套焊材</span><span style="font-family:Calibri;">:ER2594</span><span style="font-family:宋体;">焊丝，</span><span style="font-family:Calibri;">E2594</span><span style="font-family:宋体;">焊条</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">应用领域</span><span style="font-family:Calibri;">:</span><span style="font-family:宋体;">纸浆和造纸工业，海水淡化，烟气净化，热交换器，化学品液货船管道系统，海水系统等。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢主要规格：</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢板材现货规格</span><span style="font-family:Calibri;">:0.3mm-350mm(</span><span style="font-family:宋体;">厚度</span><span style="font-family:Calibri;">)</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢棒材现货规格</span><span style="font-family:Calibri;">:3.0mm-500mm(</span><span style="font-family:宋体;">直径</span><span style="font-family:Calibri;">)</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢线材现货规格</span><span style="font-family:Calibri;">:0.1mm-20mm(</span><span style="font-family:宋体;">线径</span><span style="font-family:Calibri;">)</span><o:p></o:p> </p> <p class="MsoNormal"> &nbsp; </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢的化学成分</span><span style="font-family:Calibri;">:</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">C</span><span style="font-family:宋体;">≤</span><span style="font-family:Calibri;">0.03 </span><span style="font-family:宋体;">、</span><span style="font-family:Calibri;">Si</span><span style="font-family:宋体;">≤</span><span style="font-family:Calibri;">0.80 </span><span style="font-family:宋体;">、</span><span style="font-family:Calibri;">Mn</span><span style="font-family:宋体;">≤</span><span style="font-family:Calibri;">1.2 </span><span style="font-family:宋体;">、</span><span style="font-family:Calibri;">Cr:24-26 </span><span style="font-family:宋体;">、</span><span style="font-family:Calibri;">Ni:6-8 </span><span style="font-family:宋体;">、</span><span style="font-family:Calibri;">S</span><span style="font-family:宋体;">≤</span><span style="font-family:Calibri;">0.02 </span><span style="font-family:宋体;">、</span><span style="font-family:Calibri;">P</span><span style="font-family:宋体;">≤</span><span style="font-family:Calibri;">0.035 </span><span style="font-family:宋体;">、</span><span style="font-family:Calibri;">Mo:3-5 </span><span style="font-family:宋体;">、</span><span style="font-family:Calibri;">N:0.24-0.32</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢无缝管在适宜固溶处理后，此钢的显微组织有比较理想的α</span><span style="font-family:Calibri;">/</span><span style="font-family:宋体;">γ之比约为</span><span style="font-family:Calibri;">50/50</span><span style="font-family:宋体;">的双相结构。当固溶温度在</span><span style="font-family:Calibri;">1050</span><span style="font-family:宋体;">℃以上时，随温度升高，钢中铁素体相数量会有所增加，但由于含氮量高，在</span><span style="font-family:Calibri;">1300</span><span style="font-family:宋体;">℃以下刚的相比例不会有显著改变。此钢若不经不同温度时效</span><span style="font-family:Calibri;">(</span><span style="font-family:宋体;">或受热的影响</span><span style="font-family:Calibri;">)</span><span style="font-family:宋体;">，在α</span><span style="font-family:Calibri;">+</span><span style="font-family:宋体;">γ基体上会有γ</span><span style="font-family:Calibri;">2</span><span style="font-family:宋体;">形成和δ、χ、</span><span style="font-family:Calibri;">R</span><span style="font-family:宋体;">、α</span><span style="font-family:Calibri;">`</span><span style="font-family:宋体;">金属间相和</span><span style="font-family:Calibri;">Cr2N</span><span style="font-family:宋体;">等氧化物析出，由于钢中的碳含量低</span><span style="font-family:Calibri;">(</span><span style="font-family:宋体;">一般在</span><span style="font-family:Calibri;">0.01%-0.02%)</span><span style="font-family:宋体;">，因此钢中一般没有碳化物存在。</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢无缝管产品的力学性能</span><span style="font-family:Calibri;">:</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">一、</span><span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">不锈钢无缝管的室温力学性能</span><span style="font-family:Calibri;">:</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">钢材品种</span><span style="font-family:Calibri;">:&nbsp; &nbsp;</span><span style="font-family:宋体;">壁厚≤</span><span style="font-family:Calibri;">20mm ;</span><span style="font-family:宋体;">δ</span><span style="font-family:Calibri;">b/MPa:800-1000 </span><span style="font-family:宋体;">、δ</span><span style="font-family:Calibri;">0.2/MPa:</span><span style="font-family:宋体;">≥</span><span style="font-family:Calibri;">550 </span><span style="font-family:宋体;">、δ</span><span style="font-family:Calibri;">5/%:</span><span style="font-family:宋体;">≥</span><span style="font-family:Calibri;">25 </span><span style="font-family:宋体;">、硬度</span><span style="font-family:Calibri;">(HV):290</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">二、</span><span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">双相不锈钢板在室温</span><span style="font-family:Calibri;">--200</span><span style="font-family:宋体;">℃的力学性能</span><span style="font-family:Calibri;">:</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">钢材品种</span> 温度<span style="font-family:Calibri;">/</span><span style="font-family:宋体;">℃ δ</span><span style="font-family:Calibri;">b/MPa</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">室温</span> ≥<span style="font-family:Calibri;">530</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">板材</span> <span style="font-family:Calibri;">100 </span><span style="font-family:宋体;">≥</span><span style="font-family:Calibri;">450</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">200 </span><span style="font-family:宋体;">≥</span><span style="font-family:Calibri;">400</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">三、</span><span style="font-family:Calibri;">2507</span><span style="font-family:宋体;">大口径无缝管的力学性能</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋体;">外径</span>×壁厚 δ<span style="font-family:Calibri;">b/MPa </span><span style="font-family:宋体;">δ</span><span style="font-family:Calibri;">0.2/MPa </span><span style="font-family:宋体;">δ</span><span style="font-family:Calibri;">5/% </span><span style="font-family:宋体;">硬度</span><span style="font-family:Calibri;">(HV)</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">273.0mm</span><span style="font-family:宋体;">×</span><span style="font-family:Calibri;">4.19mm 894 644 40 284</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">323.9mm</span><span style="font-family:宋体;">×</span><span style="font-family:Calibri;">4.57mm 858 662 45 270</span><o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:Calibri;">406.4mm</span><span style="font-family:宋体;">×</span><span style="font-family:Calibri;">4.74mm 854 657 41 272</span><o:p></o:p> </p>