<p>3.2 热影响区晶粒长大 　　焊接热循环对焊接头热影响区的晶粒长大有重大的影响，特别是紧邻加热温度达到最高的熔合区。当冷却速度较小时，在焊接热影响区会出现粗大的块状铁素体和碳化物组织，使钢材的塑性明显下降；冷却速度大时，由于产生了粗大的马氏体组织，也会使焊接接头塑性下降。 　　3.3 软化层的产生 　　T91钢在调质状态下焊接，热影响区产生软化层不可避免，而且比珠光体耐热钢的软化更为严重。当用加热和冷却速度均较缓慢的规范时，软化程度较大。另外，软化层的宽度和它离熔合线的距离，不仅与焊接的加热条件及特点有关，还与预热、焊后热处理等有关。哈尔滨锅炉厂曾做过试验得出T91焊接热影响区硬度曲线，见图2。 　　3.4 应力腐蚀裂纹 　　T91钢在焊后热处理之前，冷却温度一般不低于100℃，如果在室温下冷却，而环境又比较潮湿时，容易出现应力腐蚀裂纹。德国规定：在焊后热处理之前必须冷却至150℃以下。在工件较厚、有角焊缝存在及几何尺寸不好的情况下，冷却温度不低于100℃。如果在室温下冷却，严禁潮湿，否则容易产生应力腐蚀裂纹。</p> <p>长沙 镀锌管 Ф26.8*2.75 Q195-235 广州 5630 - - <br /> 长沙 镀锌管 Ф26.8*2.75 Q195-235 衡水 5630 - - <br /> 长沙 镀锌管 Ф33.5*3.25 Q195-235 广州 5500 - - <br /> 长沙 镀锌管 Ф33.5*3.25 Q195-235 衡水 5500 - - <br /> 长沙 镀锌管 Ф48*3.5 Q195-235 广州 5290 - - <br /> 长沙 镀锌管 Ф48*3.5 Q195-235 衡水 5290 - - <br /> 长沙 镀锌管 Ф77.5*3.75 Q195-235 广州 5220 - - </p> <p>公司的产品有三分之一出口国外，主要国家有俄罗斯、日本、韩国、印度、巴基斯坦等。在质量上受到外商的认可。<br /> 公司下设有色金属研究机构，主要从事研究航天用钛合金、钛材在造船业的应用。复合材料领域：钛钢、镍钢、<a style="word-spacing:0px;font:medium Simsun;text-transform:none;text-indent:0px;white-space:normal;letter-spacing:normal;background-color:#ffffff;orphans:2;widows:2;webkit-text-size-adjust:auto;webkit-text-stroke-width:0px;" href="http://www.tjwffg.com/">厚壁方管</a><span style="display:inline! 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