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Q345B无缝钢管裂纹原因与常用执行标准Q345B无缝钢管裂纹原因组织的不均匀是管坯的原因。Mn是以前钢的牌号，早就改为Q345B了，这没什么关系，注意选择执行管坯标准的，有一定规模的厂家生产的圆钢就行。第二成品退火温度是合适的。穿孔加热温度118~123℃，偏低，这是中碳合金钢的温度，取123-125，才合适。min是加热时间还是炉内时间？炉内时间一般在6min以上。第三，裂纹产生的原因，经试验证明，管坯（圆钢）的原因居多，内部含有较多的裂纹、夹杂、气包等。
