摘要
X70管线钢的微观组织表现为多种类型混合组织 ,主要有多边形铁素体、块状铁素体 (准多边形铁素体 )、针状铁素体、粒状贝氏体、珠光体和 M/ A岛等。各类组织的比例随加工工艺不同变化较大。提高冷却速度和降低终冷温度可以增加针状铁素体的比例。冷却速度较低 ( 2℃ / s)时 ,组织中出现明显的珠光体。
The microstructure of X70 pipeline steel shows many types of mixture structure, mainly including polygon ferrite, massive ferrite(same as polygon ferrite), acicular ferrite, grain bainite, pearlite and M/A islands etc.. The ratio of each structure greatly changes with different processing. The ratio of acicular ferrite may increase by raising cooling speed and decreasing final cooling temperature. Pearlite obviously occurs in the structure under lower cooling speed(2℃/s).
出处
《鞍钢技术》
CAS
2004年第5期21-25,共5页
Angang Technology
