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含>0.02％A1的低合金结构钢(17ΓIC)主要用于制造可焊输气管道,它在热变形时塑性降低。用这种钢制成的板坯和板材具有裂纹,龟裂,结疤等缺陷。形成这些缺陷的可能原因之一是在热轧时,沿变形晶界析出的氮化铝使钢变脆。钢中加入氮亲和力强的元素,例如钛,将减轻钢的裂纹敏感性,因为钛和大部分氮在高温时,甚至早在液相中就结合成稳定的氮化物。加入微量钛,可减少脱氧用铝量,还可减少保证钢机械性能所需铝含量,于是就使
Low-alloyed structural steels with> 0.02% A1 (17ΓIC) are mainly used to make weldable gas conduits, which reduce ductility on hot deformation. Slab and plate made from this steel have defects such as cracks, cracks and scarring. One of the possible reasons for the formation of these defects is that aluminum nitride precipitated along the grain boundaries during the hot rolling causes the steel to become brittle. Addition of nitrogen-rich elements, such as titanium, to steel will reduce the susceptibility to cracking of the steel because titanium and most of the nitrogen combine to form stable nitrides, even at high temperatures, even in the liquid phase. Addition of trace titanium can reduce the amount of aluminum deoxidation, but also reduce the aluminum content required to ensure the mechanical properties of steel, so that