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高强度抗冷裂钢(简称CF钢),又称焊接无裂纹钢,这是指抗拉强度≥50公斤/毫米~2,焊前不需预热或焊前预热温度比一般同级强度钢要低仍不会产生焊接裂纹的钢。该类钢的特点是含碳量低(≤0.12%),焊接裂纹敏感性系数很小(P_(CM)≤0.25),通过加入微量合金元素诸如Ti、Nb和B等来保证基体和焊接接头达到足够的强度和冲击韧性。自二十世纪七十年代开始,日本,西德两国为了适应各种大型焊接结构减轻结构重量、降低成本,缩短建造周期的迫切要求,分别研制了这类能简化焊接
High-strength cold-cracked steel (referred to as CF steel), also known as welding crack-free steel, which refers to the tensile strength ≥ 50 kg / mm ~ 2, without preheating or preheating temperature before welding than the same level of intensity Low steel will not produce weld cracked steel. This type of steel is characterized by a low carbon content (≤ 0.12%), a small susceptibility to weld cracking (P_ (CM) ≤0.25) and the addition of trace alloying elements such as Ti, Nb and B to ensure matrix and weld joints Achieve sufficient strength and impact toughness. Since the 1970s, Japan and West Germany have, in order to meet the urgent requirements of various large-scale welded structures to reduce the weight of structures, reduce costs and shorten the construction period,