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工业化试制了3种厚度规格(20,26和36mm)的新型低成本高焊接性能船板钢EH36。试制钢板的显微组织由多边形铁素体和针状铁素体构成,其力学性能满足EH36级别船板要求并具有优异的低温韧性。采用焊接热模拟评价了钢板的焊接性能,当热输入由30kJ/cm升高至160kJ/cm时,粗晶区原奥氏体晶粒尺寸逐渐增大,其组织也逐渐由粒状贝氏体向晶界铁素体+晶内针状铁素体+晶内多边形铁素体转变,维氏硬度逐渐下降,低温韧性优异。得益于TiN粒子对奥氏体晶粒长大的抑制作用,微量B元素对先共析铁素体转变的抑制作用以及BN粒子对晶内铁素体形核的促进作用,焊接粗晶区获得了有利于韧性的细化组织,保证了粗晶区具有优异的低温韧性。双丝埋弧焊试验也验证了钢板具有优异的焊接性能。
Industrialization A new low cost, high weldability shipboard steel EH36 with 3 gauge sizes (20, 26 and 36 mm) was trialled. The microstructure of the trial steel plate is composed of polygonal ferrite and acicular ferrite. Its mechanical properties meet the requirements of EH36 grade shipbuilding plate and have excellent low temperature toughness. The welding performance of the steel was evaluated by the welding heat simulation. As the heat input increased from 30kJ / cm to 160kJ / cm, the original austenite grain size gradually increased and the microstructure gradually changed from granular bainite Grain boundary ferrite + intragranular acicular ferrite + intragranular polygonal ferrite transformation, Vickers hardness gradually decreased, excellent low temperature toughness. Due to the inhibitory effect of TiN particles on austenite grain growth, the inhibitory effect of trace B elements on the transformation of proeutectoid ferrite and the promoting effect of BN particles on the nucleation of intragranular ferrite, The refinement of the structure is conducive to toughness, to ensure that the coarse grain region has excellent low temperature toughness. Double wire submerged arc welding test also verified the plate has excellent welding performance.