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S355J0钢是欧洲结构钢标准中的一种典型钢种,在国外常作为一种低合金高强度结构钢广泛用于制造各类结构件。本钢在对S355J0钢板进行冲击性能检验时发现部分产品合格率偏低。通过利用金相显微镜、扫描电镜等检测手段,对冲击韧性良好与较差的两种S355J0钢板试样进行显微组织与夹杂物的分析,找出造成S355J0在0℃冲击性能偏低的主要原因。结果表明:钢中夹杂物、异常组织及冷却不均是造成S355J0冲击性能不合格的主要原因。本钢通过优化炼钢和热轧生产工艺改善了S355J0的冲击性能,产品性能合格率显著提高。
S355J0 steel is a typical steel in the European structural steel standards, often abroad as a low-alloy high-strength structural steel is widely used in the manufacture of various types of structural parts. Benxi Iron and Steel S355J0 plate in the impact of performance testing found that some products pass rate is low. Through the use of metallographic microscope, scanning electron microscopy and other detection methods, good and poor impact toughness of the two S355J0 steel samples were analyzed microstructures and inclusions, resulting in S355J0 at 0 ℃ low impact performance of the main reasons . The results show that inclusions in steel, abnormal structure and uneven cooling are the main reasons for the unacceptable impact performance of S355J0. Bengang improved the impact performance of S355J0 by optimizing the steel-making and hot-rolling production processes, resulting in a significant increase in the passing rate of product performance.