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16MnRE钢作为炉壳在使用过程中,前4个炉役未发现裂纹,中修期扒炉检查,发现产生环形断裂而报废,仅使用7个月。裂纹断口为脆性断裂。钢材有明显的回火脆性,有较大的缺口敏感性,特别是钢板含碳量高强度高,焊接质量不好,熔合区有裂纹,焊肉有孔洞、裂纹,焊缝里有未熔化的焊条。经过冷卷曲和低温焊接,产生很大的潜在应力。炉壳在使用过程中,钢板厚,温差变化大,内壁和外壁收缩不均,应力逐渐增大,超过钢板强度极限,从薄弱点产生裂纹,当修炉打水,内壁和外壁温度梯度差大,收缩应力可达110kg/mm~2,大大超过了钢板强度,炉壳急剧断裂并扩展成环形断裂。
In the process of using 16MnRE steel as furnace shell, no crack was found in the first four furnaces, and the griddle inspection was carried out in the repair phase. The ring fracture was found and scrapped, only for 7 months. Fracture fracture brittle fracture. Steel has obvious temper brittleness, a greater gap sensitivity, in particular, high carbon steel high strength, poor welding quality, weld cracks, flesh holes, cracks, the weld has not melted welding rod. After cold curling and low temperature welding, a great potential stress. In the process of using the furnace shell, the thickness and the temperature difference of the steel plate vary greatly, and the shrinkage of the inner wall and the outer wall is uneven. The stress increases gradually and exceeds the strength limit of the steel plate. Crazing occurs from the weak point. , Shrinkage stress up to 110kg / mm ~ 2, greatly exceeded the strength of steel, furnace shell rupture and expanded into a ring fracture.