The Performance Of 785MPa Low-Carbon Copper-Bearing Ship Plate Steel
On-line direct quenching-tempering process (DQ-T) is gradually used to produce high-strength steel, which eliminates the reheating process of traditional heat treatment, and gives full play to the role of alloying elements to improve hardenability, which greatly improves the production efficiency and economy of steel plates. .
Copper-containing HSLA-80 (560 MPa), HSLA-100 (690MPa) series steels have good welding performance. During the tempering process, the precipitation strengthening of ε-Cu particles makes this series of steels high in strength, and low carbon mass fraction makes them excellent in low temperature toughness and welding performance.
Scholars from Jiangsu Iron and Steel Research Institute studied a ship plate steel with a yield strength greater than 785MPa, tested its dynamic continuous cooling phase transition curve (CCT), and studied the controlled rolling + direct quenching + tempering (DQ- T) Organizational properties after process treatment. The results show that the structure of the directly quenched (DQ) steel plate is lath martensite (LM), and the copper and niobium elements are dispersed and precipitated after tempering.
The strength of tempered steel plate at 500℃ is the highest, and the impact toughness (KV2) is the lowest. The steel plate is tempered at 710℃, its structure is secondary martensite (SLM) + ferrite, the yield strength (Re) is 810MPa, the tensile strength (Rm) is 1066MPa, and the elongation (A) is 17%. KV2 is 97J at -80℃, which achieves the best match of strength and toughness.
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