Q345R熱軋鋼帶的生產(chǎn)實(shí)踐

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PRODUCTIONPRACTICEOFQ345RHOT-ROLLED STEELSTRIP

He Xuchu1Wang Xusheng1Mei Jie2 （1.Technical Management Department of Guangxi Shenglong Metallurgical Co.，Ltd.Fangchenggang538000， China;2.Hainan Branch of China Classification Society.Haikou 57O2O3，China）

Abstract：Combining with theproduction of Q345R hot-rolled steel strip inafactory，TMCP isused toreduce the banded structure and improve the impact toughnes.The results showed that the Q345R contained a certain amount of granular bainite and the banded structure was 1.O grade，longitudinal impact SFA was more than 76.7 % ，KV2 was more than 156J at40 C ，transverse impact SFA was more than 40% ，KV2 was more than 72 Jat 40‰ ，ultrasonic testing quality grade was I on small steel plates，after annealingat 650 C for 60 minutes，the tensile strength of 16 mm steel plate is 542 MPa.Allthe test resultsmeet the standard requirements.Thefine and uniform surface structure has aimprovement efectontheimpacttoughnessof stelplates.Toensurethat thestrength meets therequirementsafter warm forming，it is recommended to control the tensile strength of Q345R within the range of 560＼～620 MPa.

Key words： Q345R；hot-rolled steel strip；granular bainite；impact toughness；banded structure

0引言

壓力容器鋼Q345R常見的缺陷主要有超聲波探傷不合、沖擊韌性不佳、強(qiáng)度偏低、帶狀、斷后伸長率不合格等，其中超聲波探傷不合及沖擊韌性不佳主要發(fā)生在較厚的中厚板中[1.2]，強(qiáng)度偏低發(fā)生在Q345R熱軋鋼帶制作封頭的時(shí)候，主要與熱成形或溫成形后強(qiáng)度降低有關(guān)[3.4；帶狀是斷后伸長率不合格的主要原因[5。（剩余5279字）