mm 5 1 Tab 1 Chemical composition of PSB830 finishing rolled rebars % C Si Mn P S V 0 38 ~ 1 50 ~ 0 80 ~ ~

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1 PSB mm PSB830 PSB830 TG A Productive Practition of PSB830 Finishing Rolled Rebars PAN Jianzhou Bar Steel Rolling Minguang Co Ltd of Fujian Sansteel Sanming China Abstract High strength precision-rolled reinforced rebar is less in domestic production enterprises the product quantity accounted for the entire reinforced market share is still very small proportion but the production process is not the same uneven quality and cost This paper introduces the key technology in the development and production of Sansteel bar plant with 32 mm PSB830 finishing rolled rebars aiming at the pass design including chemical composition phase adjustment metallographic analysis and mechanical properties of the products such as the production practice process and proposed solutions Through the process test solve the unstable performance shape control problems and low precision The unique application of Stepless phase regulator and slow cooling pit creatively eliminates the influence of aging performance on subsequent use so that the products to achieve the best quality the lowest cost the highest efficiency of the main target Keywords PSB830 finishing rolled rebar metallographic analysis mechanical property GB /T PSB785 PSB PSB930 PSB1080 4

2 mm 5 1 Tab 1 Chemical composition of PSB830 finishing rolled rebars % C Si Mn P S V 0 38 ~ 1 50 ~ 0 80 ~ ~ PSB830 GB /T PSB830 Tab 2 Mechanical properties of PSB830 finishing rolled rebars / / /% h MPa MPa /% /% mm PSB GBT S P 0 035% 32 mm GB / C Mn Si V T PSB Tab 3 3 PSB830 Size requirements for PSB830 finishing rolled rebars d s /mm d h / mm d y / mm a /mm b /mm c /mm / r ± ~ ± ± ± mm 160 mm 32 F 0 /F = δn 1 mm PSB830 F 0 F δ mm 2 n

3 Fig 1 1 Schematic diagram of finishing rolled rebars # K3-1 K1 K2 6 K1 K1 K2 2 L 2 K2 S S - L 0 2 mm 2 K1 K Fig 2 K1 K2 pass diagram of finishing rolled rebars ~ μm PSB830 μ k L = L ~ μ / 1 + k 2 Fink ~ ~ k = 2 sin2 α/2 D /h cosα α D h V 2 PSB D = N L /π + d - S 3 N L D S 8

4 4 4 + Tab 4 Dimensional measured value of finishing rolled rebars mm d s d h d y ± mm PSB830 7 d d GB /T Fig 3 3 PSB830 7 d Mechanical properties of PSB830 finishing rolled rebars after seven days aging mm + 1 /4 1 2 mm 7

5 Fig 4 4 PSB d Mechanical properties PSB830 finishing rolled rebars after twenty-one days aging Tab 5 5 Analysis results of metallographic structure / mm 1 /4 1 / mm mm 75% d K1 K MPa 2 3 PSB d 3 d

4 2014 9 32 mm PSB830 600 t 100% 98 70% 4 1 2 d 6 4 10 h 682 MPa 1 0% GB /T 20065 2006 4 2 6 5 32 mm PSB830 0 6 mm Fig 5 Metallographic structure

6 mm PSB t 100% 98 70% d h 682 MPa 1 0% GB /T mm PSB mm Fig 5 Metallographic structure of 32mm PSB830 finishing rolled rebars 5% 0 5 Fig 6 6 PSB830 2 d Mechanical properties of PSB830 finishing rolled rebars after two days slow cooling

7 / mm 32 6 Tab 6 Results of metallographic structure 1 /4 1 8 mm 81% mm 1 / PSB J K1 3 2 d PSB830 J 8 4 PSB830 PSB PSB PSB830 J PSB930 J J M PSB500 C PSB J C JL785MP C

T K mm mm Q345B 600 mm 200 mm 50 mm 600 mm 300 mm 50 mm 2 K ~ 0. 3 mm 13 ~ 15 mm Q345B 25

T K mm mm Q345B 600 mm 200 mm 50 mm 600 mm 300 mm 50 mm 2 K ~ 0. 3 mm 13 ~ 15 mm Q345B 25 23 4 2018 8 Vol. 23 No. 4 JOURNAL OF HARBIN UNIVERSITY OF SCIENCE AND TECHNOLOGY Aug. 2018 Q345B 1 " 1 2 2 2 1. 150040 2. 200125 Q345B 536. 47 MPa 281 HV Q345B DOI 10. 15938 /j. jhust. 2018. 04. 021 TG444