PSB830 365000 32 mm PSB830 PSB830 TG 335 64 A Productive Practition of PSB830 Finishing Rolled Rebars PAN Jianzhou Bar Steel Rolling Minguang Co Ltd of Fujian Sansteel Sanming 365000 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 0 2006 GB /T 20065 2006 PSB785 PSB830 20 70 PSB930 PSB1080 4
18 25 32 40 50 mm 5 1 Tab 1 Chemical composition of PSB830 finishing rolled rebars % C Si Mn P S V 0 38 ~ 1 50 ~ 0 80 ~ 0 120 ~ 0 035 0 035 2 0 45 1 70 1 00 0 140 1 1 2 PSB830 GB /T 20065 2006 3 2 2 PSB830 Tab 2 Mechanical properties of PSB830 finishing rolled rebars / / /% 1 000 h MPa MPa /% /% 830 1 030 6 3 5 0 8 3 32 mm 840 1 040 6 3 5 0 8 3 PSB830 1 1 3 1 1 1 1 1 1 GBT 20065 2006 S P 0 035% 32 mm GB / C Mn Si V T 20065 2006 1 1 PSB830 3 1 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 32 32 0 ± 0 5 30 8 ~ 32 4 2 0 ± 0 4 7 0 ± 0 5 16 0 ± 0 3 80 4 1 2 1 28 1 14 1 2 1 160 mm 160 mm 32 F 0 /F = δn 1 mm PSB830 F 0 F δ 804 2 mm 2 n
Fig 1 1 Schematic diagram of finishing rolled rebars 1 2 2 1 2 4 1 # K3-1 K1 K2 6 K1 K1 K2 2 L 2 K2 S S - L 0 2 mm 2 K1 K2 1 2 5 Fig 2 K1 K2 pass diagram of finishing rolled rebars 1 1 2 3 1 020 1 7 5 ~ 9 1 050 1 080 65 μm 5 4 1 020 7 PSB830 μ k L = L 0 1 040 ~ 1 100 5 μ / 1 + k 2 Fink 1 060 ~ 1 160 1 020 ~ 1 030 k = 2 sin2 α/2 D /h cosα - 1 2 30 α D h V 2 PSB830 2 3 D = N L /π + d - S 3 N L D S 8
4 4 + Tab 4 Dimensional measured value of finishing rolled rebars mm d s d h d y 32 32 0 31 6 1 9 7 0 16 1 700 ± 30 650 2 2 3 32 mm PSB830 7 d 4 2 4 21 d 4 2 1 GB /T 20065 2006 Fig 3 3 PSB830 7 d Mechanical properties of PSB830 finishing rolled rebars after seven days aging 2 3 + 5 5 4 0 mm + 1 /4 1 2 mm 7
Fig 4 4 PSB830 21 d Mechanical properties PSB830 finishing rolled rebars after twenty-one days aging Tab 5 5 Analysis results of metallographic structure / mm 1 /4 1 /4 32 1 2 mm + 4 0 mm 75% + + 7 3 20 d 3 1 1 3 2 1 K1 K1 2 2 0 MPa 2 3 PSB830 3 2 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 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
/ mm 32 6 Tab 6 Results of metallographic structure 1 /4 1 8 mm 81% + + + 2 5 mm 1 /4 8 5 1 PSB830 1991 39 2 5 J K1 3 2 d PSB830 J 8 4 PSB830 PSB930 6 51-53 PSB1030 9 1 PSB830 J - 685 2015 8 51 2 PSB930 J 2012 34 5 25-26 3 J 2014 8 39-41 4 M 2013 30 4 69-72 6 PSB500 C 2012 2012 196-199 7 PSB785 2012 38 3 63-65 J 2010 23 C 2012 146-151 10 JL785MP C 2001 682