16 304 301B,, (, 201900) : 304 301B,,,, 304, 304, : ; ; ; : TG142. 71 : B : 1008-0716 (2007) 04-0016 - 04 Study of On line Solution Trea tm en t of Austen itic Sta in less Steels 304 and 301B W ang Zh iyu, H an J ian, J iang L a izhu ( Sta in less Steel D iv., Baosteel Research In stitute, Shangha i 201900, Ch ina) Abstract: The effect of online solution treatment on structure and p roperties of austenitic stainless steels 304 and 301B has been investigated through the dual2pass hot comp ression and hot rolling tests. A s the finish2comp ression temperature and cooling rate were increased, and the coiling temperature was decreased, the m icrostructure of auste2 nitic stainless steel was imp roved, the carbide p recip itation was reduced or avoided, the intergranular corrosion resist2 ance and mechanical p roperties were imp roved. Since this technology was app lied to mass p roduction of austenitic stainless steel 304, it has been found that the steel s each p roperty was imp roved. Becides, the annealing p rocess before cold rolling, can be rep laced with the online solution. Keywords: online solution; austenitic stainless steel; intergranular corrosion; mechanical p roperty 0 0. 03% 0. 15% 0. 12% 301 1 000 M 23 C 6, Tama [ 1 ], 0. 006%, ( M 23 C 6, M 7 C 3 M 3 C) M 23 C 6 M 7 C 3 42% 65%,,,, 1981 2006 26034621 1 050 1 150,,,,,,, Matsumoto K [ 2 ], Honda M [ 3 ],,,,, 1 1. 1 304 301B ( 1),, 120 mm 100 mm 30 mm <8 12 mm <8 12mm Thermomaster2Z
304 301B 17 1 304 301B Table 1 Chem ical composition of stainless steels 304 and 301B % C Si Mn P S Cr N i N Mo Cu Fe 304 0. 055 0. 37 1. 08 0. 029 0. 004 18. 16 8. 15 0. 038 0. 12 0. 27 301B 0. 110 0. 67 0. 74 0. 027 0. 003 16. 60 6. 81 0. 038 0. 06 0. 23 10 / s 1 250, 5 m in,, 5 / s 1 200 60 s,, 10 s - 1, 0. 3; 1 000 1 050, 650, 1 1 Fig. 1 Sketch of establishment of hot comp ression parameters 304 301B, 30 mm 3 mm, 4, 1 250, 980,, 650 750 0. 5 h, 1. 2 1. 2. 1 304, 10% H 2 C 2 O 4 3V 90 s, 2,, 1 050 1 000, 1 050, ;, 30 / s, 304 [ 4 ], 10 / s 30 / s,, 2 304 Fig. 2 M icrostructure of hot comp ressed specimen 304,,, 304 800 850 [ 1 ],, 1. 2. 2 3 4 304 301B 650 750
18, 750,,,,, 2, 301B 3 301B ( SEM ) Fig. 3 M icrostructure of 301B at different coiling temperatures 4 304 ( SEM ) Fig. 4 M icrostructure ( SEM ) of 304 at different coiling temperatures 304, 304,,,, 2 Table 2 Mechanical p roperties of 304 and 301B at different coiling temperatures / R p0. 2 /MPa R m /MPa A 50 % 301B 650 472. 5 935. 0 30. 5 301B 750 437. 5 962. 5 26. 0 304 650 425. 0 750. 0 44. 0 304 750 365. 0 720. 0 43. 0 GB /T 4334. 4 2000, 301B 304, 5, 5 Fig. 5 Comparison of inter2granular corrosion resistance of 304 and 301B at different coiling temperatures 2 304,, 6 8
304 301B 19 6 304 Fig. 6 M icrostructure of 304 under different treatment states 7 304 Fig. 7 Mechanical p roperties of 304 under different treatment states 8 304 EPR Fig. 8 EPR curves of 304 under different treatment states, 8. 5,, 7. 0 304, 10 30 MPa, 50 120 MPa, EPR, J IS G0580 1986 0. 5 mol H 2 SO 4 0. 01 mol KSCN,, - 0. 4V,, 1. 666 mv / s, 0. 3 V ( SCE),, 8, J r, J a R a,, 3 R a : R a = 0. 857%, R a = 2. 5%, R a = 0. 434 6%,,,,, 60,,,,,,,, 10% 70%,, 0. 335, 0. 337, ( 32 )
32 5 304 Fig. 5 Effect of coiling temperature on distribution of different elements in 304 oxide scale [ 1 ],. [M ].,, 1991: 102. [ 2 ] Chen R Y, Yuen W Y D, A study of the scale structure of hot - rolled steel strip by simulated coiling and cooling[ J ]. Oxi2 dation of Metals, 2000, 53 (5 /6) : 539-559. [ 3 ],. [ J ]., 1999, (3) : 24-26. [ 4 ] L i L ian - Fu, Peter Caenen, Mathieu Daerden, et al. Mecha2 nism of single and multip le step p ickling of 304 stainless steel in acid electrolytes[ J ]. Corrosion Science, 2005, 47: 1308. [ 5 ]. [ J ]. :, 2001: 45. ( : 2007-05 - 28) ( : 2007-06 - 07) ( 19 ), 304,,, 3 (1) 304 301B, (2) 10 30 MPa (3) :, [ 1 ]. [M ]. :, 2004: 102-110. [ 2 ] Matsumoto K, Tsuyama S, Kobayashi Y, et al. Properties and Carbide Morphology of Austenitic Stainless Steel Processed by Controlled Rolling and Accelerated Cooling[ J ]. ISIJ, 1989, 75 (2) : 329-336. [ 3 ] Honda M, Yamamoto S, Tsuyama S, et al. Development of Stainless Steels and Clad SteelsManufactured byolac Process [ J ]. N ippon Kokan Tech, 1987, 116 (1) : 17-24. [ 4 ] Ouchi C. Development of Steel Plates by Intensive U se of TM2 CP and D irect Quenching Processes[ J ]. ISIJ, 2001, 41 ( 6) : 542-553. ( : 2007-05 - 29) ( : 2007-06 - 05)