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1、Q345E大規(guī)格H型鋼（Q345E large specification H steel） Volume 31, stage 2 In April 2009, Shandong metallurgical April2009 ShandongMetallurgyVol. 31, No. 2 Abstract: time limitation of Q345E large size h-beam way research found that less influence aging on the impact toughness and 40 ℃, using th

2、e energy method to determine the steel brittleness at low temperature Curve, the brittle transition temperature range for - 30 ~ 40 ℃. The analysis of metallographic structure, the macroscopic and microscopic appearance of the fracture and the microscopic appearance of the inclusions The analy

3、sis of electron probe spectroscopy shows that the main causes of low temperature impact toughness are serious banded structure and non-metallic inclusions in steel. Key words: h-shaped steel; Low temperature impact toughness; Aging; Banded structure; inclusions Middle image classification no.

4、: TG113; TG115 literature identification code: A post no. : 1004-4620 (2009) 02-0040-03 Deadline: 2008-12-23 The author: dong changxing, male, born in 1972, graduated from hebei chengde petroleum university in 1994 Technical college industrial analysis major. Now the quality supervision dep

5、artment of lai-steel quality assurance department Be engaged in quality inspection of steel products. 1 introduction The Q345E large specification H shape steel produced by laishan steel factory is at the beginning Fig.5 found to 40 ℃ impact AkV value is low and volatile, However, aft

6、er two weeks or so of aging, the AkV value increased significantly, mostly Several furnaces meet product standard requirements. In order to improve the steel Low temperature impact toughness and shorten aging time, for product storage, hair The conditions of the goods and the port are creat

7、ed, and the steel H section steel is tested in series And test analysis. By means of different aging methods, Hope to find the best way of aging; On the other hand, the macro of impact sample The distribution and morphology of the fracture, microfracture, tissue morphology and inclusions

8、 Analysis can determine the Q345E of large size h-beam and 40 ℃ impact For low reason, the direction of high temperature impact toughness is determined. 2 aging test The technical requirements of steel Q345E large H steel are shown in table 1 and table 2. often The temperature-aging test

9、 combines boiling water bath and oil bath with natural aging In the same way, the adverse conditions of temperature and environmental conditions are carried out. Aging test A total of 3 rounds were conducted, with the furnace number h083-3622q345e as the first The chemical composition and g

10、as content of the test samples were shown in table 3. Table 1 performance requirements The specification/mm is less than or equal to 16 or greater than or equal to 345 BBB 0, 16 ~ 35 sigma/MPa470 ~ 630 delta s / % Acuity 22 akv (to 40 ℃, the longitudinal)/J 27 q345e big h-beam and 40 ℃ or h

11、igher impact toughness is low cause analysis Dong changxing, cheng mei, time zhenming, dong bingcheng, liu hongyan (laiwu steel group co., LTD. Shandong laiwu 271104) ...... ...... ...... Experimental research project standard Internal control C is less than 0.180.13 ~

12、0.17 Si is less than 0.550.15 ~ 0.25 Mn1.0 ~ 1.61.2 ~ 1.4 P = 0.025 is less than or less than 0.025, or 0.025, or 0.025, 0.015 ~ 0.015 ~ 0.025 Table 2 chemical components control % Table 4 impact test data after oil bath Oil bath temperature / ℃ 120150200280340-40 ℃ AkV/J42, 84421 0,18,8

13、106,50,1020,128,4222,20,58 Test temperature Degree / ℃ The normal temperature 30-40 - Constant temperature of 7d1 # 10834322 # 13046133 # 10810144 # 14212105 # 138269 Room temperature of 15d1 # 10444462 # 11838183 # 9634404 # 11216385 # 1301820 Tabl

14、e 6. Time-temperature adverse impact data J Water bath time No bath 30 min45min60min90min The normal temperature 122,92,130116,144,114100,130,128128,120,12696,132,112-30 ℃ 46,24,4826,48,3028,20,1212,22,1840,38,32-40 ℃ 26, 14, 2834, 40, 32, 18, 12, 18, 14, 14, 12, 16 Table 5 w

15、ater bath after the impact test data JC0.178 Si0.214 Mn1.26 P0.009 S0.007 Cr0.024 Nb0.017 Ni0.01 Cu0.014 Al0.005 [O] * 10-654.1 [N] times 10-637.5 Table 3 samples of chemical composition and gas content % The impact test data after oil bath is shown in table 4 (30min oil bath time). The

16、test data of impact test after water bath is shown in table 5 (water bath temperature 100 ℃); Under normal temperature (10 ~ 30 ℃) aging impact test data shown in table 6. From a large number of experimental data, the temperature of normal temperature has a basic impact Is not affected, 15

17、d after aging, and 30 ℃ and 40 ℃ - impact sbent in Paris Improved, below 30 ℃ impact energy as a whole is not high and volatile, this master If it is caused by the release of residual stress; Oil bath or water bath quickly The effect of effect on the impact work has not been significantly b

18、eneficial It is not obvious that the impact work under the temperature of temperature is not obvious To take a water bath or oil bath with the test specimen, and the condition of the permanent temperature of the whole steel 40 Abstract: time limitation of Q345E large size h-beam way rese

19、arch found that less influence aging on the impact toughness and 40 ℃, using the energy method to determine the steel brittleness at low temperature Curve, the brittle transition temperature range for - 30 ~ 40 ℃. The analysis of metallographic structure, the macroscopic and microscopic appearanc

20、e of the fracture and the microscopic appearance of the inclusions The analysis of electron probe spectroscopy shows that the main causes of low temperature impact toughness are serious banded structure and non-metallic inclusions in steel. Key words: h-shaped steel; Low temperature impact tou

21、ghness; Aging; Banded structure; inclusions Middle image classification no. : TG113; TG115 literature identification code: A post no. : 1004-4620 (2009) 02-0040-03 Deadline: 2008-12-23 The author: dong changxing, male, born in 1972, graduated from hebei chengde petroleum university in 1994

22、 Technical college industrial analysis major. Now the quality supervision department of lai-steel quality assurance department Be engaged in quality inspection of steel products. 1 introduction The Q345E large specification H shape steel produced by laishan steel factory is at the beginni

23、ng Fig.5 found to 40 ℃ impact AkV value is low and volatile, However, after two weeks or so of aging, the AkV value increased significantly, mostly Several furnaces meet product standard requirements. In order to improve the steel Low temperature impact toughness and shorten aging time,

24、for product storage, hair The conditions of the goods and the port are created, and the steel H section steel is tested in series And test analysis. By means of different aging methods, Hope to find the best way of aging; On the other hand, the macro of impact sample The distribution and

25、 morphology of the fracture, microfracture, tissue morphology and inclusions Analysis can determine the Q345E of large size h-beam and 40 ℃ impact For low reason, the direction of high temperature impact toughness is determined. 2 aging test The technical requirements of steel Q345E larg

26、e H steel are shown in table 1 and table 2. often The temperature-aging test combines boiling water bath and oil bath with natural aging In the same way, the adverse conditions of temperature and environmental conditions are carried out. Aging test A total of 3 rounds were conducted, with t

27、he furnace number h083-3622q345e as the first The chemical composition and gas content of the test samples were shown in table 3. Table 1 performance requirements The specification/mm is less than or equal to 16 or greater than or equal to 345 BBB 0, 16 ~ 35 sigma/MPa470 ~ 630 delta s / %

28、 Acuity 22 akv (to 40 ℃, the longitudinal)/J 27 q345e big h-beam and 40 ℃ or higher impact toughness is low cause analysis Dong changxing, cheng mei, time zhenming, dong bingcheng, liu hongyan (laiwu steel group co., LTD. Shandong laiwu 271104) ...... ...... ...... Experimental re

29、search project standard Internal control C is less than 0.180.13 ~ 0.17 Si is less than 0.550.15 ~ 0.25 Mn1.0 ~ 1.61.2 ~ 1.4 P = 0.025 is less than or less than 0.025, or 0.025, or 0.025, 0.015 ~ 0.015 ~ 0.025 Table 2 chemical components control % Table 4 impact test data after oil

30、 bath Oil bath temperature / ℃ 120150200280340-40 ℃ AkV/J42, 84421 0,18,8106,50,1020,128,4222,20,58 Test temperature Degree / ℃ The normal temperature 30-40 - Constant temperature of 7d1 # 10834322 # 13046133 # 10810144 # 14212105 # 138269 Room temperature of 1

31、5d1 # 10444462 # 11838183 # 9634404 # 11216385 # 1301820 Table 6. Time-temperature adverse impact data J Water bath time No bath 30 min45min60min90min The normal temperature 122,92,130116,144,114100,130,128128,120,12696,132,112-30 ℃ 46,24,4826,48,3028,20,1212,22,1

32、840,38,32-40 ℃ 26, 14, 2834, 40, 32, 18, 12, 18, 14, 14, 12, 16 Table 5 water bath after the impact test data JC0.178 Si0.214 Mn1.26 P0.009 S0.007 Cr0.024 Nb0.017 Ni0.01 Cu0.014 Al0.005 [O] * 10-654.1 [N] times 10-637.5 Table 3 samples of chemical composition and gas content % The

33、impact test data after oil bath is shown in table 4 (30min oil bath time). The test data of impact test after water bath is shown in table 5 (water bath temperature 100 ℃); Under normal temperature (10 ~ 30 ℃) aging impact test data shown in table 6. From a large number of experimental data, t

34、he temperature of normal temperature has a basic impact Is not affected, 15 d after aging, and 30 ℃ and 40 ℃ - impact sbent in Paris Improved, below 30 ℃ impact energy as a whole is not high and volatile, this master If it is caused by the release of residual stress; Oil bath or water bath

35、quickly The effect of effect on the impact work has not been significantly beneficial It is not obvious that the impact work under the temperature of temperature is not obvious To take a water bath or oil bath with the test specimen, and the condition of the permanent temperature of the who

36、le steel 40 Different ways of quick aging of oil bath or water bath are not desirable. Determination of temperature range of low temperature brittle transition temperature 3.1 low temperature brittleness curve In order to adjust the composition of Q345E steel, it is mainly to adopt he

37、alth C, Nb, control measures, such as P, S, O content can produce - 40 ℃ Impact work meets national standards, but it is difficult to operate. Its prone to volatility. In order to assess the current production conditions Q345E The low temperature impact performance of steel is measured i

38、n the laboratory Temperature change curve of low temperature brittleness of shape steel (see figure 1). From figure 1 It can be seen that the impact absorption work has two platforms on the curve of temperature change Platform for high shock absorption function part, when the temperature dr

39、opped to about 30 ℃, With the decreasing of temperature, AkV fell sharply, when the temperature dropped to 40 ℃ In the lower case, the AkV changes small and enters the lower platform of low impact absorption work. Akv/J - 80-80 Test temperature / ℃ FIG. 1 steel Q345EH section steel ak

40、v-t curve 3.2 macro fracture analysis The typical macroscopic fracture morphology of a series of temperature shocks is shown in FIG. 2, from the room In the process of temperature drop to - 70 ℃, impact sample from ductile to brittle fracture The transition of the sexual fracture, the ar

41、ea of the fiber area and the shear labial area gradually dwindled to eliminate The area of the crystalline region gradually expands to the whole section. 40 ℃ to - The lower crispy tendency is severe. Room temperature 0 ℃ to 30 ℃ and 40 ℃ Figure 2. Typical temperature impact of the steel

42、 Q345EH section steel 3.3 microfracture analysis The microcosmic fracture of the impact of temperature impact on the whole section is in a fortitude. It shows that the steel has high toughness; - 10 ℃ when fracture has heart The crystallization appears in the river pattern; The temperatu

43、re dropped to - 30 ℃, the knot The crystalline region has expanded to the bottom; To 40 ℃ when only small near the gap The region appears to have a tough fossa, while the rest of the region has a fluvial streak The levy. The microfracture morphology shows that the temperature of the test is

44、 reduced The fracture mechanism is gradually changed from the fracture of the ductile to cleavage fracture. The microfracture morphology of typical test temperature impact samples is shown in FIG. 3 Shown below. 100 mu m100 approximately mu m100 approximately mu m100 approximately micron

45、s At room temperature the core department - 30 ℃ to 10 ℃ heart heart department to 40 ℃ Room temperature near gap area - 10 ℃ near gap area - 30 ℃ near gap area to 40 ℃ near gap area FIG. 3 typical temperature impact microfracture morphology of steel Q345EH section steel 100 mu m100 appr

46、oximately mu m100 approximately mu m100 approximately microns The energy method determines the temperature of the low temperature of Q345EH steel Temperature range between 30 ~ 40 ℃ - -. Good - 30 ℃ when the impact energy And stable, below 30 ℃ impact energy fell sharply, and 40 ℃ impact en

47、ergy Overall poor performance, brittle fracture tendency is serious. You can see, by composition The whole, and 30 ℃ impact energy can guarantee, and below - 30 ℃ steel has entered Ductile to brittle transition zone, want to ensure a stable qualified to 40 ℃ impact energy is difficult Is

48、 very large. Therefore, to further reduce the brittle transition temperature, from the root To improve the quality of steel, other technical means should be considered. Low temperature impact work and analysis of the cause of fluctuation 4.1 metallographic analysis Some samples of metall

49、ographic tissue observed that ferrite/pearlite Q345E big h-beam and 40 ℃ low impact toughness of cause analysis Dong Changxing etc. 2009 41 Different ways of quick aging of oil bath or water bath are not desirable. Determination of temperature range of low temperature brittle transition

50、temperature 3.1 low temperature brittleness curve In order to adjust the composition of Q345E steel, it is mainly to adopt health C, Nb, control measures, such as P, S, O content can produce - 40 ℃ Impact work meets national standards, but it is difficult to operate. Its prone to vola

51、tility. In order to assess the current production conditions Q345E The low temperature impact performance of steel is measured in the laboratory Temperature change curve of low temperature brittleness of shape steel (see figure 1). From figure 1 It can be seen that the impact absorption wor

52、k has two platforms on the curve of temperature change Platform for high shock absorption function part, when the temperature dropped to about 30 ℃, With the decreasing of temperature, AkV fell sharply, when the temperature dropped to 40 ℃ In the lower case, the AkV changes small and enters

53、 the lower platform of low impact absorption work. Akv/J - 80-80 Test temperature / ℃ FIG. 1 steel Q345EH section steel akv-t curve 3.2 macro fracture analysis The typical macroscopic fracture morphology of a series of temperature shocks is shown in FIG. 2, from the room In the pro

54、cess of temperature drop to - 70 ℃, impact sample from ductile to brittle fracture The transition of the sexual fracture, the area of the fiber area and the shear labial area gradually dwindled to eliminate The area of the crystalline region gradually expands to the whole section. 40 ℃ to -

55、 The lower crispy tendency is severe. Room temperature 0 ℃ to 30 ℃ and 40 ℃ Figure 2. Typical temperature impact of the steel Q345EH section steel 3.3 microfracture analysis The microcosmic fracture of the impact of temperature impact on the whole section is in a fortitude. It shows t

56、hat the steel has high toughness; - 10 ℃ when fracture has heart The crystallization appears in the river pattern; The temperature dropped to - 30 ℃, the knot The crystalline region has expanded to the bottom; To 40 ℃ when only small near the gap The region appears to have a tough fossa, wh

57、ile the rest of the region has a fluvial streak The levy. The microfracture morphology shows that the temperature of the test is reduced The fracture mechanism is gradually changed from the fracture of the ductile to cleavage fracture. The microfracture morphology of typical test temperatur

58、e impact samples is shown in FIG. 3 Shown below. 100 mu m100 approximately mu m100 approximately mu m100 approximately microns At room temperature the core department - 30 ℃ to 10 ℃ heart heart department to 40 ℃ Room temperature near gap area - 10 ℃ near gap area - 30 ℃ near gap area to

59、 40 ℃ near gap area FIG. 3 typical temperature impact microfracture morphology of steel Q345EH section steel 100 mu m100 approximately mu m100 approximately mu m100 approximately microns The energy method determines the temperature of the low temperature of Q345EH steel Temperature range

60、 between 30 ~ 40 ℃ - -. Good - 30 ℃ when the impact energy And stable, below 30 ℃ impact energy fell sharply, and 40 ℃ impact energy Overall poor performance, brittle fracture tendency is serious. You can see, by composition The whole, and 30 ℃ impact energy can guarantee, and below - 30 ℃

61、steel has entered Ductile to brittle transition zone, want to ensure a stable qualified to 40 ℃ impact energy is difficult Is very large. Therefore, to further reduce the brittle transition temperature, from the root To improve the quality of steel, other technical means should be considere

62、d. Low temperature impact work and analysis of the cause of fluctuation 4.1 metallographic analysis Some samples of metallographic tissue observed that ferrite/pearlite Q345E big h-beam and 40 ℃ low impact toughness of cause analysis Dong Changxing etc. 2009 41 Shandong metallurgic

63、al volume 31, April 2009 AnalysisonReasonsofLowImpactToughnessat - 40 ℃ ofQ345EBigSizeH - beamDONGChang - xing, CHENGMei, SHIZhen - Ming, DONGBing - cheng, LIUHong - yan (LaiwuIronandSteelGroupCorporation Laiwu271104, China) Abstract:Abstract:TheageingtestsofQ345EbigsizeH-beamwerestudiedand

64、theresultsshowedthattheinfluenceofageingonthelowtemperatureimpacttoughnessat-40℃wasless.Thechangecurveofabsorbed-in-fractureenergywiththetemperaturewasconfirmedbyenergymethodanditsbrittletransitiontemperaturerangeisfrom-30℃to-40℃.Withmicroscopeandelectronprobeetc,themetallographicstructure,macrograp

65、handmicro-morphologyoftheimpactfractureandthemicro-morphologyandmicroareacompositionofinclusionwereanalyzed.Theresultsindicatedthatthemainreasonsoflowimpacttoughnessweretheseriouszonestructureandthenon-metallicinclusion. Keywords: Keywords: H - beam; Lowtemperatureimpacttoughness; Ageing; Zonestr

66、ucture; The inclusion The ribbon is more serious. The performance of steel is also larger Because of the microstructure of adjacent bands of banded tissue, it is affected The performance is also different, with low performance under external forces Exposure, and the stress concentration between the strong and weak bands, is made The overall mechanical properties were reduced and the anisotropy was obvious The method of overheat treatment to eliminate the test sample of banded