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Chinese Journal of Materials Research  2015, Vol. 29 Issue (12): 948-954    DOI: 10.11901/1005.3093.2015.12.948
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Effect of Thermo-mechanical Control Processing on Microstructure and Properties of High Toughness X90 Pipeline Steel
Tao NIU1,*(),Yongwen JIANG1,Fei LI1,Guosen ZHU1,Xinlang WU2,Junkuan WU2
1. Shougang Research Institute of Technology, Beijing 100043, China
2. Shougang Qian'an Iron & Steel Co.Ltd, Qian'an 064404, China
Cite this article: 

Tao NIU,Yongwen JIANG,Fei LI,Guosen ZHU,Xinlang WU,Junkuan WU. Effect of Thermo-mechanical Control Processing on Microstructure and Properties of High Toughness X90 Pipeline Steel. Chinese Journal of Materials Research, 2015, 29(12): 948-954.

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Abstract  

Effect of the main TMCP parameters on mechanical properties and microstructure characteristics of X90 pipeline steel was investigated by a labroratory simulated TMPC with desired processing parameters, including reheating temperature, intermediate slab thickness and coiling temperature. Results show that the strength increases with the increment of reheating temperature at first, but dramatically reduces when the grain size gets coarse at reheating temperature of 1250℃. Thicker intermediate slab contributes to higher strength and toughness because of a homogenized microstructure with refined grains was brought out. Coiling temperature plays the most important role in controlling the steel property. A microstructure composed of proper combination of granular banite and lath banite of the steel with optimal matching of strength and toughness can be achieved when coiling at 320℃. An industrial production of X90 coil were carried out employing the parameters obtained through the investigation, high strength combined with great low temperature toughness has been achieved, which proves that TMCP technology in this study has a good practice effect.
Key words:  metallic materials      pipeline steel      X90      TMCP      microstructure      property     
Received:  20 January 2015     
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Articles by authors
Tao NIU
Yongwen JIANG
Fei LI
Guosen ZHU
Xinlang WU
Junkuan WU

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.12.948     OR     https://www.cjmr.org/EN/Y2015/V29/I12/948

No. Reheating temperature
/℃		 Reheating time
/min		 Intermediate slab thickness
/mm		 Finishing rolling temperature
/℃		 Coiling temperature
/℃
1# 1210 180 36 810 460
2# 1210 180 36 810 320
3# 1210 180 36 810 100
4# 1180 180 36 810 320
5# 1250 180 36 810 320
6# 1210 180 32 810 320
Table 1  Experimental technology parameters
Fig.1  Effect of reheating temperature on mechanical properties (a) strength, (b) Y/T ratio, (c) Akv2, (d) elongation
Fig.2  Effect of reheating temperature on microstructure (a) 1250℃, (b) 1210℃, (c) 1180℃
Fig.3  Effct of intermediate billet thickness on microstructure (a) 36 mm, (b) 32 mm
Fig.4  Effect of coiling temperature on mechanical properties (a) strength, (b) Y/T ratio, (c) Akv2, (d) elongation
No. Intermediate slab thickness
/mm		 Rp0.2
/MPa		 Rm
/MPa		 Auel
/%		 A50.8
/%		 Rp0.2/Rm Akv2/J
-20℃ -40℃ -60℃
5# 36 845 1003 3.3 24.8 0.84 265 261 171
6# 32 822 1005 3.3 24.2 0.82 193 204 166
Table 2  Comparasion of Properties obtained with different intermidiate slab thickness
Fig.5  Effect of coiling temperature on microstructure (a) 460℃, (b) 320℃, (c) 100℃
Fig.6  Granular banite microstructure and M/A island (a) Granular banite, (b) M/A island
Fig.7  Lath banite microstructure, dislocations and residual austenite (a) Lath banite, (b) residual austenite, (c) diffraction spot
Coil No. Rp0.2
MPa		 Rm
MPa		 A50.8
%		 Y/T Akv2(-20℃)
J		 HV10 DWTT(-15℃)
%
1310169121030 635 740 21 0.86 374 262 100
1310169121030 630 775 15 0.82 373 261 100
1310169221010 640 790 17 0.81 387 262 100
Standard 625~775 695~915 ≥14.2 ≤0.95 ≥295 ≤285 ≥85
Table 3  Mechanical properties of indurstrial produced X90 pipeline steel
Fig.8  Impacting toughness at serial test temperatures
Fig.9  DWTT toughness at serial test temperatures
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