Abstract：20 mm thick yield strength 450 MPa weathering steel was successfully hot rolled based on continuous cooling transformation (CCT) behavior study, and its microstructure, mechanical properties, corrosion-resistance and weldability were analyzed. Both CCT and hot rolling test results suggest that a combination of finish rolling temperature of about 850 ℃, thickness reduction ratio≥0.6, cooling rate of between 15-30 ℃/s and cooling finish temperature ≤ 579 ℃ resulted in a plate consisting of polygonal ferrite (3-10 μm), degenerate pearlite and small amounts of M-A. The rolled plate exhibited a yield strength of 458 MPa, and tensile strength of 557 MPa, elongation ≥ 28% and impact absorbed energy ≥ 287 J at －60 ℃. The excellent low temperature toughness was derived from the small effective grain size of and high proportion of high-angle boundary. 72 h periodical dry-wet immersion corrosion test in NaHSO3 and NaCl solutions show that the corrosion resistance of the hot rolled plate was 49% and 40% higher than Q345B, respectively. Submerged arc welding with heat input of 30 kJ/cm was employed to the hot-rolled plate, and the heat affected zone shows an impact absorbed energy ≥ 156 J at －40 ℃.
郭慧英， 张 宇， 王银柏， 许红梅. 屈服强度450 MPa级新型耐候钢研制[J]. 钢铁, 2014, 49(11): 68-73.
GUO Hui-ying, ZHANG Yu, WANG yin-bai, XU Hong-mei. Development of a New Weathering Steel With Yield Strength of 450 MPa. Iron and Steel, 2014, 49(11): 68-73.
Y Y Chen, H J Tzeng, L I Wei, et al.Corrosion Resistance and Mechanical Properties of Low-Alloy Steels Under Atmospheric Conditions[J].Corrosion Science, 2005, 47:1001-
[7]
Y Y Chen, H J Tzeng, L I Wei, et al.Corrosion Resistance and Mechanical Properties of Low-Alloy Steels Under Atmospheric Conditions[J].Corrosion Science, 2005, 47:1001-
[8]
M Murayama, T Nishimra, K Tsuzaki.Nano-Scale Chemical Analysis of Rust on a 2% Si-Bearing Low Alloy Steel Exposed in a Coastal Environment [J].Corrosion Science, 2008, 50:2159-
[8]
M Murayama, T Nishimra, K Tsuzaki.Nano-Scale Chemical Analysis of Rust on a 2% Si-Bearing Low Alloy Steel Exposed in a Coastal Environment [J].Corrosion Science, 2008, 50:2159-
[9]
许红梅，张宇，王银柏等.一种低成本铝硅耐候钢的研制[J].钢铁, 2013, 48(8):70-
[9]
许红梅，张宇，王银柏等.一种低成本铝硅耐候钢的研制[J].钢铁, 2013, 48(8):70-
[10]
T Nishimura.Rust Formation and Corrosion Performance of Si- and Al- Bearing Ultrafine Grained Weathering Steel [J].Corrosion Science, 2008, 50:1306-
[10]
T Nishimura.Rust Formation and Corrosion Performance of Si- and Al- Bearing Ultrafine Grained Weathering Steel [J].Corrosion Science, 2008, 50:1306-
K Fumimaru, M Kazuyuki, O Tadashi, et al.Steel Plates for Bridge Use and Their Application Technologies[J].JFE Technical Report, 2004, (2):85-
[14]
K Fumimaru, M Kazuyuki, O Tadashi, et al.Steel Plates for Bridge Use and Their Application Technologies[J].JFE Technical Report, 2004, (2):85-
[15]
K Isamu, M Kazuyuki, K Fumimaru.Minimum Maintenance Steel Plates and Their Application Technologies for Bridge - Life Cycle Cost Reduction Technologies With Environment Safeguards for Preserving Social Infrastructure Assets[J].JFE Technical Report, 2005, (5):37-
[15]
K Isamu, M Kazuyuki, K Fumimaru.Minimum Maintenance Steel Plates and Their Application Technologies for Bridge - Life Cycle Cost Reduction Technologies With Environment Safeguards for Preserving Social Infrastructure Assets[J].JFE Technical Report, 2005, (5):37-
[16]
E J Pavlina, C J Van Tyne.Correlation of Yield Strength and Tensile Strength With Hardness for Steels[J].Journal of Materials Engineering and Performance, 2008, 17:888-
[16]
E J Pavlina, C J Van Tyne.Correlation of Yield Strength and Tensile Strength With Hardness for Steels[J].Journal of Materials Engineering and Performance, 2008, 17:888-
[17]
R W Armstrong.The Influence of Polycrystal Grain Size on Several Mechanical Properties of Materials [J]. Metallurgical Transactions, 1970, 1: 1169.[J].Metallurgical Transactions, 1970, 1:1169-
[17]
R W Armstrong.The Influence of Polycrystal Grain Size on Several Mechanical Properties of Materials [J]. Metallurgical Transactions, 1970, 1: 1169.[J].Metallurgical Transactions, 1970, 1:1169-
[18]
B Hwang, C G Lee, T H Lee.Correlation of Microstructure and Mechanical Properties of Thermomechanically Processed Low-Carbon Steels Containing Boron and Copper [J].Metallurgical and Materials Transactions A, 2010, 41A:85-
[18]
B Hwang, C G Lee, T H Lee.Correlation of Microstructure and Mechanical Properties of Thermomechanically Processed Low-Carbon Steels Containing Boron and Copper [J].Metallurgical and Materials Transactions A, 2010, 41A:85-
[19]
B Hwang, Y G Kim, S Lee, et al.Effective Grain Size and Charpy Impact Properties of High-Toughness X70 Pipeline Steels[J].Metallurgical and Materials Transactions A, 2005, 36A:2107-
[19]
B Hwang, Y G Kim, S Lee, et al.Effective Grain Size and Charpy Impact Properties of High-Toughness X70 Pipeline Steels[J].Metallurgical and Materials Transactions A, 2005, 36A:2107-
[20]
D S Liu, Q L Li, T Emi.Microstructure and Mechanical Properties in Hot-Rolled Extra High-Yield Strength Steel Plates for Offshore Structure and Shipbuilding[J].Metallurgical and Materials Transactions A, 2011, 42A:1349-
[20]
D S Liu, Q L Li, T Emi.Microstructure and Mechanical Properties in Hot-Rolled Extra High-Yield Strength Steel Plates for Offshore Structure and Shipbuilding[J].Metallurgical and Materials Transactions A, 2011, 42A:1349-
[21]
S T Wang, S W Yang, K W Gao, et al. Corrosion Behavior and Corrosion Products of a Low-Alloy Weathering Steel in Qingdao and Wanning[J].Materials, 2009, 16(1):58-
[21]
S T Wang, S W Yang, K W Gao, et al. Corrosion Behavior and Corrosion Products of a Low-Alloy Weathering Steel in Qingdao and Wanning[J].Materials, 2009, 16(1):58-
2014, Vol. 49 
