基于不同工藝的三種結(jié)構(gòu)用方鋼管材性研究*
喬文濤1，趙明善2
- 摘 要
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（1 石家莊鐵道大學(xué)土木工程學(xué)院，石家莊 050043；2 南洋理工大學(xué)土木與環(huán)境工程學(xué)院，新加坡 639798）
［摘要］對強度等級為S355的方鋼管的冷加工鋼、熱加工鋼和熱軋鋼的物理性能、化學(xué)性能和力學(xué)性能進行了對比研究。結(jié)果表明，3種鋼材均滿足加工標(biāo)準(zhǔn)BS EN 10219-2∶2006 和 BS EN 10210-1∶2006的要求。雖然生產(chǎn)工藝不同，但3種鋼材的化學(xué)成分相近，對于碳當(dāng)量CE值，熱加工鋼最大，其次是熱軋鋼，冷加工鋼最小。3種鋼材的力學(xué)性能顯著不同：冷加工鋼的屈服強度最高，但塑性最差；熱加工鋼的屈服強度最低，但塑性最好；熱軋鋼介于二者之間。此外，冷加工鋼的縱向殘余應(yīng)力最大，且在焊縫處波動明顯，轉(zhuǎn)角處不容忽視；而熱加工鋼的縱向殘余應(yīng)力最小，轉(zhuǎn)角處不明顯，大部分區(qū)域甚至受壓；熱軋鋼的縱向殘余應(yīng)力分布與冷加工鋼的相似，但應(yīng)力值小很多。［關(guān)鍵詞］冷加工鋼; 熱加工鋼; 熱軋鋼; 方鋼管; 材性中圖分類號：TU393.3 文獻標(biāo)識碼：A 文章編號：1002-848X(2015)14-0077-05
Material properties study on three types of structural square steel tubes with different manufacturing processesQiao Wentao1, Zhao Mingshan2(1 School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2 School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore)Abstract: A comparative study was carried out on the physical, chemical, and mechanical properties of the cold-formed, hot-formed and hot-finished square steel tubes with strength grade of S355. The research results indicate that the three types of steel are able to meet requirment of the production standards of BS EN 10219-2∶2006 and BS EN 10210-1∶2006. Although the manufacturing processes are different, the chemical compositions of the three types of steel are similar. The carbon equivalent (CE) value of the hot-formed steel is the biggest, followed by the hot-finished and then the hot-formed steel. The mechanical properties of the three sections are significantly different. The cold-formed steel shows the highest yield strength but the worst ductility and the hot-formed steel shows the lowest yield strength yet the best ductility, while the hot-finished steel behaves intermediately between the other two in both yield strength and ductility. Besides, the cold-formed steel has the largest residual stress, and the residual stress fluctuates distinctly in the weld seam and can not be ignored at the corners. However the hot-formed steel has the smallest residual stress which is not obvious at the corners, and most of parts are even in the state of compression. The hot-finished steel shows the similar residual stress distribution with the cold-formed steel but the values are much smaller.Keywords: cold-formed steel; hot-formed steel; hot-finished steel; square steel tube; material property
*國家自然科學(xué)基金青年基金項目（51208317），河北省高等學(xué)?？茖W(xué)技術(shù)研究優(yōu)秀青年基金項目（Z2013037）。作者簡介：喬文濤，博士，副教授，碩士生導(dǎo)師，Email：tottyer@126.com。
