2historically often written 李纲 (Lǐ Gāng, 1083-1140), a Northern/Southern Song dynasty official who led the 1126 defense of Kaifeng against the Jurchens
The Song dynasty anti-Jurchen official Li Gang is also popularly written with the character 钢 'steel'.
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history
The historical Li Gang (properly 李纲, 1083-1140) organized the successful defense of Kaifeng during the first Jurchen siege of 1126 - only to be dismissed by the vacillating Emperor Qinzong. When the Jurchens returned and took the capital in 1127 (the Jingkang humiliation 靖康之耻), his removal was widely blamed. He briefly served Southern Song's Emperor Gaozong as Chancellor.
mistakes
The historical figure's correct character is 纲 (gāng, 'main rope; guiding principle'), not 钢 (gāng, 'steel') - but internet searches and informal writing often mix the two since both are read Lǐ Gāng.