工字钢 HW HM HN H型钢的区别

芇工字钢 HW HM HN H型钢的区别薂 工字钢翼缘是变截面靠腹板部厚,外部薄; H型钢的翼缘是等截面聿 HW HM HN H是H型钢的通称,H型钢是焊制; HW HM HN是热轧艿 HW 是