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槽钢分普通槽钢和轻型槽钢。热轧普通槽钢的规格为5-40#。经供需双方协议供应的热轧变通槽钢规格为6.5-30#。槽钢按形状又可分为4种：

冷弯等边槽钢、冷弯不等边槽钢、冷弯内卷边槽钢、冷弯外卷边槽钢。槽钢的材质为Q235A碳素钢。槽钢的表面质量及几何形状的允许偏差在标准中

有具体规定。一般要求表面不 得存在使用上有害的缺陷，不得有显著的扭转，规定槽钢波浪弯（镰刀弯）的允许值及各规格槽钢截面形状的有关参数

（h，b，d，t等）的数值、允差值。槽钢几何形状不正确的主要表现是：塌角、腿扩及腿并等。

The trough steel is divided into ordinary groove steel and light trough steel.The specification of hot rolled ordinary groove steel is 5-40 #.The specification of

hot rolled flexible tank steel supplied by supply and demand is 6.5-30 #.Slot steel can be divided into four kinds according to the shape: cold bent equal edge

groove steel, cold bending unequal edge groove steel, cold bend inner coil edge groove steel, cold bend outer coil edge groove steel.The trough steel is made of

Q235A carbon steel.The allowable deviation of the surface quality and geometry of the slot steel are specified in the standard.Generally, the surface is not

required with harmful defects in use, no significant torsion, specify the allowable value of trough steel wave bend (sickle bend) and the relevant parameters of

trough steel section shape (h, b, d, t, etc., etc.) of each specification.The main performance of incorrect groove steel geometry is: collapse Angle, leg expansion

and leg parallel, etc.