圆钢的规格有哪些及其所代表的意思？
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符号代表级别,后面的数字代表直径,比如一级钢屈服强度235MPa,,极限强度310MPa,二级钢屈服强度335MPa,,极限强度510MPa,三级钢屈服强度400MPa,极限强度600MPa,再举例,Φ14mm,这是表示一级钢,直径为14mm,

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圆钢的主要规格有：
　圆钢是指截面为圆形的实心长条钢材。其规格以直径的毫米数表示,如“,50”即表示直径为,50毫米的圆钢。标准：（,GB699-1988,、,GB700-1988,、,GB3077-1988,、,GB702-1986,、,QJ/ -1991,）,下表为圆钢详细的标准
材质,,规格,,材质,,规格,,
8#-10#,,∮16-290,,65Mn,,∮40-300,,
15#,,∮14-150,,45Mn2,,∮18-75,,
20,＃,,∮8-480,,60Si2Mn,,∮16-150,,
35,＃,,∮8-480,,20CrMnTi,,∮10-480,,
45,＃,,∮ -480,,20crmnTiB,,∮16-75,,
Q235B,,∮ -180,,GCr15,,∮16-400,,
40Cr,,∮8-480,,ML35,,∮8-150,,
20Cr,,∮10-480,,T8-T13,,∮8-480,,
42CrMo,,∮12-480,,Cr12,,∮16-300,,
35CrMo,,∮12-480,,Cr12MoV,,∮16-300,,
20CrMo,,∮12-300,,3Cr2W8V,,∮16-300,,
38CrMoAL,,∮20-300,,45Cr50Cr,,∮20-300,,
5CrMnMo,,∮20-450,,20CrMnMo,,∮20-300,,
16Mn,（,Q345B,）,,∮14-365,,40Mn2,,∮28-60,,
50Mn,,∮40-200,,35Cr,,∮55,,
15CrMo,,∮21∮24∮75,,15Mn,,∮32∮170,,
25,＃,,∮16-280,,40CrMnMo,,∮80-∮160,,
YF45MnV,,∮28-80,,20CrMnMo,,∮20-300,,
30,＃,,∮ -480,,27,SiMn,,∮20-350,,
30Crmo,,∮28,,Crwmn,,∮20-300