（闽95J05）外墙面装修.pdf

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GB/T6728-2002 (国标)
结构用冷弯空心方矩型钢尺寸、外形、重量及允许偏差
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允许偏
壁厚理论重量截面面积惯性矩惯性半径截面模数扭转常数外圆弧半径/mm
差
厚度
/mm
B/mm t/mm M/(kg/m) A/cm^2 Ix=Iy/cm^4 rx=ry/cm Wx=Wy/cm^3 It/cm^4 Ct/cm^3 t/mm 碳素钢低合金钢
FGDA — FGXT ———————(σs≤320MPa) (σs≥320MPa)

— FGXR

20 ± t≤3 ~ ~

3<t≤6 ~ ~
2
6<
~ ~
t≤10
> ~ ~
25 ± t 10


2


30 ±


定尺精度允许偏差
2 2075 长度范围/mm
级别/mm

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3 普通级别 4000~12000 (+70,0)
精确级别 4000~6000 (+5,0)
>6000~
精确级别(+10,0)
12000
2
40 ±

3
4


2
50 ±

3
4
2