本文是学习GB-T 6723-2017 通用冷弯开口型钢. 而整理的学习笔记,分享出来希望更多人受益,如果存在侵权请及时联系我们
本标准规定了通用冷弯开口型钢的订货内容、分类、代号、截面尺寸及允许偏差、长度及允许偏差、
外形、技术要求、重量和标记示例。
本标准适用于冷轧或热轧钢带在连续辊式冷弯机组上生产的通用冷弯开口型钢(以下简称型钢)。
下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注日期的版本适用于本文
件。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。
GB/T 6725 冷弯型钢通用技术要求
按本标准订货的合同或订单应包括下列内容:
a) 标准编号;
b) 产品名称;
c) 牌号;
d) 交货重量;
e) 尺寸与外形;
f) 特殊要求。
型钢按其截面形状分为9种,其代号分别为:
a) 冷弯等边角钢
b) 冷弯不等边角钢JB;
c) 冷弯等边槽钢
d) 冷弯不等边槽钢
e) 冷弯内卷边槽钢
f) 冷弯外卷边槽钢
g) 冷弯 Z 形钢Z;
h) 冷弯卷边 Z 形钢
i) 卷边等边角钢
JD;
CD;
CB;
CN;
CW;
ZJ;
JJ。
型钢截面形状及标注符号分别见图1~图9。经供需双方协商并在合同中注明,可供应图1~图9
所列截面形状以外的型钢。
GB/T 6723—2017
5.2 型钢的尺寸、理论重量、截面面积及主要参数
型钢的尺寸、理论重量、截面面积及主要参数见表1~表9。经供需双方协商并在合同中注明,可供
应表1~表9所列尺寸以外的型钢,其参数由供需双方协商。
style="width:5.75997in;height:5.32004in" />
说 明 :
b— 边 宽 度 ;
t— 边 厚 度 ;
R— 内圆弧半径。
图 1 冷弯等边角钢(JD)
style="width:5.57338in;height:6.8266in" />
说明:
B—— 长边宽度;
b — 短边宽度;
t — 边厚度;
R— 内圆弧半径。
图2 冷弯不等边角钢(JB)
GB/T 6723—2017
说明:
B—— 边宽度;
H—— 高度;
t ——边厚度;
R— 内圆弧半径。
说明:
B— 长边宽度;
b — 短边宽度;
H— 高 度 ;
t — 边厚度;
R— 内圆弧半径。
style="width:5.45333in;height:6.85908in" />
图 3 冷弯等边槽钢(CD)
style="width:5.57998in;height:5.20674in" />
图4 冷弯不等边槽钢(CB)
GB/T 6723—2017
说 明 :
B—— 边宽度;
H— 高度;
C- 内卷边高度; t ——边厚度;
R— 内圆弧半径。
说明:
B— 边宽度;
H—— 高度;
C— 外卷边高度; t — 边厚度;
R— 外卷边弧半径。
style="width:5.10657in;height:6.33996in" />
图 5 冷弯内卷边槽钢(CN)
style="width:4.36002in;height:6.32016in" />
图 6 冷弯外卷边槽钢(CW)
4
GB/T 6723—2017
style="width:6.50668in;height:6.62684in" />
说明:
B—— 边宽度;
H— 高 度 ;
t — 边厚度;
R—— 弧半径。
图 7 冷 弯 Z 型 钢(Z)
style="width:6.90001in;height:6.7067in" />
说明:
B—— 边宽度;
H—— 高度;
C—— 卷边高度;
t ——边厚度;
R—— 弧半径。
图 8 冷弯卷边 Z 型 钢(ZJ)
GB/T 6723—2017
Y
说明:
b—— 边宽度;
t — 边厚度;
a— 卷边高度;
R—— 弧半径。
图 9 卷边等边角钢(JJ)
6
style="width:0.2068in;height:0.12004in" />
表 1 冷弯等边角钢基本尺寸与主要参数
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00
表 1 ( 续)
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表 2 冷弯不等边角钢基本尺寸与主要参数
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style="width:0.2134in;height:0.12004in" />
style="width:0.19998in;height:0.18675in" />
表 2 ( 续)
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表 3 冷弯等边槽钢基本尺寸与主要参数
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二
表 3 ( 续 )
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style="width:0.2068in;height:0.19336in" />
表 3 ( 续 )
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元
表 4 冷弯不等边槽钢基本尺寸与主要参数
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style="width:0.19998in;height:0.17338in" />
表 5 冷弯内卷边槽钢基本尺寸与主要参数
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元
表 5 ( 续 )
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style="width:0.2134in;height:0.18675in" />
表 6 冷弯外卷边槽钢基本尺寸与主要参数
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表 6 (续)
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2. 052.088 |
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5
表 7 冷弯 Z 形钢基本尺寸与主要参数
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style="width:0.21318in;height:0.18675in" />
表 7 ( 续 )
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表 8 冷弯卷边 Z 形钢基本尺寸与主要参数
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style="width:0.22682in;height:0.1932in" />
表 8 ( 续 )
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表 9 卷边等边角钢基本尺寸与主要参数
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GB/T 6723—2017
弯曲角部分的外圆弧半径应符合表10的规定。
表10 外圆弧半径 单位为毫米
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5.4.1 型钢非自由边长的允许偏差应符合表11的规定。
表 1 1 非自由边长允许偏差
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5.4.2 型钢自由边长的允许偏差应符合表12的规定。
表12 自由边长允许偏差
单位为毫米
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5.4.3
两个自由边长公称尺寸相等时,其实际尺寸差值不应大于公差的75%。两个自由边长公称尺寸
不相等时按较大边长允许偏差执行。
5.4.4
型钢平板部分壁厚的允许偏差应符合所用钢板和钢带的相应标准规定。弯曲角区域的壁厚减
薄量不超过型钢公称壁厚的10%。
弯曲角度的允许偏差应符合表13的规定。
GB/T 6723—2017
表13 弯曲角度允许偏差
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型钢尺寸应在距端部不小于100 mm 处测量。
6.1 型钢通常长度为4000mm~16000 mm
。经供需双方并在合同中注明,也可供应超过上述规定长
度的型钢。
6.2
型钢按定尺或倍尺长度交货时,应在合同中注明。当按定尺或倍尺交货时,其长度允许偏差应符
合表14的规定,合同中未注明定尺精度时按普通定尺交货。
表14 长度允许偏差
单位为毫米
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6.3 型钢允许交付不小于2000 mm
的短尺和非定尺,也可以接口管形式交货,但需方在使用时将接口
管切除。短尺和非定尺管重量应不超过总交货量的5%。
7.1 型钢弯曲度每米应不大于2 mm, 总弯曲度应不大于总长度的0.2%。
7.2 型钢平面部分的凹凸度应不超过该边长的0.6%,但至少为0.4 mm。
7.3
经供需双方协商并在合同中注明,可测量冷弯型钢的扭转度,测量时应在平台上进行,所测值应小
于V 值并按式(1)计算:
V=2+L×0.5/1000 ………………………… (1)
式中:
L— 长度,单位为毫米(mm);
GB/T 6723—2017
V— 扭转度,单位为毫米(mm)。
7.4 型钢端部应切正直,允许存在切割造成的较小变形和毛刺。
7.5 型钢外形应在距端部不小于100 mm 处测量。
型钢的牌号和化学成分(熔炼分析)、力学性能、工艺性能、表面质量等应符合GB/T
6725 的规定。
型钢按实际重量交货,也可按理论重量交货。
用牌号为 Q345 制成高度为160 mm、中腿边长为60 mm、小腿边长为20 mm、壁
厚 为 3 mm 的 冷
弯内卷边槽钢,其标记为:
style="width:7.11335in;height:0.68002in" />
更多内容 可以 GB-T 6723-2017 通用冷弯开口型钢. 进一步学习