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冷轧带肋钢筋
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GBT 13788-2017
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标准编号: GB/T 13788-2017 (GB/T13788-2017)
中文名称: 冷轧带肋钢筋
英文名称: Cold rolled ribbed steel bars
行业: 国家标准 (推荐)
中标分类: H44
国际标准分类: 77.140.60
字数估计: 11,131
发布日期: 2017-07-12
实施日期: 2018-04-01
旧标准 (被替代): GB/T 13788-2008
引用标准: GB/T 2101; GB/T 2103; GB/T 17505; GB/T 21839; GB/T 28899; GB/T 28900; YB/T 081
起草单位: 中冶建筑研究总院有限公司、安阳合力创科冶金新技术股份有限公司、安徽马钢比亚西钢筋焊网有限公司、天津银龙预应力材料股份有限公司、冶金工业信息标准研究院
归口单位: 全国标准化技术委员会(SAC/TC 183)
提出机构: 中国钢铁工业协会
发布机构: 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会
范围: 本标准规定了冷轧带肋钢筋的术语和定义、分类、牌号、尺寸、外形、重量及允许偏差、技术要求、试验方法、检验规则、包装、标志和质量证明书。本标准适用于预应力混凝土和普通钢筋混凝土用冷轧带肋钢筋，也适用于制造焊接网用冷轧带肋钢筋(以下简称钢筋)。
GB/T 13788-2017: 冷轧带肋钢筋
GB/T 13788-2017 英文名称: Cold rolled ribbed steel bars
1 范围
本标准规定了冷轧带肋钢筋的术语和定义、分类、牌号、尺寸、外形、重量及允许偏差、技术要求、试验方法、检验规则、包装、标志和质量证明书。
本标准适用于预应力混凝土和普通钢筋混凝土用冷轧带肋钢筋,也适用于制造焊接网用冷轧带肋
钢筋(以下简称钢筋)。
2 规范性引用文件
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 2101 型钢验收、包装、标志及质量证明书的一般规定
GB/T 2103 钢丝验收、包装、标志及质量证明书的一般规定
GB/T 17505 钢及钢产品 交货一般技术要求
GB/T 21839 预应力混凝土用钢材试验方法
GB/T 28899 冷轧带肋钢筋用热轧盘条
GB/T 28900 钢筋混凝土用钢材试验方法
YB/T 081 冶金技术标准的数值修约与检测数值的判定
3 术语和定义
下列术语和定义适用于本文件。
3.1
冷轧带肋钢筋
热轧圆盘条经冷轧后,在其表面带有沿长度方向均匀分布的横肋的钢筋。
3.2
公称直径
相当于横截面积相等的光圆钢筋的公称直径。
3.3
相对投影肋面积
横肋在与钢筋轴线垂直平面上的投影面积与公称周长和横肋间距的乘积之比。
3.4
横肋间隙
钢筋周圈上横肋不连续部分在垂直于钢筋轴线平面上投影的弦长。
4 分类、牌号
4.1 分类及代号
冷轧带肋钢筋按延性高低分为两类:
冷轧带肋钢筋 CRB
高延性冷轧带肋钢筋 CRB+抗拉强度特征值+H
C、R、B、H分别为冷轧(Coldroled)、带肋(Ribbed)、钢筋(Bar)、高延性(Highelongation)四个词
的英文首位字母。
4.2 牌号
钢筋分为 CRB550、CRB650、CRB800、CRB600H、CRB680H、CRB800H 六个牌号。CRB550、CRB600H为普通钢筋混凝土用钢筋,CRB650、CRB800、CRB800H为预应力混凝土用钢筋,CRB680H既可作为普通钢筋混凝土用钢筋,也可作为预应力混凝土用钢筋使用。
5 尺寸、外形、重量及允许偏差
5.1 公称直径范围
CRB550、CRB600H、CRB680H 钢筋的公称直径范围为4 mm~12 mm。CRB650、CRB800、
CRB800H公称直径为4mm、5mm、6mm。
5.2 外形
5.2.1 钢筋表面横肋应符合5.2.1.1~5.2.1.6的规定。
5.2.1.1 二面肋和三面肋钢筋横肋呈月牙形,四面肋横肋的纵截面应为月牙状并且不应与横肋相交。
5.2.1.2 横肋沿钢筋横截面周圈上均匀分布,其中二面肋钢筋一面肋的倾角应与另一面反向,三面肋钢筋有一面肋的倾角应与另两面反向。四面肋钢筋两相邻面横肋的倾角应与另两面横肋方向相反。
5.2.1.3 二面肋和三面肋钢筋横肋中心线和钢筋纵轴线夹角β为40°~60°。四面肋钢筋横肋轴线与钢筋轴线的夹角应为40°~70°,对于两排肋之间的角度可以为35°~75°。
5.2.1.4 二面肋和三面肋钢筋横肋两侧面和钢筋表面斜角α不得小于45°,四面肋钢筋横肋两侧面和钢筋表面斜角α不得小于40°,横肋与钢筋表面呈弧形相交。
5.2.1.5 二面肋和三面肋钢筋横肋间隙的总和应不大于公称周长的20%(∑fi≤0.2πd),四面肋钢筋
横肋间隙的总和应不大于公称周长的25%(∑fi≤0.25πd)。
5.2.1.6 相对肋面积fr按式(1)确定:
5.2.2 二面肋钢筋的外形应符合图1和5.2.1的规定。
5.2.3 三面肋钢筋的外形应符合图2和5.2.1的规定。
5.2.4 四面肋钢筋的外形应符合图3和5.2.1的规定。
5.3 尺寸、重量及允许偏差
注1:横肋l/4处高、横肋顶宽供孔型设计用。
注2:二面肋钢筋允许有高度不大于0.5h的纵肋。
注:横肋l/4处高、横肋顶宽供孔型设计用。
5.4 长度
钢筋通常按盘卷交货,经供需双方协商也可按定尺长度交货。钢筋按定尺交货时,其长度及允许偏
差按供需双方协商确定。
5.5 弯曲度
直条钢筋的每米弯曲度不大于4mm,总弯曲度不大于钢筋全长的0.4%。
5.6 重量
5.6.1 盘卷钢筋的重量不小于100kg。每盘应由一根钢筋组成,CRB650、CRB680H、CRB800、
CRB800H作为预应力混凝土用钢筋使用时,不得有焊接接头。
5.6.2 直条钢筋按同一牌号、同一规格、同一长度成捆交货,捆重由供需双方协商确定。
6 技术要求
6.1 原料
制造钢筋的原料宜符合GB/T 28899的规定,也可采用按其他标准生产的盘条。
6.2 交货状态
钢筋按冷加工状态交货。允许冷轧后进行低温回火处理。
6.3 力学性能和工艺性能
6.3.1 钢筋的力学性能和工艺性能应符合表3的规定。当进行弯曲试验时,受弯曲部位表面不得产生裂纹。反复弯曲试验的弯曲半径应符合表4的规定。
6.3.2 经供需双方协议,钢筋可用最大力总延伸率代替断后伸长率。
6.3.3 供方在保证1000h松弛率合格基础上,允许使用推算法确定1000h松弛。
6.4 表面质量
6.4.1 钢筋表面不得有裂纹、折叠、结疤、油污及其他影响使用的缺陷。
6.4.2 钢筋表面可有浮锈,但不得有锈皮及目视可见的麻坑等腐蚀现象。
7.1 检验项目
钢筋出厂检验的检验项目、取样数量、取样方法、试验方法应符合表5的规定。
7 重量偏差 7.5
7.2 力学性能
计算钢筋强度采用表1和表2所列公称横截面积。
7.3 应力松弛试验
7.3.1 试验期间试样的环境温度应保持在20℃±2℃。
7.3.2 试样可进行机械矫直,但不得进行任何热处理和其他冷加工。
7.3.3 加在试样上的初始试验力为试样公称抗拉强度的70%乘以试样公称横截面积。
开始记录松弛值。
7.3.5 试样长度不小于公称直径的60倍。
7.3.6 允许用至少120h的测试数据推算1000h的松弛率值。
7.4 尺寸测量
7.4.1 横肋高度的测量采用测量同一截面每列横肋高度取其平均值;横肋间距采用测量平均间距的方法,即测取同一列横肋第1个与第11个横肋的中心距离除以10,即为横肋间距的平均值。
7.4.2 尺寸测量精度精确到0.02mm。
7.5 重量偏差的测量
测量钢筋重量偏差时,试样长度应不小于500mm。
7.6 数值修约
8 检验规则
8.1 检查和验收
钢筋的检查和验收由供方质量监督部门进行。需方有权进行检验。
8.2 组批规则
钢筋应按批进行检查和验收,每批应由同一牌号、同一外形、同一规格、同一生产工艺和同一交货状态的钢筋组成,每批不大于60t。
8.3 取样数量
钢筋检验的取样数量应符合表5的规定。
8.4 复验与判定规则
钢筋的复验与判定规则应符合GB/T 17505的规定。
9.1 每盘(捆)钢筋应均匀捆扎不少于3道,端头应弯入盘内。
9.2 钢筋应轧上明显的钢筋牌号标志,标志间距为横肋间距的两倍,标志间距内的一条横肋取消,如
图4所示;高延性冷轧带肋钢筋还应在第三个标志间距内增加一条短横肋,如图5所示;钢筋还可轧上厂名或厂标。
9.3 每盘(捆)钢筋应挂有不少于两个标牌,注明生产厂、生产日期、钢筋牌号和规格。
9.4 钢筋的包装、标志和质量证明书除上述规定外,应符合GB/T 2101或GB/T 2103中的有关规定。
GB/T 13788-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Replacing GB/T 13788-2008
Cold rolled ribbed steel bars
ISSUED ON. JULY 12, 2017
IMPLEMENTED ON. APRIL 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
3. No action is required - Full-copy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope .. 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Classification and designations ... 6
5 Size, shape, weight, and allowable deviation .. 6
6 Technical requirements ... 13
7 Test methods ... 15
8 Inspection rules .. 16
9 Packaging, marking, and quality certificate ... 17
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 13788-2008 “Cold rolled ribbed steel wires and
bars”. As compared with GB/T 13788-2008, the main technical changes of this
Standard are as follows.
- RIVISE relevant provisions on classification and codes;
- ADD the designations of high-elongation cold rolled ribbed steel bars.
CRB600H, CRB680H, and CRB800H;
- ADD the shape, size and mark diagram of four-sided ribbed steel bars;
- RIVISE relevant provisions on the designation and chemical composition;
- ADD the mechanical property requirement for high-elongation cold rolled
ribbed steel bars CRB600H, CRB680H, and CRB800H;
- RIVISE relevant provisions on percentage elongation after fracture,
percentage total elongation at maximum force (Agt) and tensile-to-yielding
ratio;
- RIVISE relevant provisions on test methods;
- DELETE Appendix A “Determination methods of steel bars at percentage
total elongation at maximum force”;
- DELETE Appendix B “Reference designations and chemical composition
of wire rods for cold rolled ribbed steel bars”.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of China National Standardization
Technology Committee (SAC/TC 183).
Drafting organizations of this Standard. Central Research Institute of Building
and Construction Co., Ltd., Anyang Heli Techtronic Co., Ltd., Anhui BRC & Ma
Steel Weldmesh Co., Ltd., Silvery Dragon Prestressed Materials Co., Ltd.
Tianjin, and China Metallurgical Information and Standardization Institute.
Main drafters of this Standard. Yue Qingrui, Feng Chao, Tao Ran, Zhai Wen,
Guo Sihong, Ai Tieling, Li Yajie, Zhang Pingyuan, Xie Zhian, Liu Baoshi, Wang
Xianhua, Du Ruiqing, Zhang Ying, Wang Yujie.
Cold rolled ribbed steel bars
1 Scope
This Standard specifies the terms and definitions, classification, designation,
size, shape, weight, allowable deviation, technical requirements, test methods,
inspection rules, packaging, marking, and quality certificate of cold rolled ribbed
steel bars.
This Standard is applicable to cold rolled ribbed steel bars for prestressed
concrete and ordinary reinforced concrete, and cold rolled ribbed steel bars
(known as steel bars for short hereinafter) for manufacturing welded mesh.
2 Normative references
The following documents are essential to the application of this document. For
the dated references, only the versions with the dates indicated are applicable
to this document. For the undated references, the latest version (including all
the amendments) are applicable to this document.
certification for section steel
GB/T 2103 General requirements for acceptance, packing, marking and
quality certification of steel wire
GB/T 17505 Steel and steel products General technical delivery
requirements
GB/T 21839 Steel for prestressed concrete - Test methods
GB/T 28899 Wire rods for cold rolled ribbed steel bars
GB/T 28900 Test methods of steel for reinforcement of concrete
YB/T 081 Rule for Rounding Off of Numerical Values and Judgement of
3 Terms and definitions
The following terms and definitions are applicable to this document.
The range of nominal diameter of CRB550, CRB600H, and CRB680H steel
bars is 4 mm~12 mm. The nominal diameter of CRB650, CRB800, and
CRB800H is 4 mm, 5 mm, and 6 mm.
5.2 Shape
5.2.1 The transverse ribs on the surface of steel bars shall conform to the
provisions of 5.2.1.1~5.2.1.6.
5.2.1.1 The transverse ribs of two-sided and three-sided ribbed steel bars shall
steel bars shall be crescent and shall not intersect with the transverse ribs.
5.2.1.2 Transverse ribs shall be uniformly distributed along the circumferential
ring of the cross section of steel bars. The inclination of one rib of two-sided
ribbed steel bars shall be reversed with the other rib. The inclination of one rib
of three-sided ribbed steel bars shall be reversed with the other two ribs. The
inclination of the two adjacent transverse ribs of four-sided ribbed steel ribs
shall be opposite to that of the other two transverse ribs.
5.2.1.3 The included angle β between the center line of the transverse rib and
the longitudinal axis of the steel bar of two-sided and three-sided ribbed steel
the axis of the steel bar of four-sided ribbed steel bars shall be 40°~70°; the
angle between the two rows of ribs can be 35°~75°.
5.2.1.4 The bevel angle α between the two sides of the transverse rib and the
surface of the steel bar of two-sided and three-sided ribbed steel bars shall not
be less than 45°. The bevel angle α between the two sides of the transverse rib
and the surface of the steel bar of four-sided ribbed steel bars shall not be less
than 40°. The transverse rib shall intersect the surface of the steel bar in an arc.
5.2.1.5 The sum of rib spacing of two-sided and three-sided ribbed steel bars
shall not be greater than 20% of the nominal circumference (∑fi ≤ 0.2πd). The
of the nominal circumference (∑fi ≤ 0.25πd).
5.2.1.6 The specific rib area fr shall be determined by the equation (1).
Where.
K=2, 3, or 4 (two-sided ribs, three-sided ribs, or four-sided ribs);
demand parties, it can also be delivered according to a specified length. When
the steel bar is delivered according to a specified length, the length and
allowable deviation shall be determined through consultation between the
supply-demand parties.
5.5 Bending
total bending shall not be greater than 0.4% of the total length of the steel bar.
5.6 Weight
5.6.1 The weight of a coiled steel bar shall not be less than 100 kg. Each coil
shall be made up of a steel bar. When CRB650, CRB680H, CRB800, CRB800H
are used as steel bars for prestressed concrete, there shall be no welded joints.
5.6.2 The straight steel bar, according to the same designation, the same
specification, and the same length, shall be delivered in bundles. The weight of
the bundle shall be determined by consultation between the supply-demand
parties.
6.1 Raw material
The raw material for manufacturing steel bars shall be in accordance with the
provisions of GB/T 28899. The wire rods produced according to other standards
can also be used.
6.2 Delivery state
The steel bar is delivered in cold working state. It is allowed that low
temperature tempering is implemented after cold rolling.
6.3 Mechanical and processing properties
6.3.1 The mechanical and processing properties of steel bars shall conform to
crack on the surface of the bent part. The bending radius of repeated bending
test shall conform to the provisions of Table 4.
7.3.2 The sample may be mechanically straightened. But there shall not be any
heat treatment and other cold working.
7.3.3 The initial test force applied to the sample is that, 70% of the nominal
tensile strength of the sample multiplies by the nominal cross-sectional area of
the sample.
7.3.4 The loading speed is 200 MPa/min±50 MPa/min. The initial load shall be
completed in 3 min~5 min. After holding the load for 2 min, the relaxation value
7.3.5 The sample length is not less than 60 times the nominal diameter.
7.3.6 The relaxation rate of 1000 h is allowed to be calculated from the test data
of at least 120 h.
7.4 Size measurement
7.4.1 The height of the transverse rib is the average value of the height of each
column of transverse ribs of the same section. MEASURE the average distance
to determine the distance between transverse ribs, that is, MEASURE the
center distance between the 1st and 11th transverse ribs in the same column
and DIVIDE it by 10, and OBTAIN the average value of distance between
7.4.2 The size measurement shall be accurate to 0.02 mm.
7.5 Measurement of weight deviation
When measuring the weight deviation of steel bar, the sample length shall not
be less than 500 mm. Length measurement shall be accurate to 1 mm. Weight
measurement shall be accurate to 1 g. The weight deviation of steel bar (%)
shall be calculated according to the equation (3).
7.6 Rounding off for values
The rounding off and determination for values of the inspection results shall
conform to the provisions of YB/T 081.
8.1 Inspection and acceptance
Weight deviation
Actual weight of sample - (length of sample x theoretical weight)
Length of sample x theoretical weight
The inspection and acceptance of steel bar shall be carried out by the Quality
Supervision Department of the supply party. The demand party shall have the
right to inspect.
8.2 Batching rules
The steel bars shall be inspected and accepted in batches. Each batch shall be
specification, same production process, and same delivery state. Each batch
shall not be more than 60 t.
8.3 Sampling quantity
The sampling quantity of the inspection of steel bar shall be in accordance with
the provisions of Table 5.
8.4 Rules for re-inspection and determination
The rules for re-inspection and determination of steel bar shall conform to the
provisions of GB/T 17505.
9 Packaging, marking, and quality certificate
lines. The end socket shall be bent into the coil.
9.2 The steel bar shall be rolled with obvious designation-marks. The distance
between marks is twice that between transverse ribs; one transverse rib within
the distance between marks shall be deleted, as shown in Figure 4. It shall add
a short transverse rib within the third distance between marks to high-
elongation cold rolled ribbed steel bars, as shown in Figure 5. Steel bars can
also be rolled with the factory name or logo.
9.3 There shall be not less than two signs hanging on each coil (bundle) of steel
bars, which indicate the manufacturer, date of production, designation-number
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