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钢筋混凝土用钢 第2部分：热轧带肋钢筋
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GBT 1499.2-2018
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标准编号: GB/T 1499.2-2018 (GB/T1499.2-2018)
中文名称: 钢筋混凝土用钢 第2部分：热轧带肋钢筋
英文名称: Steel for the reinforcement of concrete -- Part 2: Hot rolled ribbed 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: 26,217
发布日期: 2018-02-06
实施日期: 2018-11-01
起草单位: 中冶建筑研究总院有限公司、冶金工业信息标准研究院、首钢长治钢铁有限公司、山东钢铁股份有限公司莱芜分公司、江苏沙钢集团有限公司、武钢集团昆明钢铁股份有限公司、福建省三钢(集团)有限责任公司、济钢集团有限公司、江苏永钢集团有限公司、河北津西钢铁集团股份有限公司、河北敬业钢铁有限公司、中天钢铁集团有限公司、江苏申特钢铁有限公司、抚顺新钢铁有限责任公司、唐山东华钢铁企业集团有限公司、江苏省镔鑫钢铁集团有限公司、钢铁研究总院
归口单位: 全国钢标准化技术委员会(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
GB/T 1499.2-2018: 钢筋混凝土用钢 第2部分：热轧带肋钢筋
GB/T 1499.2-2018 英文名称: Steel for the reinforcement of concrete -- Part 2: Hot rolled ribbed bars
1 范围
GB/T 1499的本部分规定了钢筋混凝土用热轧带肋钢筋(以下简称钢筋)的术语和定义、分类、牌
号、订货内容、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、标志和质量证明书等。
本部分适用于钢筋混凝土用普通热轧带肋钢筋和细晶粒热轧带肋钢筋。
本部分不适用于由成品钢材再次轧制成的再生钢筋及余热处理钢筋。
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 222 钢的成品化学成分允许偏差
GB/T 223.5 钢铁 酸溶硅和全硅含量的测定 还原型硅钼酸盐分光光度法
GB/T 223.11 钢铁及合金 铬含量的测定 可视滴定或电位滴定法
GB/T 223.12 钢铁及合金化学分析方法 碳酸钠分离-二苯碳酰二肼光度法测定铬量
GB/T 223.14 钢铁及合金化学分析方法 钽试剂萃取光度法测定钒含量
GB/T 223.19 钢铁及合金化学分析方法 新亚铜灵-三氯甲烷萃取光度法测定铜量
GB/T 223.23 钢铁及合金 镍含量的测定 丁二酮肟分光光度法
GB/T 223.26 钢铁及合金 钼含量的测定 硫氰酸盐分光光度法
GB/T 223.37 钢铁及合金化学分析方法 蒸馏分离-靛酚蓝光度法测定氮量
GB/T 223.40 钢铁及合金 铌含量的测定 氯磺酚S分光光度法
GB/T 223.59 钢铁及合金 磷含量的测定 铋磷钼蓝分光光度法和锑磷钼蓝分光光度法
GB/T 223.63 钢铁及合金化学分析方法 高碘酸钠(钾)光度法测定锰量
GB/T 223.85 钢铁及合金 硫含量的测定 感应炉燃烧后红外吸收法
GB/T 223.86 钢铁及合金 总碳含量的测定 感应炉燃烧后红外吸收法
GB/T 2101 型钢验收、包装、标志及质量证明书的一般规定
GB/T 4336 碳素钢和中低合金钢 多元素含量的测定 火花放电原子发射光谱法(常规法)
GB/T 4340.1 金属材料 维氏硬度试验 第1部分:试验方法
GB/T 6394 金属平均晶粒度测定法
GB/T 13298 金属显微组织检验方法
GB/T 17505 钢及钢产品 交货一般技术要求
GB/T 20066 钢和铁 化学成分测定用试样的取样和制样方法
GB/T 20123 钢铁 总碳硫含量的测定 高频感应炉燃烧后红外吸收法(常规方法)
GB/T 20124 钢铁 氮含量的测定 惰性气体熔融热导法(常规方法)
GB/T 20125 低合金钢 多元素含量的测定 电感耦合等离子体原子发射光谱法
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
JGJ18 钢筋焊接及验收规程
JGJ107 钢筋机械连接技术规程
3 术语和定义
下列术语和定义适用于本文件。
3.1
普通热轧钢筋
按热轧状态交货的钢筋。
3.2
细晶粒热轧钢筋
在热轧过程中,通过控轧和控冷工艺形成的细晶粒钢筋,其晶粒度为9级或更细。
3.3
带肋钢筋
横截面通常为圆形,且表面带肋的混凝土结构用钢材。
3.4
纵肋
平行于钢筋轴线的均匀连续肋。
3.5
横肋
与钢筋轴线不平行的其他肋。
3.6
月牙肋钢筋
横肋的纵截面呈月牙形,且与纵肋不相交的钢筋。
3.7
公称直径
与钢筋的公称横截面积相等的圆的直径。
3.8
相对肋面积
横肋在与钢筋轴线垂直平面上的投影面积与钢筋公称周长和横肋间距的乘积之比。
3.9
肋高
测量从肋的最高点到芯部表面垂直于钢筋轴线的距离。
3.10
肋间距
平行钢筋轴线测量的两相邻横肋中心间的距离。
3.11
特征值
在无限多次的检验中,与某一规定概率所对应的分位值。
3.12
基圆
钢筋横截面上不包括橫肋和纵肋的横截面。
4 分类、牌号
4.1 钢筋按屈服强度特征值分为400、500、600级。
4.2 钢筋牌号的构成及其含义见表1。
5 订货内容
a) 本部分编号;
b) 产品名称;
c) 钢筋牌号;
d) 钢筋公称直径、长度及重量(或数量、或盘重);
e) 特殊要求。
6 尺寸、外形、重量及允许偏差
6.1 公称直径范围
钢筋的公称直径范围为6mm~50mm。
6.2 公称横截面面积与理论重量
6.3 钢筋的表面形状及尺寸允许偏差
6.3.1 钢筋横肋设计原则应符合以下规定:
a) 横肋与钢筋轴线的夹角β应不小于45°,当该夹角β不大于70°时,钢筋相对两面上横肋的方向
应相反。
b) 横肋公称间距不得大于钢筋公称直径的0.7倍。
c) 横肋侧面与钢筋表面的夹角α不得小于45°。
d) 钢筋相邻两面上横肋末端之间的间隙(包括纵肋宽度)总和应不大于钢筋公称周长的20%。
e) 当钢筋公称直径不大于12mm时,相对肋面积不小于0.055;公称直径为14mm和16mm
时,相对肋面积不小于0.060;公称直径大于16mm时,相对肋面积不小于0.065。相对肋面积
6.3.2 钢筋通常带有纵肋,也可不带纵肋。带有纵肋的月牙肋钢筋,其外形如图1所示,尺寸及允许偏
差应符合表3的规定。
6.3.3 钢筋实际重量与理论重量的偏差符合表4规定时,钢筋内径偏差不作交货条件。
6.3.4 不带纵肋的月牙肋钢筋,其内径尺寸可按表3的规定作适当调整,但重量允许偏差仍应符合表4的规定。
6.4 长度及允许偏差
6.4.1 长度
6.4.1.1 钢筋通常按定尺长度交货,具体交货长度应在合同中注明。
6.4.1.2 钢筋可以盘卷交货,每盘应是一条钢筋,允许每批有5%的盘数(不足两盘时可有两盘)由两条
钢筋组成。其盘重由供需双方协商确定。
钢筋按定尺交货时的长度允许偏差为+50 0mm。
6.5 弯曲度和端部
直条钢筋的弯曲度应不影响正常使用,每米弯曲度不大于4mm,总弯曲度不大于钢筋总长度的
0.4%。
钢筋端部应剪切正直,局部变形应不影响使用。
6.6 重量及允许偏差
6.6.1 钢筋可按理论重量交货,也可按实际重量交货。按理论重量交货时,理论重量为钢筋长度乘以表2中钢筋的每米理论重量。
6.6.2 钢筋实际重量与理论重量的允许偏差应符合表4的规定。
7 技术要求
钢应采用转炉或电弧炉冶炼,必要时可采用炉外精炼。
7.2 牌号和化学成分
7.2.1 钢筋牌号及化学成分和碳当量(熔炼分析)应符合表5的规定。根据需要,钢中还可加入V、Nb、Ti等元素。
7.2.2 碳当量Ceq(%)可按式(1)计算:
7.2.3 钢的氮含量应不大于0.012%,供方如能保证可不作分析。钢中如有足够数量的氮结合元素,含氮量的限制可适当放宽。
7.2.4 钢筋的成品化学成分允许偏差应符合GB/T 222的规定,碳当量Ceq的允许偏差为+0.03%。
7.3 交货型式
钢筋通常按直条交货,直径不大于16mm的钢筋也可按盘卷交货。
7.4 力学性能
GB/T 1499.2-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Replacing GB/T 1499.2-2007
Steel for the reinforcement of concrete -
Part 2. Hot rolled ribbed bars
(ISO 6935-2.2015, Steel for the reinforcement of concrete -
Part 2. Ribbed bars, NEQ)
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. NOVEMBER 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 9
4 Classification, grade ... 11
5 Order content ... 11
6 Dimension, shape, weight and tolerance ... 12
6.1 Nominal diameter range ... 12
6.2 Nominal cross-sectional area and theoretical weight ... 12
6.3 Surface shape and dimension tolerances of bars ... 12
6.4 Length and tolerance ... 16
6.5 Curvature and end ... 16
6.6 Weight and tolerance ... 16
7 Technical requirements ... 17
7.1 Smelting method ... 17
7.2 Grades and chemical composition ... 17
7.3 Delivery type ... 18
7.4 Mechanical properties ... 18
7.5 Process performance ... 19
7.6 Fatigue performance ... 19
7.7 Connection performance ... 19
7.8 Grain size ... 20
7.9 Metallographic structure ... 20
7.10 Surface quality ... 20
8 Test methods ... 20
8.1 Inspection items ... 20
8.2 Tensile, bending, reverse bending test ... 22
8.3 Dimension measurement ... 22
8.4 Measurement of weight deviation ... 23
8.5 Macroscopic metallography, cross-section Vickers hardness,
microstructure inspection ... 23
8.6 Rounding off of numerical values ... 23
9 Inspection rules ... 23
9.1 Inspection classification ... 23
9.2 Characteristic value inspection ... 23
9.3 Delivery inspection ... 24
10 Packaging, marking, and quality certificate ... 24
Annex A (informative) Calculation formula for specific projected rib area of bars
... 26
Annex B (normative) Macroscopic metallography, cross-section Vickers
hardness, microstructure of bars and inspection methods ... 27
Annex C (normative) Characteristic value inspection rules ... 30
Foreword
GB/T 1499 “Steel for the reinforcement of concrete” consists of three parts.
- Part 1. Hot rolled plain bars;
- Part 2. Hot rolled ribbed bars;
- Part 3. Welded fabric.
This Part is Part 2 of GB/T 1499.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 1499.2-2007 “Steel for the reinforcement of concrete -
Part 2. Hot rolled bars”.
Compared with GB/T 1499.2-2007, the main changes of this Part are as follows.
- CANCEL the 335 MPa grade bar;
- ADD the 600 MPa grade bar;
- ADD the bars of which the grade is with E;
- Appropriately TIGHTEN the length tolerance and curvature;
- Appropriately TIGHTEN the weight tolerance, making it clear that the weight
tolerance does not allow reinspection;
- REQUIRE the reverse bending test of bars of which the grade is with E AS
a routine inspection item;
- ADD the specifications for the fatigue test method for bars;
- ADD macroscopic metallography, cross-section Vickers hardness,
microstructure, and their inspection methods;
- ADD the measurement method for the gap at the end of transverse ribs;
- The surface marking is changed from the “Registered factory name (or
trademark)” TO “The serial number of the production license of hot rolled
bar products obtained by the enterprise (the last 3 digits)”; DELETE “For
bars with a nominal diameter not greater than 10 mm, the marking may be
Steel for the reinforcement of concrete
- Part 2. Hot rolled ribbed bars
This Part of GB/T 1499 specifies the terms and definitions, classification, grade,
order content, dimension, shape, weight and tolerance, technical requirements,
test methods, inspection rules, packaging, marking and quality certificate of hot
rolled ribbed bars for the reinforcement of concrete (hereinafter referred to as
bars).
This Part applies to hot rolled ribbed bars and hot rolled ribbed bars of fine
grains for the reinforcement of concrete.
This Part does not apply to re-rolled bars and residual heat-treated bars rolled
from finished steel.
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total
silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content -
Visual titration or potentiometric titration method
sodium carbonate separation-diphenyl carbazide photometric method for the
determination of chromium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N-
benzoy-N-phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy - The
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content
- Infrared absorption method after combustion in an induction furnace
(routine method)
conductimetric method after fusion in a current of inert gas (routine method)
GB/T 20125 Low-alloy steel - Determination of multi-element contents -
Inductively coupled plasma atomic emission spectrometric method
GB/T 28900 Test methods of steel for reinforcement of concrete
YB/T 081 Rule for rounding off of numerical values and judgement of testing
values for technical standards of metallurgy
JGJ 18 Specification for welding and acceptance of reinforcing steel bars
JGJ 107 Technical specification for mechanical splicing of steel reinforcing
bars
For the purpose of this document, the following terms and definitions apply.
3.1
hot rolled bars
Bars delivered in hot rolled condition.
3.2
hot rolled bars of fine grains
In the hot rolling process, bars of fine grains formed by controlled rolling and
controlled cooling processes, having a grain size of level 9 or finer.
3.3
Steel for concrete structures, of which the cross-section is usually round and
the surface is with ribs.
3.4
longitudinal rib
θ - longitudinal rib angle;
a - longitudinal rib top width;
l - transverse rib spacing;
b - transverse rib top width;
fi - transverse rib end gap.
shape of crescent ribbed bar (with longitudinal ribs)
6.4 Length and tolerance
6.4.1 Length
6.4.1.1 Bars are usually delivered in cut length. The specific delivery length
shall be specified in the contract.
6.4.1.2 Bars may be delivered in coils. Each coil shall consist of a bar. It is
allowed that there are 5 % of the number of coils (two coils when there are less
than two coils) consisting of two bars in each batch. The coil weight is agreed
upon between supply and demand parties.
The tolerance of the length of the bars delivered in cut length is 50 0 mm.
6.5 Curvature and end
The curvature of straight bars shall not affect normal use. The curvature per
meter is less than 4 mm. The total curvature is not more than 0.4 % of the total
length of the bar.
The end of bars shall be cut straight, and local deformation shall not affect use.
6.6 Weight and tolerance
6.6.1 Bars may be delivered in theoretical weight, or in actual weight. When
delivered in theoretical weight, the theoretical weight is the length of the bar
6.6.2 The tolerance of the actual weight and the theoretical weight of bars shall
comply with the specifications of Table 4.
and joints of bars shall comply with the specifications of relevant standards such
as JGJ 18, JGJ 107.
7.7.2 The welding process of HRBF500 and HRBF500E bars shall be
determined by tests.
7.7.3 It is recommended to connect HRB600 bars using mechanical connection.
7.8 Grain size
The actual grain size of hot rolled bars of fine grains is Level 9 or finer. If this is
7.9 Metallographic structure
The metallurgical structure of bars shall be mainly ferrite plus pearlite, and
tempered martensite shall not appear on the core. The macroscopic metallurgy,
cross-section Vickers hardness and microstructure of bars shall comply with
the specifications of Annex B. If they are guaranteed by the supply party, the
inspection may be exempted.
7.10 Surface quality
7.10.1 Bars shall be free from harmful surface defects.
7.10.2 When the weight, dimension, cross-sectional area and mechanical
Clauses 6 and 7, the scales, surface irregularities or oxide scales are not
regarded as the reason for rejection.
7.10.3 When specimens with surface defects other than those specified in
7.10.2 do not meet the mechanical properties or process performance
requirements, the defects are considered to be harmful.
8 Test methods
8.1 Inspection items
8.1.1 The inspection items, sampling methods and test methods for each batch
of bars shall comply with the specifications of Table 8.
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