-High Strength Cold Forming / -Hot-rolled Steel a

High Strength Cold Forming Hot-rolled Steel BS系列高强钢简介 Brief Introduction 开发历史 The Development of BS Series Steels High strength steel (HSS) and Ultra-high strength steel (UHSS) for 在国内率先开发成功的一类热轧新产品， 牌号大多采 用 “BS” 开头， 如第一代高强钢BS600MC和BS700MC已 大量应用于工程机械、 集装箱制造等行业。 2005年宝 钢开发成功具有优良低温韧性的第二代高强钢， 牌号 为BS700MCK2、 BS600MCK4、 BS550MCK4等等。 BS系 列高强钢为低碳低合金结构钢， 具有良好的可焊接性 和冷成形性， 可广泛应用于工程机械、 车辆结构、 集装 箱等制造行业。 construction machinery were first developed in China by Baosteel in 2000. These high strength cold forming hot-rolled steels (BS series steels), mostly initialed by “BS”, such as Type I BS steels, BS600MC...

选用高强钢代替传统产品可显著减小钢板的设计厚度， 进 而减轻结构的自重。 除此之外， BS系列高强钢还具有如下 特点： 制造工艺及交货状态 生产工艺流程： BS系列高强钢采用氧气转炉冶炼镇静钢， 经过二次精炼后 进行连续铸造， 连铸坯送热轧厂再加热并采用控轧控冷工 艺轧制成卷， 精整检验后可以钢卷状态交货， 也可以矫直 头的性能优良； • 良好的低温冲击韧性。 交货状态： BS系列高强钢采用轧态 （TMCP） 交货。 The designed thickness of the plates in a structure can be reduced without loss of load-bearing capability by switching from Manufacture Process and Delivery Condition conventional steels to high strength steels, thus the tare weight Manufacture process: of the structure can be reduced. This is one of the major benefits The BS series steels are killed in oxygen converter. After secondary...

High Strength Cold Forming Hot-rolled Steel 牌号及可供规格范围 Product Range of Dimensions 宝钢BS系列热轧高强钢可供规格如图表所示， 超出规格范围可与我们联系。 The available size of BS series steels is as shown in the table below. Contact us if the required size is out of range. 牌号 Steel grade

供货技术条件及产品性能实绩 Technical Delivery Conditions and Typical Properties 第一代BS高强钢按照宝钢企业标准Q/BQB311或按照供货技术协议BXYZ2008－018执行， 第二代BS高强钢按照宝钢新产品 试制协议书BKJ系列执行。 两代之间的差别在于 第一代产品不提供冲击性能保证， ， 第二代产品提供低温冲击性能保证， 以K2、 J4等后缀作为区分， 详见供货技术条件力学性能表格。 Type I BS series steels are delivered according to Q/BQB 311 or BXYZ2008-018 while Type II according to BKJ technical specifications. The difference between Type I and Type II is that Type I steels do not guarantee the impact energy while Type II steels guarantee a low temperature toughness, which is shown with suffix K2, J4, etc. 屈服强度等级 Minimum yield strength 控轧控冷 （非调质） 生产的冷成型用钢...

High Strength Cold Forming Hot-rolled Steel 力学性能交货标准 Delivery Conditions of Mechanical Properties 牌 号 Steel grade Tensile test Bending test T=Transverse，试样方向垂直于轧制方向; L=Longitude，试样方向平行于轧制方向。 拉伸试样采用短比例标距。标距 ,屈服强度采用上屈服强度，屈服现象不明显时，采用RP0.2。 冲击试样采用夏比V型缺口试样，表中冲击值为一组三个试样的平均值，表中冲击值适用于10×10×55标准尺寸试样，当板 厚＜12mm采用5mm或7.5mm厚度冲击试样时，表中冲击值等比例减小。 Remarks: (1) T=Transverse, specimen direction is perpendicular to the rolling direction; L=Longitude, specimen direction is parallel to the rolling direction. (2) A short gauge length specimen (L0=5.65√S0) is adopted in the tensile test. For the specified yield strength,...

典型力学性能实绩 Typical Mechanical Properties 宝钢BS系列高强钢于2000年研发成功以来， 已批量生产约55万吨， 实物性能检验值的80％以上在表列波动范围以内。 More than 550,000 tons BS series steels have been produced after the development in 2000. 80% of the actual properties of the product are within the value given in the table below: 牌 号 Steel grade 化学成分 Composition wt% 强度级别 Minimum yield strength Steel grade

High Strength Cold Forming Hot-rolled Steel 焊接及加工 Machining and Welding 焊 宝钢BS系列热连轧高强钢通过低碳低合金设计降低钢的碳当量和焊接裂纹敏感性指数， 并采用先进的冶炼装备技术结 合微合金强化技术， 获得良好的可焊接性。 Welding BS series steels has low carbon equivalent and low weld crack sensitivity index obtained from low carbon and low alloy designing. The steels show good weldability by the use of advanced smelting technology and micro-alloy enhancement technology. 良好的焊接性 — 碳当量及焊接裂纹敏感性指数 Good Weldability carbon equivalent (Ceq) and weld crack sensitivity index (Pcm) 牌 号 Steel grade Welding Crack Sensitivity Test Controlled thermal severity cracking test (CTS)...

Welding Parameters When air temperature is higher than 0ºC, no preheating is needed before welding and the welding crack might not be found in the joints. MAG welding is recommended, with shielding gas of 80%Ar+20%CO2 and gas flow of 18-25l/min. The recommended filler metal wires can be used in all-position welding. Vertical position welding should utilize the welding direction from the bottom to top, so the welding cracks could be avoided. Common joint forms, such as butt joint, corner joint and lap joint could be used on high strength steels. Normal forms of the grooves include I-groove, V-groove...

High Strength Cold Forming Hot-rolled Steel Filler Metals 在接头力学性能满足构件要求的情况下， BS高强钢的配套 When the mechanical properties could meet the component requirements, it is better to select lower strength filler metals 匹配焊接材料的选用。 尤其是对于角接接头时， 稍低匹配 during welding BS high strength steels. It is especially important to use low-matched welding materials for corner joints. 宝钢通过先进的冶炼技术， 成功生产出优质MAG焊丝用 Baosteel has successfully produced high-quality wire rods for high strength steel through advanced smelting technology, including 洋、 湖北猴王、 武汉铁锚、 上海宝煊等国内主要焊接材料 BH600-II, BH700-II and BH800-II. These rods have been...

宝钢BS系列热连轧高强钢可选用的焊接材料详见下表。 Welding consumables for BS high strength hot-rolled steels could be shown as follows. 牌 号 Steel grade Wire manufacturer Wire diameter 上海大西洋、 湖北猴王、 武汉铁锚、 上海宝煊等国内主要焊接材料生产 企业 Shanghai Atlantic welding consumables Co.,Ltd., Hubei KMK welding Φ1.2-1.6mm materials Co., Ltd., Wuhan Temo welding consumables Co., Ltd. and Shanghai Baoxuan metal products Co., Ltd. 焊接接头的力学性能 Results of mechanical tests of welded joints 牌 号 Steel grade (Thickness) 试验用焊丝 Wire Heat input (KJ/cm) Tensile test 抗拉强度 Fracture position

High Strength Cold Forming Hot-rolled Steel Cold Forming BS系列高强结构钢不仅具有高强度， 同时还具有良好的塑 With high strength and good formability, BS series steels are 性， 适合冷弯加工成形。 对于高强钢来说， 折弯半径是冷 弯成型工艺的基本参数， 应予以关注， 建议折弯内径不要 小于供货技术条件规定的弯心直径d。 另外需要注意的是， 冷弯结束后高强钢的回弹比普通钢略大， 可能导致高强钢 构件形状出现偏差。 可通过适当的过弯曲来保证获得所需 的折弯角度。 辊压成型时， 单次辊压变形量不宜太大， 通过调整变形 量， 可避免边部开裂。 suitable for cold forming. Attention shall be paid to the bending radius, which is an important parameter for the cold forming of high strength steel. It is suggested the actual bending diameter not less than the diameter specified in the delivery condition. Also to...