包钢CSP生产线生产540 MPa级热轧双相钢

介绍了在包钢CSP生产线研制540 MPa级热轧双相钢的工业化生产试验.采用C-Mn钢为原料,分别利用原层流冷却能力和超快冷设备,通过控制轧制和控制冷却工艺,成功开发出540 MPa级热轧双相钢160 t.试制的钢带具有屈服强度低、屈强比小、伸长率大、n值高及低温冲击韧性良好等特点,并具有拉伸曲线无屈服平台、马氏体呈岛状均匀分布在铁素体晶界上等典型双相钢的特征.经汽车制造厂试用,制成了汽车横梁和重型翻斗车护板等构件.     

酒钢CSP开发540MPa双相钢的可行性分析

本文叙述了酒钢CSP的概况，并针对酒钢CSP的现状生产540MPa双机钢的可行性进行了分析。     

酒钢CSP 550 MPa级热轧高强钢强度失效分析

主要针对酒钢CSP 550 MPa级热轧高强钢带研发初期出现的强度指标失效问题,通过与汽车大梁钢带510 L化学成分、轧制工艺、晶粒度差异性分析对比,确定了酒钢CSP 550 MPa级热轧高强钢带强度失效的主要原因,后续通过工艺优化及时纠偏,实现酒钢500 MPa热轧高强钢带的成功开发。     

CSP流程生产经济型热轧双相钢的工艺与组织性能

 为了在CSP产线上开发新一代经济型热轧双相钢,并确定生产的最佳成分和工艺,介绍了在武钢CSP生产线进行580MPa级热轧双相钢的工业化生产试制情况。分别采用C-Mn-Si系和C-Mn-Si-Cr系钢为原料,通过控制轧制和基于超强冷却设备的控制冷却工艺,成功开发出抗拉强度580MPa级热轧双相钢。通过比较分析2种成分钢的力学性能和微观组织,结果表明：经济型的C-Mn-Si系钢相对于C-Mn-Si-Cr系钢具有屈服强度低、屈强比小、伸长率大的特点,虽然马氏体量相对较少,但具有马氏体呈岛状更加均匀分布在铁素体晶界上等典型双相钢的特征,同时提出了生产过程中控制铁素体析出量和促进马氏体形成的具体措施。     

冷却模式对CSP线生产热轧双相钢DP600的影响

针对酒钢CSP线,设计了600 MPa级热轧双相钢的化学成分,测定了其动态CCT曲线.根据动态CCT曲线,分别采用三段式与两段式冷却模式进行了现场试制,对试制热轧板进行了显微组织观察与力学性能检测.结果表明:通过化学成分的合理设计及关键工艺参数的合理控制,热轧板的显微组织为铁素体+马氏体,屈服强度均达到325 MPa以...     

短流程CSP生产线超快冷生产工艺的开发与应用

文章基于短流程CSP生产线,开发了适合热轧双相钢的超快冷生产工艺,并且实现了该生产工艺的工业应用。结果表明:随着终轧温度降低,铁素体晶粒细化,抗拉强度升高;随着中间温度降低,铁素体晶粒细化,抗拉强度降低;获得合理的工艺参数,终轧温度为840℃,中间温度为670℃,卷取温度为170℃。所生产6.0 mm厚度540 MPa级热轧双相钢的显微组织为铁素体和马氏体,屈服强度为330～360 MPa,抗拉强度为560～590 MPa,延伸率为30%～36%,很好地满足了产品需求。     

包钢CSP“超快冷”系统及590MPa级C-Mn低成本热轧双相钢开发

介绍了包钢CSP线"超快冷"系统的建立和运行情况.在包钢CSP线采用轧后层流冷却和"超快冷"工艺,开发出厚度4～11 mm的590 MPa级C-Mn低成本热轧双相钢.主要力学性能优良,抗拉强度590～620 MPa,屈强比0.62～O.67,伸长率26%～36%,,n值0.21.简要分析了"超快冷"工艺对双相钢组织形成的作用.     

600 MPa级热轧双相钢的研制与开发

为了满足汽车制造轻量化的行业需求,针对微合金化作用及控轧控冷工艺对双相钢组织和性能的影响展开研究,成功开发抗拉强度600 MPa级的热轧双相钢。生产实践表明,采用低C-Mn钢添加微合金元素Nb、Ti、Cr的成分优化设计,并结合控轧控冷工艺,所生产的600 MPa级热轧双相钢具有铁素体和马氏体两相组织结构,各项力学性能满足汽车用600 MPa级热轧双相钢要求。     

CSP热轧低碳钢的强化机制研究

研究了CSP热轧低碳SPHC钢的微观组织、第二相粒子的析出及其对强度的影响,对马钢CSP生产的SPHC钢和常规热轧工艺的SPHC钢进行了屈服强度比较.结果表明,马钢SPHC钢的实测值比计算值高42MPa,常规工艺生产的SPHC钢实测值与计算值比较接近.对马钢SPHC钢进行透射电镜观察,观察到其中存在纳米级的、亚微米级的和微米级的3种尺寸级别的第二相粒子,马钢SPHC钢沉淀强化的强度增量为40 MPa.     

包钢开发出汽车用钢新品种

包钢与东风汽车车轮有限公司达成了热轧双相钢批量供货意向,制作汽车大梁、轮辐等汽车零部件,标志着包钢利用CSP生产线生产热轧双相钢获得成功,开创了世界CSP生产低成本、环保型热轧双相钢带的先河。     

Development of A Series NV-F Grade Extra High Strength Plate Steels for Offshore Structure and Shipbuilding

Systematic research on developing a series of extra high strength steel plates for shipbuilding via thermomechanical control process (TMCP) is introduced.A microalloyed low carbon-equivalent SiMnCrNiCu steel was used to develop F460 steel.Ultra low carbon Cu-Ni containing steels were used to develop NV-F550,NV-F620 and NV-F690 steel plates.The effect of TMCP parameters on microstructure and properties was investigated by test-scale plant trials.Industrial production trials were conducted to verify the validity of the laboratory studies on the F460 steel.Heavy plates in 45-60 mm thickness met Det Norske Veritas NV-F460 specification.The effect of heat-input on the mechanical properties of the coarse-grained-heat-affect-zone (CGHAZ) of the advanced heavy plates was studied.     

连铸准沸腾碳素焊条钢的生产实践

传统的炼钢生产中多采用沸腾钢模铸工艺生产碳素焊条钢，随着连续铸钢工艺的普及，由于沸腾钢钢水的化学成分及凝固特点，使连铸生产沸腾钢存在一定困难，本试验采用以铝锰铁合金为主，辅以硅钙合金对转炉冶炼的碳素焊条钢钢水脱氧，使钢水达到准沸腾的平衡状态，实现了碳素焊条钢的连铸生产，成功开发了H08（A、E）碳素焊条钢。     

960 MPa Grade High Performance Weldable Structural Steel Plate Processed by Using TMCP

To develop high strength, good toughness, and weldable steel plate, a steel composition was designed. It was an uhra-low-carbon microalloyed steel. TMCP (thermal mechanical control process) and RPC (relaxation pre-cipitation control) were employed to ensure fine lath bainite microstructure. This kind of microstructure could induce higher strength and better toughness.     

800MPa级超细晶粒钢研究现状和发展趋势

800MPa 级超细晶粒钢是通过多向变形热处理,大角度交叉轧制,大变形应变诱导动态相变和 铁素体动态相变,大变形诱导铁素体相变,弛豫析出控制相变,促进针状铁素体形成等轧制技术,将钢中的晶 粒尺寸由10 μm 降到1 μm 以下,从而达到高强韧性的一种低碳(0.05%C)微合金化钢。介绍了国内外800MPa级超细晶粒钢的理论研究、生产工艺和焊接技术的新进展和今后发展趋势。     

Studies on Direct Laser Cladding of SiC Dispersed AISI 316L Stainless Steel

In the present study, attempts have been made to develop SiC dispersed (5 and 20 wt pct) AISI 316L stainless steel matrix composite by direct laser cladding with a high power diode laser. Direct laser cladding has been carried out by melting the powder blends of AISI 316L stainless steel and SiC (5 and 20 wt pct) and, subsequently, depositing it on mild steel (0.15 pct C steel) in a layer by layer fashion to develop a coupon of 100 mm² × 10 mm dimension. A continuous, defect-free (microcracks and micro- or macroporosities), and homogeneous microstructure is formed, which consists of a dispersion of partially dissolved SiC (leading to formation of very low fraction of Cr₃C₂ and Fe₂Si) in grain-refined austenite. The microhardness of the clad layer increases from 155 VHN to 250 to 340 VHN (for 5 wt pct SiC dispersed) and 450 to 825 VHN (for 20 wt pct SiC dispersed) as compared to 155 VHN of commercially available AISI 316L stainless steel. The corrosion rate in 3.56 wt pct NaCl solution is significantly reduced in 5 wt pct SiC dispersed steel; however, 20 wt pct SiC dispersed steel showed a similar behavior as the commercially available AISI 316L stainless steel. The processing zone for the development of a defect-free microstructure with improved properties has been established.     

智慧钢铁工厂的互联网＋CPPS模式

结合钢铁产业结构特点,介绍智慧工厂和CPS系统（信息物理系统）的概念,论述中国钢铁行业建设智能工厂的技术思路,探讨钢铁智慧工厂的互联网＋CPPS模式（具有互联网思维与概念的信息物理生产系统）设计理念。中国钢铁企业智慧工厂建设可以从采用互联网＋CPPS模式推进钢铁企业制造体系的纵向集成、通过价值链及网络实现企业间横向集成和发展生产流与人机交互的端到端工程数字化集成三方面来考虑。智慧钢铁工厂的互联网＋CPPS模式对钢铁企业的转型升级和发展进步具有重要的现实意义。     

Coating of a steel wire with copper

The process of coating of a steel wire with liquid copper at a high speed (>1 m/s) is considered. The results of long-term studies of copperizing under laboratory conditions and electron-microscopic investigation of the copper–steel adhesion are used to develop a mathematical model for coating of a steel wire with copper and to create a commercial setup to implement this process.     

直接还原铁在电弧炉炼钢中的应用

对直接还原铁 (DRI)性能及其在电弧炉冶炼的特性作了较全面的论述。了解和掌握其特性是发挥其优越性的关键 ,是发展特殊钢和纯净钢的重要途径。     

Effect of Heat Treatment Process on Properties of 1000 MPa Ultra-High Strength Steel

 Two types of steel, C-Mn-Cr-Mo-B microalloyed steel and C-Mn-Mo-Nb-Cu-B microalloyed steel, are designed to develop 1000 MPa ultra-high strength steel. Two kinds of processes, thermomechanical controlled process (TMCP) combined with traditional off-line quenching and tempering (QT) process versus controlled rolling process (CR) combined with direct quenching and tempering (DQ+T) process, are applied. The effect of heat treatment processing mode on the microstructure and mechanical properties is studied. The relationship between microstructure and mechanical properties is investigated by SEM and TEM. After tempering at 450 to 550 ℃ for 1 h, the steel produced by TMCP+QT process shows combination of excellent strength and low temperature toughness. The yield strength is above 1000 MPa, elongation above 15% and impact energy at -40 ℃ more than 30 J. After tempering at 450 ℃, a large number of ε-Cu particles precipitated in C-Mn-Mo-Nb-Cu-B steel produced by CR+DQ+T process lead to a significant increase in yield strength. And after tempering at 500 to 600 ℃, the yield strength of the steel is further improved to 1030 MPa because of precipitates, such as nitride or carbide of niobium, carbide of molybedenum and vanadium. When the tempering temperature is increased above 620 ℃, the yield strength is still higher than 1000 MPa and elongation is above 20% and impact energy at -40 ℃ is more than 35 J. After tempering at above 500 ℃, the toughness of the steel treated by TMCP+QT process is superior to that of steel by CR+DQ+T process.     

纳米贝氏体的热力学分析及强韧化研究

针对目前高碳高硅低温贝氏体(纳米结构贝氏体)相变速度缓慢的现状,采用贝氏体相变热力学理论分析主要合金元素对低温贝氏体相变驱动力的影响,设计了新型纳米结构贝氏体钢成分0.83C-2.44Si-0.43Mn-0.73Al.利用膨胀仪研究该成分贝氏体钢在不同温度下的相变整体动力学,综合使用扫描电子显微镜、X射线衍射、电子背散射衍射等方法研究热处理工艺对实验钢组织和力学性能的影响.结果表明,350℃等温转变贝氏体的抗拉强度为1401 MPa,延伸率为42.21%,强塑积可达59136 MPa·%,在室温拉伸过程中发生明显的相变诱导塑性效应;230℃等温转变组织中贝氏体铁素体片层厚度小于100 nm,抗拉强度达2169 MPa.