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Effects of Rolling Processes on Yield Ratio and Formability of Hot Rolled Gas Cylinder Steel

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Journal of Iron and Steel Research International 2012年第3期19卷 52-55页

作者： JIA Yue-cai1, GUO Hai-rong1, LI Ran2, LI Hua-long1 (1. Institute of Research of Iron and Steel, Jiangsu shagang group, Zhangjiagang 215625, Jiangsu, China 2. Chief Engineering Offices, Jiangsu shagang group, Zhangjiagang 215625, Jiangsu, China) [a] Institute of Research of Iron and Steel Jiangsu Shagang Group Zhangjiagang 215625 Jiangsu China [b] Chief Engineering Offices Jiangsu Shagang Group Zhangjiagang 215625 Jiangsu China

Deep drawing properties of hot rolled gas cylinder steel was investigated by using HP295 steel in terms of microstructure, texture, yield ratio, plastic strain ratio （r value） and plastic anisotropy （Ar）. The grains in the hot strip were largely equiaxed, and the texture was weak, containing a- and ？＇fibre. Reheating temperature, finish roll ing temperature and cooling rate after rolling influenced the ferrite-pearlite band formation significantly, and the yield ratio increased steeply with decreasing coiling temperature below 630 ~C. The anisotropy is relatively high due to re- tained severe ferrite-pearlite band. A mechanism of the band formation due to manganese segregation is elaborated and confirmed validly, from which the measures to avoid the band formation are worked out. Rolling parameters have been optimized by the measures, and industrial production of the gas cylinder steel has been made possible with much improved r-and △r-values, while meeting other specifications.

关键词： yield ratio formability ferrite pearlite band texture plastic anisotropy

Broadside Compensation Rolling Model for Plan View Pattern Control in Wide and Heavy Plate Rolling Process

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Journal of Iron and Steel Research International 2014年第5期21卷 503-508页

作者： Jin-hua RUAN Li-wen ZHANG Sen-dong GU Jian-lin ZHANG Wen-bin HE Shao-hui CHEN School of Materials Science and Engineering Dalian University of Technology Jiangsu shagang group Co. Ltd.

On the basis of a 5 m plate mill, a 3D rigid-plastic finite element （FE） model was developed to investigate changes of plate plan view patterns during hot rolling process. By analyzing the simulation results of conventional rolling processes, it was found that the plate plan view pattern was closely related to broadside rolling ratio. Then, the prediction models for plate plan view patterns were formulated by nonlinear regressive analysis of the simulation results and modified for high accuracy. Based on these models, the broadside compensation rolling method perform- ing at the last pass of broadside rolling phase was designed to decrease plate end crops. Comparing the plate plan view patterns with and without broadside compensation roiling, reduced plate end crops indicate that the broadside compensation roiling model is effective for plate plan view pattern control.

关键词： wide and heavy plate plate plan view pattern broadside compensation roiling method FE simulation

Corrosion Behavior of Cr Micro-alloyed Corrosion-resistant Rebar in Neutral Cl^--containing Environment

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Journal of Iron and Steel Research International 2016年第6期23卷 608-617页

作者： Dan SONG Wei SUN Jin-yang JIANG Han MA Jian-chun ZHANG Zhao-jun CHENG School of Material Science and Engineering Southeast University Nantong Ocean and Coastal Engineering Research Institute Hohai University College of Mechanics and Materials Hohai University Jiangsu shagang group Co. Ltd.

A new low-cost corrosion-resistant rebar（HRB400R）was designed and fabricated by Cr *** HRB400 Rrebar had uniform distribution of Cr element in ferrite *** corrosion behavior of the rebar in the neutral Cl^--containing environment was studied systematically,and the improved corrosion resistance of the HRB400 Rrebar was *** to the corrosion-morphology observation and electrochemical monitoring during the constant immersion corrosion in the 3.5mass% NaCl solution,the HRB400 Rrebar presented alleviated corrosion damage,nobler Ecorr,lower Icorr,and larger Rtvalues,and these phenomena were more remarkable in the initial corrosion *** elevated electrode potential of the rebar,caused by the solid-solution of Cr micro-alloying in the ferrite grains,was the key to the corrosion-resistance *** HRB400 Rrebar also presented much lower mass-loss rate in the salt spray corrosion *** the elevated corrosion resistance of the matrix,the doping and enrichment of Cr element in the rust layer was another factor for the higher corrosion resistance,which retarded the penetration of aggressive medium through the rust layer.

关键词： alloyed systematically ferrite doping spray alloying grains immersion remarkable FeOOH

Effect of Chromium Micro-alloying on the Corrosion Behavior of a Low-carbon Steel Rebar in Simulated Concrete Pore Solutions

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Journal of Wuhan University of Technology(Materials Science) 2017年第6期32卷 1453-1463页

作者：宋丹蒋金洋孙伟 MA Han ZHANG Jianchun CHENG Zhaojun JIANG Jinghua AI Zhiyong School of Materials Science and Engineering Southeast University Nantong Ocean and Coastal Engineering Research Institute Hohai University College of Mechanics and Materials Hohai University Suqian Research Institue Hohai University Jiangsu shagang group Co. Ltd

A new low-cost corrosion-resistant rebar（HRB400 R） was designed and fabricated by chromium micro-alloying. The effects of Cr on the passivation and corrosion behavior of this rebar in the simulated concrete pore solutions were studied systematically, and its improved corrosion resistance was revealed. In the Cl--free saturated Ca（OH）_2 solution, the HRB400 R rebar presented nearly the same passive film and similar passivation ability compared to the common carbon steel rebar. In the long-term immersion corrosion test in the Cl--contained Ca（OH）_2 solution, the HRB400 R rebar presented improved corrosion resistance and obvious longer passivation-maintaining period. Micro-alloying of Cr element in the rebar matrix enhanced its corrosion resistance against Cl--attack and retarded the corrosion initiation in the matrix. In the alkaline Na Cl salt spraying test, the HRB400 R rebar also presented obviously lower mass-loss rate. The enrichment of Cr element in the rust layer improved its retardant effect to the penetration of aggressive medium, and decreased the corrosion propagation rate of the rebar.

关键词： Cr micro-alloying corrosion-resistant rebar improved corrosion resistance simulatedconcrete pore solutions

A Study of Rust Layer of Ultra-Thin Cast Strip Steel Containing 0.10%Sb in Simulated Industrial Atmosphere

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Acta Metallurgica Sinica(English Letters) 2023年第8期36卷 1371-1384页

作者： Long Chen Xintong Lian Zhong Xi Tengshi Liu Qingxiao Feng Hualong Li Yixin Shi Han Dong School of Materials Science and Engineering Shanghai UniversityShanghai200444China Zhejiang Institute of Advanced Materials Shanghai UniversityJiaxing314113China Jiangsu shagang Iron and Steel Research Institute Zhangjiagang215625China Jiangsu Shasteel group Co. LtdZhangjiagang215625China

A new type of steel containing Sb based on the CASTRIP process had been designed to improve the corrosion resistance of high-strength steels in industrial *** properties of the electrochemistry and rust layer(RL)were analyzed to evaluate the corrosion resistance of the ultra-thin cast strip(UCS)steel containing 0.10%*** results showed that the corrosion resistance of UCS steel containing Sb was doubled compared to that of traditional hot rolling strip(HRS)*** could be interpreted as an integral effect of CASTRIP process and alloying *** optimization for microstructure and inclusion of UCS steel can reduce the localized corrosion effects in initial corrosion ***,P and Sb reduced the anodic reaction and CuFeO2/Cu2O,CuO,FePO4 and Sb2O3 were formed,promoting the transition fromγ-FeOOH toα-FeOOH.A(Cu,Sb,P)-enriched inner RL was generated and significantly improved protective ability of the RL.

关键词： Ultra-thin cast strip(UCS) Sb Corrosion resistance Rust layer

Effect of Nb Solute and NbC Precipitates on Dynamic or Static Recrystallization in Nb Steels

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Journal of Iron and Steel Research International 2012年第11期19卷 52-56页

作者： XIAO Fu-ren CAO Ya-bin QIAO Gui-ying ZHANG Xiao-bing LIAO Bo Key Laboratory of Metastable Materials Science and Technology College of Materials Science and EngineeringYanshan UniversityQinhuangdao 066004HebeiChina School of Environmental and Chemical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina Jiangsu shagang group Co Ltd Zhangjiagang215625JiangsuChina

Nb is often considered to be a powerful alloying element for controlling the recrystaUization process in mi- croalloyed high strength steels. However, Nb can be presented either as solute in solution, where it is thought to ex- hibit a strong solute drag effect, or as NbC precipitates, which are thought to be effective at pinning grain bounda- ries. Therefore, it is very important to quantitatively measure Nb in solution or in NbC precipitates. A quantitative analysis method of Nb in solution and in precipitates was proposed. The test procedure involved chemical dissolution, filtration and inductively coupled plasma atomic emission spectroscopic （ICP-AES） analysis. The amount of Nb in solution in Nb-microallyed steels under different treatment conditions was evaluated. The results show that the niobium and carbon contents in steels have a great effect on niobium dissolution kinetics. The solute Nb is more effective to retard dynamic recrystallization, while the NbC precipitates are more effective to inhibit static recrystaltization. The results may help to comprehend effect of Nb in steels, and provide some guides in the design of new high strength Nb-bearing steels.

关键词： Nh microalloyed steel solution precipitation quantitative analysis recrystallization

In situ observation and modeling of austenite grain growth in a Nb-Ti-bearing high carbon steel

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Journal of Iron and Steel Research International 2019年第3期26卷 292-300页

作者： Guang Ji Xiu-hua Gao Zhen-guang Liu Ke Zhang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Jiangsu shagang group Huaigang Special Steel Co. Ltd.Huaian 223002JiangsuChina School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina Institute of Research of Iron and Steel ShasteelZhangjiagang 215625JiangsuChina

In situ measurements of austenite grain growth were made at various temperatures in the range of 1273-1473 K with subsequent isothermal holding time of 3600 s for the Nb-Ti-bearing and Nb-Ti-free high carb on steel by using a confocal laser scanning *** solid solute behavior of Nb-Ti carbides during austenitizing process was *** experimental results indicate that the austenite grains of both steels grow up gradually with increasing the heating temperature and holding time;the size and growth rate of austenite grain of Nb-Ti-bearing high carbon steel are much lower than those of Nb-Ti-free high carbon steel.A large amount of(Nb,Ti)(C,N)nanoparticles are observed in Nb-Tibearing steel,which retain the strong pinning effect on austenite grain *** kinetics model of austenite grain growth of Nb-Ti-bearing steel during isothermal heat treatment is obtained and the predicted values calculated by using the model meet the experimental values very well.

关键词： Con focal laser scanning microscope Nb-Ti microalloying High carb on steel Grain growth Nanoparticle Grain growth model

Correction to:A Study of Rust Layer of Ultra‑Thin Cast Strip Steel Containing 0.10%Sb in Simulated Industrial Atmosphere

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Acta Metallurgica Sinica(English Letters) 2023年第12期36卷 2100-2100页

作者： Long Chen Xintong Lian Zhong Xi Tengshi Liu Qingxiao Feng Hualong Li Yixin Shi Han Dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Zhejiang Institute of Advanced Materials Shanghai UniversityJiaxing 314113China Jiangsu shagang Iron and Steel Research Institute Zhangjiagang 215625China Jiangsu Shasteel group Co. LtdZhangjiagang 215625China

Metallurgical Design, Development and Strengthening Mechanisms for HRB600E Reinforcing Bar

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Journal of Mechanics Engineering and Automation 2021年第1期11卷 1-10页

作者： Zhang Yongqing Wang Maoqiu Yong Qilong Nie Wenjin Jose MRodriguez-Ibabe Marcelo Rebellato China Iron&Steel Research Institute group No.76 Xueyuan NanluHaidianBeijing 100081China CITIC Metal Co. LtdRoom 1901 Capital MansionBeijing 100004China shagang Steel&Iron Trade Co. LtdZhangjiagang Bonded AreaJiangsu 215625China Ceit Research Institute P.M.Lardizabal 15 Donostia San Sebastian 20018Spain Eurosport—RMS Sao Paulo SPBrazil

High-strength,anti-seismic requirements represent the development tendency to hot-rolled ribbed bar used for the reinforcement of *** this paper,metallurgical design,development and strengthening mechanisms for 600 MPa reinforcing bar with anti-seismic requirements have been studied and presented based on the production practice of 335 MPa,400 MPa and 500 MPa *** trial and error,it was found that alloy design with niobium plus vanadium is the best way to achieve the optimum combination of yield strength and anti-seismic properties,especially,small amount niobium addition can improve upon tensile-to-yield *** order to clarify the underlying theoretical principles for the strengthening effects,qualitative and quantitative analysis for microstructure had been conducted with the aid of optical microscopy,scanning electron microscopy,transmission electron microscopy and chemical extraction technique,together with the solution and precipitation behavior of niobium and vanadium during the hot-rolling and cooling *** on analysis results,it was found strengthening effects of both niobium and vanadium demonstrate some additional strengthening effects apart from predominated precipitation strengthening and grain refinement strengthening *** adding high vanadium contents is indispensable to achieve needed yield strength through precipitation strengthening effects,but fine VN particles precipitated in relatively high temperature also bring grain refinement effects for austenite and ***,grain refinement is not overall to describe the effects of niobium in long products,small amount of niobium contents is marked to improve upon tensile-to-yield ratio due to transformation strengthening resulted from the niobium contents in *** the development of HRB600E,strengthening mechanisms of vanadium and niobium in medium carbon long products had been enriched.

关键词： HRB600E anti-seismic tensile-to-yield ratio transformation strengthening