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Metallurgical Optimization of microalloyed Steels for Oil and Gas Transmission Pipelines

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Journal of Iron and Steel Research International 2011年第S1期18卷 669-674页

作者： Stalheim Douglas DGS Metallurgical Solutions Inc. 15003 NE 10th StreetVancouverWA98684 USA

The production of microalloyed steels for oil and gas transmission pipelines has increased significantly over the past *** more and more countries developing their own capabilities to produce pipeline steels to support their own internal pipeline infrastructure development,there has been an increase of steel producers working to develop their own capabilities to produce microalloyed steels for this ***,to achieve the desired mechanical property attributes for transmission pipeline applications utilizing a cost effective approach requires metallurgical optimization of the microalloyed *** achieve metallurgical optimization a basic understanding is required in the design of a cost effective alloy and then the proper processing of that alloy design to achieve the optimum microstructure/mechanical *** this sense,many producers in the world,especially those who have only recently,in the past 10 years,developed their capability to produce microalloyed transmission pipeline steels still do not achieve metallurgical optimization of their alloy and *** results in yield losses due to failures,inefficient processing causing productivity losses and additional expensive additions of alloys to compensate for failures and process *** the supplier of plate/coil has the largest percentage effect on the final cost of the pipe,the steel producer must understand proper alloy,microstructure,and process design to produce a uniform and stable plate/coil to be used in pipe *** means that strength,toughness and microstructure must be uniform down the length,across the width and through the cross *** optimization is achieved when this uniformity is achieved with a cost effective *** to that,non-uniformity results in pipe forming,welding,expansion,mechanical property and production issues resulting in downgraded pipe and cost overruns in *** paper will describe targets for p

关键词： microalloy niobium pipeline solubility grain size rolling schedule

Microstructure and mechanical properties of an Nb-microalloyed EH47 steel

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Baosteel Technical Research 2023年第2期17卷 15-28页

作者： LU Xiaohui GAO Shan ZHANG Caiyi Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

The loading capacity of ultralarge container ships has reached 24000 TEUs so far,and to ensure the safe operation of these ships,the maxmium thickness of crack arrest steel used in the upper deck areas reaches 100 mm,and crack arrest toughness(K_(ca))needs to be>8000 N/mm^(3)/*** EH47 steel was employed to study the effect of Nb on the phase transformation of supercooled austenite in the continuous cooling process after rolling and the effect of Nb on microstructure and mechanical properties of the crack arrest steel *** was found that the addition of 0.02%Nb can inhibit the ferrite transformation,improve the steel plate strength,and reduce the strength inhomogeneity in the thickness *** production of 100 mm-thick EH47 was carried out based on the function of Nb in EH47 steel,and the test results reveal that high-strength EH47 shipbuilding plates with high toughness,excellent fracture and crack arrest toughness,and good welding properties can be produced using Nb-microalloyed composition design and the thermal mechanical control process(TMCP);furthermore,the value of the crack arrest toughness reached 9450.7 N/mm^(3/2) at-10℃.

关键词： EH47 crack arrest steel microalloy crack arrest toughness

Effects of Niobium and Vanadium on Hydrogen-Induced Delayed Fracture in High Strength Spring Steel

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Journal of Iron and Steel Research International 2011年第6期18卷 49-53页

作者： ZHANG Chao-lei LIU Ya-zheng JIANG Chao XIAO Jin fu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Influence of vanadium and/or niobium additions on delayed fracture behavior in high strength spring steel was studied by hydrogen permeation method and slow strain rate technique （8SRT）, and its mechanism was analyzed. The results show that apparent diffusion coefficient of hydrogen in microalloyed spring steels Nb-V-steel and Nb-steel is lower than that in non-microalloyed steel 60Si2MnA. Percentage of strength reduction in SSRT in air after precharged hydrogen of the microalloyed steels is smaller than that of 60Si2MnA. Addition of the microalloys changes the fracture characteristics. Thence, vanadium and/or niobium additions are a very effective and economy means to improve the hydrogen-induced delayed fracture resistance of high strength spring steel.

关键词： spring steel microalloy hydrogen-induced delayed fracture slow strain rate technique hydrogen permeation

Effect of vanadium on the microstructure and properties of metastable austenitic stainless steel AISI 301LN

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Baosteel Technical Research 2021年第2期15卷 42-47页

作者： HUANG Junxia GU Jiaqing Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

In this study,the effect of vanadium on the microstructure and properties of the metastable austenitic stainless steel AISI 301LN was *** of the study show that the addition of vanadium can refine grains and increase the strength of AISI 301LN by solution *** 60%cold-rolling reduction,the microstructure of the steel was composed of work-hardened austenite bands and deformation-inducedɑ′*** work-hardening and phase transformation strengthening *** cold rolling and subsequent annealing,the deformation-inducedɑ′martensite was reversed into fine-grained *** work-hardened austenite bands underwent recrystallization;however,the structure of the recrystallized austenite grains was coarser than that of the reversed ***,the strength of the experimental steels decreased with the increase in annealing *** pinning effect of precipitates of vanadium inhibited the growth of austenite ***,the desirable combination of strength and ductility was obtained by grain refinement.

关键词： microalloy grain refinement strength austenite stainless steel

Influence of Boron Additions on Mechanical Properties of Carbon Steel

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Journal of Minerals and Materials Characterization and Engineering 2012年第10期11卷 995-999页

作者： Saeed N. Ghali Hoda S. El-Faramawy Mamdouh M. Eissa Steel Technology Department Central Metallurgical Research & Development Institute (CMRDI) Helwan Cairo Egypt

This work aims at the development of carbon steel AISI 1536 through the microalloying addition of boron. Three grades of this steel with different content of boron up to 0.0055% were melted in 100 kg induction furnace. The pro- duced steels were hardened at 960°C for 30 min., followed by tempering at different temperatures and durations. All hardened steels have martensite phase as illustrated with microstructures and X-ray diffraction. Hardness of all tem- pered steel samples was measured to calculate the activation energies of carbon migration through martensite phase. The results indicated that the activation energies of carbon migration through martensite phase decreases with the in- crease of boron content due to its positive effect on the crystallinity of martensite phase. Also, the results showed that the addition of boron up to 0.0023% can improve the steel properties at the lowest temperature and tempered time.

关键词： Boron Steel microalloy Activation Energy Carbon Migration Martensite