Results 31 to 40 of about 1,631 (150)
Zhejiang Daxue xuebao. Lixue ban, 2019 利用在线监测仪测量了杭州市一次重灰霾过程（2017年12月29日至2018年1月3日） 中PM2.5主要水溶性离子（Cl- 、SO42- 、NO3- 、NH4+ 、Na+ 、Ga2+ 、Mg2+） 及主要气态污染物（SO2、NO2、O3、NO、CO、 HCl、NH3、HNO2、HNO3） 的小时浓度。结合混合受体模型和国控监测分析，研究了2017 年12 月30-31 日重灰霾事件的污染特征、来源和成因。研究结果表明：PM2.5 浓度高达318 μg·m-3； NO3-/SO42-最大值为2.68 ...
WANGPeng(汪鹏) +8 more
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High Temperature Mechanical Properties and Fracture Mechanism of 9Cr-2W-3Co Martensitic Heat-resistant Steel [PDF]
The microstructure of normalized & tempered 9Cr-2W-3Co martensitic heat-resistant steel and its tensile strength and fracture mechanism at different strain rates （5×100， 5×10-1， 5×10-2， 5×10-3， 5×10-4 s-1） at 625 ℃ was researched.
Geng Wei, Zhu Zhibao, Ma Jinhui, Song Xinli
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Dianci bileiqi, 1985 空气断路器瓷套（以下简称瓷套）是高压电瓷的重要元件之一。本文的目的是介绍用超声波无损检测瓷套最常见的几种内部缺陷,如:开口微气孔、夹层、杂质,宏观气孔（由于内部有秽物）等。瓷套质量检测系统原先规定对全部制品进行水压试验和目测;对没有外部气孔的制品及其热稳定性与电气性能进行抽测（ГОСТ 5862—79）。在ГОСТ中没有规定瓷套的超声波无损检测。经过多年来的实践证明 ...
M·A·克拉莎维娜, 刘凤岐
doaj
Effect of BOF-RH-CC and BOF-LF-CC Process on Cleanness of Cold Heading Steel ML08Al
Teshugang, 2022 The types and quantity density of non-metallic inclusions, and the change of total oxygen in steel ML08Al produced by the two processes BOF-RH-CC and BOF-LF-CC are analyzed.
屠兴圹 +4 more
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Effect of RE on Inclusions and Mechanical Properties of Steel 42CrMoTiB
Teshugang, 2013 The test steel 42CrMoTiB and RE microalloying steels 42CrMoTiBRE (/% : 0.41 -0.43C, 0. 36 ~0. 38Si, 0.59~0.72Mn, 0.018 ~ 0.020P, 0.005 ~0.010S, 1.08-1. 13Cr, 0. 16~0. 19Mo, 0. 06 ~ 0.08Ti, 0. 003 ~ 0.004B, 0~ 0.
斯庭智
doaj
Hot ductility and fracture mechanism of a Ti-bearing microalloyed steel [PDF]
, 2016 The hot ductility of a Ti-bearing microalloyed steel was studied at temperatures of 600 to 1350 ℃ by a thermal simulator Gleeble 1500.The fracture morphology and microstructure were observed by scanning electron microscopy and optical microscopy.The ...
LI Ming +4 more
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Hot ductility and fracture mechanism of Fe-22Mn-0.7C TWIP steel [PDF]
, 2016 The static tensile behaviors of Fe-22Mn-0.7C TWIP steel and Q235 steel between 700 ℃ and 1300 ℃ were investigated by Gleeble-1500 thermo-mechanical simulator.The microstructure characteristic and fracture morphology were observed by optical microscopy ...
DU Chen-wei +4 more
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Teshugang, 2010 The effect of five different bottom gas blowing scheme on flow characteristics of liquid steel and inclusions removing from steel in tundish has been studied by using 1: 3 water model-testing for a 40 t tundish to measure the flow field of liquid in ...
李晓柄 +4 more
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Control of T[O] and Inclusion in Casing Pipe Steel for Petroleum during LF Refining
Teshugang, 2009 The improved process to decrease T[O] and inclusion content in steel was proposed by analysis on relation between T[O] and stable oxide inclusion content in liquid casing pipe steel 37Mn5 at 1 540 ~ 1 580 ℃ during 100 t LF refining and effect of slag ...
姚同路, 林平, 佟溥翘
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Effect of RH Non-adding Ca Treatment on D and Ds Inclusion of SCM435 Cold Heading Steel
Teshugang, 2020 The production flow sheet of SCM435 steel is 80 t BOF-LF-RH-280 mm x 325 mm bloom casting. LF end refining slag composition is (/% ：) 45 〜55 CaO, 10 〜15SiO220 〜30 Al2O3∑(FeO + MnO) ≤ 1 % .
李永超, 吕皓杰, 李龙
doaj