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文章介绍了布氏硬度试验中测量结果的不确定度评定方法。按标准硬度块示值误差、布氏硬度计、测量示值误差等不同因素,对不同范围的布氏硬度值进行不确定度评定。此次给出的布氏硬度试验测量结果的不确定度评定适用于本部门的布氏硬度试验。 相似文献
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李维钺 《冶金标准化与质量》1997,(6)
1前言工业生产中,金属材料或机械零件要求的布氏硬度值确定之后,用测量所得的布氏硬度值,即可判定材料是否满足技术要求。金属布氏硬度试验方法已有多年历史,随着国家标准和行业标准的制修订以及国际间的交流,现就被测试件如何才能得到较准确的布氏硬度值的一些问题进行探讨。2与布氏硬度值有关的一些技术要求仅列出布氏硬度值,其余力学性能指标略。2.l材料标准见表1。2.Zat艺标准见表2。2.3技术指标对比与分析1)45优质碳素结构同为冶金行业制修订的技术标准,但布氏硬度值要求不同。国际(GB)为<197HBS,行业标准(YB/T)… 相似文献
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用直径为10mm的45钢拉伸试样,在万能材料试验机上进行拉伸试验,对拉伸试验性能指标屈服强度、抗拉强度、断后伸长率、断面收缩率的测量不确定度进行分析并做出具体评定。 相似文献
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采用电位滴定仪测定锰铁中锰含量,应用统计学理论对其分析结果不确定度的产生原因进行分析,建立测量过程分量的数学模型,分析测量过程不确定度来源及各不确定度分量对总不确定度的影响.确定测定结果的置信区间。给出锰铁中锰的含量及其置信区间为80.45%±0.38%。 相似文献
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本文简要介绍了不确定度的基本概念及评定方法,对封头用不锈钢OCr18Ni9的布氏硬度不确定度进行了分析并作出一般评定。 相似文献
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正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province 相似文献
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正In the face of the current situation of the lost WTO dispute on rare earth,and cancellation of export tariff for partial rare earth products,efforts of regulation and integration on rare earth by the state government will again be tightened.Reporters of the Economic Information Daily recently learned from authoritative sources that relevant ministries are 相似文献
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正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where 相似文献
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《Baosteel Technical Research》2014,8(4)
正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in 相似文献