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套管抗挤强度的主要影响因素有平均壁厚、几何尺寸精度、屈服强度、残余应力等儿方面。提高管体几何尺寸精度尤其是壁厚不均度、以及采取合理热矫直工艺,可以使套管的抗挤强度超过API要求的70%以上。 相似文献
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文章通过研究合金元素在钢中的作用,基于原钢种30MnCr22生产的调质L80-1钢级套管的性能特点,研发了新钢种30MnCr25RE用以生产L80-1钢级石油套管。产业化抽检结果表明,采用新钢种30MnCr25RE生产的L80-1钢级套管,最小屈服强度为570 MPa,最大屈服强度为625 MPa,屈服强度波动范围控制在55 MPa以内,相比较30MnCr22原钢种,开发的新钢种屈服强度波动范围更窄,性能更加稳定。相较于原钢种30MnCr22生产的调质L80-1钢级套管,延伸率提高了4个百分点左右,0℃冲击功不仅满足API spec 5CT技术规范要求,同时满足用户严苛的技术要求。 相似文献
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化学成分和正火工艺对J55钢套管屈服强度的影响王素志,傅继成(天津钢管公司钢研所,天津300301)EffectofChemicalCompositionandNormalizingProcedureonYieldStrengthofSteelfor... 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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石油套管断裂韧性的分析 总被引:1,自引:0,他引:1
对J积分用于套管的断裂韧性测试进行了研究,计算在载荷达到最大值时套管材料的J积分值,并与冲击韧性Ak进行比较,讨论了用断裂韧性作为井下射孔性能判据的必要性和可行性。 相似文献
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模拟点蚀油气管线钢的拉伸性能 总被引:3,自引:0,他引:3
根据发生点腐蚀的油气管线基体有许多点蚀坑的特点,通过计算机产生随机数确定点蚀坑的位置,用小钻头打孔的方法模拟X60管线钢基体的多孔特征进行拉伸试验,测得其弹性模量、屈服强度和抗拉强度,并将理论计算值与前二者进行比较和修正,给出了多孔钢材的抗拉强度与孔隙率的函数关系.结果表明,多孔钢材弹性模量的实测值随孔隙率的变化与理论预测结果较为吻合;钢材实测屈服强度也随着孔隙率的增加而减少,但在较高孔隙率时其减少趋势变缓;衰减速率的实测值略大于理论预测值;实测抗拉强度随孔隙率的变化曲线与屈服强度相似,但对孔隙率更敏感. 相似文献
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Experiments were performed to identify the strengthening mechanism responsible for the increase in the 0.01 pct offset yield
strength upon heat treatment of heavily cold rolled phosphor bronze, CDA 510. The effects of alloy chemistry, crystallographic
texture, and microstructure upon this heat treatment response were examined with tensile testing, differential thermal analysis
and transmission electron microscopy. No evidence for precipitation was observed over the range of thermal treatments for
which enhancement of the 0.01 pct offset yield strength is exhibited. This strength enhancement can be explained by a reduction
of the mobile dislocation density by rearrangement into stable arrays and/or dislocation pinning by tin atoms. 相似文献
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采用粉末冶金法制备出成分为Fe-12.5Cr-2.5W-0.4Ti-0.02V-0.4Y2O3(12Cr-ODS,质量分数,%)的铁素体钢.通过电镜观察及力学性能测试等手段研究了12Cr-ODS铁素体钢的组织与性能,并定量计算了不同强化机制对合金屈服强度的贡献.电镜观察发现12Cr-ODS钢为等轴的铁素体组织,平均晶粒尺寸为1.5μm,不同尺寸氧化物在基体中均匀分布.力学性能测试结果表明12Cr-ODS钢具有优异的室温拉伸性能,屈服强度达到738 MPa.合金主要强化机制为氧化物弥散强化、氧化物弥散强化钢加工强化、热错配位错强化和晶界强化机制,各种强化机制计算得到的理论屈服强度为750 MPa,与实测值吻合较好. 相似文献
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Tensile, impact and fatigue strength of high-purity 0 % and 2 % cobalt steels of eutectoid compositions have been determined using standard testing methods. The addition of cobalt has caused an increase in tensile and yield strength and a decrease in impact and fatigue strengths. 相似文献
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为研究600 MPa级高强钢筋高温下的力学性能,对HTRB600级热处理高强钢筋进行高温下的拉伸试验,分别测得其在20,200,300,400,500,600,700及800℃高温下的弹性模量、比例极限、屈服强度、极限强度及应力-应变曲线.试验结果表明:HTRB600级高强钢筋高温下屈服强度、极限强度、比例极限与弹性模量均随着温度的升高而显著降低.500℃时其高温下的弹性模量、比例极限、屈服强度与极限强度降低为不足常温下的50%,800℃时已不足常温下的10%.高温下HTRB600级高强钢筋应力-应变曲线随温度的升高逐渐趋于圆滑,当温度达到200℃时,屈服台阶就已消失.600 MPa级钢筋高温下屈服强度和极限强度的降低程度明显大于其他钢筋500 MPa以下强度的钢筋.最后提出了适用于HTRB600级高强钢筋的高温下应力-应变曲线简化计算模型. 相似文献
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Tensile, impact and fatigue strengths of 0%, 2% and 4% silicon steels of eutectoid compositions have been determined using standard testing methods. Tensile and impact strengths tests show an increase in brittleness (loss in elongation) and an increase in yield point, tensile strength and fatigue strength due to Si additions. 相似文献
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Metallurgist - Experimental rolling of copper strips (M0) on a 150×235 mill was carried out followed by testing of the material to determine the yield strength (deformation resistance),... 相似文献
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Mechanical properties of cold-worked molybdenum, grade 4 titanium, and an α-β titanium alloy are measured with tensile tests
and by indentations using conical indenters with 105, 120, and 137 deg included angles. The extent of plastic deformation
and pileup around an indentation is measured using profilometry. Various models predicting the extent of plastic deformation
and pileup are compared to the actual measured values. As inferred from indentation, the calculated yield strength of the
material from the mean pressure does not correlate well to the yield strength measured by tensile testing. The plastic zone
size surrounding an indentation can also be used to determine the yield strength of the material, and this does correlate
to the yield strength measured by tensile tests. Furthermore, the extent of plastic deformation is relatively independent
of the included angle of the indenter for the range of materials used in this system. Models predicting the amount of pileup
at the edges of the indentation appear to approach but overestimate the actual amount of pileup in the materials tested. 相似文献