共查询到19条相似文献,搜索用时 156 毫秒
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徐天兵 《金属材料与冶金工程》2004,32(3):6-8
研究了热处理对新型热轧调质无缝油管用25CrMnMo钢性能的影响。结果表明:该钢在920℃保温30min水冷,650℃回火70min后有较好的强度和韧性。通过选择不同的调质工艺可以满足API 5CT标准中N80Q和P110等高钢级油管的性能要求。 相似文献
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减小(高强度、大口径)石油套管接箍加工变形 总被引:1,自引:0,他引:1
简介了高强度、大口径石油套管接箍机械加工工艺,以及测量接箍变形的方法;讨论了从材料热处理工艺带来的残余应力、外径壁厚偏差、切削用量、工件的装夹方式、机械物理性能、化学成分等对接箍加工变形的影响。试验研究结果表明,攀钢集团成都钢铁有限责任公司的φ39.7 P110BC石油套管接箍的加工生产,通过不断改进工艺,已有效地减小接箍加工变形。 相似文献
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针对接箍料管在热处理过程中出现的性能批量不合格现象,分析其主要原因是淬透程度不一,有可能是材料成分、钢管壁厚、工艺参数的波动引起。通过有针对性的小批量试验,对三条热处理线的接箍料管生产工艺进行了全面优化。 相似文献
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采用25Mn2V钢、BOF→LF+VD→连铸→轧制→调质处理工艺,通过设计优化钢的化学成分及热处理工艺等,控制C含量在0.23%~0.26%,热轧使用高质量石墨润滑剂、Φ180mm圆管坯,开发生产了Φ177.8mm×10.36mm规格P110钢级套管,产品屈服强度903.8MPa,性能合格率100%,超声波探伤L2合格,几何尺寸、外表质量良好,产品质量满足API5CT规范及用户要求。 相似文献
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研究了不同热处理工艺后40Cr10Si2Mo气阀钢力学性能、调质硬度,以及在要求技术条件下的力学性能、调质硬度、金相组织与不同热处理温度之间的关系,找到了满足技术条件要求最佳的热处理工艺制度。 相似文献
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The change rule of mechanical properties and impact fracture morphologies of a high Co- Ni secondary hardening ultra- high strength 25Co15Ni11Cr2MoE steel tempered at 200-750?? after quenched was studied by mechanical properties test and microstructure analysis such as optical microscope(OM) and scanning electron microscope(SEM). The results show that experimental steel after quenching and tempering has a remarkable secondary hardening effect. After tempered at 400-495??, the hardness of experimental steel can reach and beyond the quenched hardness. In this range, tensile strength, yield strength and hardness of experimental steel increase with the tempering temperature increasing, tensile strength and hardness of experimental reach maximum (57. 3HRC and 2160MPa) after tempered at 470??, meanwhile, with the tempering temperature increasing, impact toughness of experimental steel decreases during the prophase, until reaches minimum at 430??, then increases gradually, and reaches maximum after tempered at 510??. The recommended optimum heat treatment process of 25Co15Ni11Cr2MoE steel is as follow: 950???1h oil quenching??(-73??)??1h rising back to room temperature in the air ??495???5h air cooling. At this time, the experimental steel has the best strength and toughness matching. 相似文献
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Use of the nanoindentation technique for studying microstructure/crack interactions in the fatigue of 4340 steel 总被引:2,自引:0,他引:2
Fan Yang Ashok Saxena Laura Riester 《Metallurgical and Materials Transactions A》1998,29(12):3029-3036
The objectives of this research are to study the influence of microstructure on the fatigue crack growth behavior in 4340
steel and to explore the application of the nanoindentation technique for determining the plastic deformation zone at a fatigue
crack tip. Two heat treatment conditions were chosen for the steel: annealed and quenched plus tempered. The annealed steel
consists of coarse pearlite and proeutectoid ferrite, while the quenched and tempered steel consists of fine tempered martensite.
Fatigue crack propagation tests were conducted on disklike compact (DCT) specimens. Subsequently, the nanoindentation technique
was applied to quantitatively determine the plastic deformation zone at fatigue crack tips. The plastic deformation zone size
determined by the nanoindentation test seems larger than the cyclic deformation zone calculated using the fracture mechanics
equation, which involves many assumptions. The fatigue crack growth test results show that the annealed steel has a higher
resistance to crack growth than the quenched and tempered steel. The fatigue crack in the annealed steel tends to grow along
pearlite domain boundaries, or the cementite/ferrite interfaces within a pearlite domain. In contrast, the fatigue crack in
the quenched and tempered steel tends to traverse the fine martensite laths. Consequently, the actual crack path in the annealed
steel is rougher than in the quenched and tempered steel and more secondary cracks are observed in the annealed steel. 相似文献
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叙述了国内外常用冷挤压成型工艺的转向横拉杆用钢的应用现状及加工工艺,介绍了横拉杆用普通调质钢、预调质钢及非调质冷镦钢产品的主要技术指标和对应生产的零件性能。生产实践表明,相比普通调质钢MI40Cr和预调质钢ESW90,非调质冷镦钢30MnVS6生产的汽车转向横拉杆强度和塑性可达同等水平,但冲击韧性明显偏低;从化学成分、显微组织、非金属夹杂物及偏析四方面探讨了提升非调质冷镦钢强韧性的研究进展情况,通过正火处理30MnVS6钢的KV2冲击功由热轧态62~67 J提高至108~115 J。 相似文献
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微合金元化元素的应用范围越来越广泛.如今已成为控轧钢必不可缺的元素.而且,也越来越多地应用到了调质钢的生产。尤其是硼、钛、铌元素在调质钢中的加入.不但能提高调质钢的淬透性.而且有利于焊接甚至大线能量焊接性能,为调质高强钢在大型工程项目中的应用起到了关键作用。 相似文献
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本试验研究了不同淬火和回火工艺热处理对Cr12MoV钢组织、硬度和磨损性能的影响。实验结果表明:当在1050~1100℃范围内淬火、520℃回火时,得隐针马氏体+少量残余奥氏体组织,材料硬度与耐磨性均较好;当在1100℃淬火,各温度二次回火硬度均较一次回火高,当在550℃回火时,试验钢实现二次硬化,且残余奥氏体大量转变,硬度和耐磨性达最大值,材料性能最优。 相似文献
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新型调质高强钢WH80Q的研制开发 总被引:1,自引:0,他引:1
舞钢研制开发的调质钢WH80Q具有高强度、良好的低温冲击韧性、抗层状撕裂性能、较低的时效敏感性系数。该钢采用低碳低合金的化学成分设计,运用控制轧制和控制冷却技术,使WH80Q具有比传统调质钢更低的碳当量和焊接裂纹敏感性系数。 相似文献