SA106C毛管等温正火组织和力学性能分析.pdf

验与研究
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SA106C毛管等温正火组织和力学性能分析
曹铜壁,张建民,李文亮,吴志杰
(河北宏润重丁股份有限公司,河北盐山061300)
摘要:在SA106C毛管常规正火处理工艺的基础上,介绍了等温正火处理工艺,并对比分析了SA106C毛
管经常规正火及等温正火处理后的金相组织与力学性能。分析认为:与常规正火处理相比,SA106C毛管经等温
正火处理后,其晶粒更加细化,晶粒度提高2级,屈服强度和抗拉强度约提高30MPa,冲击韧性略有提高,材料
综合力学性能较好。
关键词:SA106C毛管;等温正火;常规正火;先共析铁素体;组织不均;晶粒细化;力学性能
中图分类号:TG162.84文献标志码:B文章编号:1001-2311(2013)01-0021-04
Analysis of Structure and Mechanical Properties of SA106C
Steel Tube Treated with Isothermal Normalization Process
O Tongbi, ZHANG Jianmin, L Wenliang, WU Zhijie
Hebei Hongrun Heavy Industrial Co, Ltd, Yanshan 061300, China
Abstract: Based on the convenient normalization heat treatment process for the SA106C steel tube, the
sothermal normalization process is presented. And a comparative analysis is made to the metallographic structure and
the mechanical properties of the SA106C tube as treated with the convenient normalization process and to those of the
ne tube as treated with the isothermal normalization process. The analysis result shows that compared with the con
ient normalization process, the isothermal normalization process makes the tube much better in terms of structure
and property, i.e, the grain structure is finer with grain size enhanced by 2. both the yield strength and tensile
strength are increased by about 30 MPA, the impact toughness is also a little bit increased, and the comprehensive
mechanical properties of the material are good
Key words: SA106C steel tube; isothermal normalization; convenient normalization; pro-eutectic ferrite
structural inhomogeneity; grain fining; mechanical property
河北宏润重工股份有限公司(简称宏润重工)采
在实际生产中,冲孔一拔伸过程中每次变形不
用多次加热冲孔一拔伸的锻造工艺生产SA106C高均,金相组织不均匀,成分存在局部严重偏析,大
温用无缝钢管,其锻造毛管一般都应进行正火处块状铁素体和珠光体尺寸配合相差较大,且珠光
理,目的是为了细化晶粒,减轻成分偏析,消除组体分布不均匀。
织残余应力等,从而提高材料的综合力学性能。但
研究5表明:采用等温正火处理工艺,可较
是,常规正火处理的冷却速度在实际生产中不能稳大程度地提高珠光体析出量,且分布均匀,消除
定控制,使得SA106C毛管的力学性能不能达到组织不均匀性,在一定程度上控制铁素体的析出速
ASME SA106/SA106M2010《高温用无缝碳钢公度,使得最终组织中铁素体和珠光体之间达到较佳
称管》标准要求。
的配合
本文主要对SA106C毛管经常规正火和等温正
曹铜壁(1982-),男,硕士,助理工程师,主要从事
火处理后的显微组织与力学性能进行分析,以期得
无缝钢管挤压加工及热处理的工艺研究。
到满足标准要求的产品。
STEEL PIPE Feb 2013, Vol 42, No. 1
钢管2013年2月第42卷第1期