In this paper, the traditional HAZ grain growth model is analyzed. Based on the model, analytical model of austenite grain growth fit to high strength pipe-steel is introduced.
分析了传统的焊接热影响区（HAZ）晶粒长大模型，在此基础上，介绍了适用于高强度管线钢的奥氏体晶粒长大的耦合模型。
The results show that mechanical properties of the pipe were improved greatly by new technique, and grain size refined, microstructure improved, residual stress and energy consumption reduced.
结果表明，新工艺可明显提高产品的力学性能、细化晶粒、改善组织、减小应力，并降低了能耗。
The forces of the main fixed support in water pipe system and items of selection of metal wave grain tube were introduced.
分析了管路系统主固定支架的受力情况，指出了波纹管膨胀节选型的注意事项。
The RH in aeration pipe increased and the moisture was pressed into the grain bulk through the aeration pipe. The moisture was absorbed by grains and equilibriumed.
采用机械加压通风增湿调节供风管道内的相对湿度，将水汽压入粮堆使谷粒自然吸湿并平衡水分。
The article discusses and finds the Auster grain growing rules and relations of structure and properties of X70 steel in weld pipe and pipe accessories under the different heating temperature.
研究了一种适用于管道钢管和管件制造的X70级管线钢在不同加热温度下的奥氏体晶粒长大规律和组织-性能间的关系。
A vibrating bottom mechanism was developed to overcome the piled grain on the bottom of the air suction pipe.
为解决气吸式割前摘脱装置的气流吸运管路底板上偶尔产生物料积存的问题，设计了一种底板振动装置。
The main reason for cracking is liquid copper diffused into the austenite grain boundary and grain boundary embrittlement was caused, so the welded pipe cracked under stress.
开裂主要原因为液相铜扩散进入奥氏体晶界引起晶界脆化，在应力作用下引起焊管开裂。
The main reason for cracking is liquid copper diffused into the austenite grain boundary and grain boundary embrittlement was caused, so the welded pipe cracked under stress.
开裂主要原因为液相铜扩散进入奥氏体晶界引起晶界脆化，在应力作用下引起焊管开裂。
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