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首页> 外文期刊>ISIJ international >Thermomechanical Processing Of Pipeline Steels With A Reduced Mn Content
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Thermomechanical Processing Of Pipeline Steels With A Reduced Mn Content

机译：锰含量降低的管线钢的热机械加工

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摘要

Lowering the Mn content of hot rolled pipeline steel can economise the steel making process by eliminating costly desulphurisation and at the same time improve product properties, particularly toughness, by reducing the formation of MnS inclusions. Lower Mn contents, however, have significant implications for austenite recrystallization and austenite (γ) to ferrite (α) transformation behaviour. This study compares the recrystallization start (7_nr) and y to a transformation (A_r3) temperatures of two low Mn steels to those of a commercial steel with a conventional Mn content. Simulations of thermomechanical processing were carried out using a Gleeble 3500 testing machine. The 7_nr for the low Mn alloy design were found to be~25℃ higher than for the high Mn steel, while the A_r3 of the low Mn steel were some 50℃ higher. The higher A_r3 promotes the formation of coarse ferrite grains, thus reducing the strengthening and toughening benefits of a fine grain size. However, this could largely be overcome by maximising the degree of deformation performed between T_nr and A_r3 and maintaining a combination of high cooling rates and low stop cooling temperatures below A_r3, thus providing a high density of nucleation sites and promoting high nucleation rates. Production trials validated the results from the Gleeble tests.
机译：降低热轧管线钢的Mn含量可以消除昂贵的脱硫，并通过减少MnS夹杂物的形成来提高产品性能，特别是韧性，从而节省炼钢过程。但是，较低的Mn含量对奥氏体再结晶和奥氏体（γ）转变为铁素体（α）的行为具有重要意义。这项研究将两种低锰钢的再结晶起始温度（7_nr）和y与转变温度（A_r3）进行了比较，将其与具有常规Mn含量的商品钢进行了比较。使用Gleeble 3500测试机进行热机械加工的模拟。低锰合金设计的7_nr比高锰钢高7_nr，而低锰钢的A_r3高50℃左右。较高的A_r3促进了粗大的铁素体晶粒的形成，从而降低了细晶粒尺寸的强化和增韧益处。然而，这可以通过最大化在T_nr和A_r3之间执行的变形程度并保持高冷却速率和低于A_r3的低停止冷却温度的组合来克服，从而提供高密度的成核位置并促进高成核速率。生产试验验证了Gleeble测试的结果。

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