Mn含量对低碳冷镦钢SWRCH22A组织和性能的影响  被引量:2

Effect of Mn Content on Microstructure and Properties of Low-Carbon Cold-Heading Steel SWRCH22A

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作  者:王冬晨 阮士朋 董庆 李敏锐 张国安 Wang Dongchen;Ruan Shipeng;Dong Qing;Li Minrui;Zhang Guoan(Technology Center,Xingtai Iron and Steel Corp Ltd,Xingtai 054027;Hebei Province Engineering and Technology Innovation Center for Wire Rod,Xingtai 054027)

机构地区:[1]邢台钢铁有限责任公司技术中心,邢台054027 [2]河北省线材工程技术创新中心,邢台054027

出  处:《特殊钢》2021年第4期84-86,共3页Special Steel

基  金:河北省省级科技计划资助(205676134H)。

摘  要:分析研究了Mn含量0.78%-0.92%对0.20%碳冷镦钢Φ20 mm热轧盘条组织和力学性能的影响。盘条热轧的终轧温度为880℃,缓冷。结果表明,Mn含量由0.78%增加至0.92%时,盘条抗拉强度由485 MPa升高至508 MPa,增加了23 MPa,伸长率由31%降至28%,下降了3个百分点,断面收缩率由58%降52%,下降6个百分点;HRB硬度值增加4.5;试验钢组织中铁素体晶粒尺寸由28μm降低至18μm,珠光体比例由23%增加至26%;且珠光体片层间距有所减小,淬透性能提高。Effect of 0.78~0.92% Mn on structure and mechanical properties of Φ20 mm hot-rolled coil of 0.20%carbon cold-heading steel has been analyzed and studied.End-rolling temperature of hot-rolling coil is 880 ℃,slow-cooling.Results show that with increasing Mn in steel from 0.78% to 0.92%,the tensile strength of coil increases from 485 MPa to508 MPa,i.e.that increases by 23 MPa;the elongation decreases from 31% to 28%,i.e.decreases by 3 point of percentage,and the reduction of area decreases from 58% to 52%,i.e.decreases by 6 point of percentage;the HRB hardness value increases by 4.5.The size of ferrite groups in structure of test steel reduces from 28 μm to 18 μm,the pearlite content in structure increases form 23% to 26% and the pearlite lamellar spacing decreases slightly;the hardenability of steel improves.

关 键 词:MN含量 低碳冷镦钢SWRCH22A 热轧盘条 组织 力学性能 

分 类 号:TG142.1[一般工业技术—材料科学与工程]

 

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