Abstract: The effect of 0. 03% —0. 21% Si on structure and properties of 10B21 cold heading steel of containig boron (/% ：0.20C,0.03 〜0,21Si,0. 82 ~0. 83Mn,0, 009 〜0. 013S,0. 015 〜0. 016P,0.0019 ~ 0.0020B)Φ34 mm hot- rolled coil has been analyzed and studied. The end-rolling temperature of hot-rolling coil is 900℃ ,slow-cooling. Results show that with increasing Si content in 10B21 steel from 0. 03% to 0. 21% , the tensile strength of coil increasing from 480 MPa to 489 MPa, i. e. that increases by 9 MPa; the HRB hardness value increases by 5. 3 ； the size of ferrite groups in structure of steel reduces from 52μm; to 42 μm； the size and quantity of non-metallic inclusions has no obvious change ； and the hardenability of steel improves.

摘要： 分析和研究了0.03%～0.21%Si含量对含硼冷镦钢10B21 (/%:0.20C,0.03～0.21Si,0.82～0.83Mn,0.009～0.013S,0.015～0.016P,0.0019～0.0020B)Φ34 mm热轧盘条组织和性能的影响。盘条热轧的终轧温度为900℃,缓冷。结果表明,Si含量由0.03%增加到0.21%,10B21钢盘条抗拉强度由480MPa增加到489MPa,即增加了9MPa;HRB硬度值增加5.3,钢的组织中铁素体团尺寸由52μm降低至42μm,非金属夹杂物尺寸及数量无明显变化,淬透性能提高。