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曾研究了铌对252钢性能的影响。试验用钢的化学成分见表1。钢锭锻制成φ15×200毫米的钢棒,于900℃保温25分钟油淬,并于550℃回火2小时空冷,经热处理的毛坯制成拉伸和冲击弯曲标准试样。其机械性能(6～8个试样的平均值)列于表2。
The effect of niobium on the properties of 252 steel has been studied. The chemical composition of the test steel in Table 1. Steel ingots were forged into φ15 × 200 mm steel bars, oil-quenched at 900 ° C for 25 minutes, and tempered at 550 ° C for 2 hours for air cooling. The heat-treated blanks were subjected to standard tensile and impact bending tests. Its mechanical properties (average of 6 to 8 samples) are listed in Table 2.