40CRNI是中国标准中规定的合金结构钢的车牌。自加州编号：A40402。

　　CR：0.45 ～0.75Ni：1.00 ～1.40抗拉力强度（σb/mpa）：≥980屈服点（σs/mpa）：≥785后伸长（Δ5/％）：≥10截面收缩率（ψ/%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%％; %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% ％，/%%）：≥45撞击吸收（AKU2/J）：≥55贝什硬度（HBS100/3000）（退火或高温恢复状态）：≤241用于创建锻造和冷st损伤和较大的横截面大小。例如连杆，圆盘，曲柄轴，齿轮，轴，螺钉等。