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乌拉尔车辆工厂生产联合体研制并应用20Φ铸钢来替代20 1Φ铸钢。20Φ铸钢的成份为(%):0.17～0.25C;0.7～1Mn;0.015～0.06A1;0.01～0.06V;0.01Ca;≤0.02Ti;≤0.003B。S、P、Cu、Cr和Ni的含量不变。20Φ铸钢在正火状态下能保证侧架和摇枕的使用,以及在调质状态下能保证自动车钩钩体获得所需的使用性能。这种钢经950℃正火后,σ_T≥340MPa,而经950℃淬火和高温回火后,σ_T≥394MPa。此时冷脆转变点也降低了,铁素体晶粒也得到了细化。
Ural vehicle factory production consortium developed and applied 20Φ cast steel instead of 20 1Φ cast steel. 20Φ cast steel composition (%): 0.17 ~ 0.25C; 0.7 ~ 1Mn; 0.015 ~ 0.06A1; 0.01 ~ 0.06V; 0.01Ca; ≤ 0.02Ti; ≤ 0.003B. S, P, Cu, Cr and Ni content unchanged. The 20Φ cast steel ensures the use of sideframes and bolsters in the normalized condition as well as ensuring the required performance of the auto coupler hook body during conditioning. After this kind of steel is normalized by 950 ℃, σ_T≥340MPa, and after quenching and high temperature tempering at 950 ℃, σ_T≥394MPa. Cold-brittle transition point is also reduced at this time, ferrite grains have also been refined.