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高强度热处理钢筋是遵照毛主席的“自力更生”方针,立足本国资源发展起来的。现在天津钢厂、北京第一轧钢厂等均已生产。目前生产的这类钢筋为V级钢筋,主要性能指标按Y B 171-69规定为直径6—10毫米,σ_b≥160公斤/毫米~2,σ_(0.2)≥145公斤/毫米~2,δ_(10)≥6%。轧制成螺纹外形,以热处理状态供应。用此种钢筋代替原用的高强度碳素钢丝制造预应力钢筋混凝土轨枕,不但降低成本,而且简化工艺,对于国民经济具有较大的意义·但是,目前在使用热处理钢筋时,有时还出现低应力脆断现象,影响大
High-strength heat treatment of steel is to comply with Chairman Mao’s “self-reliance” approach, based on domestic resources developed. Now Tianjin Steel, Beijing No.1 Rolling Mill, etc. have been produced. The current production of such rebar for the V-class steel, the main performance indicators by YB 171-69 provisions for the diameter of 6-10 mm, σ_b ≥ 160 kg / mm ~ 2, σ_ (0.2) ≥ 145 kg / mm ~ 2, δ_ 10) ≥6%. Rolled into a thread profile, to heat treatment state of supply. Replacing the original high-strength carbon steel wire with such steel bar to make prestressed concrete sleepers not only reduces the cost but also simplifies the process, which is of great significance to the national economy. However, at present, when using heat-treated steel bars, sometimes low Stress brittle fracture phenomenon, big impact