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    • 4. 发明专利
    • Manufacture of high strength rolled thick steel bar
    • 高强度轧制厚钢棒的制造
    • JPS6126730A
    • 1986-02-06
    • JP14591484
    • 1984-07-16
    • Sumitomo Electric Ind Ltd
    • MURAI TERUYUKIHASHIMOTO YOSHIHIRO
    • B21B45/02C21D8/08C21D9/52
    • C21D9/525C21D8/08
    • PURPOSE:To obtain a rolled thick steel bar having superior strength and toughness by controlling the temp. range of pearlite transformation and the maximum temp. when a hot rolled steel bar is cooled at a uniform rate. CONSTITUTION:When the hot rolled steel bar is cooled at the uniform rate, pearlite transformation is started at TC-(TC+40) deg.C (TC is the critical temp. contacting with the pearlite transformation start line in the CCT diagram of the steel bar), and controlled cooling is carried out so that the maximum temp. of heat recuperation during transformation is restricted to =about 20mm. diameter, >=about 120kg/m tensile strength and >=20% reduction of area is obtd. even when a rolled steel bar having ASTM No. >=8 grain size is used.
    • 目的:通过控制温度来获得具有优异强度和韧性的轧制厚钢筋。 珍珠岩转变范围和最高温度。 当热轧钢筋以均匀的速度冷却时。 构成:当热轧钢筋以均匀的速度冷却时,珠光体相变在TC-(TC + 40)℃下开始(TC是与CCT图中珠光体转变起始线的临界温度接触 钢棒),并进行控制冷却,使最大温度 在转化期间的热回收限于<=(TC + 80)℃。 通过该控制,具有> =约20mm的厚钢筋。 直径> =约120kg / m 2的拉伸强度和> = 20%的面积减少。 即使使用ASTM号> = 8粒径的轧制钢棒。
    • 6. 发明专利
    • Pc steel bar of small diameter and its manufacture
    • PC钢丝杆及其制造
    • JPS58197216A
    • 1983-11-16
    • JP7811182
    • 1982-05-12
    • Kajima Corp
    • MURAYAMA YASUONODA SUSUMU
    • B21C9/00C21D8/08E04C5/08
    • C21D8/08
    • PURPOSE:To manufacture a PC (prestressed concrete) steel bar having a small diameter, a high yield point, superior tensile strength, superior elongation and a low relaxation value by subjecting a high carbon steel material having a small circular cross-section to lead hardening, drawing and bluing under specified conditions. CONSTITUTION:A steel material having 0.60-0.95% carbon content, =80kg/mm. yield point, >=105kg/mm. tensile strength, >=5% elongation and
    • 目的:制造具有小直径,高屈服点,优异拉伸强度,优异伸长率和低松弛度的PC(预应力混凝土)钢筋,通过对具有小圆形横截面的高碳钢材料进行引导硬化 ,在规定的条件下绘图和蓝调。 构成:含有0.60-0.95%碳含量的钢材,<= 12.7mm。 直径和圆形横截面在加热炉中加热至800-1,000℃,并在500-600℃的熔盐浴中浸渍0.3-2分钟以进行铅硬化。 钢材以50-300m / min的拉丝速度和20-50%的面积减速率拉伸。 所得钢筋在350-500℃加热0.1-3min。 因此,具有<9mm的PC钢棒。 小直径> 80kg / mm 2屈服点≥105kg/ mm 2拉伸强度> 5%伸长率和<= 1.5%松弛值制造。