摘要
为使PSB785精轧螺纹钢筋强度与塑性相匹配,采用以下工艺:(1)钢坯加热出炉温度为960～1 020℃,开轧温度为970℃;(2)轧件进精轧机温度为850～890℃,钢筋的终轧温度为930～1 000℃,自回火温度为680～700℃;(3)上冷床温度为560～600℃。采用设计工艺生产的25,32 mm PSB785精轧螺纹钢筋的抗拉强度为1 021～1 055MPa,延伸率为8.5%～9.6%,金相组织为珠光体+铁素体,晶粒度为9.0～9.5级,穿水层为回火索氏体,穿水层深度为1.24～1.46 mm,符合GB/T 20065—2006《预应力混凝土用螺纹钢筋》,可满足用户的使用要求。
In order to match PSB785 fine rolling spiral bar＇ s stress with its plasticity, below technology is used ： （ 1 ） billet heating tapping temperature is 960 - 1 020 ~C, blooming temperature is 970℃ ; （2） the entering temperature is 850 - 890 % , spiral bar＇ s final rolling temperature is 930 -1 000 ℃ , self-tempering temperature is 680 - 700 ℃ ; （ 3 ） going-on- cooling-bed temperature is 560 - 600℃. The tensile strength of diameter 25 and 32 mm PSB785 fine rolling spiral bar based on above technology is 1 021- 1 055 MPa, coefficient of extension is 8.5% -9.6%, metallographic structure is pearlite and ferrite, grain size is 9.0- 9.5 grade, the quenching layer is tempering sorbite, the thickness of quenching layer is 1.24 - 1.46 mm, which meet GB/T 20065--2006 rolling spiral bar for pre-stressed concrete and satisfy customers＇ needs.
出处
《金属制品》
2012年第3期63-65,70,共4页
Metal Products
关键词
PSB785
精轧螺纹钢
控冷轧制
生产工艺
PSB785
fine spiral bar
cooling control rolling
production technology
