冷压塑形制样-光电直读光谱法测定碳素钢钢丝中C、Si、Mn、P、S、Cr、Ni、Cu的含量

Photoelectric Direct-Reading Spectroscopy Determination of C,Si,Mn,P,S,Cr,Ni and Cu in Carbon Steel Wire Prepared by Cold Pressure Moulding

用冷压法将外径在0.5mm以下的碳素钢钢丝样品加工制成直径为40mm的圆片状样品,供光电直读光谱测定C、Si、Mn、P、S、Cr、Ni、Cu。将碳素钢钢丝样品(外径小于0.5mm)置于高温炉中,在0.3MPa压力的氩气气氛中于825℃保温30min作退火处理,将样品冷却至常温(注如样品为低碳钢,无需退火处理)。用砂纸将样品打磨至金属光泽,用无水乙醇擦洗并晾干。将样品剪成长为40mm的小段,放入压样机的铝杯内,加盖。根据样品的抗拉强度选择合适的压力值和时间值,以缓慢加压模式将样品压制成直径为40mm的圆片状样品用于直读光谱分析。对所制分析样品以3点激发的方式测定了上述8种元素。经与国家标准方法湿法分析结果对照,两种方法的结果完全相符,证明方法所制备的样品具有良好的可靠性和适用性。

Cold pressure moulding was proposed for preparation of sample disc with diameter of 40 mm from carbon steel wire samples with external diameter less than 0.5 mm,and used for determination of C,Si,Mn,P,S,Cr,Ni and Cu by photoelectric direct-reading spectroscopy.The carbon steel wire samples(with external diameter less than 0.5 mm)were annealed in a muffle furnace at 825℃for 30 min in Ar-atmosphere with Ar-pressure of0.3 MPa(for low-carbon steels,the annealing was not necessary).After cooling to normal atmospheric temperature,the wire samples were polished with sandpaper to give metallic lustre,then cleaned with absolute alcohol and dried in air.The samples were cut into segments of 40 mm in length,and were placed into the aluminum cup of the cold extrusion press and well covered.Working parameters of pressure and time of the press were adjusted to definite values according to the value of tensile strength of the samples and the wire segments were treated by cold-extrusion under the mode of slow pressurization to give sample discs with diameter of 40 mm,which were suitable for use in direct-reading spectroscopy.Sample discs of carbon steel wire samples were prepared by the method mentioned above were analyzed with 3 point excitation for determination of the 8 elements,which were determined simultaneously by a checking analysis with wet analytical methods given by GB method,giving analytical results of the 8 element found by this method in good consistency with the results found by the methods of GB standards(wet analysis),showing that the proposed method of sample preparation from carbon steel wire was good in reliability and feasibility.