高质量特种焊丝控制成分制定依据

Establishment basis of control component of high quality special welding wire

高质量特种合金结构钢焊丝类产品的特点是w（C）极差要求很小,为0.030%,并要求成品w（P）≤0.007%,w（N）≤0.007%,成分窄,含量低,冶炼控制非常困难。统计C、P、N化学成分偏差,并利用柏拉图进行分析,得出不同的控制偏差对成品成分合格率的贡献率。w（C）偏差按照0~0.02%来控制,成品成分合格率可达到89.1%;w（P）偏差按照0控制,合格率达79.4%,按照＋0.001%控制,合格率可达93.7%,按照＋0.002%控制,成分合格率可以达到96.8%,按照＋0.003%控制,成分合格率可以达到100%;w（N）偏差按照0控制,成分合格率就可达81.6%,成分偏差按照＋0.001%控制,成分合格率可以达到95.9%,成分偏差按照＋0.002%控制,成分合格率可以达到100%。

The feature of high quality special structural alloy steel welding wire products are as follows： requirement of w（ C） range is very small; mass fraction is 0. 030%; require products w（ P） ≤0. 007%,w（ N） ≤0. 007%,composition is narrow,content is low,melting control is very difficult. Chemical composition mass fraction deviation of C,P and N are calculated,and use pareto to analyze,get the contribution rate of different control deviation for the product qualified rate.w（ C） deviation is controlled according to 0 ~ 0. 02%,product composition qualified rate can reach 89. 1%; w（ P） deviation is controlled according to 0,qualified rate can reach 79. 4%,qualified rate can reach 93. 7% according to ＋ 0. 001%control,composition qualified rate can reach 96. 8% according to ＋ 0. 002% control,composition qualified rate can reach100% according to ＋ 0. 003% control; w（ N） deviation is controlled according to 0,composition qualified rate can reach81. 6%,composition deviation is controlled according to ＋ 0. 001%,composition qualified rate can reach 95. 9%,composition deviation is controlled according to ＋ 0. 002%,composition qualified rate can reach 100%.