通过改进浇注系统，特别是采取在进、排气道芯砂中添加特殊抗脉纹添加剂及在砂芯表面涂刷烧结型涂料等工艺，有效地预防和消除了脉纹缺陷。
Veining defects have been effectively prevented and eliminated by improvement on gating system, especially by special additive to core sand and sinter coating on surface of sand core.
加入稀土元素，大大提高了催化剂的活性、抗毒性与抗烧结性；
Rare earth elements added greatly improves the catalytic activity, anti-toxic and anti-sintering;
加入稀土元素，大大提高了催化剂的活性、抗毒性与抗烧结性；
Rare earth elements added greatly improves the catalytic activity, anti-toxic and anti-sintering;
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