Effect of multi-element analyzer on sulfur, copper and chromium in gray cast iron

Effect of multi- element analyzer on sulfur, copper and chromium in gray cast iron

QL-S 3000C The computer infrared all-in-one multi- element analyzer is a multi-element joint measurement analyzer that is exclusively produced and owned by Nanjing Kirin Scientific Instrument Group Co., Ltd., which can quickly and accurately determine sulfur, copper and chromium in gray cast iron. The content of the elements. The product is international and domestic advanced technology integration crystallization, is a light, mechanical, electrical, computer, analysis of high-tech products, a number of leading domestic technology, machine performance can be comparable with imported products in 2009 identified It is a famous brand product in Jiangsu Province. It has the characteristics of wide measuring range, strong anti-interference ability, complete functions, simple operation and fast and accurate analysis results.

 

1 , sulfur    Reducing the fluidity of molten iron and increasing the tendency of hot cracking of castings are harmful elements in castings. Many people think that the lower the sulfur content, the better, but it is not. When the sulfur content is ≤ 0 . At 05 %, such cast iron does not work for the common inoculant we use, because it is very fast, and often produces white mouth in the casting.

2 , copper    Copper is the most commonly added alloying element for the production of grey cast iron, mainly due to the low melting point of copper ( 1083 ° C ), easy to melt, good alloying effect, copper graphitization ability is about 1 / 5 of silicon , so it can reduce the white mouth tendency of cast iron, and copper can also reduce the critical temperature of austenite transformation, so copper can promote pearl light The formation of the body increases the content of pearlite, and at the same time refines the pearlite and strengthens the pearlite and the ferrite therein, thereby increasing the hardness and strength of the cast iron. However, the higher the amount of copper, the better. The suitable amount of copper is 0 . 2 % to 0 . 4 % When a large amount of copper is added, the addition of tin and chromium at the same time is detrimental to the cutting performance, which causes a large amount of soxite structure to be generated in the matrix structure.

3 , chrome    The alloying effect of chromium is very strong, mainly because the chrome increases the tendency of the molten iron white mouth, and the casting is easy to shrink, resulting in waste. Therefore, the amount of chromium should be controlled. On the one hand, it is hoped that the molten iron contains a certain amount of chromium to improve the strength and hardness of the casting; on the other hand, the chromium is strictly controlled to the lower limit to prevent the casting from shrinking and the scrap rate is increased. Traditional experience suggests that the amount of chromium in the original molten iron exceeds zero . At 35 %, it will have a fatal effect on the casting.