Last year,TSINGSHAN QN1803 stainless steel passed the CISA group standard and sold more than 100,000 tons in year 2019. Under the influence of the epidemic this year,according to the data statistics from January to the the end of may,the sales volume of TSINGSHAN QN series material products have exceeded the total volume of last year. Among them,what is the QN1803 growing against the trend? Many people think that it will become the mainstream product of the future,and may even fully replace the 304? So,what are the advantages of the QN1803 compared with 304?

1) Its spot corrosion equivalent(PREN=Cr+3.3Mo+30N-Mn)is above 19.0,with at least equal spot corrosion resistance as 304 stainless steel. In dilute hydrochloric acid,dilute sulfuric acid,acetic acid+salt and other environments,the uniform corrosion resistance is much better then the 304 stainless steel;

2) In the actual use state after bending,stamping,hard state and other cold processing and forming, the corrosion resistance is better than 304 stainless steel;

3) SS QN1803 yield strength is over 1.3 times of 304 stainless steel, and has the elongation rate of no less than 45%. Wear resistance and fatigue performance are better than 304 stainless steel;

4) Good welding performance: post-welding strength is higher than 304 stainless steel,corrosion resistance is comparable to 304 stainless steel.

On the one hand,as a high quality,high performance,low cost stainless steel products,QN1803 is not only meets the market demand,but also can improve the competitiveness of the whole Chinese stainless steel products and industry.

On the other hand, non-standard 200 series with poor corrosion resistance and unhealthy galvanized products with poor corrosion resistance will be phased out. Under the corrosive environment applicable to 202 and D11430, areas with higher requirements for strength will completely replace steel grades.

In addition,in the applicable corrosion environment of 304,QN1803 will fully replace the 304 the field with higher strength requirements,and become the mainstream of stainless steel products in the future.

In general,QN1803 ensures the corrosion resistance of the 304 stainless steel,improve the strength and hardness of the material. While reducing the cost of materials,QN1803 has higher cost performance and stronger market competitiveness than the 304 stainless steel. In the future QN1803 may fully replace the 304 in some areas.