Generally, the measures taken to improve the impact toughness of duplex stainless steel fittings are nothing but the following:
1. reduce the carbon content of dual phase steel pipe fittings;
2., increase the ratio of manganese to carbon (Mn/c);
3. adding alloying elements, such as Ni, Cr, Mo, etc.;
4. reduce sulfur content;
5. reduce the sulfur content inclusion in duplex stainless steel pipe fittings and improve the morphology of sulphide inclusion;
6., the use of furnace refining process;
7. improved heat treatment
In the above measures, the improvement of heat treatment is the first choice that should be paid attention to, because:
1. does not result in significant adjustments in the casting process;
2. do not have to add equipment;
3. production costs are increasing little.
Source: China Duplex Stainless Steel Pipe Fittings Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)
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