Ferritic stainless steel is the preferred material for automobile exhaust pipe
1) Ferritic stainless steel does not contain or contains less precious metal Ni, and the cost of raw materials is low.
2) Ferritic stainless steel has low thermal expansion coefficient, high thermal conductivity, good oxidation resistance under repeated heating and cooling conditions, and good resistance to pitting corrosion.
3) Compared with austenitic stainless steel, ferritic stainless steel has good chloride resistance, stress corrosion and intergranular corrosion resistance.
4) Ferritic stainless steel stabilized by Nb and Ti has excellent creep resistance.
5) Ferritic stainless steel has little resilience in cold forming.

410 stainless steel tube has good corrosion resistance and machinability, and is generally used as a cutting tool.
430 stainless steel has good corrosion resistance, and 430 welded pipes are commonly used in interior decoration, heavy oil burner parts, household appliances, and household appliance parts.
436 stainless steel is a modified steel grade of 434 that reduces the tendency to "wrinkle" during relatively stringent stretch forming operations. Compared to 430, 434 and 436 have better corrosion resistance.

The 439 steel grade is based on the ordinary ferrite material (430) to reduce the content of C, and the addition of stabilizing elements such as Ti, so that the steel species have improved intergranular corrosion resistance, formability and weldability. 439 welded pipe is mainly used for decorative structural parts, structural pipes, automotive exhaust system components, washing machine inner cylinder, etc.

Chemical composition:

Grade	UNS	Chemical Component %
		C	Mn	P	S	Si	Cr	Ni	Mo	Nb
410	S41000	0.08~0.15	1.00	0.04	0.03	1.00	11.50-13.50	0.75	-	-
430	S43000	0.12	1.00	0.04	0.03	1.00	16.0-18.0	0.75	-	-
436	S43600	0.12	1.00	0.04	0.03	1.00	16.0-18.0	-	0.75-1.25	5C-0.80

Stainless steel pipe packing:

Production line and warehouse:

Stainless steel pipe test: