Stainless Steel - Ferritic

Ferritic Stainless Steels, which are part of the 400 series of stainless alloys, have chromium as their major alloying element and are typically low in carbon content. Ductility and formability are less than that of the austenitic grades. The corrosion resistance is comparable to that of the austenitic grades in certain applications. Thermal conductivity is about half that of carbon steels. Ferritic stainless steels are magnetic, they generally have good ductility and can be welded or fabricated without difficulty. These grades can be processed to develop an aesthetically pleasing, bright finish and, hence, are sometimes used for automotive trim and appliance molding. They also find use in functional applications where cost is a major factor, e.g., automotive exhaust systems, catalytic converters, radiator caps, and chimney liners. These grades can be hardened by cold rolling, but cannot be hardened as much as the austenitic alloys.

Stainless Steel - Ferritic
Alloy (UNS Designation)	End Use	Composition nominal wt%	Specifications	Density lb/in3 (g/cm3)	Tensile Strength ksi. (MPa)	0.2% Yield Strength ksi. (MPa)	Elong- ation %	Hardness

AL 18CrCb™ S44100	Exhaust system components	C 0.03 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 17.5-19.5, Ni 1.0 max, Ti 0.10-0.50, Cb (0.3+(9/C))min-0.9 max, N 0.03 max, Fe Balance		0.278 (7.70)	60min (415 min)	38 min (260 min)	25 min	88 Rockwell B max

ATI 409 HP™ S40900, S40910/S40920/S40930	Exhaust systems, mufflers, manifolds, exhaust pipes, catalytic converters, tail pipes, thermostats fuel filters, culverts, home heating systems, electrical transformer cases, caskets, heat exchanger tubing, farm equipment, blades, vanes in standby power generation turbines and jet engine sound-deadening devices at airports	C 0.03 max, Mn 1.0 max, P 0.04 max, S 0.02 max, Si 1.0 max, Cr 10.5-11.7, Ni 0.5, N 0.03, Ti 0.05 min, (Ti+Cb) [0.08+8x(C+N)] min-0.75 max, Fe Balance	ASTM A 176 ASTM A240/A240M ASME SA-240/SA-240M	0.280 (7.75)	55 min (380 min)	25 min (170 min)	20 min	88 Rockwell B max

AL 409 Cb™ S41045	Exhaust components	C 0.03 max, Mn 1.0 max, P 0.045 max, S 0.03 max, Si 1.0 max, Cr 12.0-13.0, Ni 0.5 max, N 0.03 max, Cb 9x(C+N) min-0.60 max.	ASTM A240	0.280 (7.75)	55 min (380 min)	30 min (205 min)	22 min	80 Rockwell B max

AL 410S™ S41008	Tower packing, distillation trays, automotive exhaust components, and other high-temperature applications	C 0.08 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 11.5-13.5, Ni 0.6 max, Fe Balance	ASTM A240 ASTM A176	0.280 (7.75)	60 min (415 min)	30 min (205 min)	22 min	89 Rockwell B max

AL 412™ S41003	Rail cars, coal handling equipment, sugar processing equipment, mining equipment, storage bins and hoppers, bus frames	C 0.03 max, Mn 1.5 max, Si 1.0 max, P 0.04 max, S 0.03 max, Cr 10.5-12.5, Ni 1.5 max, Fe Balance	ASTM A240	0.280 (7.75)	66 min (455 min)	40 min (275 min)	18 min	20 Rockwell C max

430 S43000	Interior and exterior trim applications such as sinks, sink rims, appliance trim, counter tops, dish washers, range hoods, flatware, roofing, siding and restaurant equipment	C 0.12 max, Mn 1.0 max, Si 1.0 max, Cr 16.0-18.0, Ni 0.75 max, Fe Balance	ASTM A240	0.278 (7.70)	65 min (450 min)	30 min (205 min)	22 min	89 Rockwell B max

AL 430 Ti™ S43036	Welded tubing.	C 0.10 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 16-19.5, Ni 0.75 max, Ti (5xC) min-0.75 max, Fe balance	ASTM A268 A554	0.280 (7.75)	60 min (415 min)	35 min (240 min)	20 min	90 Rockwell B max

AL 433™	Exhaust components	C 0.01, Mn 0.3, P 0.02, S 0.001, Si 0.4, Cr 20.0, Ni 0.25, Cu 0.5, N 0.02, Cb 0.54 (0.8 max) Cb/(C+N)>10, Fe Balance		0.280 (7.75)	63.4 (440)	46.7 (322)	31	79 Rockwell B

AL 436S™	Exhaust systems	C 0.01, Mn 0.2, P 0.02, S 0.001, Si 0.37, Cr 17.3, Ni 0.3, Mo 1.2, N 0.015, Ti/(C+N)>8		0.280 (7.75)	66 (455)	43 (296)	30.5	77 Rockwell B

439/AL 439 HP™ S43035	Automotive exhaust, manifolds and mufflers; residential funace primary heat exchangers; direct-fired hot water tanks; heat exchanger tubing	C 0.03 max, Mn 1.0 max, Si 1.0 max, Cr 17.0-19.0, Ni 0.5 max, N 0.03 max, Al 0.15 max, Ti [0.2+4(C+N)] min-1.10 max	Pipe & Tubing: ASTM A268 ASME SA268 ASTM A803 Flat Rolled Products: ASTM A240 ASME SA240 Bar Products: ASTM A479 ASME SA479	0.278 (7.70)	60 min (415 min)	30 min (205 min)	22 min	89 Rockwell B max

AL 441HP™ S44100	Exhaust Components	C 0.03 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 17.5-19.5, Ni 1.0 max, Ti 0.1-0.5, Cb 0.3+(9xC) min-0.9 max, Fe Balance		0.278 (7.70)	72 (495)	45 (310)	31	82 Rockwell B

AL 444™ S44400	Heat exchanger tubing, food processing equipment, hot water tanks, automotive exhaust	C 0.025 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 17.5-19.5, Ni 1.0 max, Mo 1.75-2.5, N 0.035 max, (Ti+Cb) [0.2+4(C+N)] min-0.8 max, Fe Balance	ASTM A240, A 268, A276 ASME SA 240, SA 268	0.280 (7.75)	60 min (415 min)	40 min (275 min)	20 min	96 Rockwell B max

AL 453™	Elevated temperature applications such as planar solid oxide fuel cells	C 0.03, Mn 0.3, P 0.02, S 0.03 max, Si 0.3, Cr 22.0, Ni 0.3, Al 0.6, Ti 0.02, (Ce+La) 0.1 max, Fe Balance		0.275 (7.61)	68 (470)	45 (310)	35	78 Rockwell B

AL 468™ S46800	Automotive exhaust, residential furnace primary heat exchangers	C 0.03 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 18.0-20.0, Ni 0.5 max, N 0.03 max, Ti 0.07-0.3, Cb 0.10-0.60, (Ti+Cb) [0.2+4(C+N)] min-0.8 max	ASTM A240	0,278 (7.70)	60 min (415 min)	30 min (205 min)	22 min	90 Rockwell B max

OHMALOY® 30 K91470	Grid resistors for mine locomotives, Crane starters, Braking resistors for railroad diesel locomotives	C 0.025, Mn 0.35, Si 0.3, Cr 13.0, Al 3.0, Ti 0.3, Fe Balance		0.270 (7.48)	76 (524)	55 (379)	28	88 Rockwell B

OHMALOY® 40 K91470	Grid resistors for mine locomotives, Crane starters and Braking resistors for railroad diesel locomotives	C 0.025, Mn 0.35, Si 0.3, Cr 13.0, Al 3.95, Ti 0.3, Fe Balance		0.267 (7.39)	87 (600)	65 (448)	23	88 Rockwell B