Table 13-2

Chapter 13 Wrought Stainless Steels

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CHEMICAL COMPOSITION OF WROUGHT FERRITIC STAINLESS STEELS^a

Type	UNS	C	Mn	Si	Cr	Ni	Mo	Other
405	S40500	0.08	1.00	1.00	11.5-14.5	---	---	0.10-0.30 Al
409	S40900	0.08	1.00	1.00	10.5-11.75	0.50	---	6 X %C min - 0.75 max Ti
429	S42900	0.12	1.00	1.00	14.0-16.0	---	---	---
430	S43000	0.12	1.00	1.00	16.0-18.0	---	---	---
430F^b	S43020	0.12	1.25	1.00	16.0-18.0	---	0.60^c	---
430F Se	S43023	0.12	1.25	1.00	16.0-18.0	---	---	0.15 min Se
434	S43400	0.12	1.00	1.00	16.0-18.0	---	0.75-1.25	---
436	S43600	0.12	1.00	1.00	16.0-18.0	---	0.75-1.25	5 X %C min - 0.70 max Nb
439	S43035	0.07	1.00	1.00	17.0-19.0	0.50	---	0.15 Al; 12 X %C min - 1.10 Ti
442	S44200	0.20	1.00	1.00	18.0-23.0	---	---	---
444	S44400	0.025	1.00	1.00	17.5-19.5	1.00	1.75-2.50	0.025 N; 0.2 + (%C + %N) min
								to 0.8 max (Ti + Nb)
446	S44600	0.20	1.50	1.00	23.0-27.0	---	---	0.25 N
E-Brite	S44627	0.01	0.40	0.40	25.0-27.0	0.50	0.75-1.50	0.05-0.2 Nb; 0.015 N; 0.2 Cu
26-1
MONIT	S44635	0.025	1.00	0.75	24.5-26.0	3.5-4.5	3.5-4.5	0.2 + 4 (%C + %N) min to
(25-4-4)								0.8 max (Ti + Nb); 0.035 N
Sea-Cure	S44660	0.025	1.00	1.00	25.0-27.0	1.5-3.5	2.5-3.5	0.2 + 4 (%C + %N) min to
(SC-1)								0.8 max (Ti + Nb); 0.035 N
AL 29-4C	S44735	0.030	1.00	1.00	28.0-30.0	1.00	3.60-4.20	0.20-1.00 Ti + Nb and 6 (%C + %N)
								min Ti + Nb; 0.45 N
AL 29-4-2	S44800	0.01	0.30	0.20	28.0-30.0	2.0-5.0	3.5-4.2	0.15 Cu; 0.02 N; 0.025 max (%C + %N)
a. Although sulphur and phosphorus contents are not listed in this table due to limited space, they are specified; see appropriate material
standard for more details.
b. Free-Machining grade with 0.15 % minimum sulphur.
c. Optional.
Single values are maximums, unless otherwise specified.

FERRITIC STAINLESS STEELS

430

General

Purpose

446

Cr increased

to improve

scaling

resistance

442

Cr increased

to improve

scaling

resistance

429

Slightly

less Cr for

better

weldability

405

Lower Cr

Al added

to prevent

hardening

when cooled

from elevated

temperature

409

Lower Cr

primarily

used for

automotive

exhaust

430F

P & S

added for

improved

machining

434

Mo added

for improved

corrosion

resistance

in auto trim

430F Se

Se added

for better

machined

surfaces

436

Mo Cb added

for corrosion

and heat

resistance &

improved

roping

The Ferrous Metals Data Book

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The Ferrous Metals Data Book