ASTM A1049 / A1049M

This specification covers ferritic/austenitic (duplex) stainless steel forgings for boilers, pressure vessels, and associated equipment in grades that are also found in Specification A 182/A 182M.The purchaser may specify in the order or contract any appropriate supplementary requirements that are provided in Specification A 788/A 788M. Unless the order specifies the applicable “M” specification designation the material shall be furnished to the inchpound units.

Grade

UNS Designation	Grade
S31200	F50
S31803	F51
S32950	F52
S32750	F53
S39274	F54
S32760	F55
S39277	F57
S32520	F59
S32205	F60
S32550	F61

Note: A Water quenching is required unless the use of another liquid quenching medium is approved by the purchaser

Chemical Properties

Grade	Carbon, max	Manganese, max	Phosphorus, max	Sulfur, max	Silicon, max	Nickel	Chromium	Molybdenum	Nitrogen	Copper	Tungsten
S31200	0.030	2.00	0.045	0.030	1.00	5.5-6.5	24.0-26.0	1.20-2.00	0.14-0.20	. . .	. . .
S31803	0.030	2.00	0.030	0.020	1.00	4.5-6.5	21.0-23.0	2.5-3.5	0.08-0.20	. . .	. . .
S32950	0.030	2.00	0.035	0.010	0.60	3.5-5.2	26.0-29.0	1.00-2.50	0.15-0.35	. . .	. . .
S32750	0.030	1.20	0.035	0.020	0.80	6.0-8.0	24.0-26.0	3.0-5.0	0.24-0.32	0.50 max	. . .
S39274	0.030	1.00	0.030	0.020	0.80	6.0-8.0	24.0-26.0	2.5-3.5	0.24-0.32	0.20-0.80	1.50-2.50
S32760	0.030	1.00	0.030	0.010	1.00	6.0-8.0	24.0-26.0	3.0-4.0	0.20-0.30	0.50-1.00	0.50-1.00
S39277	0.025	0.80	0.025	0.002	0.80	6.5-8.0	24.0-26.0	3.0-4.0	0.23-0.33	1.20-2.00	0.80-1.20
S32520	0.030	1.50	0.035	0.020	0.80	5.5-8.0	24.0-26.0	3.0-5.0	0.20-0.35	0.50-3.00	. . .
S32205	0.030	2.00	0.030	0.020	1.00	4.5-6.5	22.0-23.0	3.0-3.5	0.14-0.20	. . .	. . .
S32550	0.04	1.50	0.040	0.030	1.00	4.5-6.5	24.0-27.0	2.9-3.9	0.10-0.25	1.50-2.50	. . .

Note :
A PREN = Cr + 3.3(Mo) + 16(N)
B PREN = Cr + 3.3(Mo + 1⁄2 W) + 16(N)

Mechanical Properties

UNS Designation	Grade	Tensile Strength ksi [MPa] Minimum or Range	Yield Strength 0.2 % Offset ksi [MPa] Minimum	Elongation % in 2 in. or 50 mm Minimum	Reduction of Area % Minimum	Brinell Hardness HB Maximum
S31200	F50	100-130 [690-900]	65 [450]	25	50	. . .
S31803	F51	90 [620]	65 [450]	25	45	. . .
S32950	F52	100 [690]	70 [485]	15	45	. . .
S32750	F53	116 [800]	80 [550]	15	45	310
S39274	F54	116 [800]	80 [550]	15	30	310
S32760	F55	109-130 [750-900]	80 [550]	25	45	. . .
S39277	F57	118 [815]	85 [585]	25	50	. . .
S32520	F59	112 [770]	80 [550]	25	40	. . .
S32205	F60	95 [655]	70 [485]	25	45	. . .
S32550	F61	109 [750]	80 [550]	25	50	. . .