ALLOY 28 MECHANICAL PROPERTIES

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Alloy 28 Mechanical properties

The following values apply to solution annealed material, unless otherwise stated.

At 20°C (68°F)

Metric units

Proof strength		Tensile strength	Elong.		Hardness
Rp0.2a	Rp1.0a	Rm	Ab	A2"	HRB
MPa	MPa	MPa	%	%
≥220	≥250	550-750	≥40	≥40	≤90

Imperial units

Proof strength		Tensile strength	Elong		Hardness
Rp0.2a	Rp1.0a	Rm	Ab	A2"	HRB
ksi	ksi	ksi	%	%
≥32	≥36	80-109	≥40	≥40	≤90

1 MPa = 1 N/mm2
a) Rp0.2 and Rp1.0 correspond to 0.2% offset and 1.0% offset yield strength, respectively.
b) Based on L0 = 5.65 √S0 where L0 is the original gauge length and S0 the original cross-sectional area.

Tube, pipe, plate and sheet with material thicknesses >20 mm (0.787") and bar with diameters >100 mm (3.937")

Metric unit

Metric units

Proof strength		Tensile strength	Elong.		Hardness
Rp0.2a	Rp1.0a	Rm	Ab	A2"	HRB
MPa	MPa	MPa	%	%
≥200	≥230	550-750	≥40	≥40	≤90

Imperial units

Imperial units

Proof strength		Tensile strength	Elong		Hardness
Rp0.2a	Rp1.0a	Rm	Ab	A2"	HRB
ksi	ksi	ksi	%	%
≥29	≥33	80-109	≥40	≥40	≤90

Seamless cold worked tube and pipe

Intended for oil and gas production

	Proof strength		Tensile strength		Elong.	Hardness
	Rp0.2a)		Rm		A2"	HRC
	MPa	ksi	MPa	ksi	%
Alloy 28-110	≥760	≥110	≥795	≥115	11	≤35
Alloy 28-125	≥860	≥125	≥895	≥130	10	≤37

Impact strength

Due to its austenitic microstructure, Alloy 28 has very good impact strength, both at room temperature and at cryogenic temperatures.

Tests have demonstrated that the steel fulfils the requirements according to the European standards EN 13445-2 (UFPV-2) ( min. 60 J (44 ft-lb) at -270 oC (-455 oF)) and EN 10216-5 (min. 60 J (44 ft-lb) at -196 oC (-320oF)).

At high temperatures

Due to embrittlement caused by precipitation of intermetallic phases, Alloy 28 should not be exposed to temperatures above 600 °C (1110 °F) for prolonged periods.

According to the ASME Boiler and Pressure Vessel Code Table 1B, Alloy 28 is acceptable to 600ºF (316ºC) for Section III construction and 850ºF (455ºC) for Section I (Code Case 1325-18) and Section VIII, Division 1 construction.

Tube, pipe, plate and sheet with material thicknesses <20 mm (0.787") and bar with diameters <100 mm (3.937)>

Metric unit

Temperature	Proof strength		Tensile strength
	Rp0.2	Rp1.0	Rm
°C	MPa	MPa	MPa
	min	min	min
50	200	230	550
100	190	220	510
150	175	205	470
200	160	190	440
250	155	185	410
300	150	180	390
350	145	175	380
400	135	165	370
450	125	155	360
500	120	150	350
550	115	145	340

Imperial units

Temperature	Proof strength		Tensile strength
	Rp0.2	Rp1.0	Rm
°F	ksi	ksi	ksi
	min	min	min
120	29	33	80
210	28	32	74
300	25	30	68
390	23	28	64
480	22	27	59
570	22	26	57
660	21	25	55
750	20	24	54
840	18	22	52
930	17	22	51
1020	17	21	49

Tube, pipe, plate and sheet with material thicknesses >20 mm (0.787") and bar with diameters >100 mm (3.937")

Metric units

Temperature	Proof strength		Tensile strength
	Rp0.2	Rp1.0	Rm
°C	MPa	MPa	MPa
	min	min	min
50	180	205	550
100	160	190	510
150	150	180	470
200	140	170	440
250	130	160	410
300	120	150	390
350	115	140	380
400	110	135	370
450	105	130	360
500	100	125	350
550	95	120	340

Imperial units

Temperature	Proof strength		Tensile strength
	Rp0.2	Rp1.0	Rm
°F	ksi	ksi	ksi
	min	min	min
120	26	30	80
210	23	28	74
300	22	26	68
390	20	25	64
480	19	23	59
570	17	22	57
660	17	20	55
750	16	20	54
840	15	19	52
930	15	18	51
1020	14	17	49

Creep strength

Metric units

Temperature	Creep rupture strength
	10 000 h	100 000 h
°C	MPa	MPa
	approx.	approx.
550	262	193
600	186	146
650	122	93
700	82	62

Imperial units

Temperature	Creep rupture strength
	10 000 h	100 000 h
°F	ksi	ksi
	approx.	approx.
1020	38	28
1110	27	21
1200	18	13
1300	12	9

Alloy 28 (Tube and Pipe, Seamless)

Datasheet updated 2015-02-16 10:39:36 (supersedes all previous editions)

Alloy 28 is a high-alloy multi-purpose austenitic stainless steel for service in highly corrosive conditions. The grade is characterized by:

• Very high corrosion resistance in strong acids
• Very good resistance to stress corrosion cracking (SCC) and intergranular corrosion in various environments
• High resistance to pitting and crevice corrosion
• Good weldability

Standard

• UNS N08028
• ISO 4563-080-28-I
• EN number 1.4563
• EN name X 1 NiCrMoCu 31-27-4
• W.Nr. 1.4563
• DIN X 1 NiCrMoCuN 31 27 4
• SS 2584
• AFNOR Z1NCDU31-27-03

Product standards

Seamless tube and pipe:	ASTM B 668; EN 10216-5; SEW 400 (Feb 1991); SS 14 25 84; NFA 49-217
Plate, sheet and strip:	ASTM B 709, EN 10088-2; SS 14 25 84
Bar steel:	EN 10088-3; SS 14 25 84
Fittings:	ASTM A 403 (chemical composition and mechanical properties according to ASTM B668)

Approvals

Approved by the American Society of Mechanical Engineers (ASME) for use in accordance with ASME Boiler and Pressure Vessel Code, section III, section I (Code Case 1325-18) and section VIII, division 1. VdTÃœV-Werkstoffblatt 483 (Austenitischer Walz- und Schmiedestahl) NACE MR 0103 (Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments) NACE MR0175/ISO 15156 (sulphide stress cracking resistant material for oil field equipment) NGS 1608 (Nordic rules for application) valid for Alloy 28 made by

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