ALLOY 28 MECHANICAL PROPERTIES

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Mechanical Properties of Alloy 28

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

Mechanical Properties at 20°C (68°F)

Property	Metric Units	Imperial Units
Proof Strength (Rp0.2)	≥ 220 MPa	≥ 32 ksi
Proof Strength (Rp1.0)	≥ 250 MPa	≥ 36 ksi
Tensile Strength (Rm)	550 – 750 MPa	80 – 109 ksi
Elongation (Ab)	≥ 40%	≥ 40%
Reduction of Area (A2")	≥ 40%	≥ 40%
Hardness (HRB)	≤ 90	≤ 90

Mechanical Properties for Thickness > 20 mm (0.787") and Diameter > 100 mm (3.937")

Property	Metric Units	Imperial Units
Proof Strength (Rp0.2)	≥ 200 MPa	≥ 29 ksi
Proof Strength (Rp1.0)	≥ 230 MPa	≥ 33 ksi
Tensile Strength (Rm)	550 – 750 MPa	80 – 109 ksi
Elongation (Ab)	≥ 40%	≥ 40%
Reduction of Area (A2")	≥ 40%	≥ 40%
Hardness (HRB)	≤ 90	≤ 90

Seamless Cold Worked Tube and Pipe (For Oil & Gas Production)

Grade	Proof Strength Rp0.2	Tensile Strength Rm	Elongation Ab	Hardness (HRC)
Alloy 28-110	≥ 760 MPa (110 ksi)	≥ 795 MPa (115 ksi)	11%	≤ 35
Alloy 28-125	≥ 860 MPa (125 ksi)	≥ 895 MPa (130 ksi)	10%	≤ 37

Impact Strength

Due to its austenitic microstructure, Alloy 28 exhibits excellent impact strength at both room and cryogenic temperatures. It meets:

• EN 13445-2 (min. 60 J at -270°C)
• EN 10216-5 (min. 60 J at -196°C)

High Temperature Performance

Alloy 28 should not be exposed to temperatures above 600°C (1110°F) for prolonged periods due to embrittlement from intermetallic phases.

ASME Boiler and Pressure Vessel Code accepts Alloy 28 up to:
600°F (316°C) for Section III construction
850°F (455°C) for Sections I and VIII, Division 1 (Code Case 1325-18)

Temperature Dependent Mechanical Properties (Thickness < 20 mm, Diameter < 100 mm)

Temperature (°C)	Proof Strength Rp0.2 (MPa)	Proof Strength Rp1.0 (MPa)	Tensile Strength Rm (MPa)
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

Creep Strength (Rupture Strength)

Temperature (°C)	10,000 hours (MPa)	100,000 hours (MPa)
550	262	193
600	186	146
650	122	93
700	82	62

Standards and Certifications

• UNS: N08028
• ISO: 4563-080-28-I
• EN Number: 1.4563
• ASTM: B668, B709, A403, etc.
• ASME: Boiler & Pressure Vessel Code Sections I, III, VIII
• NACE: MR0103, MR0175/ISO 15156
• VdTÜV: Werkstoffblatt 483
• NGS 1608: Nordic corrosion-resistant alloy rules

Summary

Alloy 28 is a multi-purpose austenitic stainless steel engineered for highly corrosive environments. It offers excellent mechanical strength, corrosion resistance, and weldability, making it ideal for chemical processing, oil & gas, and related industries.

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