Haynes 188

Haynes 188 Chemical Composition

%	Cr	Ni	Co	W	La	B	C	Fe	Mn	Si	P	S
Min	20	20	–	13	0.02	–	0.05	–	–	0.2	–	–
Max	24	24	Balance	16	0.12	0.015	0.015	3	1.25	0.5	0.02	0.015

Haynes 188 Physical Properties

Density	Melting range
8.97 g/cm³	1302-1410°C

Haynes 188 Mechanical Properties

Mechanical & Physical Properties	21°C	427°C	538°C	649°C	760°C	871°C	982°C	1093°C
Ultimate Tensile Strength /MPa	944.6	–	–	710.2	620.5	413.7	241.3	131
0.2% Yield Strength /MPa	462	–	–	275.8	268.9	248.2	131	62.1
Elongation %	53	–	–	59	63	64	59	–
Coefficient of Thermal Expansion µm/m⁰C	–	14	14.8	15.5	16.2	16.9	17.8	–
Thermal Conductivity /kcal/(hr.m.°C)	–	15.5	17.1	18.9	20.7	21.6	23.5	–
Modulus of Elasticity/ x105 MPa	2.34	2	1.93	1.79	1.72	1.65	1.52	–

Haynes 188 Typical Stress Fracture Strength

Temperature, °F	1400	1500	1600	1700	1800
100 hours, ksi	32	22	14	9	5
1000 hours, ksi	23	15	9	6	2

Features:

Haynes 188 is a cobalt-based superalloy offering exceptional high-temperature strength, oxidation resistance, and corrosion resistance. Key characteristics include: maintained mechanical stability at extreme temperatures up to 2200°F (1200°C); superior thermal fatigue and creep resistance; high tolerance to corrosive environments containing sulfides/chlorides; excellent fabricability and weldability for complex component manufacturing.

Applications:

This alloy is extensively used in aerospace applications (gas turbine blades, combustion chamber components), industrial gas turbine hot-section parts, high-temperature reactors in petrochemical equipment, nuclear system structural components, and medical device corrosion-resistant elements. Its thermal stability also makes it ideal for furnace linings and industrial heating elements in high-temperature processing environments.