300 Series Stainless Steel Grades | 18.8 Stainless Steel

Fastener Solutions supplies a wide variety of materials and coatings for a range of industries including 18-8 stainless steel. The 18-8 Stainless Steel is the most widely used austenite steel in the 300 series and is also known as the 304. 300 series stainless steel has approximately 18% chromium, 8% nickel, are non-magnetic and hardenable by cold working; a tensile strength range of 80-200,000 psi; good corrosion resistance. The term “18-8” is used interchangeably to characterize fittings made of 302, 302HQ, 303, 304, 305, 384, XM7, and other variables of these grades with close chemical compositions.

There is little difference in corrosion resistance among the 18-8 types, although slight differences in chemical composition do make certain grades more resistant than others do against particular chemicals or atmospheres. The 18-8 stainless steel has superior corrosion resistance, (compared to the 400 series stainless) is generally nonmagnetic, and is hardenable only by cold working.

Characteristics of 18.8 Stainless Steel

·         Corrosion Resistance.

Applications for 18.8 Stainless Steel Fasteners

·         Chemical equipment.

·         Food and Drug equipment.

·         Bearing plates.

·         Heat exchanger tubes.

·         Pumps and valves.

18.8 Stainless Steel includes several alloys:

·         302: ASTM A276 Type 302; A167 Gr.2

·         XM7: 302HQ for cold heading screws

·         303: ASTM A582 Type 303; A320 Gr. B8F; A194 Gr. 8F

·         304: ASTM A193A Gr. B8; A320 Gr. B8; A194 Gr. 8


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