Stainless Steel Information & Composition

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This information page does NOT include stainless steel blade steels.

17-4 17-7 301 303 304 308 310 321 347 410 416

Alloy Description
17-4
One of the most widely used precipitation hardening stainless steels. It is soft and ductile in the annealed condition.

When heat treated it has good corrosion resistance, high hardness, toughness and strength. Commonly used in aircraft and gas turbines, nuclear reactor, paper mill, oil field, and chemical process components.

Maximum Hardness: 44 HRC when heat treated.

17-7
Another precipitation hardening stainless steel combining high strength, medium corrosion resistance. Used for applications requiring good strength, corrosion resistance and mechanical properties up to 800F.

Is often used for intricate parts due to its low distortion in heat treatment. Very stable. Commonly found in a variety of springs and washers.

Maximum Hardness: 43 HRC when heat treated.

301
It possesses greater ductility than 302 and 304 but work hardens much more quickly. It cannot he hardened by heat treatment. It is non-magnetic as annealed but slightly magnetic after cold working.

Applications include aerospace structural parts, trailer bodies, auto trim, utensils and tablewear.

Maximum Hardness: 41 HRC.

303
One of the most popular of all the stainless steels. It offers good strength, corrosion resistance and great machinability.

Applications include hardware, fasteners, valve parts, nozzles and trim.

Maximum Hardness: 262 Brinell or 26 HRC. Cannot be hardened by heat treatment.

304
One of the most widely used and oldest of the stainless steels. It possesses an excellent combination of strength, corrosion resistance.

Almost every industry uses this material in some way. Everything from stovetops to ballpoint pen barrels to flatware to fasteners.

Maximum Hardness: 201 Brinell or 15 HRC. Cannot be hardened by heat treatment.

308
This steel is used for filler wire and rod or to coat welding wire and rod. The corrosion resistance of 308 is equal to or greater than the material being welded.

310
This stainless steel was designed to be used in high temperature conditions up to 2,100°F.

Uses include oven linings, kilns, burners, combustion tubes, refractory anchor bolts, furnace components, etc.

Maximum Hardness: 217 Brinell or 18 HRC. Cannot be hardened by heat treatment.

321
The key feature of 321 is its resistance to intergranular corrosion. It employs titanium to prevent carbide formation. The alloy has superior strength compared to 304 stainless.

This alloys is used in jet engine parts, furnaces, expansion joints, turbochargers, oil refineries, exhaust manifolds and high temperature chemical production equipment.

Maximum Hardness: 217 Brinell or 18 HRC. Cannot be hardened by heat treatment.

347
Similar to 321 stainless, 347 uses columbium to resist to intergranular corrosion. It can be used in applications requiring repeated heating in the range of 800F to 1650F.

It is used in high temperature gaskets and expansion joints, rocket engine parts, exhaust manifolds and chemical production equipment.

Maximum Hardness: 201 Brinell or 15 HRC. Cannot be hardened by heat treatment.

410
410 has good impact strength, corrosion and scaling resistance up to 1200 F. It is magnetic in all conditions.

Since 416 has become more difficult to find, 410 has become more popular. It is used in custom knives for guards, bolsters, pommels, butt caps, liners, spacers, etc. Some factory frame locks are made from 410.

Maximum Hardness: 43 HRC when heat treated. Click here to go to the heat treating information.

416
416 is a heat treatable stainless steel with excellent machinability and non-galling characteristics. It is magnetic in all conditions.

It is used extensively in custom knives for guards, bolsters, pommels, butt caps, liners, spacers, etc.

416 is a free machining version of 410.

Maximum Hardness: 43 HRC when heat treated. Click here to go to the heat treating information.

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