Finishes & Alloys

304/L Austenitic Grade

STAINLESS STRUCTURALS STOCKING GRADE

304/L is the low carbon variation of 304 (max carbon of .03) stainless steel. It is one of the most common and versatile grades of stainless steel. This austenitic grade exhibits excellent corrosion resistance, formability, and weldability. Some refer to 304/L as 18/8 stainless for its minimum of 18% chromium and 8% nickel. 304/L meets the corrosion properties of 304 and has slightly lower mechanical properties.

APPLICATIONS:

Food Processing
Architectural
Kitchen and Appliance
Construction
Chemical Processing

CHEMICAL COMPOSITION:

Carbon :                  0.03 max
Chromium :            18.0 – 20.0
Nickel :                    8.0 – 11.0
Manganese :          2.0 max
Silicon :                   0.75 max
Nitrogen :               0.10 max
Phosphorus :         0.045 max

MECHANICAL PROPERTIES:

Yield Strength :     25 KSI min
Tensile Strength : 70 KSI min
Elongation :           40%
Hardness :             92 Rockwell B

304H Austenitic Grade

304H grade is a modification of the most widely used 18/8 stainless. 304H has a controlled carbon content (carbon of .04 to .10 %) which increases its strength at elevated temperatures. 304H has a corrosion resistance similar to 304/304L. This austenitic grade is subject to carbide precipitation in weld zones due to its higher carbon content.

APPLICATIONS:

Oil and Gas
Boilers and Heat Exchangers
Power and Industrial Plants

CHEMICAL COMPOSITION:

Carbon :                  0.04 – 0.10
Chromium :            18.0 – 20.0
Nickel :                    8.0 – 10.5
Manganese :          2.0 max
Silicon :                   0.75 max
Nitrogen :               0.10 max
Phosphorus :         0.045 max

MECHANICAL PROPERTIES:

Yield Strength :     30 KSI min
Tensile Strength : 70 KSI min
Elongation :           40%
Hardness :             92 Rockwell B

308 Austenitic Grade

308 is an austenitic grade of stainless steel. It is most commonly used as a filler material when welding type 304 stainless. 308 grade contains 20% chromium and 11% nickel.

APPLICATIONS:

Filler material when welding 304 Stainless

CHEMICAL COMPOSITION:

Carbon :                  0.08 max
Chromium :            19.0 – 21.0
Nickel :                    10.0 – 12.0
Manganese :          2.0 max
Silicon :                   0.75 max
Phosphorus :         0.045 max

MECHANICAL PROPERTIES:

Yield Strength :     30 KSI min
Tensile Strength : 85 KSI min
Elongation :           40%
Hardness :             88 Rockwell B

316/L Austenitic Grade

STAINLESS STRUCTURALS STOCKING GRADE

316/L is the lower carbon variation of 316 (max carbon of .03) stainless steel. This austenitic grade provides higher corrosion and pitting resistance than type 304/304L because of its higher nickel and molybdenum content. 316/L also has higher strength at elevated temperatures and it avoids carbide precipitation due to welding. 316/L has excellent weldability but is more difficult to form and machine than type 304. 316/L has slightly lower mechanical properties than straight 316 grade.

APPLICATIONS:

Chemical Processing
Food Processing / Packaging
Water/Wastewater and Marine
Pulp and Paper
Construction

CHEMICAL COMPOSITION:

Carbon :                  0.03 max
Chromium :            16.0 – 18.0
Nickel :                    10.0 – 14.0
Manganese :          2.0 max
Silicon :                   0.75 max
Nitrogen :               0.10 max
Phosphorus :         0.045 max

MECHANICAL PROPERTIES:

Yield Strength :     25 KSI min
Tensile Strength : 70 KSI min
Elongation :           40%
Hardness :             95 Rockwell B

321 Austenitic Grade

321 is an austenitic stainless steel that is similar to 304 in corrosion resistance and weldability. 321 is harder to form than most austenitic grades because of its spring back effect. The benefit of 321 is that it has added titanium of five times the carbon content, which prevents or reduces carbide precipitation during welding. This alloy is generally used in high-temperature applications.

APPLICATIONS:

High Temperature applications
Chemical Processing
Aircraft engines
Oil and Gas
Expansion joints

CHEMICAL COMPOSITION:

Carbon :                  0.08 max
Chromium :            17.0 – 19.0
Nickel :                    9.0 – 12.0
Titanium :               0.70 max
Manganese :          2.0 max
Silicon :                   0.75 max
Phosphorus :         0.04 max

MECHANICAL PROPERTIES:

Yield Strength :     30 KSI min
Tensile Strength : 75 KSI min
Elongation :           40%
Hardness :             95 Rockwell B

347 Austenitic Grade

347 stainless steel is stabilized with columbium, which eliminates carbide precipitation. 347 is similar to 321 but has slightly better corrosion resistance in oxidizing environments. 347 has very good intergranular corrosion resistance when welded. Like 321, this alloy is generally used in high-temperature environments.

APPLICATIONS:

Heat Exchangers
Chemical Processing
Oil Refineries

CHEMICAL COMPOSITION:

Carbon :                  0.04 – 0.08
Chromium :            17.0 – 19.0
Nickel :                    9.0 – 13.0
Manganese :          2.0 max
Silicon :                   0.75 max
Phosphorus :         0.045 max

MECHANICAL PROPERTIES:

Yield Strength :     30 KSI min
Tensile Strength : 75 KSI min
Elongation :           40%
Hardness :             95 Rockwell B

254 SMO Austenitic Grade

Alloy 254 SMO is a high-end austenitic stainless steel with higher molybdenum and nitrogen with lower carbon content. This alloy combines strength nearly twice the level of the 300 series stainless and outstanding resistance to pitting, stress corrosion cracking, and crevice corrosion. In some instances, 254 SMO is a better and more cost effective solution than high nickel or titanium alloys. This alloy is frequently used in high chloride and marine environments.

APPLICATIONS:

Chemical and Food Processing
Petroleum production and Oil & Gas
Saltwater and Marine applications
Desalination processes

CHEMICAL COMPOSITION:

Carbon :                  0.02 max
Chromium :            19.5 – 20.0
Nickel :                    17.5 – 18.5
Manganese :          1.0 max
Silicon :                   0.80 max
Nitrogen :               0.18 – 0.22
Phosphorus :         0.03 max
Molybdenum :       6.0 – 6.5

MECHANICAL PROPERTIES:

Yield Strength :     45 KSI min
Tensile Strength : 95 KSI min
Elongation :           35%
Hardness :             96 Rockwell B