6“ CL150 WN Flange FF BE ASTM A182 CR.F44 (UNS S31254) ASME B16.5

6“ CL150 WN Flange FF BE ASTM A182 CR.F44 (UNS S31254) ASME B16.5

ASTM A182 F44 Stainless Bars Equivalent Grades

UNS S31254 Stainless Steel Round Bars Chemical Composition

Stainless 254SMO WERKSTOFF NR. 1.4547 Rods Mechanical Properties

What is UNS S31254? This grade of steel is a super austenitic stainless steel. They are high end stainless steel designed for impact toughness resistance to chloride crevice corrosion, stress corrosion cracking, and pitting. These are austenite with high content of nickel and chromium.

What is ASTM A240 / A240M? It is an American material standard for standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications.

Why S31254 called Alloy 254 Stainless Steel? When a material grade is specified as stainless steel, it means it has chromium content in it but this grade has high chromium content. S31254 is the UNS designation alloy, also referred as 254 alloy in SAE designation and is defined in ASTM A240 standard.

The Indicative Chemical Composition of S31254 Steels:

The chemical composition of this grade is indicated as under:

• Maximum percentage of Carbon (C) is 0.02 percent.
• Maximum percentage of Manganese (Mn) is 1.0 percent.
• Maximum percentage of Phosphorous (P) is 0.3 percent.
• Maximum percentage of Sulphur (S) is 0.01 percent.
• Minimum percentage of Chromium is 20.0 percent
• Minimum percentage of Nickel is 18.0 percent.
• Maximum percentage of Silicon (Si) is 0.7 percent.

Remaining is iron (Fe) percentage and with few negligible impurities.

Mechanical Properties of S31254 Steels:

Following are some of the mechanical properties of UNS S31254 steels:

• The tensile strength of the 254 alloy steel is expressed in Newton per millimeters and it must be at-least 600 N/mm2 (MPa).
• The elongation property of S31254 steel varies with the heat treatment process but it indicated typically 50% at break.
• S31254 is welded with filler materials like alloy 625.
• The Brinell hardness is indicated around 210.
• Corrosion resistance is higher than the other known austenitic grades.