ASTM-A193 Mechanical Properties

ASTM-A193 Mechanical Properties / A193M

This specification covers ASTM-A193 Mechanical Properties for inch and metric size alloy and stainless steel bolting material for pressure vessels, valves, flanges, and fittings for high temperature service.  The term bolting used in this specification includes bars, bolts, hex bolts, hex head cap screws, screws, studs, stud bolts, and wires.  Although A193 fastener grades are available in UNC (unified national course) and UNF (unified fine) thread pitch, it is common to find sizes 1″ and larger in “8 thread” (8 TPI – threads per inch).

ASTM-A193 / A193M CHEMICAL PROPERTIES

 

ASTM-A193 / A193M MECHANICAL REQUIREMENTS

Grade and Class Diameter Tensile Strength Min KSI Yield Strength 0.2% Offset KSI Elongation in 4D, Min, % Reduction of Area Min, % Hardness Max Brinell Hardness Max Rockwell
B5 up to 4″ incl 100 80 16 50
B6 up to 4″ incl 110 85 15 50
B6X up to 4″ incl 90 70 16 50 C26
B7 to 2-1/2″ 125 105 16 50 C35
over 2-1/2 to 4″ 115 95 16 50 C35
over 4″ to 7″ 100 75 18 50 C35
B7M up to 4″ incl 100 80 18 50 235 B99
over 4″ to 7″ 100 75 18 50 235 B99
B16 to 2-1/2″ 125 105 18 50 321 C35
over 2-1/2″ to 4″ 110 95 17 45 321 C35
over 4″ to 7″ 100 85 16 45 321 C35
Classes 1 and 1D: B8, B8M, B8P, B8LN, B8ML ALL 75 30 30 50 223 B96
Class 1: B8C, B8T ALL 75 30 30 50 223 B96
Class 1A: B8A, B8CA, B8MA, B8PA, B8TA, B8LNA, B8MLNA, B8NA, B8MNA, B8MLCuNA ALL 75 30 30 50 192 B90
Classes 1B & 1D: B8N, B8MN, B8MLCuN ALL 80 35 30 40 223 B96
Class 1C and 1D: B8R ALL 100 55 35 55 271 C28
Class 1C: B8RA ALL 100 55 35 55 271 C28
Classes 1C and 1D: B8S ALL 95 50 35 55 271 C28
Classes 1C: B8SA ALL 95 50 35 55 271 C28
Class 2: B8, B8C, B8P, B8T, B8N to 3/4″ 125 100 12 35 321 C35
over 3/4″ to 1″ 115 80 15 35 321 C35
over 1″ to 1-1/4″ 105 65 20 45 321 C35
over 1-1/4 to 1-1/2″ incl 100 50 28 45 321 C35
Class 2 B8M, B8MN, B8MLCuN to 3/4″ 110 96 15 45 321 C35
over 3/4″ to 1″ 100 80 20 45 321 C35
over 1″ to 1-1/4″ 95 65 25 45 321 C35
over 1-1/4 to 1-1/2″ incl 90 50 30 45 321 C35
Class 2B: B8, B8M2 to 2″ incl 95 75 25 40 321 C35
over 2″ to 2-1/2″ incl 90 65 30 40 321 C35
over 2-1/2 ” to 3″ incl 80 55 30 40 321 C35
Class 2C: B8M3 to 2″ incl 85 65 30 60 321 C35
over2″ 85 60 30 60 321 C35

 

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Lightning Bolt & Supply, INc

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