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 | |