ASTM A193 Grades
B7 - Alloy steel, AISI 4140/4142 quenched and tempered
B8 - Class 1 Stainless steel, AISI 304, carbide solution treated.
B8M - Class 1 Stainless steel, AISI 316, carbide solution treated.
B8 - Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
B8M - Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened
| A193 Mechanical Properties | |||||||
|---|---|---|---|---|---|---|---|
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min | HBW | Rockwell |
| B7 | Up to 2-1/2" | 125 | 105 | 16 | 50 | 321 max | 5 HRC max |
| 2-5/8" to 4" | 115 | 95 | 16 | 50 | |||
| 4-1/8" to 7" | 100 | 75 | 18 | 50 | |||
| B8 Class 1 | All | 75 | 30 | 30 | 50 | 223 max | 6 HRB max |
| B8M Class 1 | All | 75 | 30 | 30 | 50 | 223 max | 6 HRB max |
| B8 Class 2 | 3/4" and under | 125 | 100 | 12 | 35 | 321 max | 5 HRC max |
| 7/8" to 1" | 115 | 80 | 15 | 35 | |||
| 1-1/8" to 1-1/4" | 105 | 65 | 20 | 35 | |||
| 1-3/8" to 1-1/2" | 100 | 50 | 28 | 45 | |||
| B8M Class 2 | 3/4" and under | 110 | 95 | 15 | 45 | 321 max | 5 HRC max |
| 7/8" to 1" | 100 | 80 | 20 | 45 | |||
| 1-1/8" to 1-1/4" | 95 | 65 | 25 | 45 | |||
| 1-3/8" to 1-1/2" | 90 | 50 | 30 | 45 | |||
| A193 Chemical Properties | |||
|---|---|---|---|
| Element | B7 (AISI 4140) | B8 (AISI 304) | B8M (AISI 316) |
| Carbon | 0.38 - 0.48% | 0.08% max | 0.08% max |
| Manganese | 0.75 - 1.00% | 2.00% max | 2.00% max |
| Phosphorus, max | 0.04% | 0.05% | 0.05% |
| Sulfur, max | 0.04% | 0.03% | 0.03% |
| Silicon | 0.15 - 0.35% | 1.00% max | 1.00% max |
| Chromium | 0.80 - 1.10% | 18.0 - 20.0% | 16.0 - 18.0% |
| Nickel | 8.0 - 11.0% | 10.0 - 14.0% | |
| Molybdenum | 0.15 - 0.25% | 2.00 - 3.00% | |
This abridged table shows only the chemical requirements for bars. The complete table including shapes and plates can be found in the ASTM standard at www.astm.org
All information derived from globally recognized specifications, subject to change, user discretion is advised.
