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ASTM A193 material was originally approved in 1936. This Specification is heavily used in petroleum fields and in chemical products applications. The ASTM Standard covers the steel and stainless steel alloys suitable for the fastening of high temperatures materials and also includes the fastening specifications to be used in pressure vessels, valves, flanges and fittings. ASTM A193 B7 Carbon alloy steel, AISI 4140/4142 quenched and tempered ASTM A193 B16 CrMoVa alloy steel quenched and tempered
ASTM A193 B8 Class 1 Stainless steel, AISI 304, carbide solution treated.
ASTM A193 B8M Class 1 Stainless steel, AISI 316, carbide solution treated.
ASTM A193 B8 Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
ASTM A193 B8M Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened ASTM A193 B8T in acciaio inox AISI 321 ASTM A193 B8C in acciaio inox AISI 347 ASTM A193 B6 in acciaio inox AISI410
>> MECHANICAL PROPERTIES ASTM A193
| Grade | Size
| Tensile, Ksi, Min
| Yield, ksi, min | Elong, %, min | RA % min | B7
| up to 2-1/2
| 125 | 105 | 16 | 50
| 2-5/8 - 4
| 115 | 95 | 16 | 50 | 4-1/8 - 7
| 100 | 75 | 18 | 50 | | B8 Class 1 | all | 75 | 30 | 30 | 50 | B8M Class 1
| all | 75 | 30 | 30 | 50 | | B8 Class2 | Up to 3/4 | 125 | 100 | 12 | 35 | | 7/8 - 1 | 115 | 80 | 15 | 35 | | 1-1/8 - 1-1/4 | 105 | 65 | 20 | 35 | | 1-3/8 - 1-1/2 | 100 | 50 | 28 | 45 | B8M Class 2
| Up to 3/4 | 110 | 95 | 15 | 45 | 7/8 - 1
| 100 | 80 | 20 | 45 | | 1-1/8 - 1-1/4 | 95 | 65 | 25 | 45 | | 1-3/8 - 1-1/2 | 90 | 50 | 30 | 45 |
>> RECOMMENDED NUTS and WASHERS | Grade | Nuts | Washers | | B7 | A194 Grade 2H
| F436 | B8 Class 1
| A194 Grade 8
| SS304 | B8M Class 1
| A194 Grade 8M
| SS316 | B8 Class 2
| A194 Grade 8 | SS304 | B8M Class 2
| A194 Grade 8M
| SS316 |
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