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ASTM A193
Scope
Originally approved in 1936, this specification is heavily utilized in petroleum and chemical construction applications. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other standard specifications not covered in this description including B5, B6, and B16.
A193 Grades
B7 | Alloy steel, AISI 4140/4142 quenched and tempered |
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B8 | Class 1 Stainless steel, AISI 304, carbide solution treated. |
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B8M | Class 1 Stainless steel, AISI 316, carbide solution treated. |
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B8 | Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened |
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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 |
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 Class 2 | 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 |
A193 Chemical Properties
Element |
B7 (AISI 4140) |
B8 (AISI 304) |
B8M (AISI 316) |
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Carbon | 0.37 - 0.49% | 0.08% max | 0.08% max |
Manganese | 0.65 - 1.10% | 2.00% max | 2.00% max |
Phosphorus, max | 0.035% | 0.045% | 0.045% |
Sulfur, max | 0.040% | 0.030% | 0.030% |
Silicon | 0.15 - 0.35% | 1.00% max | 1.00% max |
Chromium | 0.75 - 1.20% | 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% |
A193 Recommended Hardware
Bolt 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 |
A193 | - Alloy steel and stainless steel bolting materials for high temperature or high pressure service. |
A307 |
- - Carbon steel bolts and studs, 60,000 psi tensile strength.
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A320 |
- - Alloy steel and stainless steel bolting materials for low temperature service.
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A325 |
- - Structural bolts, steel, heat treated, 120/105 ksi minimum tensile strength.
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A354 |
- - Quenched and tempered alloy bolts, studs, and other externally threaded fasteners.
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A449 |
- - Quenched and tempered steel bolts and studs for general use.
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A453 |
- - High temperature Bolting with expansion co-efficient comparable to Austenitic Stainless Steel
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A490 |
- - Structural bolts, alloy steel, heat treated, 150 ksi minimum tensile strength.
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F568 | - Standard for metric bolts, screws and studs that are used in general engineering applications |
F593 |
- - Stainless steel bolts, hex cap screws, and studs.
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F1554 |
- - Anchor bolts designed to anchor structural supports to concrete foundations.
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