A193 / A193M
ASTM A193/A193M is a specification from the ASTM International that primarily govern industrial piping applications. In the assembly of an industrial plant, many complex components are bolted together of which include parts such as valves, piping, and pressure vessels. ASTM A193 defines the methodology to procure and certify externally threaded fasteners according to specific chemical and mechanical criteria. It is standards such as this that allow industrial process applications to be safely engineered so they do not exceed the tensile strength of the fasteners that hold them together.
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ASTM A193 Grade B7 Specification
ASTM A193 Grade B7 specification covers requirements for high tensile alloy steel bolting material for use in high temperature or high-pressure service and other special purpose applications. It is a standard specification defining typical chemical composition, mechanical properties, hardness requirement, preferential heat treatment, product marking, certification and other requirements, suitable for bolting used in pressure vessel service, valves, flanges and fittings. ASTM A193 defines both SI (Metric) and inch-pound units.
Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC. Boltport uses Alloy Steel AISI 4140 bar stock or forging stock to produce B7 headed and non-headed bolts. A193 Grade B7 is the most commonly used Bolt specification coupled with A194 Grade 2H Nuts for Bolting Carbon Steel pipeline. A193 B7 bolting is available in metric sizes from M6 to M180 and imperial sizes from 1/4 to 7 inches, in diameter.
Find information on ASTM A193 Grade B7 chemical composition, mechanical properties such as tensile strength; yield strength, hardness, marking requirements and reference product standards.
Material grades that are governed under ASTM A193 include:
Ferritic steels
Grade: UNS designation[clarification needed]
B5 5% Chromium
B6 12% Chromium
B6X S 41000
B7 Chromium-molybdenum steel
B7M Chromium-molybdenum
B16 Chromium-molybdenum-vanadium steel
Austenitic steels
Grade: UNS designation
B8 S 30400 (304)
B8A S 30400 (304)
B8C S 34700 (347)
B8CA S 34700 (347)
B8M S 31600 (316)
B8MA S 31600 (316)
B8M2 S 31600 (316)
B83 S 31600 (316)
B8P S 30500
B8PA S 30500
B8N S 30451 (304N)
B8NA S 30451 (304N)
B8MN S 31651 (316N)
B8MNA S 31651 (316N)
B8MLCuN S 31254
B8MLCuNA S 31254
B8T S 32100 (321)
B8TA S 32100 (321)
B8R S 20910
B8RA S 20910
B8S S 21800
B8SA S 21800
B8LN S 30453
B8LNA S30453
B8MLN S 31653
B8MLNA S 31653
| Diameter mm | Min Tempering Temperature, °C | Tensile Strength min, MPa | Yield strength, min, 0.2% offset, MPa | Elongation in 4D min, % | Reduction of Area, min, % | Hardness, max |
| M64 and Under | 593 | 860 | 720 | 16 | 50 | 321 HBW or 35 HRC |
| over M64 to M100 | 593 | 795 | 655 | 16 | 50 | 321 HBW or 35 HRC |
| over M100 to M180 | 593 | 690 | 515 | 18 | 50 | 321 HBW or 35 HRC |
| Diameter Inch | Min Tempering Temperature, °C | Tensile Strength min, ksi | Yield strength, min, 0.2% offset, ksi | Elongation in 4D min, % | Reduction of Area, min, % | Hardness, max |
| 2.5 and under | 1100 | 125 | 105 | 16 | 50 | 321 HBW or 35 HRC |
| over 2.5 to 4 | 1100 | 115 | 95 | 16 | 50 | 321 HBW or 35 HRC |
| over 4 to 7 | 1100 | 100 | 75 | 18 | 50 | 321 HBW or 35 HRC |
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