ASTM A193 Bolts
The specification for ASTM A193 covers alloy and stainless steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
Specifications
The ASTM A193 specification covers bars, bolts, screws, studs, stud bolts, and wire. The material may be further processed by centerless grinding or by cold drawing. Below are some of the ASTM A193 grades used commonly by Atlanta Rod.
- ASTM A193 B7:
- Alloy steel, AISI 4140 or 4142, quenched and tempered
- ASTM A193 B6:
- Stainless steel, AISI 410, heat treated
- 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:
- Class 1 or 2 Stainless steel, AISI 321, with additional element of Titanium
- ASTM A193 B16:
- Chromium-Molybdenum-Vanadium, similar to B7 with Vanadium added
- ASTM A193 B7M:
- Similar properties as B7 but with specialized heat treating to create differing mechanical properties
- ASTM A193 B8R:
- Stainless steel, AISI 209, also known as Nitronic 50, nitrogen strengthened
- ASTM A193 B8S:
- Stainless Steel, AISI 218, also known as Nitronic 60, nitrogen strengthened
Chemical Requirements
| Grade | Material Description |
|---|---|
| ASTM A193 B7 | Alloy steel, AISI 4140 or 4142, quenched and tempered |
| ASTM A193 B6 | Stainless steel, AISI 410, heat treated |
| 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 | Class 1 or 2 Stainless steel, AISI 321, with additional element of Titanium |
| ASTM A193 B16 | Chromium-Molybdenum-Vanadium, similar to B7 with Vanadium added |
| ASTM A193 B7M | Similar properties as B7 but with specialized heat treating to create differing mechanical properties |
| ASTM A193 B8R | Stainless steel, AISI 209, also known as Nitronic 50, nitrogen strengthened |
| ASTM A193 B8S | Stainless Steel, AISI 218, also known as Nitronic 60, nitrogen strengthened |
Mechanical Requirements
| Grade | Description | Diameter | Tensile Strength, min. | Yield Strength, min. | Hardness, max. | Marking |
|---|---|---|---|---|---|---|
| B6 | S41000 (410) | Up to 4” | 110 | 85 | B6 | |
| B7 | Chromium-Molybdenum | 2 1/2” and under | 125 | 105 | 321 HB or 35 HRC |  |
| over 2 1/2” to 4” | 115 | 95 | 321 HB or 35 HRC | |||
| over 4” to 7” | 100 | 75 | 321 HB or 35 HRC | |||
| B7M | Chromium-Molybdenum | 4” and under | 100 | 80 | 235 HB or 99 HRB | B7M |
| over 4” to 7” | 100 | 75 | 235 HB or 99 HRB | |||
| B16 | Chromium-Molybdenum- Vanadium | 2 1/2” and under | 125 | 105 | 321 HB or 35 HRC | B16 |
| over 2 1/2” to 4” | 110 | 95 | 321 HB or 35 HRC | |||
| over 4” to 8” | 100 | 85 | 321 HB or 35 HRC | |||
| B8 class 1 | S30400 (304) | all | 75 | 30 | 223 HB or 96 HRB |  |
| B8 class 2 | S30400 (304) | 3/4” and under | 125 | 100 | 321 HB or 35 HRC | B8SH |
| over 3/4” to 1” | 115 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 105 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 100 | 50 | 321 HB or 35 HRC | |||
| B8C class 1 | S34700 (347) | all | 75 | 30 | 223 HB or 96 HRB | B8C |
| B8C class 2 | S34700 (347) | 3/4” and under | 125 | 100 | 321 HB or 35 HRC | B8CSH |
| over 3/4” to 1” | 115 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 105 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 100 | 50 | 321 HB or 35 HRC | |||
| B8M class 1 | S31600 (316) | all | 75 | 30 | 223 HB or 96 HRB |  |
| B8M class 2 | S31600 (316) | 3/4” and under | 110 | 95 | 321 HB or 35 HRC | B8MSH |
| over 3/4” to 1” | 100 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 105 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 100 | 50 | 321 HB or 35 HRC | |||
| B8T class 1 | S32100 (321) | all | 75 | 30 | 223 HB or 96 HRB | B8T |
| B8T class 2 | S32100 (321) | 3/4” and under | 125 | 100 | 321 HB or 35 HRC | B8TSH |
| over 3/4” to 1” | 115 | 80 | 321 HB or 35 HRC | |||
| over 1” to 1 1/4” | 105 | 65 | 321 HB or 35 HRC | |||
| over 1 1/4” to 1 1/2” | 100 | 50 | 321 HB or 35 HRC | |||
| B8R | S20910 | all | 100 | 55 | 271 HB or 28 HRC | B8R |
| B8S | S21800 | all | 95 | 50 | 271 HB or 28 HRC | B8S |
See Also: ASTM A193 Specifications at ASTM.org.