What is ASTM A193 Gr B7?
What is ASTM A193 Gr B7?
ASTM A193 Grade B7 bolts and threaded studs are manufactured from a chromium-molybdenum steel and are quenched and tempered (heat treated) to develop the desired mechanical properties (strength). Grade B7 is the most common grade of A193 bolts used in construction.
What are B7 bolts used for?
Grade B7 Stud Bolts are used in pressure vessels that do not need corrosion resistance, aren’t susceptible to stress corrosion cracking, and for temperatures typically less than 750F. However, these bolts can have many different types of finishes, including: plain finish for standard applications.
What is the tensile strength of a B7 bolt?
125,000 PSI
Grade 8
| GRADE | ASTM A193 B7 (Chromium Molybdenum) | GRADE 8 (Heat Treated After Threading) |
|---|---|---|
| TENSILE STRENGTH | 125,000 PSI minimum 1,100°F tempering temp | 150,000 PSI minimum |
| YIELD STRENGTH | 105,000 PSI minimum minimum | 130,000 PSI minimum |
| ROCKWELL HARDNESS | C26-C32 | C33-C39 |
Is ASTM A193 B7 stainless steel?
The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high-pressure service….A193 Grades.
| B7 | Alloy steel, AISI 4140/4142 quenched and tempered |
|---|---|
| B8 | Class 1 Stainless steel, AISI 304, carbide solution treated. |
What is B7 bolt material?
Grade B7 is a heat-treated chromium-molybdenum alloy steel with minimum tensile requirement of 100 ksi, yield of 75 ksi and maximum hardness of 35 HRC. ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment, recommended nuts-washers for Grade B7 fasteners.
How strong is B7 alloy steel?
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.
How strong is B7?
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.
How hard is a B7 bolt?
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.
What is the standard thread series for A193 bolts?
What is the standard thread series for A193 bolts? Unlike most other ASTM specifications covering construction fasteners, the A193 specification requires 8 threads per inch for bolts larger than 1″ diameter.
What is bolt grade B7?
B7 Bolts. The B7 grade bolts are a heat treated chromium-molybdenum steel. This grade of bolt is commonly used for fastening of medium high temperature service materials.
What are B7 studs?
B7 studs are cut-to-length all-thread rod, and common applications include: bolting flanges together, anchor bolting, and general fastening. The specifications for B7 studs are governed by ASTM A193, and the material used for B7 studs is a Chrome-moly alloy steel that is quenched and tempered.
