What is SA 193 Gr B7?
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 ASTM B7?
ASTM A193 B7 is a Bolting specification for medium-high temperature applications. It is a heat treated Chromium Molybdenum steel and is considered for applications up to 450° Celsius (840° Fahrenheit).
What is a Grade B7 bolt?
Grade B7 is the most common grade of A193 bolts used in construction. These bolts are typically bought and sold in a plain, bare metal finish but are often hot-dip galvanized, zinc plated, Xylan coated, PTFE coated, or otherwise coated for corrosion resistance.
Is ASTM A193 Grade 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 2 Stainless steel, AISI 304, carbide solution treated, strain hardened |
Is B7 better than Grade 8?
The multiple heat treat process used to hardened Grade B7 bolts is designed to provide an excellent strength to toughness ratio for commercially available cap screws. Grade B7 provides higher strength than Grade 5 bolts with greater ductility than Grade 8.
What is Grade B7 steel?
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.
Is B7 carbon steel?
ASTM A193 Grade B7M studs are identical in chemistry to Grade B7, as they are quenched and tempered carbon steel to achieve a lower hardness.
When to use sa 194 grade 7 NUTS?
The SA 194 Grade 7 Nuts designed according to this specification are intended to be used for high pressure and/or high temperature applications. Hence, grade 410 ASTM A194 Grade 7 Nuts are used in applications involving industries where they are exposed to corrosive media such as chemicals, food, mild acids, water, and air.
What kind of grinding material is ASME SA 194?
The ASME SA 194 material also covers austenitic grade stainless steel nuts in the size range 1⁄4 inches and above. The material ASTM A194 gr 7 nuts can further be processed by centerless grinding as well as by cold drawing.
What is the hardness of A194 grade 7 NUTS?
The Rockwell hardness value of the ASTM A194 Grade 7 Nuts is a minimum of C24 and a maximum of C38, while its Brinell hardness ranges between 248 – 327. A194 Grade 7: 410 Stainless Steel, Quenched and Tempered.. * This is the diameter across the flats.
When to use ASTM A193 B7 grade bolts?
The ASTM A193 Gr B7 Bolts are used in chemical, acid production, food processing equipment and other sensitive and high corrosive applications. The ASTM A193 B7 Metric Bolts are made under metric dimensions, There are ASTM, ASME, AISI and other international standards governing the dimensions of the fasteners.