ASTM A193 Gr B7 Bolts: Versatile, Durable, and Cost-Effective
ASTM A193 Gr B7 Carbon Steel Bolts are widely recognized for their high strength, durability, and reliability, making them essential components in industries like petrochemicals, construction, oil and gas, and power generation. These bolts, manufactured from high-quality carbon steel, are specifically designed to withstand high-pressure and high-temperature environments.
In this article, we will delve into the properties, advantages, applications, and key aspects of ASTM A193 Gr B7 Bolts. We will also address frequently asked questions, such as “What is ASTM A193 Carbon Steel Gr B7 Bolts?” and discuss the role of exporters and suppliers of A193 Carbon Steel Gr B7 Bolts.
What is ASTM A193 Carbon Steel Gr B7 Bolts?
ASTM A193 Gr B7 Carbon Steel Bolts are fasteners made from medium carbon steel, specifically alloyed to withstand high-temperature and high-pressure conditions. The “Gr B7” designation refers to the mechanical properties and chemical composition that these bolts must meet, as specified by the ASTM A193 standard. The ASTM A193 standard covers bolts, studs, and threaded fasteners used in pressure vessels, valves, flanges, and other high-stress applications.
These bolts are typically quenched and tempered to enhance their strength and resistance to corrosion and temperature fluctuations, making them suitable for use in harsh environments.
Properties of ASTM A193 Carbon Steel Gr B7 Bolts
The ASTM A193 CS Gr B7 Bolts possess remarkable mechanical and physical properties that make them the preferred choice for demanding applications. Below are the key properties of these bolts:
- High Tensile Strength: The tensile strength of ASTM A193 Gr B7 Bolts ranges from 860 MPa to 1100 MPa, allowing them to withstand significant stress without deformation or failure.
- Yield Strength: The yield strength of these bolts is typically around 725 MPa, ensuring they retain their shape and integrity even under heavy loads.
- Hardness: The quenching and tempering process gives these bolts a hardness of around 99 HRB, providing enhanced resistance to wear and tear.
- Temperature Resistance: ASTM A193 Gr B7 Bolts are designed to perform exceptionally well at temperatures up to 450°C (842°F), making them suitable for high-temperature environments.
- Corrosion Resistance: While primarily made from carbon steel, the addition of chromium and molybdenum offers moderate resistance to corrosion, making these bolts durable in mildly corrosive environments.
- Versatility: These bolts are available in various sizes, lengths, and finishes, such as plain, galvanized, or zinc-coated, to meet specific application requirements.
Advantages of ASTM A193 Carbon Steel Gr B7 Bolts
Using ASTM A193 Carbon Steel Gr B7 Bolts offers several advantages, particularly in industries where strength, durability, and temperature resistance are critical. Here are the key benefits:
- High Strength in Extreme Conditions: The robust tensile and yield strength make these bolts ideal for use in high-pressure and high-temperature applications, such as in boilers, pressure vessels, and flanges.
- Temperature Stability: Carbon Steel Gr B7 ASTM A193 Bolts maintain their mechanical integrity even at elevated temperatures, ensuring reliable performance over long periods in challenging environments.
- Corrosion and Wear Resistance: While not entirely immune to corrosion, the alloying elements in these bolts give them moderate resistance to rust and oxidation, extending their service life in environments with moisture or chemicals.
- Cost-Effective Solution: Compared to stainless steel or other high-performance alloys, ASTM A193 CS Gr B7 Bolts offer an economical solution for many industrial applications without compromising on strength or reliability.
- Compliance with Industry Standards: As these bolts adhere to the ASTM A193 standard, they meet strict requirements for mechanical properties, chemical composition, and manufacturing processes, ensuring high-quality performance in critical applications.
Schedule and Size Chart
| Nominal Size (inches) | Threads Per Inch (TPI) | Diameter (mm) | Length (inches) | Pitch (mm) |
| 1/4″ | 20 | 6.35 | 1 – 12 | 1.27 |
| 5/16″ | 18 | 7.94 | 1 – 12 | 1.41 |
| 3/8″ | 16 | 9.53 | 1 – 12 | 1.59 |
| 1/2″ | 13 | 12.70 | 1 – 36 | 1.95 |
| 5/8″ | 11 | 15.88 | 1 – 36 | 2.31 |
| 3/4″ | 10 | 19.05 | 1 – 48 | 2.54 |
| 1″ | 8 | 25.40 | 1 – 72 | 3.18 |
| 1-1/4″ | 7 | 31.75 | 1 – 72 | 3.62 |
Specifications Chart
| Specification | ASTM A193 Gr B7 Bolt Description |
| Standard | ASTM A193 |
| Grade | B7 |
| Material | Medium Carbon Steel, Alloy Steel |
| Heat Treatment | Quenched and Tempered |
| Size Range | 1/4″ – 4″ Diameter |
| Threads | Coarse (UNC) or Fine (UNF) |
| Finish | Plain, Galvanized, Zinc-Coated |
Mechanical Properties Chart
| Property | ASTM A193 Gr B7 Bolt Value |
| Tensile Strength | 860 – 1100 MPa (125,000 – 160,000 psi) |
| Yield Strength | 725 MPa (105,000 psi) |
| Hardness (Brinell) | 321 max. |
| Hardness (Rockwell C) | 35 max. |
| Elongation | 16% (minimum) |
| Reduction of Area | 50% (minimum) |
Specifications Chart
| Specification | ASTM A193 Gr B7 Bolt Description |
| Standard | ASTM A193 |
| Grade | B7 |
| Material | Medium Carbon Steel, Alloy Steel |
| Heat Treatment | Quenched and Tempered |
| Size Range | 1/4″ – 4″ Diameter |
| Threads | Coarse (UNC) or Fine (UNF) |
| Finish | Plain, Galvanized, Zinc-Coated |
Chemical Composition Chart
| Element | Percentage Composition |
| Carbon (C) | 0.37 – 0.49% |
| Manganese (Mn) | 0.65 – 1.10% |
| Phosphorus (P) | Max 0.035% |
| Sulfur (S) | Max 0.040% |
| Silicon (Si) | 0.15 – 0.35% |
| Chromium (Cr) | 0.75 – 1.20% |
| Molybdenum (Mo) | 0.15 – 0.25% |
Physical Properties Chart
| Property | Value |
| Density | 7.85 g/cm³ |
| Melting Point | 1425 – 1530°C (2600 – 2790°F) |
| Modulus of Elasticity | 205 GPa (29,700 ksi) |
| Thermal Conductivity | 47 W/m·K |
| Specific Heat Capacity | 486 J/kg·K (at 25°C) |
| Coefficient of Thermal Expansion | 11.7 µm/m°C |
Application Chart
| Industry | Applications |
| Oil and Gas | Used in high-pressure pipelines, valves, pressure vessels, heat exchangers, and refineries. |
| Petrochemical | Ideal for fastening equipment and components in harsh chemical environments and elevated temperatures. |
| Power Generation | Applied in turbines, boiler assemblies, and heat exchangers where high strength is required under extreme heat. |
| Construction | Fastening structural steel, equipment, and machinery in heavy construction projects. |
| Aerospace and Defense | Used in critical fastening applications in aircraft, aerospace components, and military equipment. |
| Marine Engineering | Applied in shipbuilding and offshore platforms, where resistance to temperature and corrosion is needed. |
ASTM A193 Carbon Steel Gr B7 Bolts Exporters and Suppliers
When sourcing A193 CS Gr B7 Bolts, it is crucial to partner with reputable ASTM A193 CS Gr B7 Bolts suppliers who offer high-quality products that meet international standards. ASC LLP is a trusted supplier and exporter of ASTM A193 Gr B7 Bolts, offering a wide range of sizes and finishes to meet the specific needs of clients worldwide.
As one of the leading A193 CS Gr B7 Bolts exporters and suppliers, we ensure our products undergo strict quality control measures, from material selection to manufacturing processes, ensuring they meet the ASTM A193 standard.
Global Reach
Amardeep Steel Centre boasts a robust global presence and is committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality ASTM A193 Gr B7 Bolts. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
