ASTM A193 Grade B7m Bolt, Nuts, Washers Manufacturer in India
Ultimate Guide to ASTM A193
Grade B7M Fasteners
ASTM A193 Grade B7m and Grade B7 are chromium-molybdenum alloy steel bolting material specifications intended for high-temperature and high-pressure service. While they share the same base chemical composition, they undergo different heat treatments to serve distinct industrial environments. For full industry standard compliance, refer to official ASTM International Standards.
Grade B7 is the industry standard for high-temperature applications, offering high tensile strength up to 125 ksi. ASTM A193 Grade B7m, however, is tempered at a higher temperature to yield a lower hardness (maximum 235 HBW) and lower tensile strength. This specific processing makes ASTM A193 Grade B7m bolts highly resistant to stress corrosion cracking (SCC) and hydrogen embrittlement, making them essential for sour gas (H₂S) conditions.
Ananka Group is a trusted manufacturer of both fastener grades. Whether you require standard B7 bolts or ASTM A193 Grade B7m fasteners paired with ASTM A194 Grade 2HM Nuts for pressure vessels, flanges, and aggressive petrochemical or offshore applications, our products deliver ultimate safety and reliability.
About ASTM A193 Grade B7m & Grade B7 Fasteners
ASTM A193 Grade B7m Fasteners and Grade B7 fasteners are defined by their rigorous control over mechanical properties. Standard Grade B7 is a high-strength bolt (up to 321 HBW) preferred for standard high-pressure, high-temperature (HPHT) pipeline and flange setups. Conversely, by keeping hardness levels to a maximum of 235 HBW, ASTM A193 Grade B7m drastically reduces the risk of hydrogen embrittlement that prevails in wet, sour, or highly corrosive environments. Together, these two grades cover the full spectrum of heavy-duty oil, gas, and structural applications.
ASTM A193 Grade B7m Fasteners Exporter
ASTM A193 Grade B7m Fasteners Manufacturers
ASTM A193 Grade B7m & Grade B7 Fasteners Specification
- Specifications: ASTM A193 Grade B7m / ASME SA193
- Standard: DIN, ASTM, BS, ISO and all International Standards
- Material Grade: Chromium-Molybdenum Alloy Steel (AISI 4140 / 4142)
- Size Range: M6 to M100 | 1/4" to 4" | Custom Sizes
- Fastener Types: ASTM A193 Grade B7m Hex Head Bolts, Heavy Hex Bolts, Stud Bolts, U-Bolts, Anchor Bolts, Socket Head Cap Screws, Machine Screws, Hex Nuts, Lock Nuts, Washers.
Chemical Composition Of ASTM A193 Grade B7m & B7
| Element | Percentage |
|---|---|
| Carbon (C) | 0.37 - 0.49 |
| Manganese (Mn) | 0.65 - 1.10 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.040 max |
| Silicon (Si) | 0.15 - 0.35 |
| Chromium (Cr) | 0.75 - 1.20 |
| Molybdenum (Mo) | 0.15 - 0.25 |
Mechanical Properties Of ASTM A193 Grade B7m & B7
| Grade | Diameter (inch) | Tensile Strength (min, ksi) | Yield Strength (min, ksi) | Elongation (min, %) | Reduction of Area (min, %) | Hardness (max) |
|---|---|---|---|---|---|---|
| B7 | 2-1/2 and under | 125 | 105 | 16 | 50 | 321 HBW or 35 HRC |
| B7 | Over 2-1/2 to 4 | 115 | 95 | 16 | 50 | 321 HBW or 35 HRC |
| ASTM A193 Grade B7m | 4 and under | 100 | 80 | 18 | 50 | 235 HBW or 99 HRB |
| ASTM A193 Grade B7m | Over 4 to 7, inclusive | 100 | 75 | 18 | 50 | 235 HBW or 99 HRB |
ASTM A193 Grade B7m Applications
- 🛢️Oil & Gas (Standard & Sour Gas / H₂S conditions)
- ⛽Petrochemical Plants & Refineries
- 🚢Offshore Platforms & Marine applications
- 🔥High-Pressure, High-Temperature (HPHT)
- 🗜️Valves, Flanges, and Pressure Vessels
- ⚙️Heat Exchangers & Boilers
ASTM A193 Grade B7m Fasteners Packaging and Delivery
LC (Letter of Credit), TT (Telegraphic Transfer or Wire Transfer), Cheque and others.
ASTM A193 Grade B7m Fasteners are packaged with caution and safety so they reach our clients in optimal condition. Packaging Charges Extra.
Mumbai or Kalamboli ports in the Maharashtra state of India.
18% GST