HOT DIP GALVANIZED A193 B7M STUD BOLT MANUFACTURER
ASTM A193 B7M is a modified, lower hardness version of B7 used primarily in sour gas (H₂S) environments to prevent hydrogen embrittlement. the stud bolt of B7M grade commonly used in oil & gas, petrochemical, and refinery applications
Bolt Material Standard & Grade
- Standard: ASTM A193
- Grade: B7M
- Material: Chromium-Molybdenum Alloy Steel
- Heat treatment: Quenched & Tempered
Mechanical Properties of B7M stud bolt
| Property | ASTM A193 B7M Requirements |
|---|---|
| Tensile Strength | 100 ksi (690 MPa) min |
| Yield Strength | 80 ksi (550 MPa) min |
| Hardness | 235 HBW max (Rockwell C22 max) |
Hot-Dip Galvanizing (HDG) Details
Hot-dip galvanizing (HDG) is the process of coating fabricated steel by immersing it in a bath of molten zinc.
Hot-dip galvanizing involves dipping steel into a zinc smelter at approx. 450°C following the appropriate pre-treatment. Zinc and steel will then react with one another. An iron-zinc alloy will form on the surface of the steel. This indissoluble compound of zinc and steel creates a protection, which is clearly different from all other processes. Hot-dip galvanized surfaces are not just protected from wind and the weather but also ideally protected from mechanical exposure – for decades to come. Under normal conditions, hot-dip galvanizing will protect against corrosion for up to 50 years and generally more than 25 years in the case of higher exposure levels.
Standard: ASTM A153 / ASTM F2329
Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware
Coating Process: Zinc coating applied via hot-dip galvanization (HDG)
Coating Thickness: Typically 1.7 – 3.4 mils (43 – 86 µm)
Thread Standards & Dimensions
- Thread Type: UNC (Coarse), UNF (Fine), Metric (ISO)
- Thread Standard: ASME B1.1 (Inch), ASME B1.13M (Metric)
- Stud Bolt Dimensions: ASME B18.2.1 / B18.31.2
- Nut Compatibility: ASTM A194 Gr. 2HM (galvanized) or A563 DH (oversized tapped for HDG coating)
Applications of B7M HDG Fasterner
- Oil & Gas (Sour Gas / H₂S Environments)
- Petrochemical & Refineries
- Offshore & Marine Industry
- High-temperature & pressure applications
Typical Description of STUD BOLT A193 GR. B7M HOT DIP GALVANIZED ASTM A153
STUD BOLT +2 HEAVY NUTS, A193 GR. B7M – A194 GR. 2HM, HOT DIP GALVANIZED ACC. TO ASTM A153 (TO FLANGE 1.1/2″)
Materia:ASTM A193 GR. B7M, ASTM A194 GR. 2HM, HOT DIP GALVANIZED
ASME B1.1 (UNC <= 1″ & 8 UN =>1 1/8) ASME 18.2.2/1
1″ Size ” Length = 6 1/4″
