API 20E BSL1 BSL2 ASTM A193 B7 Stud Bolt Xylan 1070 Coated
API 20E compliant ASTM A193 Grade B7 stud bolts with Xylan 1070 coating are designed for critical bolted flange connections in oil & gas, petrochemical, and energy industries.
These stud bolts combine high-strength alloy steel, advanced fluoropolymer coating, and API 20E quality management requirements, ensuring reliability, traceability, and consistent performance in harsh service environments.
Available in API BSL1 and BSL2, Xylan 1070 coated A193 B7 stud bolts are suitable for both standard and critical pressure applications where corrosion protection and controlled preload are essential.
What Is ASTM A193 B7?
ASTM A193 is a standard specification covering alloy and stainless steel bolting materials for high-temperature and high-pressure service.
Grade B7 is a quenched and tempered chromium-molybdenum alloy steel widely used for stud bolts in pressure piping and flange connections.
Key characteristics of ASTM A193 B7:
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High tensile and yield strength
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Excellent performance at elevated temperatures
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Widely accepted in oil, gas, and petrochemical standards
API 20E Compliance – BSL1 & BSL2
API 20E specifies requirements for the qualification, production, and documentation of bolting materials used in the petroleum and natural gas industries.
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BSL1: Standard quality level with defined manufacturing and inspection controls
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BSL2: Enhanced quality level with additional testing, traceability, and process control
API 20E compliance ensures:
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Full material traceability
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Controlled heat treatment
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Documented manufacturing records
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Improved reliability in critical service applications
Chemical Composition – ASTM A193 B7 (Typical)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.37 – 0.49 |
| Chromium (Cr) | 0.75 – 1.20 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Manganese (Mn) | 0.65 – 1.10 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
Mechanical Properties – ASTM A193 B7
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 860 MPa |
| Yield Strength | ≥ 720 MPa |
| Elongation | ≥ 16% |
| Reduction of Area | ≥ 50% |
Stud Bolt Specifications
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Material: ASTM A193 Grade B7
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Standard: ASTM A193 / API 20E
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Quality Level: BSL1 / BSL2
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Coating: Xylan 1070
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Thread Type: UNC / UNF / 8UN
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Size Range: 1/2″ – 4″ (metric sizes available on request)
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Length: As per ASME B16.5 / ASME B16.47 or project requirement
Inspection & Testing
API 20E BSL1 / BSL2 Xylan 1070 coated stud bolts are supplied with full inspection and testing, including:
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Chemical composition analysis
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Mechanical property testing
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Hardness testing
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Dimensional and thread inspection
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Coating thickness and adhesion testing
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Full API 20E documentation and traceability
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Certification: EN 10204 3.1
API 20E BSL1 / BSL2 ASTM A193 B7 stud bolts with Xylan 1070 coating provide a proven bolting solution for pressure-critical and corrosive service applications.
With enhanced corrosion resistance, controlled friction performance, and strict API 20E quality assurance, these stud bolts ensure safe and reliable flange connections in demanding oil & gas projects.
Xylan 1070 Coated Stud Bolt API 20E BSL1 BSL2 ASTM A193 B7
Recommended Related Products
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ASTM A193 B7 / B7M Stud Bolts
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ASTM A320 L7 / L7M Stud Bolts
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ASTM A194 2H / 2HM Heavy Hex Nuts
