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Ningbo Alloy Steel Bolt
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Product : Alloy Steel Bolt
Standard: Ningbo API 20E BSL 2
Surface Treatment: Zinc Plated Yellow
Thread: 8 UNC
Dimension: 1-7/8 IN
Length: 160 mm
Material: ASTM A193 B7
Standard: Ningbo API 20E BSL 2
Surface Treatment: Zinc Plated Yellow
Thread: 8 UNC
Dimension: 1-7/8 IN
Length: 160 mm
Material: ASTM A193 B7
Quantity
Our high-performance Alloy Steel Bolt is precision-engineered to meet the rigorous requirements of API 20E Bolting Specification Level 2 (BSL-2), a critical standard for bolting used in the petroleum and natural gas industries . Manufactured from ASTM A193 Grade B7 chromium-molybdenum alloy steel, this bolt delivers exceptional strength, durability, and resistance to high-temperature and high-pressure service conditions .
Material & Mechanical Properties
The ASTM A193 B7 material is the industry workhorse for high-temperature bolting applications. Quenched and tempered to achieve optimal mechanical properties, this alloy steel offers a minimum tensile strength of 125 ksi and yield strength of 105 ksi for diameters up to 2-1/2 inches . The chromium-molybdenum composition (AISI 4140/4142) provides excellent hardenability and maintains structural integrity at continuous service temperatures up to 450°C (840°F) .
The ASTM A193 B7 material is the industry workhorse for high-temperature bolting applications. Quenched and tempered to achieve optimal mechanical properties, this alloy steel offers a minimum tensile strength of 125 ksi and yield strength of 105 ksi for diameters up to 2-1/2 inches . The chromium-molybdenum composition (AISI 4140/4142) provides excellent hardenability and maintains structural integrity at continuous service temperatures up to 450°C (840°F) .
API 20E BSL-2 Compliance
API 20E BSL-2 certification ensures enhanced manufacturing controls, including qualified heat treatment procedures, increased mechanical testing frequency, non-destructive examination (NDE) such as magnetic particle testing, and full lot-by-lot traceability . This makes our Alloy Steel Bolt suitable for moderately critical service applications where bolting failure would cause significant equipment damage or safety risks .
API 20E BSL-2 certification ensures enhanced manufacturing controls, including qualified heat treatment procedures, increased mechanical testing frequency, non-destructive examination (NDE) such as magnetic particle testing, and full lot-by-lot traceability . This makes our Alloy Steel Bolt suitable for moderately critical service applications where bolting failure would cause significant equipment damage or safety risks .
Surface Treatment & Thread Specifications
The bolt features a distinctive yellow zinc-plated finish, which studies have shown provides superior corrosion resistance compared to clear chromate zinc coatings, particularly in high-moisture and polluted environments . This coating enhances both corrosion protection and visibility for easy identification during installation and maintenance. The 8 UNC thread pattern—specified for diameters one inch and above per ASTM A193 standards—ensures a tight, reliable connection with optimal stress distribution . Measuring 1-7/8 inches in diameter and 160mm in length, this bolt is designed to meet diverse flange connection requirements.
The bolt features a distinctive yellow zinc-plated finish, which studies have shown provides superior corrosion resistance compared to clear chromate zinc coatings, particularly in high-moisture and polluted environments . This coating enhances both corrosion protection and visibility for easy identification during installation and maintenance. The 8 UNC thread pattern—specified for diameters one inch and above per ASTM A193 standards—ensures a tight, reliable connection with optimal stress distribution . Measuring 1-7/8 inches in diameter and 160mm in length, this bolt is designed to meet diverse flange connection requirements.
Application Scenarios
This Alloy Steel Bolt is ideal for critical oil and gas applications, including wellhead assemblies, Christmas trees, API valve flange connections, pressure vessels, and high-pressure piping systems . It is commonly specified for carbon steel piping systems across ASME pressure classes 150 to 2500, steam systems, and hydrocarbon service environments .
This Alloy Steel Bolt is ideal for critical oil and gas applications, including wellhead assemblies, Christmas trees, API valve flange connections, pressure vessels, and high-pressure piping systems . It is commonly specified for carbon steel piping systems across ASME pressure classes 150 to 2500, steam systems, and hydrocarbon service environments .
Quality Assurance
Each bolt is supplied with full traceability documentation, including chemical analysis, tensile testing, hardness verification, and dimensional inspection reports, ensuring compliance with API 20E BSL-2 and EN 10204 3.1 certification requirements .
Each bolt is supplied with full traceability documentation, including chemical analysis, tensile testing, hardness verification, and dimensional inspection reports, ensuring compliance with API 20E BSL-2 and EN 10204 3.1 certification requirements .
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