product - ASTM A320 L7 Bolts
Introduction to ASTM A320 L7 Bolts
Standards and SURFACE TREATMENT
- ASME B18.31.1M – Metric Continuous and Double-End Studs.
- Grade L7 bolts often require surface treatment to enhance corrosion resistance in harsh environments. Common finishes include zinc plating, cadmium plating, Teflon (PTFE) coating, or hot-dip galvanizing. Baking is strictly required after electroplating to prevent hydrogen embrittlement.
Materials and practicality
- ASTM A320 Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service.
- Grade L7 bolts are specifically designed for low-temperature service. They are widely used in oil and gas pipelines, petrochemical facilities, LNG plants, and pressure vessels. Their extreme cryogenic toughness prevents brittle fracturing in severe sub-zero environments.
ASTM A320 L7 Bolts Product Data Sheet
- Size (M2 to M56, 3/8″ to 4″)
- Standard (ISO, DIN, ASME, IFI and SAE)
- Material (Nickel based alloys, Copper alloys, Aluminum alloys, Super duplex steels, Titanium alloys)
- Heat treatment (Solution Annealing, Annealing, Stress Relieving, Stabilizing Treatment, Vacuum Heat Treatment, Post Weld Heat Treatment, Normalizing)
Material List
Nickel alloys
Copper alloys
Aluminum alloys
Titanium alloys
Super duplex steels
The product is used in the project
Excellent performance visualization
In oil and gas pipelines, ASTM A320 L7 bolts secure critical flange joints, valves, and compressors. Their high tensile strength and superior low-temperature impact toughness prevent brittle fracturing and leaking under extreme sub-zero conditions and high pressure.
Full Traceability
At HOTFORGE INDUSTRIAL LIMITED, traceability is a complete system linking each fastener to its raw material heat number, MTC (3.1/3.2), and production batch. From forging and heat treatment to machining, surface finishing, and inspection, all processes are recorded and fully traceable.
Each bolt is also marked on the head with manufacturer logo, material grade, and strength class for easy identification. All test results and production data are stored and connected to each batch, ensuring full transparency and reliable quality control for industries such as oil & gas, petrochemical, and power generation.
Third party laboratory
At HOTFORGE INDUSTRIAL LIMITED, every production batch is fully verified through both our in-house laboratory and accredited third-party testing facilities. Each batch undergoes strict inspection and testing, including mechanical properties, chemical composition, and material identification, ensuring full compliance with international standards. The combination of independent internal testing and external third-party validation provides dual assurance of quality, reliability, and traceability, delivering consistent and trustworthy performance for critical applications in industries such as oil & gas, petrochemical, and power generation.
Delivery guarantee
We ensure efficient and reliable global delivery through a well-established logistics network. Our factory transportation department is equipped with trucks that can quickly and economically transport to major ports. We work closely with leading airlines and shipping companies to simplify cargo handling, reduce unnecessary delays in documentation and coordination. In addition, our international logistics partners provide complete destination services, including last mile delivery and door-to-door solutions. This integrated supply chain system significantly improves transportation efficiency and ensures timely and perfect delivery of each project.
FAQs
Our factory has obtained ISO9001，ISO14001，ISO45001，IATF 16949，PED 2014/68/EU，API 20E / API 20F，ISO 17025 certification.
Yes, all high nickel alloy and special stainless steel fasteners (such as Alloy C276, Inconel, etc.) manufactured by HOTFORGE are strictly accompanied by material testing certificates that comply with EN 10204 3.1 standards. In addition, we can also provide third-party classification society 3.2 certificates for your special projects.
At present, I do not have a minimum order quantity requirement for the production department, and I can provide free samples for professional users to conduct experiments.
For standard inventory sizes, we can ship within 3-7 days.
For customized manufacturing or large-scale project bidding, our typical delivery cycle is 3 to 6 weeks, depending on the availability and quantity of materials. We always provide a guaranteed delivery date in the commercial invoice.
We support standard international payment methods such as T/T and L/C at sight.
For shipping, we offer flexible incoterms including FOB, CIF, CFR, DAP, and DDP via reliable global logistics partners.
Contact our sales team
If you are looking for reliable fastener solutions, our team is ready to provide a fast and accurate quotation based on your technical requirements, material specifications, and application conditions. At HOTFORGE INDUSTRIAL LIMITED, we support customized manufacturing, stable pricing, and prompt response for all inquiries. Simply click the “Request a Quote” button and our sales engineer will get back to you with a professional solution as soon as possible.