Comprehensive analysis of API 5L BN seamless steel tube

1. Definition and Standards

API 5L BN seamless steel tube is a pipeline seamless steel pipe that complies with the American Petroleum Institute (API) standard "API SPEC 5L", designed specifically for energy transportation such as oil and natural gas. Its material grade "BN" belongs to a category in the API 5L standard and is suitable for general working conditions or specific corrosive environments.

2. Material correspondence relationship

Domestic grade: API 5L-BN corresponds to Chinese pipeline steel grade L245, which belongs to ordinary carbon structural steel.

Chemical composition: mainly low carbon and low sulfur and phosphorus, and the specific composition needs to comply with the limit of BN grade in API 5L standard.

3. Specification parameters

Outer diameter range: 6mm~1020mm, can cover the needs of small to large pipelines.

Wall thickness range: 3mm~120mm, meeting the transmission requirements of different pressure levels.

Delivery status: usually in hot-rolled or heat-treated state, ensuring mechanical properties meet standards.

4. Application scenarios

Oil and gas transportation: used in high-pressure scenarios such as onshore and subsea gathering and transportation pipelines, long-distance transportation pipelines, etc.

Acidic environment: Some BN grade steel pipes (such as BNS) have the ability to resist hydrogen sulfide (H ₂ S) corrosion through special treatment (such as calcification process), and are suitable for sulfur-containing oil and gas fields.

5. Performance characteristics

Pressure resistance: The seamless structure can withstand high pressure (such as water pressure tests up to 1070psig), ensuring pipeline safety.

Corrosion resistance: Prolonged service life through chemical composition control and surface treatment (such as internal and external epoxy resin coatings).

Processability: Supports groove and thread processing, making it easy to install and connect on site.

6. Price reference

Market prices fluctuate due to differences in specifications and processes, such as:

American standard API 5L Gr. B seamless steel pipe costs approximately 3200~3600 yuan/ton.

The price of sulfur resistant (H ₂ S) or low-temperature steel pipes (such as BNS) may be higher, and the specific calculation needs to be based on the order parameters.

7. Suppliers and Certification

Mainstream suppliers provide products that meet the dual certification of API 5L and GB/T 9711, and support third-party inspection.

Special requirements (such as sulfur resistance) require HIC (hydrogen induced cracking) and SSC (sulfide stress corrosion) testing reports.

summarize

API 5L BN seamless steel pipe, as a key material in the field of energy transportation, is widely used in the oil and gas industry due to its high strength, corrosion resistance, and standardized production. When making a purchase, it is necessary to select the corresponding grade (such as BN, BNS) based on the working conditions requirements (such as pressure, corrosive environment), and pay attention to the supplier's qualifications and testing certification.