Import Flange — Buy in Bulk from Supplier in China

The carbon steel flange supplied by HQ Pipeline Co., Ltd. is manufactured to meet ASTM A105 and A105N standards, with select variants conforming to A694 F42 for high-pressure applications. These flanges are produced from low-carbon steel with a carbon content between 0.25% and 0.35%, and a maximum sulfur content of 0.040%, ensuring weldability and mechanical integrity. Dimensions follow ASME B16.5 standards for nominal pipe sizes from 1/2 inch to 24 inches, with pressure classes ranging from 150 to 2500. Each flange is machined to precise tolerances to ensure concentricity and flatness of the sealing surface.

The material composition aligns with standard carbon steel grades used in industrial piping, offering good tensile strength and moderate corrosion resistance when used in dry or non-aggressive environments. Typical surface finishes are smooth machined or mill finish, suitable for gasket sealing. While the listing does not specify heat treatment, A105N variants imply normalization to improve toughness. These flanges are available in weld neck, slip-on, blind, socket weld, and threaded types, each suited to different installation methods and pressure requirements.

These flanges are primarily purchased by engineering firms in oil and gas, chemical processing, and water treatment sectors where pipeline integrity under pressure is critical. Buyers typically require certification of material composition and dimensional compliance. Trade terms are offered as FOB Qingdao or CIF, with packaging in wooden crates or steel strapping to prevent surface damage during transit. Minimum order quantities are not specified and must be confirmed directly with the supplier.

HQ Pipeline Co., Ltd. is based in Qingdao, Shandong Province, China, with a physical address listed as No33, Lian Yun Gang Road. The supplier is classified as imported and harbor-trusted, indicating verified presence and export activity. The listing does not disclose company history, employee count, or annual turnover. It does not claim certifications beyond material standards, nor does it list past clients or project references.

The supplier focuses exclusively on the production and export of flanges and related piping components. There is no mention of in-house testing facilities, R&D, or ISO certification. Response rate and average response time are not recorded, suggesting limited or no buyer communication infrastructure. Buyers must verify technical details directly with the supplier before placing orders.