Import Astm A131 Ah36, Dh36, Eh36, Fh36, Steel Plate — Buy in wholesale FOB from Supplier in China

ASTM A131 AH36, DH36, EH36, and FH36 steel plates are normalized, high-strength low-alloy structural steels manufactured for shipbuilding and marine construction. These grades are differentiated by their minimum yield strength (355 MPa for AH36/DH36/EH36, 355 MPa with enhanced toughness for FH36) and their Charpy V-notch impact test temperatures: 0°C for AH36, -20°C for DH36, -40°C for EH36, and -60°C for FH36. The plates are produced through controlled thermomechanical rolling or normalizing, with carbon content typically below 0.18% to ensure weldability without preheating in most thicknesses.

The material conforms to ASTM A131/A131M, with chemical composition limits including manganese (0.90-1.60%), silicon (0.10-0.50%), and controlled sulphur/phosphorus levels (both 0.035% maximum). Grain size is fined through aluminium deoxidation, and plates undergo ultrasonic testing per ASTM A435 when specified. Thickness ranges from 5 mm to 150 mm in standard production, with widths up to 4,000 mm and lengths to 18,000 mm depending on mill capability. Surface condition is as-rolled or shot-blasted and primed for marine environments.

Primary buyers include shipyards constructing bulk carriers, tankers, container vessels, and offshore platforms, as well as marine equipment fabricators and naval repair yards. The grades are sequentially selected based on service temperature: AH36 for temperate waters, DH36 for cooler routes, EH36 for arctic or deep-water operations, and FH36 for extreme low-temperature hull structures. Importers should confirm with Henan HZZ Iron and Steel Co., Ltd. the specific grade availability, heat treatment condition, and third-party inspection requirements (ABS, DNV, LR, or BV classification society certification) for their intended application.

Henan HZZ Iron and Steel Co., Ltd. is located at Jincheng International Building, Zhengzhou, Henan Province, China. The supplier is classified as an imported-tier vendor with a harbor trust designation, indicating a verified business entity profile on the platform without transaction history or buyer feedback sufficient to advance to higher trust tiers. The response rate is recorded at 0.00% with zero average response hours, suggesting either a newly registered account, inactive listing management, or data capture at an early stage of platform engagement. No verified transaction volume, annual turnover, or factory ownership details are disclosed in the available profile data.

The listing focuses exclusively on ASTM A131 shipbuilding steel plates across four toughness grades, positioning the company as a specialized trader or mill agent in marine structural steels rather than a general steel stockist. The absence of disclosed production equipment, ISO certification numbers, or named shipyard clients means buyers should conduct direct due diligence on material traceability, mill test certificate authenticity, and classification society approval status before committing to orders. The Zhengzhou location places the company in central China's steel trading corridor, with proximity to mills in Henan, Hebei, and Shandong provinces, though this does not confirm direct manufacturing capability.