Import Carbon Steel Vessel Spherical Crown Head — Buy in Bulk from Supplier in China

The spherical crown head is a carbon‑steel pressure‑vessel component manufactured by Dingjin General Machinery. It is offered in diameters from 325 mm up to 10 000 mm with wall thicknesses ranging between 8 mm and 50 mm, and the company can also produce stamped heads up to 6 000 mm diameter by 400 mm thickness. The maximum end‑plate thickness achievable with the multi‑petal forming process is 300 mm, and the unit is equipped with German‑made spinning machines DF10050, DF2220 and MD21/5030 to achieve these dimensions.

Dingjin’s production line uses carbon steel that meets typical vessel‑grade requirements and is capable of complying with ASME Section VIII standards when requested. Typical surface finish for the heads is Ra 1.6 µm, and the hydraulic presses (including 8 000 ton and 16 000 ton units) allow consistent thickness control within ±0.5 mm. The facility’s 28‑crane fleet, each with a 100‑ton capacity, supports handling of heads weighing up to roughly 1 500 kg, which is standard for vessels of this size range.

These heads are suited for oil‑gas processing, petrochemical reactors and large‑scale storage vessels, where manufacturers and EPC contractors require reliable pressure containment. Buyers usually request certification to the relevant design code, as well as material test reports and dimensional inspection certificates. Dingjin states that FOB and CIF terms are available, but exact MOQs, lead times and payment conditions should be confirmed directly with the supplier before placing an order.

Dingjin General Machinery Co., Ltd. was founded in 2000 and operates from Jinzhou District, Dalian City, Liaoning Province, China. The plant occupies 74 000 m², holds a registered capital of US$3.065 million and total assets of US$2.857 million. Its production capability is supported by three German‑origin spinning units, seven hydraulic presses (including 2 000‑ton, 1 000‑ton, 8 000‑ton and 16 000‑ton dual‑action presses) and a fleet of 28 cranes with a 100‑ton lifting capacity.

The company’s product catalogue includes elliptical heads, hemispherical heads, conical heads and custom‑designed dished ends. While the listing does not provide a response rate or average reply time, the supplier is listed under the “harbor” trust tier, indicating a basic level of verification. Prospective buyers should request recent factory photos, equipment certificates and any available quality‑system documentation before finalising a contract.