Recently, our company accompanied an overseas customer to visit our cooperative steel mill to inspect the production process and quality testing of P275N steel plates for their confirmed order.

The visit focused on verifying whether the steel plates meet the requirements of EN 10028-3 and the technical conditions specified in the contract.

The inspected material was P275N normalized pressure vessel steel plate, which is widely used in pressure vessels, boilers, storage tanks, and energy equipment.

For this order, the plates were produced under strict process control, including steelmaking, hot rolling, and normalizing heat treatment, to ensure stable mechanical properties and uniform internal structure.

During the visit, the customer reviewed the key production stages of the P275N steel plates, including:

Raw material and steelmaking control

Hot rolling process and thickness accuracy

Normalizing heat treatment

Plate cutting, marking, and surface inspection

Our technical engineers explained how each process step contributes to achieving the required strength, toughness, and weldability of P275N steel.

Chemical composition was tested to ensure compliance with EN 10028-3. The test results of the inspected plates are shown below:

Table 1: Chemical Composition of P275N Steel Plate (Heat Analysis, wt.%)

The results confirm that all elements are well within the standard limits, ensuring good weldability and pressure performance.

Mechanical tests were conducted on normalized test samples. The results are summarized below:

Table 2: Mechanical Properties of P275N Steel Plate

The mechanical performance demonstrates that the steel plates provide sufficient strength and ductility for pressure vessel applications.

In addition to chemical and mechanical testing, the plates were subjected to:

Ultrasonic Testing (UT) for internal defect detection

Plate thickness and flatness measurement

Surface quality inspection

All inspected plates passed the required acceptance criteria, with no harmful internal defects detected.

After reviewing the production process and inspection data, the customer confirmed that the P275N steel plates fully comply with EN 10028-3 and project requirements.

The transparent inspection process and complete test records provided strong confidence for the execution of the order and upcoming shipment.

We remain committed to supplying reliable pressure vessel steel plates, offering full traceability, and supporting customers with professional technical service throughout the order lifecycle.