HFW Steel Pipe OD508

Huayang Steel Pipe's Quality Control System for Schedule Pipe: Covering the Entire Production Cycle

Quality control is the core competitiveness of Huayang Steel Pipe's schedule pipe products. The company has established a "three-level quality control system" (raw material inspection, in-process inspection, and finished product inspection) in accordance with ISO 9001 and API Q1 standards, and integrates advanced testing equipment and strict inspection procedures to ensure that every schedule pipe meets the required standards.

Raw Material Inspection: Strictly Controlling the Source of Quality

The quality of schedule pipe starts with raw materials. Huayang Steel Pipe has established long-term cooperative relationships with well-known steel mills (such as Baosteel, Wuhan Iron and Steel) and implements a "double inspection" system for incoming steel strips:

Document Inspection: Check the quality certificate of the steel strip, focusing on chemical composition (C, Mn, Si, P, S content) and mechanical properties (yield strength, tensile strength, elongation) to ensure that it meets the requirements of the corresponding schedule pipe grade (e.g., electric resistance welded steel pipe for SCH 40 requires a steel strip with yield strength ≥235 MPa).

Physical Inspection: Randomly sample the steel strip for chemical composition analysis using an optical emission spectrometer (OES) and mechanical property testing using a tensile testing machine. For steel strips used in HFW steel pipe for high-pressure schedule pipe (such as SCH 160), additional impact testing (-40℃ V-notch impact energy ≥40 J) is performed to ensure low-temperature toughness.

In-Process Inspection: Real-Time Monitoring to Prevent Defects

During the production of schedule pipe, Huayang Steel Pipe arranges full-time inspectors at key stations to conduct real-time inspection and data recording:

Forming Inspection: Use a laser diameter gauge to measure the outer diameter of the formed pipe every 5 minutes, and a ultrasonic thickness gauge to detect the wall thickness at 4 points around the circumference-ensuring that the dimensional accuracy meets the schedule grade requirements.

Weld Seam Inspection: For ERW electric resistance welded steel pipe, 100% eddy current testing (ECT) is performed to detect surface and near-surface defects (such as cracks, inclusions) in the weld seam; for HFW steel pipe, 100% ultrasonic testing (UT) is added to detect internal weld seam defects (such as lack of fusion, porosity). Huayang Steel Pipe's testing equipment adopts American GE ultrasonic flaw detectors, with a defect detection sensitivity of ≥0.5mm.

Heat Treatment Inspection: For schedule pipe requiring heat treatment (such as HFW SCH 160), a portable hardness tester is used to measure the hardness of the weld seam and base metal after heat treatment, ensuring that the hardness is within the range of 180-240 HB-avoiding excessive hardness that may cause brittleness.