１．Specifications and tolerances inspections for AP and BA tubes

Specifications (steel grade, finishing, hardness) required by customers are inspected by use of X-Ray fluorescence analyzer and tensile testing instrument. Tolerances in the required specifications (length, outer diameter, wall thickness or inner diameter) are inspected by other instruments and visually.

２．Eddy current inspection for AP and BA tubes

All cracks on outside surfaces which are out of required specifications are detected and rejected.

３．Mechanical inspection for AP and BA tubes

Mechanical properties such as tensile strength, proof stress and plasticity are inspected conforming to JIS standards.

４．Others

Other inspections conforming to JIS standards

1. Hydrostatic testing for AP and BA tubes

Proof pressure test is provided as requested by customer.

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2. Surface roughness measuring for BA tube

Sampling inspection by use of surface roughness measuring instrument as requested by customer

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3. Corrosion test for AP and BA tubes

To confirm no grain boundary corrosion cracking by use of sulfuric acid/copper sulfate　　

4. Dye penetrant test for BA tube

Inspection of minute cracks by penetrant liquid　　　　　

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5. Others

Inspections conforming to respective specifications of each countries