Quality Assurance

SGS Certificate
ISO-9001 Certificate

Our Approach To Quality

To be a recognized stainless steel tubes company in the industry, we were firstly awarded the certifications to comply with international quality and environment standards. Our quality system lays the stress on the prevention rather than detection. We focus on the needs of both our employees and customers. We won’t mark time, we will keep working on being a technical, diversified and large-scale manufacturer.

Quality And Efficiency

We keep improving our efficiency from some details without any impact on the quality. We utilize the full-automatic production and packaging platform to all production lines. We have in-house cranes and forklifts for the safety of our staff and high efficiency. As a result, we save up to 3/4 times than other manufacturers in the industry.
Our Inspection Standard
All tubes from Yaolong are manufactured strictly according to the international standards. Download the manufacturing/inspection standard lists.
ASTM A554 (EN 10296-2 & EN 10219-2) Standard
ASTM A249 Standard
ASTM A269 Standard
ASTM A270 (EN 10217-7 & EN 10357) Standard

Quality Control Approach

Precise and Reliable.
#1 Raw Material Inspection
Careful inspection of the raw materials to eliminate potentially flawed materials.
#2 Dimension Inspection
To test completely if the thickness and length comply to the precise dimensional tolerance range.
#3 Surface Inspection
Strict test of the surface brightness and texture, the fineness of sand lines, no blister or black lines.
#4 Mechanical Properties Testing
Tensile, hardness, flaring, flange, reverse bend tests to ensure proper yield stress and tensile strength.
#5 Eddy Current Testing
Uses electromagnetic induction to identify defects in the piping and guarantee the air tightness.
#6 Intergranular Corrosion Testing
Finish testing to make sure the piping is anti-corrosion, suitable for a specific or generic environment.

Third-Party Inspection Report

Incoming Materials
Our incoming materials come with the report of chemical composition and mechanical properties. We know your needs on the accuracy, so it is available here to provide the report as required.
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