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The common inquiries that we usually get from clients are these: How do we know if stainless steel is authentic? And if the steel corroded after some time, does it mean the product was fake or substandard?
At Sanyo Seiki, we make sure that our product specifications and dimensions are verified using calibrated measuring devices before we sell them to our customers.
When testing the steel for corrosion, the focus is given on the stainless steel applications and it is ascertained if the right grade of stainless steel was appropriate for the said application after checking the exposure and the environment where it will be installed. We make it our mandate to educate our customers about the proper applications of the grades of stainless steel.
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Quality Assurance Cuts Costs, not Corners
Our Quality Assurance engineers secure the quality standards of our state-of-the-art machines for fast and efficient delivery of products to our customers. We can tailor fit for customer product specification.
We conduct preliminary checking and apply stringent quality control standards on all our incoming raw materials. These practices are our guideposts that we live each day.
Ace these fool-proof tests
Sorting and identification tests are non-destructive, inexpensive and rapid procedures, usually carried out on different grades of stainless steels. Sorting of product procedures is particularly useful when bars of grades 303 and 304 have been accidentally stored together, or when grades 304 and 316 sheet offcuts are mixed.
The purpose of these tests should help us at Sanyo Seiki and the client retain the original product identification and markings.
Let’s face it, when the different grades of stainless steels are put close to each other, it becomes very hard to identify them. Even a trained eye could fail.
Generally speaking, it is not possible to determine the composition of a stainless steel by simple visual inspection, even at close range. At Sanyo Seiki, we conduct a number of tests to sort and identify them. These are non-destructive, quick procedures which we carry out in our plants as precautionary measures.
Conducting these tests is important!
Although stainless steel may be corrosion-resistant, in truth, it is not corrosion-proof. Just like in taking medication, following the doctor’s advice is key to complete healing. There is one caveat that one must know to avoid disappointment:
When the selection of the stainless steel grade has not been properly made, corrosion may occur. Consulting a specialist early and at the end of the design and planning stage is indispensable.
The following tests ensure you are getting the right products for the right use:
Most ferrous alloys such as steel and cast irons may have similar densities and these make it difficult to distinguish between carbon and stainless steel. Through alloy analysis, we determine the chemical composition by weight of each stainless steel coil and products produced.
X-ray fluorescence (XRF) elemental analyzer spectrometer
The mere specification of a type of stainless steel grade for exterior architectural application is not in itself sufficient. Neither is its sheen nor texture will give one an assurance.
As part of our quality control, we use the x-ray fluorescence elemental analyzer spectrometer, for metal analysis. It is a real-time compliance testing. Whether you happen to be sorting or doing a routine maintenance in a plant, this is perfect tool for positive material identification.
A section of a tube will be flared with a tool to form a 60o wide in the opening of the tube. If after flaring, the tubes did not show any signs of cracks, dents and imperfections, then the set of tubes had passed the test. Such method is done to check the strength of welding line.
A hydrostatic test is performed by using water as the test medium. Performed under controlled conditions, a tube will be internally pressurized with air while submerged in water and is observed for leakage. Welded fabrications are frequently hydrotested for pressure tightness.
A standard test piece is gripped at either end by a suitable apparatus. A machine slowly exerts an axial pull so that the steel is stretched until it breaks. The test provides information on proof stress, yield point, tensile strength, elongation and reduction of area.
Flattening test mainly serves to detect internal and external flaws. It involves compressing a tubular ring between two planes placed parallel to a predetermined distance. Incipient cracks and internal or external defects which occur as result of this process are not permissible. The flattening test is conducted as described in ASTM A450 / ASTM A530