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Very practical stainless steel pipe common knowledge, worth collecting
Aug 22, 2018

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1. What is heat treatment


Heat treatment is a comprehensive process of controlling the performance of a material by heating it, holding it, cooling it, and changing its surface structure or internal structure.


2. What are the tests for stainless steel pipes?


The detection of stainless steel pipes mainly includes chemical composition testing, physical property testing and some additional quality testing (water pressure, eddy current, etc.).


3. What are the non-destructive testing?


Commonly used non-destructive testing for detecting seamless pipes mainly includes X-ray inspection, ultrasonic inspection, and eddy current inspection.


4. Advantages of non-destructive testing compared to other tests


High sensitivity, intuitive, reliable, repeatable, and will not damage the pipes.


5. What is the difference between the stainless steel square tube process and the round pipe?


Basically, there is no difference, except that round tube finished first and then presses the finished square tube with a mold.


6. What is the mold fee?


The mold cost is the cost of the customer's need for special specifications of the pipe, mainly because the factory does not have the relevant mold, so that the product of this specification can not be produced, so the money is needed to buy the mold, so that it can be produced.


7. What is the delivery by actual weight?


Since the total amount calculated according to the theoretical weight at the time of contract signing, when the weight is settled, the actual weight will differ from the theoretical weight. Therefore, the total amount should be settled according to the actual weight to avoid disputes.


8. How is the theoretical weight calculated?


(outer diameter - wall thickness) × wall thickness × 0.02491 = kg / m (for chrome nickel stainless steel such as 301, 304, 321 etc.)


(outer diameter - wall thickness) × wall thickness × 0.02507 = kg / m (for chrome nickel molybdenum stainless steel such as 316, 316L)


9. What does the stove number mean?


It is equivalent to the production batch number of the product.


10. What is tolerance?


The allowable variation of the actual parameter value is the allowable error range.


11. What is the range of the fixed length


It is a fixed length within a certain range, generally different from an indeterminate ruler, such as a 3-4 meter fixed length.


12. What is intergranular corrosion?


A type of localized corrosion. Corrosion that extends toward the interior along the interface between the metal grains.


13. Is stainless steel magnetic?


Theoretically, austenitic stainless steels are not magnetic, and martensite and ferritic stainless steels are magnetic.


14. Advantages of stainless steel pipes compared to other materials


The advantages of stainless steel are mainly resistance to ordinary corrosion, beautiful materials and relatively low price.


15. What are the states of the stainless steel pipe surface?


There are several states such as polishing, pickling, and sand blasting.


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    Add:Fl19th,Huameng Business Plaza, No.2 Chezhan Road, Lucheng District, Wenzhou, Zhejiang Prov
    Tel:+86-0577-86008557
    Mob:+8613600679430
    E-mail:marketing@zjzgsteel.com
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