TOBO STEEL GROUP CHINA |
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Small Diameter Steel Pipe Outer Circle 10mm 5mm Inner Diameter Wall Thickness 2.5mm Hollow Iron Pipe Carbon Steel Round
(1) Specification: the specification requirements of spiral steel
pipe should be listed in the import and export trade contract.
Generally, it should include the standard brand number (type code),
the nominal diameter of the steel bar, the nominal weight (mass),
the specified length and the allowable value of the above
indicators. Our country standard recommends spiral steel pipe
series with nominal diameters of 8, 10, 12, 16, 20, 40mm. Supply
length is divided into fixed length and double length. China's
export rebar length selection range is 6 ~ 12m, Japanese rebar
length selection range is 3.5 ~ 10m.
(2) Appearance quality: ① Surface quality. The surface quality of
rebar is stipulated in the relevant standards, requiring that the
end should be cut flat and straight, the surface shall not have
cracks, scarring and folding, and there shall be no harmful defects
in use; (2) Allowable value of dimension deviation. The bending
degree of rebar and the requirements of steel bar geometry are
specified in the relevant standards. As stipulated in Chinese
standards, the bending degree of straight bar is not greater than
6mm/m, and the total bending degree is not greater than 0.6% of the
total length of bar.
Delivery length is also called customer required length or contract
length. The standard has the following provisions on delivery
length:
A, ordinary length (also known as irregular length) : where the
length is within the standard length range and there is no fixed
length requirements, are called ordinary length. For example,
structural pipe standards: hot rolled (extruded, expanded) steel
pipe 3000mm ~ 12000mm; Cold-drawn (rolled) steel pipe 2000mm ~
10500mm.
B. Fixed length: the fixed length shall be within the normal length
range and is a fixed length specified in the contract. But in
practice, it is impossible to cut absolute length, so the standard
stipulates the allowable positive deviation value for the length of
definite length.
The structural pipe standard is:
The yield of fixed length pipe decreases more than that of normal
length pipe, so it is reasonable for the manufacturer to raise the
price. Add price range each enterprise is not consistent, add price
10% or so on base price foundation commonly.
C. Length of multiples: the length of multiples shall be within the
normal length range, and the single length and the multiple of the
total length shall be indicated in the contract (e.g. 3000mm×3,
i.e. 3000mm 3x, with a total length of 9000mm). In practice, the
allowable positive deviation of 20mm should be added to the total
length, plus the incision allowance should be left for each single
ruler length. Take the structural pipe as an example, the specified
incision allowance: outer diameter ≤159mm is 5 ~ 10mm; Outer
diameter >159mm is 10 ~ 15mm.
If there is no length deviation and cutting allowance in the
standard, it shall be indicated in the contract through negotiation
between the supply and demand parties. Double ruler length is the
same as fixed ruler length, which will greatly reduce the yield of
production enterprises. Therefore, it is reasonable for the
production enterprises to raise the price, which is basically the
same as the fixed ruler length.