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[China]
Trade Verify
Address: No.208,Lvdi Road,Baihe Town,Qingpu District,Shanghai,China
Contact name:
TOBO STEEL GROUP CHINA |
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Verified Suppliers
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304 Stainless Steel Tube Sanitary Grade Hollow Tube, Internal And External Polished Seamless Tube Capillary 25
GB3087-2008 "Seamless Steel pipe for Low and medium pressure
boiler" provisions. Chemical composition test method according to
gb222-84 and GB223 "Methods for chemical Analysis of Steel and
Alloy" relevant part.
(2)GB/T5310-2008 "Seamless Steel Tubes for High pressure Boilers"
provisions. Chemical composition test method according to GB222-84
and "Method for Chemical Analysis of Iron and Steel and Alloy",
GB223 "Method for chemical analysis of Iron and Steel and Alloy".
Chemical composition inspection of imported boiler steel pipe
shall be carried out according to relevant standards stipulated in
the contract.
(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.
