I. Specification of Stainless Steel Seamless Steel Pipe
A According to GB 14975-94 Seamless Stainless Steel Pipe, the usual steel pipe length (indefinite length) is 1.5 ~ 10m for hot-rolled steel pipe and 1m for hot-extruded steel pipe. The wall thickness of cold-drawn (rolled) steel pipe is 0.5 ~ 1.0~7m,1.0 ~ 7m; If the wall thickness is greater than 1.0mm, it is 1.5 ~ 8m.
B, 45 kinds of hot-rolled (hot-extruded) steel pipes with diameters of 54 ~ 480mm * * * * 36 species with wall thickness of 4.5 ~ 45 mm * * *. 65 kinds of cold-drawn (rolled) steel pipes with diameters of 6 ~ 200mm * * *; The wall thickness is 0.5 ~ 2 1mm * * * 39 kinds.
C. There shall be no cracks, folds, cracks, cracks, rolling injuries, delamination and scarring on the inner and outer surfaces of steel pipes. These defects shall be completely removed (except for pipes used for mechanical processing), and the thickness and outer diameter of the removed rear wall shall not exceed negative deviation. Other minor surface defects not exceeding the allowable negative deviation may not be removed.
D, the allowable depth of the straight line. Hot-rolled and hot-extruded steel pipes with a diameter less than or equal to 140mm should not be greater than 5% of the nominal wall thickness, and the maximum depth of cold-drawn (rolled) steel pipes should not be greater than 0.5mm, and the maximum depth should not be greater than 0.3mm.. ..
E, steel pipe ends should be cut into right angles, and deburring.
Second, the identification method of stainless steel seamless steel pipe
1. Quantity and expression of steel
(1) Use international chemical element symbols and national symbols to represent chemical components, and use Arabic letters to represent component content;
Such as: China-Russia 12CrNi3A.
(2) The series or number of steel is represented by a fixed number of digits; Such as: USA, Japan, 300 series, 400 series, 200 series;
(3) with Latin letters and sequence number, only for use.
2. International stainless steel marking method
The American Iron and Steel Association uses three numbers to represent various standard grades of malleable stainless steel. These include:
① Austenitic stainless steel is marked with 200 and 300 series numbers,
② Ferritic and martensitic stainless steels are represented by 400 series numbers. For example, some common austenitic stainless steels.
It is marked with 20 1, 304, 3 16, 3 10.
③ ferritic stainless steel is marked with 430 and 446, and martensitic stainless steel is marked with 4 10, 420 and 440C.
Remember, biphasic (austenite-ferrite),
(4) Stainless steel, precipitation hardened stainless steel and high alloy with iron content less than 50% usually adopt patent name or trademark name.
Name.
Stainless steel seamless steel pipe is not only corrosion-resistant, but also good in cost performance, actual service life and bending and torsion strength, so we find that it plays a vital role in petroleum, chemical industry, medical treatment, food, light industry, mechanical instruments and other fields. The above is the explanatory text given by Bian Xiao from the perspective of friends who are interested in buying. Consumers who are interested in reference can analyze this information and their own demand budget and buy the most satisfactory products.