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Seamless Carbon Steel Tube and Pipe

Chemical Properties

Chemical Compositions, 20# Steel
C: 0.17%~0.2%
Si: 0.17%~0.37%
Mn: 0.35%~0.65%
S: ≤0.035%
P: ≤0.035%
Cr: ≤0.25%
Ni: ≤0.25%
Cu: ≤0.25%

Chemical Compositions, 45# Steel
C: 0.42~0.50%
Si: 0.17%~0.37%
Mn: 0.50~0.80%
Cr: ≤0.25%

Chemical Compositions, Q345 (16Mn)
16Mn seamless carbon steel tube is high strength structural steel with low alloy content. Carbon content is 0.1%-0.25%. Alloy elements in the steel include Mn, Si, V, Nb, Ti, etc. The total alloy content is <3%. According to strength, it is divided into 4 grades, i.e. 300, 350, 400 and 450MPa.

Grades: Q295, Q345, Q390, Q420, Q460
C: 0.12~0.20; Mn: 1.20~1.60; Si: 0.20~0.55

Mechanical Properties
Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation ( % )
10 ≥335 ≥205 ≥24
20 ≥390 ≥245 ≥20
35 ≥510 ≥305 ≥17
45 ≥590 ≥335 ≥14
Q345 ≥490 ≥325 ≥21

Main Applications
The carbon steel tubes are seamless steel tubes for general structures and mechanical structures. They are suitable for pressure tubing, mechanical tubing, hydraulic fluid line tubing, special shape tubing, etc. in various industries such as construction, automobile parts, agriculture, traffic, logistics and warehousing, etc.

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