16Mn Seamless Steel Pipe

What is 16Mn seamless pipe?

16Mn is a kind of material in CS seamless pipe. 16Mn is a low-alloy high-strength structural steel: the carbon content is 0.1%-0.25%, and the main alloying elements manganese, silicon, vanadium, niobium and titanium are added; its total alloy content is less than 3%.

According to the strength, it is divided into 4 grades of 300, 350, 400 and 450MPa, mainly including Q295, Q345, Q390, Q420 and Q460. "Q" is the capital letter of the Chinese pinyin of the word "Qu" for yield, and the subsequent number is the minimum yield point (σs) value of the brand, and the subsequent symbols are based on the content of impurity elements (sulfur, phosphorus) in the steel from high to high. Low and with the change of carbon and manganese elements, it is divided into four grades: A, B, C, and D. Among them, A and B grade steel are usually called 16Mn.

Classification:
16Mn is a material in seamless steel pipes, a name for Q345B seamless steel pipes in the past.

The current name is: Q345B seamless steel pipe, and the similar materials are Q345C, Q345D, Q345E, and the quality grade symbols ABCDE represent different requirements for impact tests, and the impact test temperatures are +20 degrees, 0 degrees, -20 degrees, 40 degrees Spend. The quality grade of Q235 is divided into four grades: A, B, C and D, and from A to D represent the quality from low to high.

The requirements for different quality levels are as follows:
A——Provide S, P, C, Mn, Si chemical composition and fu, fy, δ5 (δ10), and 1800 cold bending test can be provided according to the buyer's needs, but there is no impact energy regulation, carbon content and manganese content are not taken as delivery conditions.
B——Provide S, P, C, Mn, Si chemical composition and fu, fy, δ5 (δ10), cold bending 180' test. It also provides impact energy Ak≥27J at +200°C.
C——In addition to the same requirements as Class B, the impact energy Ak≥27J at 0°C is also provided.
D----In addition to the same requirements as Class B, it also provides impact energy Ak≥27J at -200°C.
E——In addition to the same requirements as Class B, the impact energy Ak≥27J at -400°C is also provided.

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