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Introduction and application of alloy steel pipe

From: Shandong Baote Metal Products Co., Ltd.  DATE: 2022/3/30  Hits: 4366

Introduction and application of alloy steel pipe

4140 steel is an ultra-high strength steel with high strength and toughness and good hardenability. Application of alloy Seamless Steel Pipe: the special steel grade for bridge is "ASTM 4140", the special steel grade for automobile girder is "ASTM 4140", and the special steel grade for pressure vessel is "ASTM 4140". This kind of steel depends on adjustin...
4140 steel is an ultra-high strength steel with high strength and toughness and good hardenability.

Application of alloy Seamless Steel Pipe: the special steel grade for bridge is "ASTM 4140", the special steel grade for automobile girder is "ASTM 4140", and the special steel grade for pressure vessel is "ASTM 4140". This kind of steel depends on adjusting the carbon content (c) to improve the mechanical properties of steel. Therefore, according to the carbon content, this kind of steel can be divided into: low carbon steel - the carbon content is generally less than 0.25%, such as 10 and 20 steel; Medium carbon steel - the carbon content is generally between 0.25 ~ 0.60%, such as 35 and 45 steel; High carbon steel - carbon content is generally greater than 0.60%. This kind of steel is not generally used in the manufacture of Steel Pipes.

There is no obvious tempering brittleness and small deformation during quenching. The alloy seamless steel pipe has high fatigue limit and multiple impact resistance after quenching and tempering treatment, good impact toughness at low temperature, and high creep strength and lasting strength at high temperature. 4140 seamless steel pipe usually takes surface quenching after quenching and tempering as the heat treatment scheme.

Chinese alloy seamless steel pipe is a kind of steel material. Steel used to be called steel. It is called Q345B. The similar materials are Q345A, Q345C and Q345E. The quality grade symbol a, B, C and D E respectively indicates that the impact test is not required. The impact test temperature is + 20 degrees 0 degrees - 20 degrees 40 degrees. ABCD indicates the quality grade Q235. The quality grade is divided into four grades A, B, C and D. from a to D indicates that the quality is 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 δ 5( δ 10) , the 4140 seamless Steel Pipe Manufacturer can provide 1800 cold bending test according to the buyer's needs, but there is no impact energy regulation, and the carbon content and manganese content are not taken as the delivery conditions.

B - provide s, P, C, Mn, Si chemical composition and Fu, FY δ 5( δ 10) , cold bend 180 'test. It also provides the impact energy AK ≥ 27j at + 200C - in addition to the requirements of class B, it also provides the impact energy AK ≥ 27j at 00C. D --- besides the requirements of class B, it also provides the impact energy AK ≥ 27j at - 200C e -- besides the requirements of class B, it also provides the impact energy AK ≥ 27j at - 400C.

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