Differenct material of steel pipe

Steel pipe of contrast material: steel pipes of various kinds of material what is the difference

The difference between the Q235 and Q345 different:

1, the yield strength of Q235 lower limit is 235 mpa, yield strength of Q345 lower limit is 345 mpa (Q) for the meaning of Chinese characters "bow" of the word, the back of the lower limit value represents the yield strength)

2, the two different alloy content: for ordinary carbon steel Q235, Q345 low alloy steel

Q235 carbon structural steel, and the old standard GB700-79 grades A3, C3

Q345 is low alloy structural steel, and the old standard 1591-88 grades 12 MNV 16 mnre, 18, 16 mn nb, 14 MNNB

Strength requirement of Q235, metal structure, the core of carburized or cyanide parts, tie rod, connecting rod, hook, coupler, bolt and nut, sleeve, shaft and welding parts

Q345 - good comprehensive mechanical properties, low temperature performance may also, plasticity and good weldability, used in low pressure vessel, oil tank, vehicles, cranes, mining machinery, power stations, Bridges under moving load of the structure, mechanical parts, building structure, general metal parts, hot rolled or normalizing state, can be used in various structure below 40  cold areas.

According to you design the structure of the specific situation. Such as structural strength is controlled, can consider to use Q345 is such as structural stiffness control, can consider to use Q235 Q345 price a little expensive, but because of its high strength, can save material. Choose from the above comprehensive comparison.

Q235, Q345 is based on the yield strength of steel to 235 mpa and 345 mpa, respectively Q345 is a bit expensive, but the price difference is not very big.

Brand Q195, Q215, Q235, Q255 and Q275 difference

Q195, Q215, Q235, Q255 and Q275 said steel grades respectively, the steel grades by the letters represent the yield point (Q), yield point value, quality, quality of symbols (A, B, C, D) deoxidizing method of symbol and so on four parts in order. Points from the chemical composition, low carbon steel grades Q195, Q215, Q235, Q255 and Q275 brand, the higher the carbon content and manganese content, its plasticity is more stable. Above points from mechanical properties, the brand said of the yield point of the steel thickness of 16 mm or less. Its tensile strength is respectively: 315-430, 335-335, 450-500, 410-550, 410-630 (obN/was); Qi the elongation is respectively: 33, 31, 26, 24, 20 (0.5 j)

The difference between brand Q235A and Q235B

Q235A and Q235B steel are both belong to the carbon steel. In national standard GB700-88, the differentiation of Q235A and Q235B material mainly in terms of the carbon content of steel, the material for the material of Q235A carbon content between 0.14 0.22 j. Q235B material impact experiment, but often do temperature shock experiment, v-shaped gap. Relatively speaking, on the mechanical properties of the material for Q235B steel is far superior to the material of Q235A steel. In general, steel mills before the finished product profile factory by marking on the identity CARDS. The user can distinguish sign on its material is Q235A, or Q235B, or other material.