What's the difference between steel Q245R and Q345R

Q345R was called 16MnR steel, which has good process performance and comprehensive force performance. It is widely used in the industry, and the consumption is also the largest among pressure vessel steel plates. Steel Q245R is a kind of vessel steel and carbon steel structural steel to make boilers. For example, Q245R steel has been widely used in the countries like the United States, Canada, India, Australia and Europe, and the prospect is relatively good.

From the analysis of the chemical composition of the two steel plates, the contents of Q245R and Q345R are the same except for silicon and manganese. When steel Q245R is at the same design temperature as Q345R, the allowable stress is much lower. If the thickness of steel Q245R is increased at this time, it is obviously not economical. Then the allowable stress of Q345R is higher, and this material is more suitable. For users with stress corrosion media, it is necessary to choose Q245R material, which can better reduce the stress corrosion and ensure the safety of the container. If there are no specific requirements for the pressure vessel, it is recommended to choose the material Q345R, because both its toughness and strength are higher than steel Q245R.

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What's the difference between steel Q245R and Q345R Specification[email protected]

Steel Q245R chemical composition ( max, %):

Grade C Si Mn Cu Ni Cr Mo Nb V Ti Alt P S Other
Q245R 0.20 0.35 0.50-1.10 0.30 0.30 0.30 0.08 0.05 0.05 0.03 ≥0.02 0.025 0.01 Cu+Cr+Ni+Mo≤0.70

Notes: 1) The lower limit of C content may not be required upon agreement between the supplier and buyer.
2)The upper limit of manganese content can be increased to 1.20% for Q245R plate above 60mm thick.

Steel Q245R mechanical property:

Thickness (mm) > 3 ≤ 16 > 16 ≤ 36 > 36 ≤ 60 >60 ≤ 100 >100 ≤ 150 >150 ≤ 250
Yield strength (≥Mpa) 245 235 225 205 185 175
Tensile strength (Mpa) 400-520 390-510 380-500 370-490
Elongation ≥25% ≥24%

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Henan BEBON Iron & Steel Co., Ltd was founded in 2000, which initially focus on providing high-quality steel products to serve for China's rapid infrastructure development. Based on the advantages of steel resources in domestic market and good reputation, combining with the huge international market demand for steel products, BEBON started the international business in 2010 and successfully being approved and certified by ISO9001:2008, the Registration number is 626014Q11531R0S. With the quality steel products and professional service, BEBON was award the international acclaim from infrastructure, shipbuilding, petroleum industry etc., and gradually grow into a bright star in the steel export industry .

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