Q345R Steel Plate Thickness 6.0 - 50.0mm for Pressure Vessel 1500mm 2000mm 2200mm Width

Q345R Steel Plate Thickness 6.0 - 50.0mm for Pressure Vessel 1500mm 2000mm 2200mm Width

Q345R is common low alloy steel, it is the boiler pressure vessel commonly used steel type, the delivery state: hot rolled or normalization.

Q345R Appication:

• Q345R steel plate is used in the inner tube of the multi-layer container, for the shell thickness is larger than 36mm for other compression elements (flanges, tube plates and flanges).
• If the thickness of the cap is greater than 50mm, it should be used in the state of normalization: For steel plates used for multi-layer containers or for steel plates with a thickness of more than 60mm, each of the heat treated steel plates should be stretched and v-shaped Mouth impact test.
• According to the design document, for steel plate with thickness greater than 80mm, ultrasonic testing can be added to steel plate thickness.
• For steel plate thickness is 30 ~ 36 mm, ultrasonic testing requirement is not lower than level Ⅲ.
• For steel plate thickness is greater than 36 mm, ultrasonic testing is required not lower than level Ⅱ..

Q345R is a combination of 16Mng, 19 Mng and GB6654-1996, and GB150 specified the thickness range is 3 ~ 200mm. The limit value of the tensile strength with low carbon content and standard is no more than 540Mpa, and it has good weldability, in common conditions cold and hot crack are not easy to form. However, the same as the 20 # carbon manganese structure steel, with large thickness and in low ambient temperature working environment, it produces cold, hot cracks.

Q345R steel contains a certain amount of alloy elements, yield strength tends to be high, Therefore, we should review the real destrength ratio (real yield strength) from the quality guarantee certificate of the steel or the production unit (The ratio of the degree to the actual tensile strength).

Q345R Steel Plate Chemical Composition:

Q345R Steel Plate Mechanical Property:

Q345R Steel Plate Welding Feature:

• When yield ratio is ≤ 0.75, more than 0.8 might have higher risk of crack forming. Preheating of steel plate welding is not required. When steel plate thickness is ≤34, preheat to 100 ~ 150 ℃ when steel plate thickness is > 34, additionally eliminate stress is needed after welding heat treatment, heating temperature range 600 ~ 640 ℃, usually air cooling after the heat preservation furnace cooling to under 400 ℃.
• When the carbon content of partial minimum Q345R steel welding basic no strict limits on line, for it is overheating sensitivity is not high, cold cracking tendency is low, but for the goodness of plasticity and toughness overheated zone, small linear energy is better.
• When welding Q345R steel of carbon content on the high side, for the hardening tendency increases, the content of martensite increases, it will cause the string cable energy cold cracking tendency increase, embrittlement of overheated zone also become serious, this situation is offline energy partial bigger is better.

Q345R Steel Plate Temperature Limit Due to Plate Thickness:

• Steel plate thickness ＜6mm: no impact test, use temperature lower limit is - 20 ℃.
• Steel plate thickness 6 ~ 20 mm: impact test at 0 ℃, temperature lower limit is - 20 ℃.
• Steel plate thickness 20 ~ 25 mm, impact test at 0 ℃, temperature lower limit is- 10 ℃.
• Steel plate thickness 25 ~ 200 mm, impact test at 0 ℃, temperature lower limit is 0 ℃.
• Steel plate thickness > 20 ~ 30 mm hot rolled steel plate thickness controlled rolling state; supply agreement guarantee - 20 ℃ impact test, temperature limit for - 20 ℃.
• Steel plate thickness > 20 ~ 200 mm, normalizing state; supply agreement guarantee - 20 ℃, temperature lower limit is - 20 ℃.

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