Q345R Alloy For Pressure Vessels

Q345R Alloy for Pressure Vessels

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℃to the actual tensile strength).

Yield strength >=345MPa (for thickness <=16mm) and tensile strength 470-640MPa, with outstanding load-bearing capacity.

Good low-temperature impact toughness (impact energy at 0℃ meets standards), suitable for severe cold conditions or working environments with temperature fluctuations.

Low carbon equivalent and excellent weldability, supporting various processes such as arc welding and gas shielded welding, with weld strength matching the base metal.

Good cold bending and cutting performance, facilitating the forming of complex structures.

By adding alloying elements (e.g., Mn, Si, etc.) and controlling phosphorus and sulfur contents (P<=0.025%, S<=0.010%), it has hydrogen-induced cracking (HIC) resistance, extending the service life of equipment

First, the operating conditions of the equipment (such as design pressure, design temperature, characteristics of the medium), the welding properties of the material, the hot and cold processing properties, the heat treatment, and the structure of the container must be considered.

1. When the required steel plate thickness is less than 8mm, carbon steel plate (except for multi-layer containers) should be used between carbon steel and low-alloy high-strength steel.

2. In the case of stiffness or structural design, ordinary carbon steel should be used as much as possible. In the case of strength design, steel plates such as Q235B, 20R (20G) and Q345R (16MnR) should be used in turn according to the restrictions on pressure, temperature and medium.

3. When the thickness of the required stainless steel is greater than 12mm, the structural forms such as lining, composite and surfacing should be used.

4. Stainless steel should not be used as heat-resistant steel with a design temperature of 500 degrees Celsius or less.

5. Pearlitic heat-resistant steel should not be used as heat-resistant steel with a design temperature of 350 ℃ C or less. When pearlitic heat-resistant steel must be used as heat-resistant steel or hydrogen-resistant, the variety and specifications of steel should be minimized and combined.

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alloy@gneesteelgroup.com

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