What is the equivalent of GB713 Q345R?

Q345R is a type of low-alloy steel plate used primarily for manufacturing pressure vessels and boilers. It is defined by a minimum yield strength of 345𝑀𝑃𝑎 and has good comprehensive mechanical properties, including impact toughness. The 'R' in the designation stands for "boiler" and indicates its use in high-pressure equipment.

GB713 Q345R is a low-alloy high-strength steel plate specifically designed for pressure vessels, widely used in China's pressure vessel manufacturing industry.

Excellent Mechanical Properties:
Yield Strength: Minimum yield strength of 345 MPa (yield strength may slightly decrease with increasing thickness for thinner plates).
Tensile Strength: 510-640 MPa.
Elongation: Greater than 21%, offering good plasticity and toughness.
Impact Toughness: Charpy V-notch impact energy greater than 34J at 0°C, ensuring good toughness in low-temperature environments.

Processing Properties:
Weldability: Q345R has good welding performance, suitable for various welding processes, but heat treatment and post-weld processing should be considered to prevent performance degradation.
Cold and Hot Working Properties: Suitable for cutting, bending, forming, and other processes, making it ideal for manufacturing complex structures.
Heat Treatment Condition: Typically delivered in hot-rolled or normalized condition, with options for quenching and tempering (Q+T) or thermomechanical controlled processing (TMCP) to optimize performance.

Corrosion and Wear Resistance:
Compared to ordinary carbon steel, Q345R contains small amounts of alloying elements (such as manganese and silicon), providing better corrosion and wear resistance, suitable for harsh environments.
Lower phosphorus and sulfur content compared to Q345 (16Mn) steel, further improving corrosion resistance and impact toughness.

Due to its excellent comprehensive properties, Q345R steel is widely used in the following fields:

Pressure Vessel Manufacturing:
Used in the production of boilers, pressure vessels, storage tanks, heat exchangers, etc., widely applied in the petroleum, chemical, natural gas, and power industries.
Suitable for equipment such as reactors, separators, liquefied gas tanks, and nuclear reactor pressure shells.

Shipbuilding and Marine Engineering:
Used for pressure vessel components in the shipbuilding industry, suitable for marine environments due to its high strength and corrosion resistance.

Other Industrial Applications:
Used in the manufacture of large storage tanks, liquefied petroleum gas cylinders, turbine casings, and other structural components that require high pressure and complex stress resistance.
Applicable to infrastructure projects requiring high strength and durability, such as bridges and heavy machinery components (though primarily used for pressure vessels).

GB713 Q345R Boiler steel plate,GB713 Q345R Pressure Vessel Steel plate, GB713 Q345R Storage Tanks Steel plate. GB713 Q345R Heat Exchanger Steel Plate .

UT(Ultrasonic examination), AR(As Hot Rolled only), TMCP(Thermal Mechanical Control Processing), N(Normalized), Q+T(Quenched and Tempered),Z Direction Test(Z15,Z25,Z35), Charpy V-Notch Impact Test, The Third Party Test (such as SGS Test), Coated or Shot Blasting and Painting.

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What is Q345R equivalent to?

Q345R astm equivalent materail is A516 Grade 70 steel, and it is Q345R equivalent ASTM material.

What is Q345 material?

Q345 is a low-alloy, high-strength structural steel composed of approximately 98-99% iron and 1-2% alloying elements such as carbon, manganese, silicon, and trace amounts of other elements like phosphorus and sulfur. It is typically available in solid, flat, or plate forms and has a greyish-metallic appearance.

What is the difference between Q245R and Q345R?

Q245R has better weldability (Ceq < 0.45%) due to lower manganese, reducing crack formation during welding. Q345R's higher Ceq (~0.47%) increases hardening tendency and crack risk, requiring careful welding precautions (e.g., preheating, low-hydrogen electrodes).

What is the difference between Q345R and Q345B?

1. Q345B material: It is a low carbon alloy steel (c <0.2%), with good comprehensive performance, good low temperature performance, cold stamping performance, welding performance and machinability.

2. Q345R material: It is a special plate for pressure vessels with a yield strength of 345MPa.

What is the difference between Q355 and Q345?

Mechanical Properties
Generally, Q345 steel has a tensile strength range of 470-630 MPa, while Q355 steel has a tensile strength range of 470-680 MPa. This indicates that Q355 has a potentially higher tensile strength than Q345.