Q345R low alloy pressure vessel steel

GB713 Q345R is a professional plate for containers, which requires non-destructive testing. Its yield strength is 345MPA, with slight changes in chemical composition, and has good comprehensive properties. It is a material specially used for manufacturing containers.

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Product Description

1.What are the chemical composition of GB713 Q345R low alloy pressure vessel steel?

Q345R Chemical composition% of the Product analysis of grade
Grade	C %	Si %	Mn %	Cu%	Ni %	Cr%	Mo %	V%
Q345R	0.20	0.55	1.2-1.7	0.30	0.30	0.30	0.08	0.050
	T1%	Alt %	P%	S%	Nb%
	0.030	0.020	0.025	0.010	0.050

2.What are the main differences between Q345 and Q345R?

Application Purpose

Q345	Q345R
General structural steel – Used for general engineering structures (e.g., bridges, buildings, mechanical components).	Specialized pressure vessel steel – Specifically designed for manufacturing pressure vessels (e.g., boilers, reactors, tanks) that withstand high pressure and medium

Technical Standards

Q345	Q345R
– Standard: GB/T 1591 (Low-alloy high-strength structural steel). – Belongs to “structural steel” category.	– Standard: GB 713 (Steel plates for boilers and pressure vessels). – Classified as “pressure vessel steel” with stricter safety requirements.

Manufacturing and Testing Requirements

Q345	Q345R
– Simple production process. – No strict requirements for flaw detection or heat treatment.	– Strict quality control: – Requires ultrasonic flaw detection to ensure no internal defects. – Often subjected to normalization heat treatment to improve microstructure and uniformity. – Mandatory chemical analysis, tensile testing, and impact testing for ev

Delivery Status

Q345: Usually delivered in hot-rolled state.

Q345R: Commonly delivered in normalized state (to enhance mechanical properties for pressure-bearing applications).

3.What is GB713 Q345R equivalent material?

The GB713 Q345R equivalent ASTM material is A516 Grade 70 in specification of ASTM A516/A516M.

4.What is Q345R material and what are its properties?
Q345R is a low-alloy high-strength steel plate, specifically suitable for manufacturing boilers and pressure vessels. It has the following properties:

High-temperature performance:
Q345R maintains good yield strength at high temperatures. For example, it can still retain a high level of yield strength at 500°C.

Corrosion resistance:
Q345R steel plates undergo special treatment, enabling them to remain stable in various corrosive media and less prone to corrosion reactions.

Weldability:
Q345R has excellent weldability and can be matched with various welding materials and processes, facilitating processing and assembly during manufacturing.

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