Here is a detailed introduction to S355JR steel plate:

Standard and Grade Meaning12

Standard: It complies with the European standard EN 10025 - 2.

Grade Meaning: "S" represents structural steel, "355" indicates that the minimum yield strength of the steel plate is 355 MPa, "J" represents the impact toughness grade of the steel, and "R" often means that the impact toughness of the steel is tested at room temperature, or in some cases, it represents the delivery state of the steel, such as hot - rolled.

 

Typical Application Scenarios47

Construction Field: It is commonly used in the beams, columns, and floor slabs of high - rise buildings, factory buildings, bridges, and other building structures.

Shipbuilding Field: It can be used to make the deck, bulkhead, truss, and other structural components of ships.

Mechanical Manufacturing Field: In the mechanical manufacturing industry, it is widely used to make the structural parts of various heavy - duty machinery and equipment, such as drilling rigs, electric shovels, and excavators.

Vehicle Manufacturing Field: It can be used to make the chassis, frame, and other components of vehicles such as cars, trains, and trucks. It is also used in the manufacturing of petroleum - chemical equipment, pressure vessels, pipelines, and other fields.

Processing and Welding Points

Hot - Working Performance: It is delivered in a hot - rolled state and can be directly cut and drilled without pre - heating when the thickness is ≤ 30 mm. After flame cutting, the oxide scale should be removed to avoid stress concentration.

Welding Process: The selection of welding electrodes should be low - hydrogen - type electrodes. The pre - heating requirements are that pre - heating is generally not required when the thickness is ≤ 25 mm and the ambient temperature is ≥ 0 °C; for thick plates or in low - temperature environments (＜ 0 °C), pre - heating to 50 - 100 °C is required to prevent cold cracks.

Surface Treatment: The default surface of the steel plate is hot - rolled oxide scale. When it is used in a corrosive environment, shot blasting and rust removal (grade Sa2.5) are required, and then an anti - corrosion coating (such as epoxy resin paint) should be applied.

Alternative Grades and Standard Comparisons1

In the Chinese standard, the equivalent grade is Q345B; in the German standard DIN 17100, it is ST52 - 3. When considering alternative grades, the three core indicators of tensile strength, impact temperature, and carbon equivalent should be compared.

 

 

 

Product Name	Hot rolled hsla steel plate
Standard	ASTM ASME EN BS DIN JIS GB ISO
Material	A572 S275JO 50A St50-2 SM520 Q390 Fe510
Surface	Skin Pass
Shape	Plate and Coil
Certificate	ISO 9001:2008/SGS/BV
Usage	heavy transporters, offshore industry

 

 

 

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