The "Origin Mystery" of S355JR Steel Plate

As a low-alloy high-strength structural steel under the European standard EN 10025, S355JR steel plate has a  (grade) with profound meaning:

 

"S" stands for Structural Steel, marking its identity in the steel family.

"355" indicates a minimum yield strength of 355 MPa, a critical indicator of the steel's load-bearing capacity.

"JR":

"J" denotes impact testing;

"R" specifies room temperature (20℃) impact testing, with the steel delivered in a hot-rolled state.

Production Process: A Blend of Precision and Craftsmanship

Smelting:
Using electric arc furnaces or converters, raw materials are carefully blended, and impurities are removed to ensure the molten steel meets high-purity standards. This step lays the foundation for the steel's mechanical properties.

Rolling:
Steel billets are shaped into the required dimensions through multi-pass rolling at high temperatures. Precise control of the rolling process directly influences the steel's internal microstructure and final performance, such as grain refinement for improved strength.

Post-Processing (Optional):
Heat treatment (e.g., quenching, tempering) may be applied to further optimize properties like hardness and toughness, tailoring the steel to specific engineering needs.

The "Unique Charms" of S355JR Steel Plate

(1) High Strength: A Reliable Workhorse

With a minimum yield strength of 355 MPa, S355JR excels in heavy-load applications:

 

In Construction:

Serves as the "backbone" of buildings, such as beams and columns in high-rise frameworks, bearing vertical and horizontal loads.

Used as roof beams and crane girders in industrial workshops to support heavy machinery operations.

(2) Excellent Toughness: Resilient to Impact

Tested at room temperature (20℃), S355JR demonstrates superior energy absorption capacity, resisting brittle fracture under dynamic loads:

 

In Bridge Engineering:
Effectively cushions (impact forces) and vibrations from passing vehicles, reducing structural damage risks and extending the bridge's service life.

(3) Weldability and Machinability: Engineer-Friendly Traits

S355JR's excellent processability makes it a favorite in construction:

 

Welding:
Compatible with common techniques like arc welding and gas shielded welding, forming strong, ductile joints that meet engineering standards.

 

 

 

 

 

 

 

 

 

 

 

 

Grade	Mechanical Property
	Tensile Strength(MPa)	Yield Strength(MPa)	% Elongation in 2 in.(50mm) min	Impacting Test Temperature(°C)
S355jr	400-520	235	22	20

 

 

 

Why Choose Us?
We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our S355jr Alloy Steel Plate, and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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