Hot rolled carbon alloy steel plates/sheets and alloy structural steel plates are critical materials in industrial manufacturing, construction, and machinery, valued for their balanced strength, toughness, and processability. Below is a detailed overview of their definitions, properties, production, and applications:

 

Mechanical & Physical Properties

These plates balance strength, toughness, and processability, with properties tailored by alloy content and heat treatment:

Mechanical Properties

Tensile Strength: 400–1200 MPa (varies by grade; e.g., low-alloy grades like Q355B ~470 MPa; high-alloy grades like 42CrMo ~1080 MPa).

Yield Strength: 235–900 MPa (critical for structural applications to resist deformation under load).

Elongation: 15–30% (hot rolling ensures good ductility, enabling bending, forming, and welding).

Impact Toughness: 27–100 J (at room temperature; some grades retain toughness at low temps, e.g., -40°C for cryogenic use).

Hardness: 120–300 HB (can be increased via heat treatment like quenching+tempering).

 

 

 

 

 

 

 

 

 

 

Key Grades & Standards

Alloy structural steel plates follow global standards, with grades defined by chemical composition and mechanical requirements:

 

Standard	Typical Grades	Key Applications
GB/T 1591 (China)	Q355B/C/D, Q460C/D, 16Mn, 15CrMo	Bridges, machinery frames, pressure vessels
ASTM A572 (USA)	Grade 50, 60, 65	Construction (buildings, bridges), truck frames
EN 10025 (Europe)	S355JR/J0/J2, S460N/M	Structural components, offshore platforms
JIS G3106 (Japan)	SM490A/B, SN490B	Shipbuilding, industrial machinery

 

 

 

 

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 Hot Rolled Carbon Alloy Steel Plate/Sheet Alloy Structural 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.
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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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