Q235B Carbon Structural Steel Plate

Q235B is a widely used carbon structural steel plate in various structural engineering applications. Its primary chemical composition includes controlled levels of carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S), which collectively ensure its balanced strength and toughness for diverse engineering needs.

Chemical Composition (mass fraction)

Carbon (C): ≤ 0.22%

Silicon (Si): ≤ 0.35%

Manganese (Mn): ≤ 1.40%

Phosphorus (P): ≤ 0.045%

Sulfur (S): ≤ 0.045%

 

These compositions provide Q235B with suitable mechanical properties, such as yield strength and ductility, making it ideal for non-critical to moderately loaded structural components.

Double-Slag Retention Process

A notable steelmaking technique for Q235B and similar carbon steels is the double-slag retention method, which enhances refining efficiency and furnace performance:

Process Overview

Retain Final Slag: At the end of a heat, a portion of the high-basicity, high-FeO (iron oxide), high-temperature, and fluid final slag is retained in the furnace.

Next Heat Preparation:

Before charging hot metal, scrap steel is added to thicken and solidify the retained slag.

Hot metal is charged only when no liquid slag remains in the furnace to prevent splashing during charging.

First-Stage Blowing: During the next heat, the retained slag is reactivated in the early stage of blowing, forming a new slag layer rapidly.

Key Advantages

Accelerated Slag Formation: The retained slag provides a preconditioned slag phase, speeding up the formation of the initial slag in the subsequent heat.

Enhanced Phosphorus and Sulfur Removal: The high-basicity slag from the previous heat improves dephosphorization (P removal) and desulfurization (S removal) efficiency in the early blowing stage.

Energy and Material Savings: Reduces lime consumption and improves heat efficiency by leveraging residual heat and chemical components in the retained slag.

Furnace Lining Protection: The stable slag layer helps protect the furnace lining from thermal and chemical erosion.

Safety and Operational Notes

Scrap Steel Addition: Critical to solidify residual liquid slag and prevent violent reactions (e.g., splashing) when hot metal is charged.

Temperature Control: Proper management of slag temperature and viscosity is essential to ensure slag fluidity and refining performance in subsequent heats.

 

This method is widely adopted in modern steelmaking for its efficiency and sustainability, particularly in producing carbon structural steels like Q235B for construction and mechanical applications.

 

 

 

 

Specification we supply：

Thickness	3-200mm
Width	1500-4000mm
Length	5000-15000mm

 

 

 

 

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Our Cold-rolled Steel products are known for their durability and reliability.
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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