Q235B is a widely used carbon structural steel in China, belonging to the Q235 series (where "Q" stands for "Qu" in Chinese, meaning yield strength). It is known for its good comprehensive performance, affordability, and ease of processing, making it a staple in construction, machinery manufacturing, and other industrial fields. Below is a detailed overview of Q235B carbon steel:

1. Chemical Composition

The chemical composition of Q235B is strictly regulated to ensure its mechanical properties. According to Chinese standard GB/T 700-2006, the typical composition ranges are:

 

Element	Content Range (%)	Role
Carbon (C)	≤0.20	Improves strength but excessive content reduces weldability and toughness.
Silicon (Si)	≤0.35	Enhances strength and deoxidation during smelting.
Manganese (Mn)	≤1.40	Increases strength and toughness without significantly reducing weldability.
Phosphorus (P)	≤0.045	Harmful impurity; excessive P causes brittleness, especially at low temperatures.
Sulfur (S)	≤0.045	Harmful impurity; excessive S leads to hot brittleness and poor weldability.
Others	Trace amounts (e.g., N, O)	Controlled to avoid adverse effects on performance.

2. Mechanical Properties

Q235B's mechanical properties are defined by its yield strength, tensile strength, elongation, and impact toughness, which determine its suitability for structural applications:

 

Yield strength (Rel): ≥235 MPa (hence the "235" in its name). This is the stress at which the material begins to deform plastically.

Tensile strength (Rm): 375–500 MPa. The maximum stress the material can withstand before breaking.

Elongation after fracture (A): ≥26%. Indicates the material's ductility (ability to deform before breaking).

Impact toughness: Requires Charpy V-notch impact testing at 20°C, with an average energy ≥27 J. This ensures it maintains toughness in moderate temperature environments.

 

 

 

 

 

 

 

 

 

 

 

 

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 Q235b Carbon Steel, 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.

Hot Tags: q235b carbon steel, China q235b carbon steel suppliers, factory, 2 4817, 2 4856, Inconel600, Inconel825, N06600, Nickel based Alloy