ASTM A36 vs Q235B: Unveiling the Key Differences

ASTM A36 vs. Q235B Unveiling the Key Differences

A36 is similar to Q235B, but there are differences between A36 and Q235B as follows:

1. Different yield points (A36 = 250MPa, Q235B = 235MPa);

2. Different tensile strengths (A36 = 400-550MPa, Q235B = 375-500MPa);

3. Different requirements for element content: (A36: C≤0.25%, Si≤0.4%, P≤0.04%, S≤0.05%; Q235B: C=0.12-0.2%, Si≤0.3, P≤0.045%, S≤0.045%).

Q235 has requirements for manganese content (Mn = 0.30-0.70%), while A36 has no requirements for manganese content.

If only comparing the mechanical properties of the materials, A36 is considered to have similar mechanical properties to high-quality carbon structural steel 20#. The tensile strength of 20# steel is not less than 410, and the yield strength is not less than 245, which is similar to the mechanical properties of A36.

Comparison of A36, SS400, and Q235

1. Different standardization organizations:

A36 is a material standard of the American Society of Mechanical Engineers (equivalent to ASTM specifications), SS400 is a material standard of the Japanese Industrial Standards (JIS G3101), and Q235 is a material standard of the Chinese National Standards (GB700).

2. Different chemical compositions:

Chemical composition comparison table for A36, SS400, and Q235:

In A36, the content of Mn element is not used due to different plate thicknesses (or round steel diameters). For thicknesses below 20mm, Mn is not included. Q235 has requirements for the content of C, Si, Mn, S, P, while SS400 only requires S and P to be less than 0.050, with no other requirements.

3. Different material mechanical properties:

The tensile strength of A36 is 58-80 Ksi (approximately 400-550MPa), and the yield strength is 36 Ksi (approximately 250MPa);

The tensile strength of Q235 is 370-500 MPa, and the yield strength is 235MPa;

The tensile strength of SS400 is 400-510 MPa, and the yield strength is 245MPa.

(Both SS400 and Q235 mechanical properties are given as examples for steel plate thicknesses less than 16mm.)

From the above data, it can be seen that the material names of ASME standard A36 and Chinese standard Q235 are based on the yield strength of the material, while SS400 is named based on the tensile strength of the material. From the analysis of material mechanical properties, A36 is equivalent to SS400, while Q235 is slightly inferior in terms of material properties.

4. Substitution of A36, SS400, and Q235:

Although Q235 has slightly inferior mechanical properties compared to A36 and SS400, in practical operations, as long as the owner does not explicitly require it, these three materials can often be used interchangeably.

If only comparing the mechanical properties of the materials, I believe that A36 and SS400 have similar mechanical properties to high-quality carbon structural steel 20#. The tensile strength of 20# steel is not less than 410, and the yield strength is not less than 245, which is similar to the mechanical properties of A36 and SS400.

SEPGrade of steelChemical composition mass fractions (%)
C(≤)Mn(≤)Si(≤)S(≤)P(≤)Cu(≤)
ASTMA360.26 –0.400.0500.0400.2 min
CHINAQ235-A0.14~0.220.3~0.650.300.0500.045 
CHINAQ135-B0.12~0.100.30~0.700.300.0450.045 
JISSS400 – – 0.0500.050 
Don't forget, sharing is caring! : )
Shane
Author

Shane

Founder of MachineMFG

As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.

Up Next

Mastering CAD/CAM: Essential Technologies Explained

Basic Concepts of Computer-Aided Design and Computer-Aided Manufacturing Computer-aided design and computer-aided manufacturing (CAD/CAM) is a comprehensive and technically complex system engineering discipline that incorporates diverse fields such as computer [...]

Virtual Manufacturing Explained: Concepts & Principles

Concept of Virtual Manufacturing Virtual Manufacturing (VM) is the fundamental realization of the actual manufacturing process on a computer. It utilizes computer simulation and virtual reality technologies, supported by high-performance [...]

Understanding Flexible Manufacturing Systems: A Guide

A Flexible Manufacturing System (FMS) typically employs principles of systems engineering and group technology. It connects Computer Numerical Control (CNC) machine tools (processing centers), coordinate measuring machines, material transport systems, [...]

Exploring 4 Cutting-Edge Nanofabrication Techniques

Just as manufacturing technology plays a crucial role in various fields today, nanofabrication technology holds a key position in the realms of nanotechnology. Nanofabrication technology encompasses numerous methods including mechanical [...]

Ultra-Precision Machining: Types and Techniques

Ultra-precision machining refers to precision manufacturing processes that achieve extremely high levels of accuracy and surface quality. Its definition is relative, changing with technological advancements. Currently, this technique can achieve [...]

Exploring High-Speed Cutting: Tech Overview & Application

Cutting machining remains the most prominent method of mechanical processing, holding a significant role in mechanical manufacturing. With the advancement of manufacturing technology, cutting machining technology underwent substantial progress towards [...]

Top 7 New Engineering Materials: What You Need to Know

Advanced materials refer to those recently researched or under development that possess exceptional performance and special functionalities. These materials are of paramount significance to the advancement of science and technology, [...]

Metal Expansion Methods: A Comprehensive Guide

Bulge forming is suitable for various types of blanks, such as deep-drawn cups, cut tubes, and rolled conical weldments. Classification by bulge forming medium Bulge forming methods can be categorized [...]
MachineMFG
Take your business to the next level
Subscribe to our newsletter
The latest news, articles, and resources, sent to your inbox weekly.
© 2024. All rights reserved.

Contact Us

You will get our reply within 24 hours.