BS 4360 Grade 40A Steel Plate supplier

BS 4360 Grade 40Ais a carbon structural steel grade defined under the now-withdrawn British Standard BS 4360:1986. Though superseded by EN 10025 standards, it remains in common use across global markets, especially for general structural purposes where good strength, weldability, and toughness are required. This material is often used in the fabrication of steel structures, civil engineering projects, bridges, and welded construction.

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1. BS 4360 40A General Description

Grade 40A Materialis part of the BS 4360 structural steel series, with “40” indicating a minimum tensile strength range of around 400 MPa, and “A” representing the quality grade. This steel is designed for structural engineering and construction purposes and is especially known for:

• Moderate tensile strength
• Good weldability
• Suitable cold and hot forming
• Fair machinability
• Balanced cost-performance ratio

It is a non-alloy carbon steel with properties suitable for welding, bending, and forming, making it a cost-effective choice for infrastructure development.

2. bs4360 gr 40a Chemical Composition (Max Values)

The typical chemical composition of BS 4360 Grade 40A is as follows:

Note: The steel is intended for welding. Low carbon content ensures good weldability and reduces the risk of cold cracking.

3. Grade 40A steel properties Mechanical Properties

Mechanical performance is crucial for structural applications. The typical mechanical properties of BS 4360 40A are:

Mechanical values may vary slightly based on plate thickness and processing conditions.

4. BS4360 40A Equivalent Grades Comparison

Though BS 4360 has been officially withdrawn, the material is still used worldwide under equivalent or replacement grades:

Always check with a technical engineer before substituting materials in critical applications.

5. Steel grade 43A equivalent Typical Applications

BS 4360 Grade 40A is widely used in industries where moderate strength and good formability are required. Common applications include:

• Steel frameworks in buildings and warehouses
• Construction of bridges and towers
• Equipment structures and fabrication
• Agricultural and industrial machinery
• Shipbuilding components
• General fabrication and light engineering

This steel is popular in regions that still rely on BS standards or in export markets where older standards are accepted.

6. BS 4360 40A Fabrication and Processing Features

• Weldability: Excellent weldability with all conventional welding methods such as MIG, TIG, and arc welding. No pre-heating usually required.
• Formability: Good cold forming and bending properties; suitable for press braking and rolling.
• Machinability: Reasonable machinability, especially in normalized or as-rolled condition.
• Heat treatment: Can be normalized to improve toughness and consistency but not generally used for quenching or tempering.

7. Product Forms/Bs4360 40a dimensions Available

BS 4360 40A is typically available in the following forms:

• Hot Rolled Steel Plates
• Structural Beams and I-beams
• Steel Angles and Channels
• Pipes and Hollow Sections
• Cut-to-size custom blanks

Thicknesses commonly range from 6mm to 100mm, with customizable width and length options available.

8. Frequently Asked Questions (FAQ)

Q1: Is BS 4360 40A still valid?
BS 4360 is no longer an active standard, but Grade 40A is still widely referenced and accepted in global markets, especially in export business.

Q2: Is BS 4360 40A the same as S275JR?
They are generally considered equivalent. S275JR is the modern EN 10025-2 replacement, with comparable chemical and mechanical properties.

Q3: Can I weld 40A without pre-heating?
Yes. Its low carbon content ensures good weldability without the need for pre- or post-heat treatment in most conditions.

Q4: What is the price of BS 4360 40A steel plate?
Prices vary by market and order quantity. As of recent export data, typical FOB pricing is USD 600–750/MT depending on size, thickness, and finish.

Q5: What certificates are available with this steel?
Mill test certificates (MTC EN 10204 3.1), inspection reports, and origin certificates are commonly provided for export shipments.

9. How to buy BS 4360 40A?

BS 4360 Grade 40A remains a practical and economical structural steel for non-critical applications and export projects. It balances cost, weldability, and sufficient strength to meet general construction and fabrication requirements. Despite being an older grade, its equivalency to modern EN and ASTM standards makes it a valuable option in global steel supply.
You can contact Gangsteel for this grade.