ASTM A36 Steel Density & Weight Reference: All Units, Equivalents & Plate Specs

ASTM A36 Steel Density — Quick Answer

The density of ASTM A36 steel is 7.85 g/cm³ (7850 kg/m³).

All unit conversions:

• g/cm³: 7.85
• kg/m³: 7,850
• lb/in³: 0.284
• lb/ft³: 490
• lb/yd³: 13,230

This density value applies to all A36 steel products: plate, bar, beam, channel, and structural shapes.

This guide covers ASTM A36 steel density, equivalent grades (S235JR, SS400, Q235B), chemical composition, mechanical properties, and applications , helping buyers and engineers quickly compare materials and select the right option for international projects.

For sourcing and specification matching, understanding A36 equivalent material and performance differences is essential in global steel procurement.

Table of Contents

• Equivalent Materials
• Density of A36 Steel
• Chemical Composition
• Mechanical Properties
• Common Dimensions and Weight
• Practical Applications
• FAQ

ASTM A36 Equivalent Grades (S235JR, SS400, Q235B) – Comparison Guide

Buyers sourcing steel internationally often compare ASTM A36 equivalent grades to ensure material interchangeability and compliance with local standards.

Standard	Equivalent Grade	Notes
ASTM (USA)	A36	Baseline reference
EN (Europe)	S235JR	Very similar performance, often interchangeable
JIS (Japan)	SS400	Yield strength slightly lower; check project requirements
GB (China)	Q235B	Common Chinese equivalent

In global sourcing, ASTM A36 equivalent material selection depends on project standards, cost targets, and availability.

• S235JR is the closest equivalent to ASTM A36 in yield strength and is widely accepted in European projects.
• SS400 is commonly used in Asia, with slightly lower yield strength, suitable for general structures.
• Q235B is a cost-effective alternative frequently used in China and export markets.

When strict compliance or certification is required, ASTM A36 should be specified directly. For cost-sensitive procurement, A36 equivalent grades are often accepted after technical review.

ASTM A36 Steel Density — Complete Unit Reference

The density of ASTM A36 steel is 7.85 g/cm³, consistent across all product forms including plate, coil, bar, and structural profiles.

A36 Steel Density in All Units

Unit System	Density Value
g/cm³ (metric)	7.85
kg/m³ (metric)	7,850
lb/in³ (imperial)	0.284
lb/ft³ (imperial)	490
lb/yd³ (imperial)	13,230
tonnes/m³	7.85

Why A36 Density Matters for Procurement

Knowing the exact A36 steel density is essential for:

1. Weight calculation before ordering
Use the formula: Weight (kg) = Length (m) × Width (m) × Thickness (mm) × 7.85

Example: A 2000mm × 1000mm × 10mm A36 plate weighs: 2 × 1 × 10 × 7.85 = 157 kg

→ Use our Steel Plate Weight Calculator (kg, lb, tonne) for instant results.

2. Freight cost estimation
International shipping charges are weight-based. Accurate density input prevents costly miscalculations on FOB or CIF quotes.

3. Structural load calculations
Engineers use A36 density to calculate dead loads in beams, columns, and platforms.

A36 Steel Density vs Other Common Grades

Steel Grade	Density (g/cm³)	Comparison to A36
ASTM A36	7.85	Baseline
S235JR (A36 equivalent)	7.85	Identical
SS400 (A36 equivalent)	7.85	Identical
Q235B (A36 equivalent)	7.85	Identical
ASTM A572 Grade 50	7.85	Identical
Stainless Steel 304	7.93	+1% heavier
Aluminum 6061	2.70	66% lighter

All carbon and low-alloy structural steels share the same density of 7.85 g/cm³. Grade selection should be based on strength and weldability, not density differences.

For a broader comparison across popular carbon steel plates, see also: A36 vs A283 vs A572 vs A516 Steel Plate: Key Differences and Equivalents

ASTM A36 Chemical Composition

The typical A36 steel chemical composition ensures both strength and excellent weldability, making it one of the most preferred grades in the carbon steel category.

Element	Content (%)
Carbon (C)	≤ 0.25
Manganese (Mn)	0.80 – 1.20
Phosphorus (P)	≤ 0.04
Sulfur (S)	≤ 0.05
Silicon (Si)	0.15 – 0.40

*The low carbon content (<0.25%) in ASTM A36 steel significantly enhances weldability, while manganese (0.80–1.20%) increases tensile strength without compromising ductility. These factors make the ASTM A36 chemical composition highly suitable for structural fabrication.

ASTM A36 Steel Plate Mechanical Properties

The A36 steel properties make it a versatile and cost-effective choice for structural and fabrication purposes:

Property	Value
Tensile Strength	400 – 550 MPa
Yield Strength	≥ 250 MPa
Elongation	≥ 20%

*These ASTM A36 steel properties ensure that it can be easily welded, machined, and formed. The yield strength of A36 steel plate allows it to perform reliably in beams, channels, and platforms. Its mechanical balance supports a wide range of applications where toughness and ductility are required.

Practical Applications of ASTM A36 Steel Plate

1. Construction and Infrastructure

• Used for beams, columns, platforms, brackets, and flooring.
• A36 Checkered Steel Plate is preferred for flooring due to its anti-slip surface.
• A36 Carbon Steel U Channel, A36 Carbon Steel C Channel, and A36 Carbon Steel I-Beam support structural frames efficiently.

2. Shipbuilding and Offshore Structures

A36 shipbuilding plates are suitable for secondary decks and non-critical structures. For main hulls, high-strength or corrosion-resistant grades are preferred.

3. Machinery and Industrial Equipment

• Tanks, equipment bases, and fabricated components use A36 Carbon Steel Plate and A36 Carbon Steel Coil.
• A36 Steel Round Bar is supplied for shafts and fasteners.

FAQ

• Q1: What is the density of A36 steel in lb/in³?
  The density of ASTM A36 steel is 0.284 lb/in³ (equivalent to 7.85 g/cm³ or 490 lb/ft³).
• Q2: What is the density of A36 steel in kg/m³?
  ASTM A36 steel density is 7,850 kg/m³.
• Q3: Is the density of A36 steel the same as mild steel?
  Yes. ASTM A36 is a mild steel grade, and its density of 7.85 g/cm³ is the standard value for all mild and low-carbon structural steels, including S235JR, SS400, and Q235B.
• Q4: What is ASTM A36 equivalent material?
  ASTM A36 equivalent material includes EN S235JR, JIS SS400, and GB Q235B. These grades have similar chemical composition and mechanical properties and are widely used as substitutes in international projects, depending on local standards and availability.
• Q5: Is ASTM A36 the same as S235JR?
  ASTM A36 and S235JR are not identical but are considered very close equivalents. Both have similar yield strength (around 235–250 MPa) and are commonly interchangeable in structural applications after engineering confirmation.
• Q6: Is A36 steel the same as Q235B?
  A36 steel and Q235B are similar structural carbon steels, but they follow different standards (ASTM vs GB). Q235B is often used as a cost-effective alternative to A36 in global procurement, especially for general construction.
• Q7: Is ASTM A36 equivalent to SS400?
  Yes, SS400 is a commonly accepted equivalent to ASTM A36. However, SS400 may have slightly lower yield strength, so it is typically used for general structural applications rather than critical load-bearing structures.

Conclusion

ASTM A36 steel remains one of the most versatile and economical materials for global structural projects. Its balanced A36 steel properties, wide availability, and compatibility with multiple A36 material equivalent grades make it a reliable choice for engineers and fabricators worldwide.

For international projects, choosing the right ASTM A36 steel or its equivalent depends on availability, standards, and cost considerations.

We supply export-ready A36 steel plates with flexible sizing, third-party inspection, and global delivery support.

Feel free to contact our team for support.