JIS G3101 SS540 Carbon and Low-alloy High-strength Structural Steel
JIS G3101 SS540 Carbon and Low-alloy High-strength Structural Steel - Properties & Data
Complete technical data for SS540 steel per JIS G3101, including chemical composition, mechanical and physical properties, international equivalents, and application guide.
Hot rolling, cold forming, welding, machining, cutting
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
JIS G3101 SS540 Carbon and Low-alloy High-strength Structural Steel Introduction
SS540 is a carbon and low-alloy high-strength steel grade specified in the Japanese Industrial Standard JIS G3101 for Rolled steels for general structure. It is characterized by a minimum tensile strength of 540 MPa and a minimum yield strength of 400 MPa (for thicknesses up to 40 mm). The steel offers good weldability and formability, making it suitable for heavy structural applications where higher load-bearing capacity is required. It is typically supplied in the as-rolled condition, with chemical composition controlled mainly by phosphorus and sulfur limits. SS540 is widely used in construction, bridges, shipbuilding, machinery, and transportation equipment.
JIS G3101 SS540 Carbon and Low-alloy High-strength Structural Steel Chemical Composition
Per JIS G3101, only phosphorus and sulfur contents are explicitly restricted for SS540. Carbon, manganese, silicon, and other alloying elements are not standardized but are adjusted by the manufacturer to meet the required mechanical properties. Typical ladle analysis values for carbon‑manganese structural steels may be C ≤ 0.30%, Mn ≤ 1.60%, but these are not normative.
| Element | Standard Value | Remarks |
|---|---|---|
| Phosphorus (P) | ≤ 0.050% | Maximum limit per JIS G3101 |
| Sulfur (S) | ≤ 0.050% | Maximum limit per JIS G3101 |
JIS G3101 SS540 Carbon and Low-alloy High-strength Structural Steel Thermal and Electrical Physical Properties
JIS G3101 does not specify thermal or electrical physical properties for SS540. The values below are typical for similar carbon‑manganese structural steels (approx. 0.20% C, 1.40% Mn) and may vary with exact composition and heat treatment. They are provided for general reference only and are not part of the standard.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 210 | GPa | Ambient temperature |
| Shear Modulus (G) | 80 | GPa | Typical for carbon steel |
| Poisson's Ratio (ν) | 0.3 | – | Elastic range |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20–100 °C |
| Thermal Conductivity (λ) | 52 | W/(m·K) | At 100 °C |
| Specific Heat Capacity | 500 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρ_e) | 0.20 | µΩ·m | At 20 °C |
JIS G3101 SS540 Carbon and Low-alloy High-strength Structural Steel Mechanical Properties
Mechanical properties are taken from JIS G3101:2015 and are valid for test specimens in the as‑rolled condition, unless otherwise agreed. Yield point (ReH) and tensile strength (Rm) vary by thickness range. Elongation (A) is measured using JIS test pieces No. 5 or No. 1A. Bend test requires 180° bending without cracking at the specified inner radius.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Point (ReH) | ≥ 400 | MPa | Thickness ≤ 16 mm |
| Yield Point (ReH) | ≥ 400 | MPa | Thickness 16–40 mm |
| Yield Point (ReH) | ≥ 390 | MPa | Thickness 40–100 mm |
| Tensile Strength (Rm) | ≥ 540 | MPa | All thicknesses |
| Elongation (A) | ≥ 16 | % | Thickness ≤ 5 mm, JIS No. 5 test piece, gauge length 50 mm |
| Elongation (A) | ≥ 13 | % | Thickness 5–16 mm, JIS No. 1A test piece, gauge length 200 mm |
| Elongation (A) | ≥ 15 | % | Thickness 16–50 mm, JIS No. 1A test piece, gauge length 200 mm |
| Bend Test (180°) | Inner radius 1.5t (no cracks) | – | Thickness ≤ 16 mm, t = specimen thickness |
| Bend Test (180°) | Inner radius 2.0t (no cracks) | – | Thickness 16–100 mm, t = specimen thickness |
JIS G3101 SS540 Carbon and Low-alloy High-strength Structural Steel Completely Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-2 | S460JR / S460J0 / S460J2 | Comparable minimum yield (460 MPa) and tensile (540–720 MPa) properties. Impact properties vary by sub‑grade. |
| USA | ASTM A572/A572M | Grade 65 [450] | Similar strength (Tensile 550 MPa min, Yield 450 MPa). Different chemical and toughness requirements. |
| China | GB/T 1591 | Q460D | High‑strength low‑alloy structural steel with minimum yield 460 MPa and tensile 550–720 MPa. |
| International | ISO 630‑2 | E460C (Fe 590) | General‑purpose structural steel, minimum yield 460 MPa, tensile 540–720 MPa. |
JIS G3101 SS540 Carbon and Low-alloy High-strength Structural Steel Application Introduction
SS540 is a workhorse high‑strength structural steel used where weight savings or higher load capacity are needed. It is readily weldable and can be cold‑formed. The following industries and product forms illustrate its typical uses.
Product Applications: Hot‑rolled coils, cut‑to‑length plates, and sheets, Structural shapes: H‑beams, I‑beams, channels, angles, and hollow sections, Welded pipes and tubes (structural grade), Prefabricated components for steel‑framed buildings, Bridge girders and box sections, Pressure vessel shells (if qualified under separate product standards)
Processed into products: Bridge bearing plates and stiffeners, Crane booms, arms, and turntables, Heavy‑duty vehicle chassis and sub‑frames, Excavator buckets and structural arms, Support columns and trusses in high‑rise buildings, Offshore platform bracings and decks, Ship hull plating and longitudinal stiffeners
Application industries: Construction and civil engineering (high‑rise buildings, stadiums, bridges), Shipbuilding and marine structures (hulls, decks, offshore platforms), Heavy machinery and equipment (cranes, excavators, bulldozers), Transportation (truck frames, railway wagons, trailers), Energy (wind turbine towers, pressure vessels, storage tanks), Industrial structures (conveyor systems, machine frames)
JIS G3101 SS540 Carbon and Low-alloy High-strength Structural Steel Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3101 | SS490 | Lower strength (tensile ≥ 490 MPa, yield ≥ 285 MPa) – suitable for less demanding structures. |
| Japan | JIS G3106 | SM490A / SM490B | Weldable structural steel, tensile 490–610 MPa, yield ≥ 325 MPa. Better toughness. |
| Japan | JIS G3106 | SM520B / SM520C | Higher tensile (520–640 MPa) and yield (≥ 365 MPa) with improved weldability. |
| Europe | EN 10025-2 | S355J2 | Significantly lower strength (tensile 470–630 MPa, yield 355 MPa) – widely used alternative where high strength is not critical. |
| USA | ASTM A36/A36M | A36 | Much lower strength (yield 250 MPa, tensile 400–550 MPa); not a direct substitute for high‑stress applications. |
Notes:
Weldability: SS540 does not have a specified carbon equivalent, so for thicker sections (>25 mm) it is advisable to use low‑hydrogen processes and pre‑heat to avoid cold cracking.
Corrosion resistance: As a plain carbon‑manganese steel, SS540 is not designed for atmospheric corrosion resistance – protective coatings are required in aggressive environments.
Availability: SS540 is typically available ex‑stock from Japanese mills and major Asian distributors in thicknesses from 1.6 mm to 100 mm, widths up to 2500 mm for plates and coils.
Certification: Mill test certificates (MTC) according to EN 10204 type 2.2 or 3.1 are common.
- Share
