ST3 Structural Carbon Steel Supplier, Manufacturer & Exporter in India
Russian Metals is a trusted supplier, manufacturer, and exporter of ST3 Steel (st 3 / Ст3 Steel), a widely used structural carbon steel grade. This low carbon steel ST3 is extensively used in construction, fabrication, engineering, and general structural applications.
Product Overview of ST3 Steel
ST3 Steel (Ст3 Steel) is a low carbon structural steel widely used in construction and general engineering applications. It is considered equivalent to S235JR and ASTM A36 in general mechanical performance comparison.
This weldable carbon steel grade offers good strength, excellent machinability, and high versatility, making it suitable for structural frameworks and fabrication work. Russian Metals supplies high-quality ST3 structural carbon steel for industrial and construction sectors.
- Low carbon structural steel
- Excellent weldability and formability
- Good structural performance
- Cost-effective engineering material
- S235JR / ASTM A36 equivalent
What is ST3 Steel?
ST3 Steel (Ст3 Steel) is a Russian low carbon structural steel grade designed for general construction and engineering purposes. It is known for its good weldability, ductility, and cost-effectiveness.
This mild steel grade ST3 is widely used in welded structures, beams, frames, and industrial fabrication where high strength alloy steel is not required.
- Low carbon content
- Excellent weldability
- Good formability
- Reliable structural performance
- Cost-effective engineering material
- Wide industrial usage
Why ST3 Steel Performs in Construction Applications
This low carbon structural steel provides excellent ductility and easy fabrication, is highly suitable for welding and structural assembly as a weldable carbon steel, is ideal for building and infrastructure projects as a construction steel grade, offers balanced strength and flexibility for engineering use, and is used in heavy fabrication and manufacturing industries as industrial structural steel.
Available Forms & Services — Russian Metals
We supply industrial-grade ST3 with MTC for reliable performance and complete traceability.
Available Forms & Processing Services
| Product / Service Type | Description |
|---|---|
| Plates & Sheets | Cut-to-size for tanks, machinery, and structures |
| Pipes & Tubes | Seamless & welded, tested and certified |
| Bars & Rods | Round, square, and custom lengths |
| Profiles | Angles, channels, beams for construction frameworks |
| Processing Services | CNC cutting, drilling, welding, bending, and finishing |
ST3 Steel Supply Range
Russian Metals supplies ST3 Structural Carbon Steel in multiple forms for construction, engineering, and fabrication applications.
Variants of ST3 Steel
Russian Metals supplies multiple variants and customized dimensions of ST3 steel products
Advantages of ST3 Steel
Engineered for construction and general engineering where weldability, cost-effectiveness, and structural strength are critical.
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Excellent weldability easy to fabricate and join in construction structures
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Cost effective material affordable solution for large-scale engineering projects
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Good structural strength reliable performance for building applications
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High availability widely used and easily sourced structural steel
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Versatile applications suitable for multiple industrial and construction uses
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Good formability and ductility for fabrication
Where ST3 Steel Is Used
From building frameworks to industrial fabrication, ST3 steel delivers reliable structural performance.
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Construction structures and building frameworks
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Bridges and infrastructure projects
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Industrial fabrication and machine frames
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Structural beams and welded assemblies
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General engineering projects and fabrication workshops
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Heavy equipment structures
Technical Specifications of ST3 Steel
Complete technical reference for engineers, buyers, and quality assurance teams.
Product Specifications of ST3 Steel
Product details, available forms, usage areas, and supply information.
| Specification | Details |
|---|---|
| Product Name | ST3 Steel (Ст3 Steel, ST3 structural carbon steel) |
| Brand | Russian Metals |
| Material Type | Carbon Steel / Structural Steel |
| Grade | ST3, Ст3, S235JR (approx), ASTM A36 (general reference) |
| Steel Classification | Low carbon structural steel / Weldable carbon steel / Mild steel grade ST3 |
| Available Forms | Plate, sheet, round bar, rod, pipe, tube, flat bar, structural beam, welded pipe, coil |
| Common Usage | Construction, building frameworks, bridges, industrial fabrication, machine frames, general engineering |
| Surface Finish | Bright, mill finish as required |
| Shape Options | Round, flat, plate, sheet, structural sections, custom components |
| Size Options | Custom sizes available as per requirement |
| Heat Treatment Condition | Hot rolled condition / Normalized condition / As rolled condition |
| Standard | GOST / Russian structural steel standards |
| Supply Type | Supplier, manufacturer, exporter and stockist |
| Price | ST3 steel price available on request |
| Customization | Available as per drawings, dimensions and application needs |
Equivalent & Comparable Grades
Always verify MTCs when substituting for critical projects.
ST3 Equivalent Grades
| Standard | Equivalent Grades |
|---|---|
| Standard | Equivalent Grades |
| EN | S235JR, S275JR (similar low-carbon structural steels) |
| ASTM / AISI | A36 (close mechanical profile) |
| DIN | St37-2, St44-2 |
Chemical & Mechanical Properties of ST3 Steel
Certified composition and performance metrics for ST3 low carbon structural steel according to GOST and international standards.
Characteristics of ST3 Steel
| Property | Value |
|---|---|
| Grade | ST3 (Ст3) - Low Carbon Structural Steel |
| Classification | Weldable carbon steel / Mild steel grade ST3 |
| Designation | Construction and industrial structural steel |
Chemical Composition in % for Grade 15 (15)
| C | Si | Mn | Ni | S | P | Cr | N | Cu | As |
|---|---|---|---|---|---|---|---|---|---|
| 0.14 - 0.22 | 0.15 - 0.3 | 0.4 - 0.65 | max 0.3 | max 0.05 | max 0.04 | max 0.3 | max 0.008 | max 0.3 | max 0.08 |
ST3 — Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| C | – | 0.20 |
| Si | – | 0.35 |
| Mn | 0.40 | 0.65 |
| S | – | 0.050 |
| P | – | 0.040 |
| Fe | Balance | Balance |
Mechanical Properties at 20°C for Grade St3sp (Ст3сп)
| Assortment | Dimension (mm) | Direct. | σB (MPa) | σT (MPa) | δ5 (%) | ψ (%) | KCU (kJ/m²) | Heat treatment |
|---|---|---|---|---|---|---|---|---|
| Pipe, GOST 8696-74 | - | - | 372 | 245 | 23 | - | - | - |
| Pipe, GOST 10705-80 | - | - | 372 | 225 | 22 | - | - | - |
| Rolled stock, GOST 535-2005 | - | - | 370 - 490 | 205-255 | 23-26 | - | - | - |
| Sheet trick, GOST 14637-89 | - | - | 370-480 | 205-245 | 23-26 | - | - | - |
| Rebar, GOST 5781-82 | - | - | 373 | 235 | 25 | - | - | - |
| Wire rods, GOST 30136-95 | - | - | 490-540 | - | 60 | - | - | - |
Brinell Hardness for St3sp (Ст3сп)
| Condition / Standard | HB 10⁻¹ (MPa) |
|---|---|
| St3sp (Ст3сп) | 121 |
Technological Properties for Grade St3sp (Ст3сп)
| Property | Value |
|---|---|
| Weldability | without limitations |
| Flakes | not predisposed |
| Temper brittleness | not predisposed |
Physical Properties for Grade St3sp (Ст3сп)
| T (°C) | E × 10⁻⁵ (MPa) | α × 10⁶ (1/°C) | λ (W/m·°C) | ρ (kg/m³) | C (J/kg·°C) | R × 10⁹ (Ω·m) |
|---|---|---|---|---|---|---|
| 20 | - | - | - | 7850 | - | - |
Mechanical & Physical Properties
| Property | Typical Values |
|---|---|
| Yield Strength (σ₀.₂) | ~235–345 MPa |
| Tensile Strength (σᵦ) | ~370–510 MPa |
| Elongation (δ5) | 22–25% |
| Impact Toughness | High even at sub-zero temperatures |
| Density | ~7.85 g/cm³ |
| Hardness | ~130–180 HB |
Control & Diagnostics of ST3 Steel
Every batch is tested to meet international and GOST industry standards.
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Chemical composition testing
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Mechanical strength testing
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Weldability evaluation
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Surface quality inspection
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Dimensional accuracy checks
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Ultrasonic testing (if required)
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Material traceability certification
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Compliance with GOST standards
Each product is inspected to ensure compliance with industrial and GOST quality standards.
Trusted Partner for ST3 Steel
Premium quality structural steel materials with global supply capability from India.
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Trusted structural steel supplier specialized in Russian structural carbon steel ST3 and industrial steel grades
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Wide product range in plates, sheets, bars, pipes, tubes, and structural sections
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GOST standard quality manufactured as per Russian and international standards
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Competitive pricing for cost-effective steel solutions for construction industries
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Custom manufacturing support for custom sizes and structural components
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Reliable supply chain with fast delivery for industrial and infrastructure projects
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Strong technical engineering expertise
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Fast global delivery from India
Order ST3 Steel from Russian Metals
Russian Metals is your trusted supplier of ST3 Steel (Ст3 Steel), low carbon structural steel ST3, and weldable carbon steel products. We provide high-quality structural steel for construction, engineering, and fabrication applications with consistent strength and reliability.
* ST3 (Ст3) - Low carbon structural steel: chemical composition, mechanical properties, physical properties, equivalent grades (S235JR, ASTM A36, St37-2), and applications for construction structures, building frameworks, bridges, industrial fabrication, and general engineering.
Contact Russian Metals today to order premium ST3 plates, sheets, bars, rods, pipes, tubes, structural beams, coils, and industrial steel products for your project requirements.