St65G
Characteristics for grade 65G ( 65Г )
ST65G Steel – High-Strength Carbon Steel for Industrial Applications
At Russian Metals, we supply ST65G steel — a high-strength carbon steel known for its excellent toughness, elasticity, and wear resistance. Designed for chemical, aerospace, mechanical, and heavy-duty engineering industries, ST65G steel is widely used in manufacturing springs, washers, clamping rings, gears, and other load-bearing components.
INTRODUCTION OF ST65G
At Russian Metals, we supply ST65G steel — a high-strength carbon steel renowned for its exceptional toughness, high elasticity, and superior wear resistance. Engineered for performance in demanding environments, ST65G delivers the mechanical strength required for dynamic loads, vibration, and continuous stress. Because of its outstanding fatigue resistance and stable microstructure, ST65G is widely used in the chemical, aerospace, mechanical, and heavy-duty engineering industries.
| Grade : | 65G ( 65Г ) |
| Substitute : | 70, У8А, 70Г, 60С2А, 9ХС, 50ХФА, 60С2, 55С2 |
| Classification : | Spring structural steel |
Key Features & Properties of ST65G Steel
- High strength & durability — Ideal for heavy mechanical and aerospace applications.
- Excellent elasticity — Perfect for springs, washers, and shock-absorbing components.
- Wear & fatigue resistance — Performs under extreme load and vibration.
- Good forgeability — Easily shaped at high temperatures for precision parts.
- Heat treatment compatibility — Quenching and tempering improve performance.
Chemical Composition (Typical Range)
| Element | Typical Range |
|---|---|
| Carbon (C) | 0.62 – 0.70% |
| Silicon (Si) | 0.17 – 0.37% |
| Manganese (Mn) | 0.90 – 1.20% |
| Phosphorus (P) | ≤ 0.035% |
| Sulfur (S) | ≤ 0.035% |
| Chromium (Cr) | ≤ 0.25% |
| Copper (Cu) | ≤ 0.20% |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Yield Strength | ≈ 785 MPa |
| Tensile Strength | ≈ 980 MPa |
| Elongation | 8% (minimum) |
| Reduction of Area | 30% |
| Brinell Hardness | HB 241 – 285 |
Applications of ST65G Steel
- Aerospace & mechanical engineering: Gears, shafts, thrust washers, and clutch plates.
- Spring manufacturing: Flat and round springs, clamping rings, and tension components.
- Heavy-duty industries: Shock-absorbing elements and high-wear machine parts.
- Automotive & industrial equipment: Locking rings, brake bands, and collets.
Chemical composition in % for grade 65G ( 65Г )
| C | Si | Mn | Ni | S | P | Cr | Cu |
|---|---|---|---|---|---|---|---|
| 0.62 - 0.7 | 0.17 - 0.37 | 0.9 - 1.2 | max 0.25 | max 0.035 | max 0.035 | max 0.25 | max 0.2 |
Temperature of critical points for grade 65G ( 65Г ).
| Ac1 = 721 , Ac3(Acm) = 745 , Ar3(Arcm) = 720 , Ar1 = 670 , Mn = 270 |
Mechanical properties under Т=20oС for grade 20 ( 20 )
| Assortment | Dimension | Direct. | σB | σT | δ5 | ψ | KCU | Heat treatment |
|---|---|---|---|---|---|---|---|---|
| - | (mm) | - | MPa | MPa | % | % | kJ/m² | - |
| Rolled stock, GOST 14959-79 | 980 | 785 | 8 | 30 | Guenching and drawing | |||
| Sheet trick, GOST 1577-93 | 740 | 12 | ||||||
| Band cold-worked , GOST 2283-79 | 740-1180 | |||||||
| Band annealed , GOST 2283-79 | 640-740 | 10-15 |
| Brinell hardness for 65G ( 65Г ) (without heat treatment) , GOST 14959 | HB 10 -1 = 285 MPa
| Brinell hardness for 65G ( 65Г ) (heat treatment) , Rolled stock GOST 14959-79 | HB 10 -1 = 241 MPa
| Brinell hardness for 65G ( 65Г ) (annealing) , Sheet trick GOST 1577-93 | HB 10 -1 = 229 MPa
Technological properties for grade 65G ( 65Г )
| Weldability : | is not used. |
| Flakes : | weakly predisposed |
| Temper brittleness: | predisposed |
Physical properties for grade 65G ( 65Г )
| T | E 10-5 | α 10⁶ | λ | ρ | C | R 10⁹ |
|---|---|---|---|---|---|---|
| Grade | MPa | 1/Grade | Watt/(m·Grade) | kg/m3 | J/(kg·Grade) | Ohm·m |
| 20 | 2.15 | 37 | 7850 | |||
| 100 | 2.13 | 11.8 | 36 | 7830 | 490 | |
| 200 | 2.07 | 12.6 | 35 | 7800 | 510 | |
| 300 | 2 | 13.2 | 34 | 525 | ||
| 400 | 1.8 | 13.6 | 32 | 7730 | 560 | |
| 500 | 1.7 | 14.1 | 31 | 575 | ||
| 600 | 1.54 | 14.6 | 30 | 590 | ||
| 700 | 1.36 | 14.5 | 29 | 625 | ||
| 800 | 1.28 | 11.8 | 28 | 705 | ||
| T | E 10 -5 | α 10⁶ | λ | ρ | C | R 10⁹ |
Types of delivery of grade 65G ( 65Г )
- B05 - Welding and cutting of metals., Soldering, riveting
- В22 - Graded and shaped rolling
- B23 - Sheets and Strips
- B32 - Graded and shaped rolling
- B33 - Sheets and Strips
- B34 - Ribbons
- В71 - Low-carbon steel wire
- В72 - Medium-high and high-carbon steel wire
Specification
Mechanical properties :
σB - Tensile strength [MPa]
σT - Yield stress [MPa]
δ5 - Specific elongation at fracture [%]
ψ - Reduction of area [%]
KCU - Impact strength [kJ/m²]
HB - Brinell hardness [MPa]
ST65G Steel Available in All Dimensions
At Russian Metals, we provide ST65G steel in all standard and custom dimensions to suit your project requirements — from rolled bars and sheets to precision-cut profiles and coils. Our experts assist in selecting the right size, treatment, and finish for your application.
Why Choose Russian Metals for ST65G Steel?
- Trusted supplier in India with global sourcing capabilities.
- Custom cutting & machining services for ready-to-use components.
- Fast delivery & reliable supply chain for bulk and project-based requirements.
- Expert technical support to help choose the right grade and treatment.
Order ST65G Steel Today
Looking for ST65G steel available in all dimensions for your next industrial project? Contact Russian Metals for competitive pricing, fast shipping, and expert guidance.
Physical properties :
T - Test temperature [Grade]
E - Young modulus [MPa]
α - Coefficient of linear expansion (20° - T) [1/Grade]
λ - Thermal (heat) condition coefficient [Watt/(m·Grade)]
ρ - Density [kg/m³]
C - Specific heat (range 20° - T) [J/(kg·Grade)]
R - Electrical resistance [Ohm·m]
Weldability :
without limitations - welding is done without heating and subsequent heat treeting
limited weldability - welding is possible under heating up to 100-120 grade and subsequent heat treeting
hard weldability - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing
65G ( 65Г ) - Normal quality structural carbon steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys