30KHGSА ( 30ХГСА )
30KHGSA (30ХГСА) – High-Strength Structural Alloy Steel
Introduction to 30KHGSA Steel
30KHGSA is a high-strength low-alloy structural steel widely used for parts requiring high toughness, wear resistance, and fatigue strength. Known in Russian standards as 30ХГСА, this steel is popular across aerospace, automotive, and heavy machinery industries due to its excellent mechanical performance after heat treatment. At Russian Metals, we supply 30KHGSA steel sheets, bars, plates, and custom-forged products to manufacturers in India and export to global markets with fast delivery and quality assurance.
| Grade : | 30KHGSА ( 30ХГСА ) |
| Substitute: | 40ХФА, 35ХМ, 40ХН, 25ХГСА, 35ХГСА |
| Classification : | Alloy structurall steel |
Mechanical properties under Т=20°С f°r grade 30KHGSА ( 30ХГСА )
| Assortment | Dimension | Direct. | σB | σT | δ5 | ψ | KCU | Heat treatment |
|---|---|---|---|---|---|---|---|---|
| - | (mm) | - | MPa | MPa | % | % | kJ/m² | - |
| Pipe, GOST 8731-87 | 686 | 11 | ||||||
| Pipe cooling strain, GOST 8733-74 | 491 | 18 | ||||||
| Bar, GOST 4543-71 | Ø 25 | 1080 | 830 | 10 | 45 | 490 | Guenching 880oC, oil, Drawing 540oC, water, | |
| Sheet trick, GOST 11269-76 | 490-740 | 20 | Normalizing | |||||
| Sheet trick, GOST 11269-76 | 1080 | 9 | 490 | Guenching and drawing | ||||
| Sheet thin, GOST 11268-76 | 490-740 | 20 | Normalizing | |||||
| Sheet thin, GOST 11268-76 | 1080 | 10 | Guenching and drawing |
| Brinell hardness for 30KHGSА ( 30ХГСА ) (annealing) , GOST 4543-71 | HB 10 -1 = 229 MPa |
| Brinell hardness for 30KHGSА ( 30ХГСА ) , Pipe GOST 8733-74 | HB 10 -1 = 229 MPa |
| Brinell hardness for 30KHGSА ( 30ХГСА ) , Bar GOST 10702-78 | HB 10 -1 = 217 MPa |
| Brinell hardness for 30KHGSА ( 30ХГСА ) (normalize) , Sheet trick GOST 11269-76 | HB 10 -1 = 156 - 217 MPa |
Technological properties for grade 30KHGSА ( 30ХГСА )
| Weldability : | limited weldability. |
| Flakes : | predisposed |
| Temper brittleness: | predisposed |
Physical properties for grade M3 ( М3 )
| 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 | 38 | 7850 | 210 | ||
| 100 | 2.11 | 11.7 | 38 | 7830 | 496 | |
| 200 | 2.03 | 12.312.3 | 37 | 7800 | 504 | |
| 300 | 1.96 | 12.9 | 37 | 7760 | 512 | |
| 400 | 1.84 | 13.4 | 36 | 7730 | 533 | |
| 500 | 1.73 | 13.7 | 34 | 7700 | 554 | |
| 600 | 1.64 | 14 | 33 | 7670 | 584 | |
| 700 | 1.43 | 14.3 | 31 | 622 | ||
| 800 | 12.9 | 12.9 | 30 | 693 | ||
| T | E 10- 5 | α 10⁶ | λ | ρ | C | R 10⁹ |
Chemical Composition & Standards
30KHGSA (GOST 4543-71) is a chromium–manganese–silicon alloy steel widely used in structural and engineering applications due to its strength and toughness.
Typical Chemical Composition (%)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.28 – 0.34 |
| Manganese (Mn) | 0.8 – 1.1 |
| Silicon (Si) | 0.9 – 1.2 |
| Chromium (Cr) | 0.8 – 1.1 |
| Nickel (Ni) | ≤ 0.30 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
Standards & Equivalents
- Complies with GOST 4543-71 standard
- Equivalent to several international alloy steel grades
Equivalent steels for grade M3 ( М3 )
Warning! Indicated both exact and nearest equivalents.
| Bulgaria | Poland | Czechia |
|---|---|---|
| BDS | PN | CSN |
| 30ChGSA | 30HGS 30HGSA | 14331 |
Mechanical Properties
- Tensile Strength (Rm): 980 – 1180 MPa
- Yield Strength (Re): ≥ 830 MPa
- Elongation (A5): 10 – 13%
- Impact Toughness (KCU): ≥ 49 J/cm²
- Hardness (HB): 295 – 360 (after heat treatment)
Types of delivery of grade 30KHGSА ( 30ХГСА )
- B03 - Metal forming treatment. Forgings
- В05 - Welding and cutting of metals., Soldering, riveting
- В22 - Graded and shaped rolling
- B23 - Sheets and Strips
- В32 - Graded and shaped rolling
- B33 - Sheets and Strips
- В62 - Steel pipes and connecting parts to them
- В71 - Low-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]
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
30KHGSA Steel Equivalent Grades
- 30ChGSA / 30KhGSA (30ХГСА) – Russian
- 30CrMnSiA – Chinese GB/T
- 30HGS, 30HGSA – Polish & Czech
- A24303 / A 24303 – International designations
Understanding 30KHGSA steel equivalents helps in selecting compatible materials for global supply chains.
Why Choose Russian Metals for 30KHGSA
- Reliable Global Supply: Fast shipping to India & worldwide.
- Certified Quality: Sourced from trusted Russian mills.
- Custom Processing: Cutting, forging, and finishing to meet your specifications.
- Expert Support: Technical guidance for selecting the right 30KHGSA steel equivalent.