Steel 09G2S
EN 09G2S
09G2S is a manganese-silicon low-alloy structural steel from the GOST family, closely equivalent to Q345, strengthened by Mn and Si rather than by microalloy precipitates.
Reference datasheet — 09G2S is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the HR condition
09G2S tempers and conditions
09G2S is supplied in 6 conditions, soft to hard. HR is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Softest condition, used before heavy cold forming or deep machining; lowest strength, best ductility. | 310 | 470 | 28 | 135 HB | 8 % IACS |
HRDefault Hot rolled | Default mill condition for plate, sections and coil; general welded structures at ambient to −40 °C. | 350 | 500 | 22 | 150 HB | — |
Normalized | Choose for thick plate, pressure vessels and −70 °C service where uniform fine grain and guaranteed low-temperature Charpy are required. | 360 | 510 | 25 | 152 HB | — |
Thermomechanically controlled processed | Pick for heavy plate and linepipe where high toughness plus low carbon equivalent (better field weldability) is needed. | 400 | 540 | 24 | 165 HB | — |
Quenched and tempered | Used for high-strength thermally strengthened plate/pipe (термоупрочнённый) when 440+ MPa yield is needed at the same weldable chemistry. | 470 | 600 | 19 | 12 HRC | — |
Cold drawn | Cold-drawn round/flat bar and cold-formed hollow sections: higher yield and better surface/tolerance, reduced ductility. | 490 | 590 | 12 | 12 HRC | 8 % IACS |
What is 09G2S?
09G2S is a manganese-silicon low-alloy structural steel from the GOST family, closely equivalent to Q345, strengthened by Mn and Si rather than by microalloy precipitates. It is supplied hot-rolled, normalized, TMCP, quenched-and-tempered, annealed and cold-drawn as plate, sections and welded or seamless pipe, and is chosen where 350 MPa yield, 500 MPa tensile and 22% elongation must combine with a carbon equivalent of about 0.40-0.46. Service is limited to roughly 400 °C and the bare surface has no corrosion resistance, so a coating system is mandatory. Availability is strongest in CIS markets; S355J2 or Q345B are the usual substitutes. 09G2S has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). 09G2S has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 74% of steel grades. Elongation at break is 22% and the elastic modulus is 206 GPa (29.9 Msi).
What is 09G2S used for?
- pipelines
- welded structures
- pressure vessels
Advantages
- Readily welded — 88/100, better than 87% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
09G2S properties
Typical room-temperature values for 09G2S-HR; bars are the position among steel grades.
Physical3
09G2S has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
09G2S has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 74% of steel grades. Elongation at break is 22% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
09G2S is rated for continuous service to 400°C (752 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
09G2S conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of 09G2S takes about 27 MJ of energy and emits 2.2 kg of CO₂ — less than 59% of steel grades. Typical recycled content is 30%.
Manufacturability8
09G2S's machinability is good (58/100, better than 75% of steel grades); weldability excellent (88/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. 09G2S is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 09G2S
Is 09G2S easy to machine?
Machines like a 0.10 %C HSLA steel — gummy chips at low speed; use sharp positive-rake carbide, moderate feed and coolant, ~65 % of AISI 1212 rating.
Can 09G2S be welded?
Excellent weldability (CEV ≈ 0.40–0.46); SMAW/MAG/SAW with low-hydrogen consumables (E50xx / ER70S-6), preheat 100–150 °C only above ~30 mm thickness or below 0 °C.
Can 09G2S be formed, bent or molded?
Cold bends to 2t–3t radius in the as-rolled condition; hot forming 1150–850 °C followed by normalizing restores toughness for cryogenic service.
09G2S chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CGOST 19281 09Г2С | ≤ 0.12 | 0.1 |
| Si | 0.5 – 0.8 | 0.65 |
| Mn | 1.3 – 1.7 | 1.5 |
| Crresidual | ≤ 0.3 | 0.1 |
| Niresidual | ≤ 0.3 | 0.1 |
| Curesidual | ≤ 0.3 | 0.1 |
| P | ≤ 0.04 | 0.02 |
| S0.035 max for higher quality categories | ≤ 0.04 | 0.02 |
| N | ≤ 0.01 | 0.01 |
| AsGOST limit | ≤ 0.08 | |
| Fe | balance |
What surface finishes work on 09G2S?
No anodizing; protect by shot blast + epoxy/alkyd paint, hot-dip galvanizing or zinc-rich primer — bare surfaces rust rapidly outdoors.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel 09G2S in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- Q345
How much does 09G2S cost?
09G2S is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
09G2S — frequently asked
What is 09G2S used for?
09G2S is typically used for pipelines, welded structures and pressure vessels. In short: highly weldable structural HSLA; Q345/S355-class strength; low-cost CIS plate grade.
What is the yield strength of 09G2S?
09G2S has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 74% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 09G2S easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like a 0.10 %C HSLA steel — gummy chips at low speed; use sharp positive-rake carbide, moderate feed and coolant, ~65 % of AISI 1212 rating.
Can 09G2S be welded?
Yes — weldability is rated excellent (88/100). Excellent weldability (CEV ≈ 0.40–0.46); SMAW/MAG/SAW with low-hydrogen consumables (E50xx / ER70S-6), preheat 100–150 °C only above ~30 mm thickness or below 0 °C.
What surface finishes work on 09G2S?
No anodizing; protect by shot blast + epoxy/alkyd paint, hot-dip galvanizing or zinc-rich primer — bare surfaces rust rapidly outdoors.
Can 09G2S be formed, bent or molded?
Cold bends to 2t–3t radius in the as-rolled condition; hot forming 1150–850 °C followed by normalizing restores toughness for cryogenic service.
What is the maximum service temperature of 09G2S?
09G2S is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 09G2S-HR and 09G2S-CD?
HR is the default condition — default mill condition for plate, sections and coil; general welded structures at ambient to −40 °C. CD: cold-drawn round/flat bar and cold-formed hollow sections: higher yield and better surface/tolerance, reduced ductility. Yield strength is 350 MPa in HR versus 490 MPa in CD.
How much does 09G2S cost?
09G2S is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- GOST 19281 — Rolled steel of high strength. General specifications — Gosstandart (2014)
- GOST 5520 — Rolled plate for boilers and pressure vessels — Gosstandart (2017)
- GB/T 1591 — High strength low alloy structural steels (Q345/Q355) — SAC (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Marochnik stali i splavov — 09Г2С grade data — Marochnik (2020)
- Mysteel / SMM plate and section price indices (2026)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.