Steel 14G2AF-N (Normalized)
Heat-treated state
EN 14G2AF
Choose for thick plate and pressure parts where uniform fine grain and guaranteed −60 °C toughness are required.
Values for the N condition
Other 14G2AF tempers and conditions
14G2AF is listed in 6 conditions; see the grade overview at 14G2AF.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Only for severe cold forming or intermediate machining; sacrifices most of the V(C,N) precipitation strengthening. | 330 | 500 | 28 | 145 HB | 8.8 % IACS |
NThis page Normalized | Choose for thick plate and pressure parts where uniform fine grain and guaranteed −60 °C toughness are required. | 420 | 570 | 24 | 165 HB | — |
HRDefault Hot rolled | Standard stocked condition for plate, coil and welded pipe body; meets the 400 MPa strength class straight off the mill. | 430 | 580 | 22 | 170 HB | — |
14G2AF-Yu | Specify when guaranteed grain refinement and improved sub-zero impact energy are needed in thick sections. | 440 | 590 | 23 | 175 HB | 8.5 % IACS |
Thermomechanically controlled processed | Pick for line pipe skelp where the best combination of X60 strength, low CE and −60 °C DWTT/CVN performance is needed. | 460 | 600 | 24 | 180 HB | — |
Quenched and tempered | Used when a higher strength class (σ0.2 ≥ 500 MPa) is specified for heavy structural sections; needs tighter welding control. | 540 | 680 | 18 | 18 HRC | — |
What is 14G2AF-N?
14G2AF-N is 14G2AF heat treated to N — choose for thick plate and pressure parts where uniform fine grain and guaranteed −60 °C toughness are required. 14G2AF-N has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 53% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi). 14G2AF-N has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F). HR is the default condition FabDigit quotes; N is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
- Readily welded — 80/100, better than 79% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
14G2AF-N properties
Typical room-temperature values for 14G2AF-N; 10 are specific to this condition. Other listed values are 14G2AF reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
14G2AF-N has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F).
Mechanical16
14G2AF-N has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 53% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
14G2AF-N is rated for continuous service to 400°C (752 °F). It conducts heat at 46 W/m·K (26.6 BTU/hr·ft·°F), better than 71% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
14G2AF-N conducts electricity at 8.5 % IACS, better than 63% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 14G2AF-N takes about 25 MJ of energy and emits 2.1 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability8
14G2AF-N's machinability is fair (52/100, better than 52% of steel grades); weldability very good (80/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 14G2AF-N
Is 14G2AF easy to machine?
Machines like a normalized 0.15 %C HSLA steel (~55 % of AISI 1212); use rigid setups, coated carbide and moderate feeds — the V(C,N) dispersion gives slightly higher tool wear than plain C-Mn steel.
Can 14G2AF be welded?
Readily weldable by SAW/GMAW/SMAW with low-hydrogen consumables; CE(IIW) ≈ 0.40–0.45, so preheat 100–150 °C above ~25 mm thickness and limit heat input to protect HAZ toughness.
Can 14G2AF be formed, bent or molded?
Cold forms well for UOE/JCOE pipe and press-brake work at bend radii ≥ 2–3 t; hot forming above 950 °C or PWHT above ~650 °C dissolves/coarsens vanadium precipitates and lowers yield strength.
What surface finishes work on 14G2AF?
No anodizing; protect with shot-blast + 3LPE/FBE pipeline coating, epoxy paint, hot-dip galvanizing or cathodic protection — bare surface rusts as fast as mild steel.
14G2AF 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 |
|---|---|---|
| C | 0.12 – 0.18 | 0.15 |
| Si | 0.3 – 0.6 | 0.45 |
| Mn | 1.2 – 1.6 | 1.4 |
| Vprecipitation strengthening as V(C,N) | 0.07 – 0.12 | 0.09 |
| Ndeliberate nitrogen addition | 0.02 – 0.03 | 0.02 |
| Nboptional in pipeline/TMCP versions | ≤ 0.05 | 0.03 |
| Al≥0.02 in the -Yu (Al-treated) variant | ≤ 0.05 | 0.03 |
| Crresidual | ≤ 0.3 | — |
| Niresidual | ≤ 0.3 | — |
| Curesidual | ≤ 0.3 | — |
| S | ≤ 0.04 | 0.01 |
| P | ≤ 0.03 | 0.02 |
| Fe | balance | — |
14G2AF-N — frequently asked
What is 14G2AF-N used for?
14G2AF-N is typically used for gas pipelines, cold-region pipe and welded pipe structures. In short: X60-class pipeline steel; micro-alloyed for arctic toughness; higher strength than 09G2S.
What is the yield strength of 14G2AF-N?
14G2AF-N has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 53% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 14G2AF-N easy to machine?
Reasonably — machinability is rated fair (52/100, better than 52% of steel grades). Machines like a normalized 0.15 %C HSLA steel (~55 % of AISI 1212); use rigid setups, coated carbide and moderate feeds — the V(C,N) dispersion gives slightly higher tool wear than plain C-Mn steel.
Can 14G2AF-N be welded?
Yes — weldability is rated very good (80/100). Readily weldable by SAW/GMAW/SMAW with low-hydrogen consumables; CE(IIW) ≈ 0.40–0.45, so preheat 100–150 °C above ~25 mm thickness and limit heat input to protect HAZ toughness.
What surface finishes work on 14G2AF-N?
No anodizing; protect with shot-blast + 3LPE/FBE pipeline coating, epoxy paint, hot-dip galvanizing or cathodic protection — bare surface rusts as fast as mild steel.
Can 14G2AF-N be formed, bent or molded?
Cold forms well for UOE/JCOE pipe and press-brake work at bend radii ≥ 2–3 t; hot forming above 950 °C or PWHT above ~650 °C dissolves/coarsens vanadium precipitates and lowers yield strength.
What is the maximum service temperature of 14G2AF-N?
14G2AF-N 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 14G2AF-HR and 14G2AF-QT?
HR is the default condition — standard stocked condition for plate, coil and welded pipe body; meets the 400 MPa strength class straight off the mill. QT: used when a higher strength class (σ0.2 ≥ 500 MPa) is specified for heavy structural sections; needs tighter welding control. Yield strength is 430 MPa in HR versus 540 MPa in QT.
Sources
- GOST 19281-89 — Rolled steel with increased strength (14Г2АФ) — Gosstandart (1989)
- GOST 19282-73 — Low-alloy thick plate and wide strip — Gosstandart (1973)
- API 5L Specification for Line Pipe, 46th ed. — API (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.