Steel G20Mo5
EN 1.5419
A carbon-molybdenum cast steel widely used for pressure-retaining components (valves, pump casings, flanges) operating up to about 450°C, broadly comparable to the ASTM A216/A352 carbon-moly casting family.
Reference datasheet — G20Mo5 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 +N+T condition
G20Mo5 tempers and conditions
G20Mo5 is supplied in 4 conditions, soft to hard. +N+T is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Full-anneal condition used to soften castings for heavy machining or repair welding before final heat treatment. | 250 | 460 | 28 | 135 HB | 8.7 % IACS |
Normalized | Normalized only; used for thinner non-pressure or lightly loaded castings where no tempering is specified. | 270 | 490 | 24 | 145 HB | 8.6 % IACS |
+N+TDefault Normalized and tempered | Default pressure-casting condition: normalize ~900–940 °C, temper 620–680 °C for stable 245 MPa min yield and 27 J toughness. | 285 | 510 | 25 | 150 HB | — |
Quenched and tempered | Choose for heavy-section castings needing uniform properties, higher yield and better low-temperature toughness. | 330 | 550 | 23 | 170 HB | — |
Supply forms, finishes and certifications
Ways G20Mo5 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
LC1 | A352 Grade LC1 | Certification |
What is G20Mo5?
A carbon-molybdenum cast steel widely used for pressure-retaining components (valves, pump casings, flanges) operating up to about 450°C, broadly comparable to the ASTM A216/A352 carbon-moly casting family. G20Mo5 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). G20Mo5 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 89% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi).
What is G20Mo5 used for?
- valve bodies
- pump casings
- high-temperature piping fittings
Advantages
- High service temperature — 450°C (842 °F), better than 86% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Low strength — 285 MPa (41.3 ksi), worse than 89% of steel grades
- Limited formability — 15/100, worse than 87% of steel grades
G20Mo5 properties
Typical room-temperature values for G20Mo5-+N+T; bars are the position among steel grades.
Physical3
G20Mo5 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
G20Mo5 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 89% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G20Mo5 is rated for continuous service to 450°C (842 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), better than 57% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical2
G20Mo5 has an electrical resistivity of 2×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of G20Mo5 takes about 27 MJ of energy and emits 2.2 kg of CO₂ — less than 59% of steel grades. Typical recycled content is 75%.
Manufacturability8
G20Mo5's machinability is good (58/100, better than 75% of steel grades); weldability very good (70/100); formability poor (15/100).
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. G20Mo5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G20Mo5
Is G20Mo5 easy to machine?
Machines like normalized 4130-class steel — use carbide at 120–180 m/min, expect variable skin hardness and sand inclusions on unblasted casting surfaces.
Can G20Mo5 be welded?
P-No.3 material: SMAW/GTAW/SAW with 1.25Cr–0.5Mo or C-Mo filler (E7018-A1), preheat 150–200 °C and PWHT 620–680 °C for pressure-boundary and repair welds.
Can G20Mo5 be formed, bent or molded?
Supplied as sand or investment castings; keep uniform wall thickness with generous risers and 2–3 % shrinkage allowance, then normalize/temper the whole casting.
G20Mo5 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 |
|---|---|---|
| CEN 10213; ASTM A352 LC1 allows ≤0.25 | 0.15 – 0.23 | 0.19 |
| Si | ≤ 0.6 | 0.35 |
| MnA352 LC1: 0.50–0.80 | 0.5 – 1 | 0.75 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Mo | 0.4 – 0.6 | 0.5 |
| Crresidual | ≤ 0.3 | 0.1 |
| Niresidual | ≤ 0.4 | 0.15 |
| Curesidual | ≤ 0.3 | 0.1 |
| Vresidual | ≤ 0.03 | 0.01 |
| Fe | balance |
What surface finishes work on G20Mo5?
No inherent corrosion resistance — shot blast then epoxy/zinc-rich paint, aluminium metallizing or phosphating; anodizing is not applicable.
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 G20Mo5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.5419
- Similar grades
- A352 Grade LC1
How much does G20Mo5 cost?
G20Mo5 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
G20Mo5 — frequently asked
What is G20Mo5 used for?
G20Mo5 is typically used for valve bodies, pump casings and high-temperature piping fittings. In short: carbon-moly pressure casting; service to 450 °C; weldable P-No.3 casting.
What is the yield strength of G20Mo5?
G20Mo5 has a typical yield strength of 285 MPa (41.3 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 89% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is G20Mo5 easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like normalized 4130-class steel — use carbide at 120–180 m/min, expect variable skin hardness and sand inclusions on unblasted casting surfaces.
Can G20Mo5 be welded?
Yes — weldability is rated very good (70/100). P-No.3 material: SMAW/GTAW/SAW with 1.25Cr–0.5Mo or C-Mo filler (E7018-A1), preheat 150–200 °C and PWHT 620–680 °C for pressure-boundary and repair welds.
What surface finishes work on G20Mo5?
No inherent corrosion resistance — shot blast then epoxy/zinc-rich paint, aluminium metallizing or phosphating; anodizing is not applicable.
Can G20Mo5 be formed, bent or molded?
Supplied as sand or investment castings; keep uniform wall thickness with generous risers and 2–3 % shrinkage allowance, then normalize/temper the whole casting.
What is the maximum service temperature of G20Mo5?
G20Mo5 is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does G20Mo5 cost?
G20Mo5 is a standard-cost steel ($$), cheaper than about 71% 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
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- ASTM A352/A352M — Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts for Low-Temperature Service (Gr. LC1) — ASTM (2018)
- ASTM A217/A217M — Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts (Gr. WC1) — ASTM (2021)
- GB/T 16253 — (ZG20Mo) — SAC (2019)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — SFSA / ASM International (1995)
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.