Steel G20NiMoCr4
EN 1.6750
G20NiMoCr4 (1.6750) is a low-carbon, low-alloy nickel-molybdenum-chromium cast steel available as-cast (F) and in +A, +N, +NT, +QT, +QT2 and +QT+SR conditions.
Reference datasheet — G20NiMoCr4 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 +QT condition
G20NiMoCr4 tempers and conditions
G20NiMoCr4 is supplied in 7 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose for rough machining of large castings before the final quench-and-temper cycle. | 330 | 560 | 24 | 165 HB | 7.9 % IACS |
Normalized | Grain-refining treatment used as an intermediate step or for lightly loaded castings. | 400 | 630 | 18 | 190 HB | 7.8 % IACS |
As fabricated | Raw foundry state before heat treatment; not a delivery condition for pressure parts — coarse, segregated structure with poor toughness. | 420 | 700 | 10 | 17 HRC | 7.8 % IACS |
Normalized and tempered | Economical delivery condition for thick castings where full quench penetration is impractical; slightly lower strength than +QT. | 420 | 620 | 20 | 185 HB | 7.8 % IACS |
Quenched, tempered and stress-relieved after weld repair | Used after foundry weld repair or heavy machining of pressure castings to restore dimensional stability and HAZ toughness. | 445 | 640 | 19 | 195 HB | 7.8 % IACS |
+QTDefault Quenched and tempered | Standard supply condition: best combination of ≈400–500 MPa yield with high sub-zero notch toughness in heavy sections. | 460 | 660 | 18 | 200 HB | — |
Quenched and tempered, high-strength class | Pick where ≥550 MPa yield is needed in thinner sections and some toughness margin can be traded away. | 600 | 800 | 14 | 24 HRC | — |
What is G20NiMoCr4?
G20NiMoCr4 (1.6750) is a low-carbon, low-alloy nickel-molybdenum-chromium cast steel available as-cast (F) and in +A, +N, +NT, +QT, +QT2 and +QT+SR conditions. It is used for heavy-section pressure equipment castings that need good through-thickness toughness: the default condition gives 460 MPa yield, 660 MPa tensile, 18 % elongation and 200 HB, with service to 400 °C. Strength is lower than the Ni-Cr-Mo Q&T grades, but machinability (55) and weldability (55) are the best in this family, with a 580–620 °C PWHT. For higher strength at the cost of weldability, consider G25NiCrMo6. G20NiMoCr4 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). G20NiMoCr4 has a yield strength of 460 MPa (66.7 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 55% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi).
What is G20NiMoCr4 used for?
- reactor and pressure vessel castings
- power plant components
- heavy pressure-retaining parts
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
Limitations
- Limited formability — 20/100, worse than 80% of steel grades
G20NiMoCr4 properties
Typical room-temperature values for G20NiMoCr4-+QT; bars are the position among steel grades.
Physical3
G20NiMoCr4 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
G20NiMoCr4 has a yield strength of 460 MPa (66.7 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 55% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G20NiMoCr4 is rated for continuous service to 400°C (752 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
G20NiMoCr4 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of G20NiMoCr4 takes about 24 MJ of energy and emits 1.9 kg of CO₂ — less than 97% of steel grades. Typical recycled content is 75%.
Manufacturability8
G20NiMoCr4's machinability is good (55/100, better than 62% of steel grades); weldability good (55/100); formability poor (20/100).
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. G20NiMoCr4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G20NiMoCr4
Is G20NiMoCr4 easy to machine?
Machine in the annealed or as-normalized state where possible; in +QT use rigid setups, coated carbide, moderate speeds and generous coolant to handle the tough bainitic matrix and cast skin.
Can G20NiMoCr4 be welded?
Weldable with matching low-alloy Ni-Mo consumables, 150–250 °C preheat, low-hydrogen practice and a 580–620 °C PWHT; avoid welding after final temper without requalification.
Can G20NiMoCr4 be formed, bent or molded?
Supplied as sand or investment castings — feed heavy sections with risers and chills, allow ~2 % shrinkage and always follow with a homogenizing/austenitizing cycle.
G20NiMoCr4 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 |
|---|---|---|
| Clow C for weldability | 0.15 – 0.23 | 0.2 |
| Si | ≤ 0.6 | 0.35 |
| Mn | 0.5 – 1 | 0.8 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Cr | 0.3 – 0.6 | 0.45 |
| Mo | 0.35 – 0.6 | 0.5 |
| Ni | 0.8 – 1.2 | 1 |
| Vresidual | ≤ 0.05 | |
| Curesidual | ≤ 0.3 | |
| Fe | balance |
What surface finishes work on G20NiMoCr4?
Shot-blast and prime; use paint, zinc-rich coatings, hard chrome or nitriding for wear faces — no anodizing on ferrous alloys.
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 G20NiMoCr4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.6750
How much does G20NiMoCr4 cost?
G20NiMoCr4 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.
G20NiMoCr4 — frequently asked
What is G20NiMoCr4 used for?
G20NiMoCr4 is typically used for reactor and pressure vessel castings, power plant components and heavy pressure-retaining parts. In short: best-welding cast alloy steel; pressure-vessel toughness grade; service to 400 °C.
What is the yield strength of G20NiMoCr4?
G20NiMoCr4 has a typical yield strength of 460 MPa (66.7 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 55% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is G20NiMoCr4 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machine in the annealed or as-normalized state where possible; in +QT use rigid setups, coated carbide, moderate speeds and generous coolant to handle the tough bainitic matrix and cast skin.
Can G20NiMoCr4 be welded?
Yes — weldability is rated good (55/100). Weldable with matching low-alloy Ni-Mo consumables, 150–250 °C preheat, low-hydrogen practice and a 580–620 °C PWHT; avoid welding after final temper without requalification.
What surface finishes work on G20NiMoCr4?
Shot-blast and prime; use paint, zinc-rich coatings, hard chrome or nitriding for wear faces — no anodizing on ferrous alloys.
Can G20NiMoCr4 be formed, bent or molded?
Supplied as sand or investment castings — feed heavy sections with risers and chills, allow ~2 % shrinkage and always follow with a homogenizing/austenitizing cycle.
What is the maximum service temperature of G20NiMoCr4?
G20NiMoCr4 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 G20NiMoCr4 +QT and G20NiMoCr4-F?
+QT is the default condition — standard supply condition: best combination of ≈400–500 MPa yield with high sub-zero notch toughness in heavy sections. F: raw foundry state before heat treatment; not a delivery condition for pressure parts — coarse, segregated structure with poor toughness. Yield strength is 460 MPa in +QT versus 420 MPa in F.
How much does G20NiMoCr4 cost?
G20NiMoCr4 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)
- EN 10293 — Steel castings for general engineering uses — CEN (2015)
- DIN 17205 — Quenched and tempered steel castings for general purposes — DIN (1992)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (cast low-alloy steels) — ASM International (1990)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
- SEW 310 — Physical properties of steels — Verlag Stahleisen (1992)
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.