Introduction
G18NiMoCr3-6 (EN 1.6759) is a low-alloy steel casting grade specified in EN 10340. The standard covers steel castings for structural uses and defines the applicable delivery conditions and engineering requirements. Casting process options include Investment Casting, Shell Molding Casting and Sand Casting, subject to the applicable specification and component requirements.
| Field | Value |
|---|---|
| Designation | G18NiMoCr3-6 (EN 1.6759) |
| Material Type | Alloy Steel |
| Sub Type | Low-Alloy Steel |
| Product Form | casting |
Manufacturing Process
Investment Casting
Shell Molding Casting
Sand Casting
Equivalent Grades
N/A
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| EN 10340 | Steel castings for structural uses | 2007 | G18NiMoCr3-6 | — |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | EN 10340Edition 2007 · wt.%Cast analysis |
|---|---|
| C | 0.17–0.22 |
| Si | ≤ 0.60 |
| Mn | 0.80–1.20 |
| P | ≤ 0.020 |
| S | ≤ 0.015 |
| Cr | 0.40–0.90 |
| Ni | 0.60–1.00 |
| Mo | 0.40–0.70 |
| Cu | ≤ 0.30 |
| V | ≤ 0.05 |
Heat Treatment
EN 10340–2007 · +QT1
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | : quenching | 900–980 °C | liquid |
| 2 | : tempering | 580–620 °C | — |
EN 10340–2007 · +QT2
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | : quenching | 900–980 °C | liquid |
| 2 | : tempering | 590–630 °C | — |
Mechanical Properties
Conditions are not identical. Compare each stated condition and applicability separately.
| Property | EN 10340Edition 2007+QT1[1] | EN 10340Edition 2007+QT2[2] |
|---|---|---|
| Yield Strength (Rp0.2) | ≥ 700 MPa[3] | ≥ 630 MPa[4] |
| Tensile Strength | 830–980 MPa[3] | 780–930 MPa[4] |
| Elongation | ≥ 12 %[3] | ≥ 12 %[4] |
| Impact Energy | ≥ 27 J[5] | ≥ 27 J[6] |
Notes
EN 10340 · Edition 2007
[1] All properties in this column; +QT1: wall thickness ≤ 80 mm; Test block of relevant thickness; maximum thickness 150 mm; Yield and tensile strength also apply to the casting up to the maximum relevant wall thickness.
[2] All properties in this column; +QT2: wall thickness ≤ 150 mm; Test block of relevant thickness; maximum thickness 150 mm; Yield and tensile strength also apply to the casting up to the maximum relevant wall thickness.
[3] Yield Strength (Rp0.2)/Tensile Strength/Elongation; +QT1: Room temperature
[4] Yield Strength (Rp0.2)/Tensile Strength/Elongation; +QT2: Room temperature
[5] Impact Energy; +QT1: Test at -40 °C
[6] Impact Energy; +QT2: Test at -40 °C
Welding Conditions
EN 10340–2007
| Requirement | Value |
|---|---|
| Preheat | 20–200 °C[1] |
| Interpass Temperature | ≤ 350 °C |
| Post-weld Heat Treatment | Post-weld temperature 20–50 °C below the base-material tempering temperature |
Notes
EN 10340 · Edition 2007
[1] Preheat: Preheat depends on casting geometry, thickness and climatic conditions.
Applications
Typical applications for this structural steel casting family include components for buildings, bridges and other civil engineering works.
Last Updated: October 13, 2026