G18NiMoCr3-6 (EN 1.6759) Low-Alloy Steel Casting Material
Low-Alloy Steel
Introduction
G18NiMoCr3-6 is a low-alloy steel casting grade covered by EN 10340. Typical applications include cast components in plant and mechanical engineering, automotive equipment and crane construction.
| 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 Materials
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 | Informative: quenching | 900–980 °C | liquid |
| 2 | Informative: tempering | 580–620 °C | — |
EN 10340–2007 · +QT2
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Informative: quenching | 900–980 °C | liquid |
| 2 | Informative: tempering | 590–630 °C | — |
Mechanical Properties
Core Mechanical Properties
Conditions are not identical. Compare each stated condition and applicability separately.
EN 10340 — 2007 · Table 2 — Normative
| Property | +QT1 | +QT2 |
|---|---|---|
| Yield Strength (Rp0.2) | ≥ 700 MPa[1] | ≥ 630 MPa[1] |
| Tensile Strength | 830–980 MPa[1] | 780–930 MPa[1] |
| Elongation | ≥ 12 %[1] | ≥ 12 %[1] |
- 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.
- +QT1: wall thickness ≤ 80 mm
- +QT2: wall thickness ≤ 150 mm
Additional Mechanical Properties
Low-Temperature Properties
Conditions are not identical. Compare each stated condition and applicability separately.
EN 10340 — 2007 · Table 2 — Normative
- 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.
- +QT1: wall thickness ≤ 80 mm
- +QT2: wall thickness ≤ 150 mm
Notes
EN 10340 · Edition 2007
[1] Yield Strength (Rp0.2)/Tensile Strength/Elongation: Room temperature
[2] Impact Energy: 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
Low-alloy steel EN 10340 G18NiMoCr3-6 is used for cast components in plant and mechanical engineering, automotive equipment and crane construction. Other documented sectors include offshore and mining equipment. Other cast components used in this material family include gear-related castings, couplings, housings, connecting parts and structural supports.
Applications include industrial machinery, mining, agricultural and railway equipment, construction machinery and power-transmission assemblies. The specified material condition and component duty remain important; no unverified wear-life or low-temperature rating is implied.
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