G18Mo5 (EN 1.5422) Low-Alloy Steel Casting Material
Low-Alloy Steel
Introduction
G18Mo5 is a low-alloy steel casting grade covered by EN 10213. Typical family applications include valve bodies, pump casings and fittings.
| Field | Value |
|---|---|
| Designation | G18Mo5 (EN 1.5422) |
| 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 10213 | Steel castings for pressure purposes | 2007+A1:2016 | G18Mo5 | — |
Related Casting Products
Physical Properties
| Property | Value / Unit | Note | Source |
|---|---|---|---|
| Density | 7.85 kg/dm³ | Test at 20 °C | EN 10213 |
| Thermal Expansion | 12.4 ×10⁻⁶/K | Temperature range: 20–100 °C | EN 10213 |
| Thermal Expansion | 13.1 ×10⁻⁶/K | Temperature range: 20–300 °C | EN 10213 |
| Thermal Expansion | 13.8 ×10⁻⁶/K | Temperature range: 20–500 °C | EN 10213 |
| Thermal Conductivity | 43 W/(m·K) | Test at 50 °C | EN 10213 |
| Specific Heat | 460 J/(kg·K) | Test at 20 °C | EN 10213 |
| Magnetic Property | Magnetic | EN 10213 |
Chemical Composition
| Element | EN 10213Edition 2007+A1:2016 · wt.%Cast analysis |
|---|---|
| C | 0.15–0.20 |
| Si | ≤ 0.60 |
| Mn | 0.80–1.20 |
| P | ≤ 0.020 |
| S | ≤ 0.020 |
| Cr | ≤ 0.30 |
| Ni | ≤ 0.40 |
| Mo | 0.45–0.65 |
| Cu | ≤ 0.30 |
| V | ≤ 0.05 |
Heat Treatment
EN 10213–2007+A1:2016 · +QT
Notes
EN 10213 · Edition 2007+A1:2016
[1] +QT: Treatment temperatures are given for information; required delivery condition is specified separately.
Mechanical Properties
Core Mechanical Properties
Additional Mechanical Properties
Low-Temperature Properties
EN 10213 — 2007+A1:2016 · Table 4 — Normative
| Property | +QT |
|---|---|
| Impact Energy | ≥ 27 J[2] |
Notes
EN 10213 · Edition 2007+A1:2016
[1] Yield Strength (Rp0.2)/Tensile Strength/Elongation: wall thickness ≤ 100 mm; Properties verified on test blocks of thickness up to 150 mm; applicability to casting wall thickness as stated. Larger governing thickness requires agreement.; Room temperature
[2] Impact Energy: Test at -45 °C; Test block; maximum thickness 150 mm; Specified low-temperature impact requirement
Welding Conditions
EN 10213–2007+A1:2016
Notes
EN 10213 · Edition 2007+A1:2016
[1] Preheat: Production welding by the foundry; ferritic/martensitic guidance is informative.; Preheat temperature depends on casting geometry, thickness and climatic conditions.
[2] Interpass Temperature: Production welding by the foundry; ferritic/martensitic guidance is informative.
[3] Post-weld Heat Treatment: Production welding by the foundry; ferritic/martensitic guidance is informative.; In general, production welds are major when prepared cavity depth exceeds 40% of the wall thickness; minor weld corrosion conditions may require special agreement.
Applications
For low-alloy steel EN 10213 G18Mo5, typical cast components in this material family include valve bodies, pump casings and fittings. Applications include industrial process plants, heating circuits and power-generation equipment. Service medium, temperature, material condition and the finished equipment design determine the permitted duty; the grade name alone is not an operating rating.
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