GX7CrNiMo12-1 (EN 1.4008) Martensitic Stainless Steel Casting Material
Martensitic Stainless Steel
Introduction
GX7CrNiMo12-1 is a martensitic stainless steel grade specified in EN 10283 for corrosion-resistant cast components. Casting process options include Investment Casting, Shell Molding Casting and Sand Casting, subject to the applicable specification and component requirements.
| Field | Value |
|---|---|
| Designation | GX7CrNiMo12-1 (EN 1.4008) |
| Material Type | Stainless Steel |
| Sub Type | Martensitic Stainless Steel |
| Product Form | casting |
Manufacturing Process
Investment Casting
Shell Molding Casting
Sand Casting
Equivalent Grades
N/A
Similar Materials
N/A
Reference Standards
Related Casting Products
Physical Properties
EN 10283–2019
| Property | Value | Note |
|---|---|---|
| Density | 7.7 kg/dm³ | Test at 20 °C |
| Specific Heat | 460 J/(kg·K) | Test at 20 °C |
| Thermal Conductivity | 25 W/(m·K) | Test at 50 °C |
| Thermal Conductivity | 26 W/(m·K) | Test at 100 °C |
| Thermal Expansion | 10.5 ×10⁻⁶/K | Temperature range: 20–100 °C |
| Thermal Expansion | 11.3 ×10⁻⁶/K | Temperature range: 20–300 °C |
| Thermal Expansion | 12 ×10⁻⁶/K | Temperature range: 20–500 °C |
Chemical Composition
| Element | EN 10283Edition 2019 · wt.%Cast analysis | ISO 11972Edition 2023 · wt.% |
|---|---|---|
| C | ≤ 0.10 | ≤ 0.10 |
| Si | ≤ 1.00 | ≤ 1.0 |
| Mn | ≤ 1.00 | ≤ 1.0 |
| P | ≤ 0.035 | ≤ 0.035 |
| S | ≤ 0.025 | ≤ 0.025 |
| Cr | 12.00–13.50 | 12.0–13.5 |
| Ni | 1.00–2.00 | 1.0–2.0 |
| Mo | 0.20–0.50 | 0.20–0.50 |
| Cu | ≤ 0.30[1] | — / Not specified |
| V | ≤ 0.08[1] | — / Not specified |
Notes
EN 10283 · Edition 2019
[1] Cu/V: Applies unless otherwise agreed; unspecified elements shall not be intentionally added without purchaser agreement except for finishing the heat.
Heat Treatment
EN 10283–2019 · +QT
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | quenching | 1000–1050 °C | air or liquid |
| 2 | tempering | 620–720 °C | — |
ISO 11972–2023 · Heat treated
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | austenitizing | 1000–1050 °C | air cool |
| 2 | tempering | 620–720 °C | air or furnace cool |
Mechanical Properties
| Property | EN 10283Edition 2019[1] | ISO 11972Edition 2023[2] |
|---|---|---|
| Yield Strength (Rp0.2) | ≥ 440 MPa | ≥ 440 MPa |
| Tensile Strength | ≥ 590 MPa | ≥ 590 MPa |
| Elongation | ≥ 15 % | ≥ 15 % |
| Impact Energy | ≥ 27 J[3] | ≥ 27 J[4] |
Notes
EN 10283 · Edition 2019
[1] All properties in this column: wall thickness ≤ 300 mm; Test block; maximum thickness 150 mm; Room temperature; Yield and tensile strength also apply to the casting up to the maximum specified wall thickness.
[3] Impact Energy: KV2 as specified in
ISO 11972 · Edition 2023
[2] All properties in this column: wall thickness ≤ 300 mm; Room temperature; Test blocks used to verify mechanical properties shall not exceed 150 mm thickness. Properties for samples removed from castings shall be agreed between manufacturer and purchaser.
[4] Impact Energy: Verification of impact tests is required only when indicated by the customer.
Welding Conditions
EN 10283–2019
Notes
EN 10283 · Edition 2019
[1] Preheat: Preheat depends on casting geometry, thickness and climatic conditions.
[2] Post-weld Heat Treatment: minor welds
[3] Post-weld Heat Treatment: major welds
Applications
Typical casting applications include impellers, pump parts and valve parts exposed to water or steam.
Last Updated: October 16, 2026