GX7CrNiMo12-1 (EN 1.4008) Martensitic Stainless Steel Casting Material
Martensitic Stainless Steel
Introduction
GX7CrNiMo12-1 is a martensitic stainless steel grade covered by EN 10283, ISO 11972. Typical family applications include internal pump and valve parts.
| 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 Materials
N/A
Similar Materials
N/A
Reference Standards
Related Casting Products
Physical Properties
| Property | Value / Unit | Note | Source |
|---|---|---|---|
| Density | 7.7 kg/dm³ | Test at 20 °C | EN 10283 |
| Specific Heat | 460 J/(kg·K) | Test at 20 °C | EN 10283 |
| Thermal Conductivity | 25 W/(m·K) | Test at 50 °C | EN 10283 |
| Thermal Conductivity | 26 W/(m·K) | Test at 100 °C | EN 10283 |
| Thermal Expansion | 10.5 ×10⁻⁶/K | Temperature range: 20–100 °C | EN 10283 |
| Thermal Expansion | 11.3 ×10⁻⁶/K | Temperature range: 20–300 °C | EN 10283 |
| Thermal Expansion | 12 ×10⁻⁶/K | Temperature range: 20–500 °C | EN 10283 |
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
Core Mechanical Properties
EN 10283 — 2019 · Table 2 — Normative
| Property | +QT |
|---|---|
| Yield Strength (Rp0.2) | ≥ 440 MPa |
| Tensile Strength | ≥ 590 MPa |
| Elongation | ≥ 15 % |
| Impact Energy | ≥ 27 J[1] |
- 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.
ISO 11972 — 2023 · Table 2 — Normative
| Property | Heat treated |
|---|---|
| Yield Strength (Rp0.2) | ≥ 440 MPa |
| Tensile Strength | ≥ 590 MPa |
| Elongation | ≥ 15 % |
| Impact Energy | ≥ 27 J[2] |
- 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.
Notes
EN 10283 · Edition 2019
[1] Impact Energy: KV2 as specified in
ISO 11972 · Edition 2023
[2] 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. Other cast components used in this material family include internal pump and valve parts. These castings are used in water-service pumping systems, industrial process equipment and power-generation facilities.
Need GX7CrNiMo12-1 Castings?
Contact us for casting and machining inquiries.
Email Us for a QuoteLast Updated: November 6, 2026