Properties
General
| Property | Value |
|---|---|
Density | 7.7 g/cm³ Show Supplier Material materials with Density of 7.7 g/cm³ |
Mechanical
| Property | Value | Comment |
|---|---|---|
Elastic modulus | 215 GPa Show Supplier Material materials with Elastic modulus of 215 GPa | |
Elongation | 25 % Show Supplier Material materials with Elongation of 25 % | |
Hardness, Rockwell C | 47.0 - 50.0 [-] Show Supplier Material materials with Hardness, Rockwell C of 47.0 - 50.0 [-] | After quenching + tempering 100-300°C |
Tensile strength | 776 MPa Show Supplier Material materials with Tensile strength of 776 MPa |
Thermal
| Property | Value | Comment |
|---|---|---|
Coefficient of thermal expansion | 0.0000115 1/K Show Supplier Material materials with Coefficient of thermal expansion of 0.0000115 1/K | 20 to 300°C |
Thermal conductivity | 30 W/(m·K) Show Supplier Material materials with Thermal conductivity of 30 W/(m·K) |
Electrical
| Property | Value |
|---|---|
Electrical resistivity | 5.5e-07 Ω·m Show Supplier Material materials with Electrical resistivity of 5.5e-07 Ω·m |
Chemical properties
| Property | Value | Comment |
|---|---|---|
Carbon | 0.2 - 0.26 % Show Supplier Material materials with Carbon of 0.2 - 0.26 % | |
Chromium | 12.5 - 14.0 % Show Supplier Material materials with Chromium of 12.5 - 14.0 % | |
Manganese | 2.0 Show Supplier Material materials with Manganese of 2.0 | max. |
Molybdenum | 1.1 - 1.5 % Show Supplier Material materials with Molybdenum of 1.1 - 1.5 % | |
Nickel | 0.75 - 1.5 % Show Supplier Material materials with Nickel of 0.75 - 1.5 % | |
Phosphorus | 0.04 Show Supplier Material materials with Phosphorus of 0.04 | max. |
Silicon | 1.0 Show Supplier Material materials with Silicon of 1.0 | max. |
Sulfur | 0.15 - 0.27 % Show Supplier Material materials with Sulfur of 0.15 - 0.27 % |
Technological properties
| Property | ||
|---|---|---|
| Application areas | ||
| Corrosion properties | The best corrosion resistance properties are obtained in the quenched and tempered condition. Polishing increases the corrosion resistance even further and a passivation treatment is recommended. Under such conditions, this grade will be water and vapour resistant. If the grade was tempered at too high a temperature, the corrosion resistance will be impaired by carbide segregation precipitation at the grain boundaries. Annealing must not be carried out at temperatures between 400°C and 580°C as this will affect corrosion resistance. | |
| General machinability | Best machinability is obtained in the skin-passed condition (Rm: 800 – 950 MPa). Grinding and polishing are recommended to obtain a finer surface finish for optimum corrosion resistance. Localised overheating during grinding must be avoided, as this could affect the corrosion resistance. | |
| Heat Treatment | UGI® 4121 can be hardened by a quenching treatment from 1030°C to 1070°C and by tempering. Softening: soft annealing between 780°C and 830°C, slow cooling 30°C/h down to 600°C followed by air cooling. Softening annealing (subcritical): between 650°C and 760°C, followed by air cooling Intermediate annealing during cold deformation: preferably between 650°C and 680°C, followed by air cooling Quenching: oil quenching between 980°C and 1050°C, fast air or gas quenching Tempering: tempering is used to adjust the mechanical characteristics of the products, as shown on the right side of the material page. The tempering temperature range from 100°C to 300°C enables an optimum compromise between mechanical strength and corrosion resistance to be obtained. The temperature range between 400°C and 580°C must be avoided to prevent embrittlement and the associated reduction in corrosion resistance. Tempering must be carried out as soon as possible after quenching. The tempering temperature must rise slowly to avoid any distortion and cracking of sophisticated geometry parts. | |
| Other | Available products: Other formats: contact the supplier | |
| Surface polishing | The presence of a large number of manganese sulphide inclusions (MnS) can reduce the quality of the polishing and its productivity. That is why optimal polishing is obtained on products in the quenched and tempered condition at low temperature < 200°C. | |
| Welding | This grade cannot be welded. Soft soldering is still possible. | |