Designation by Standards
| Steel No. | DIN | EN | AISI | JIS | ГОСТ |
| 1.4122 | X39CrMo17-1 † | X39CrMo17-1 | 440A | / | / |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.39 | max. 1.00 | max. 1.50 | 17.00 | max. 1.00 | - | - | - | - |
Description
Stainless steel with very good wear, corrosion reistance and industrial polishability.
Applications
PK335 is used for pump shafts, fitting and compressor parts, as well as steam and water control valves and boat shafts for use in fresh water.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 223
Density [g/cm3]: 7.71
Thermal conductivity [W/m.K]: 15
Electric resistivity [Ohm mm2/m]: 0.80
Specific heat capacity[J/g.K]: 0.43
Coefficient of Linear Thermal Expansion 10-6 oC-1
| 20-100oC | 20-200oC | 20-300oC | 20-400oC | 20-500oC | 20-600oC | 20-700oC | 20-800oC |
| 10.7 | 11.7 | 11.7 | 11.7 | 11.8 | 11.9 | 12.4 | 12.9 |
Modulus of Elasticity [103 N/mm2]
| 100oC | 200oC | 400oC |
| 223 | 205 | 190 |
Thermal conductivity [W/m.K]
| 20-200oC | 20-200oC | 20-400oC |
| 10.4 | 10.8 | 11.6 |
Soft Annealing
Heat to 750-880oC, cool slowly in furnace or air. Structure is ferrite with spherical carbides. This will produce a maximum Brinell hardness of 250.
Hardening
Harden from a temperature of 980-1050oC followed by oil quenching. Hardness after quenching is 49 HRC.
Tempering
Tempering temperature: 150-200oC, 650-750oC
Mechanical Properties at Room Temperature
| Size range mm | Heat treatment condition | 0.2 % proof stress (N/mm2) | Tensile strength (N/mm2) | Elongation (%) | Notch impact energy (ISO-V) (J) |
| d<=60 | Q+T 750 | 500 | 750-950 | 12 (Long) | 20 (Long) |
| 61<d<=160 | Q+T 750 | 500 | 750-950 | 12 (Long) | 14 (Long) |
0.2 % Proof Stress (N/mm2) at Elevated Temperatures
| 100oC | 150oC | 200oC | 250oC | 300oC | 350oC | 400oC |
| 540 | 535 | 530 | 520 | 510 | 490 | 470 |
Forging
Hot forming temperature: 1100-800oC, slow cooling.
Machinability
Metal-cutting machining is the same as for special engineering steel grades of corresponding strength.
Welding
Limited weldability using the manual arc and TIG welding processes, as hardening occurs in the heat-affected zone. Preheat to between 300 and 400oC. Filler metals: 1740, Nicro82.
Remark
All technical information is for reference only.