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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.