PK335
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
PK335 335 1.4122 X39CrMo17-1 - -

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
0.39 max. 1.00 max. 1.00 16.50 1.05 max. 1.00 - - -

 

General Information

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.

 

Properties

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
20-100 'C 20-200 'C 20-300 'C 20-400 'C 20-500 'C 20-600 'C 20-700 'C 20-800 'C
10.7 11.7 11.7 11.7 11.8 11.9 12.4 12.9

Modulus of Elasticity [103 N/mm2]
100 'C 200 'C 400 'C
223 205 190

Thermal conductivity [W/m.K]
20-200 'C 20-200 'C 20-400 'C
10.4 10.8 11.6

Continuous Cooling Transformation (CCT) Diagram

Time-Temperature Transformation (TTT) Diagram

 

Heat Treatment

Soft Annealing
Heat to 750-880 'C, 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 980-1050 'C followed by oil quenching. Hardness after quenching is 49 HRC.

Tempering
Tempering temperature: 150-200 'C, 650-750 'C

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 Q+T 750 500 750-950 12 (Long) 14 (Long)

0.2 % Proof Stress (N/mm2) at Elevated Temperatures
100 'C 150 'C 200 'C 250 'C 300 'C 350 'C 400 'C
540 535 530 520 510 490 470

Diagram Hardness vs. Temperature

 

Workability

Forging
Hot forming temperature: 1100-800 'C, slow cooling.

Machinability
Metal-cutting machining is the same as for special engineering steel grades of corresponding strength.
 
Other Information


Welding: Limited weldability using the manual arc and TIG welding processes, as hardening occurs in the heat-affected zone. Preheat to between 300 and 400 'C. Filler metals: 1740, Nicro82.