1.7218 25 CrMo 4

 

 

This grade is medium-carbon, chromium-molybdenum steel. Available as hot worked  and cold finished bar and seamless tube, this grade is intended for general purpose applications. Variations in heat treatment can obtain a broad range of strength and toughness. This steel has good hardenability, strength, wear resistance, toughness, and ductility. In the heat treated condition, they offer good strength and toughness for moderately stressed parts. This grade is available in forging quality, aircraft quality, and premium aircraft quality steel

 

Composition:

%C %Si %Mn %P %S %Cr %Mo %Ni  % Others
0,22-0,29 ≤0,40 0,60-0,90 0,035 0,035 0,90-1,20 0,15-0,30 – –

Hot working:

Forging temperature range: 1050-870℃

Note: Heat to 1230 ℃ (maximum heating temperature). Do not forged below 870 ℃

 

 

Heat treatment:

Soft annealing ℃ HB 30-soft annealed Normalizing ℃ Hardening temperature for quenching in Water ℃ Hardening temperature for quenching in Oil ℃ Tempering temperature ℃
680-720 212 860-900 840-870 850-880 540-680

 

Main application:

Axle arbors, axle arms, turbine components for cold

Shape of product:

Round, flat, step shape, ring, disc, shaft, other shape depend on customer needs