18crmo4(1.7243) Hot Forged Square Bar and round bar

APPLICATIONS:

usually being used at the quenched and tempered or case hardening state,for the manufacture of non-corrosive media and working temperature below 250 , the medium containing a mixture of nitrogen and hydrogen in the work of a variety of high-pressure pipes and fasteners, the higher the infiltration carbon components, such as gears, shafts and so on.

2, RELATED SPECIFICATIONS:

USA           ASTM 4118

Japan          JIS SCM420

China       20CrMo 

3, Chemical Composition (%):

C:0.15-0.21

Si:0.4max

Mn:0.6-0.9

P:0.035max

S:0.035max

Cr:0.9-1.2

Mo:0.15-0.25

4, Process:  EAF+LF+VD+Forged+Heat Treatment(optional)

5, SIZE RANGE: 

Round: 

Hot Forged:  80mm-1500mm 

6, SURFACE FINISHES: 

Black,  Turned 

7, Test: Ultrasonic test according to SEP 1921-84

Normalizing
Normalizing temperature: 860-900oC.

Hardening
Harden from a temperature of 850-880oC followed by oil or water quenching. Hardness after quenching is 39-47 HRC.

Tempering
Tempering temperature: 595-700oC.

Forging
Hot forming temperature: 1100-850oC.

Certificate of Quality: issued in English, in addition the normal terms, production process, the mechanical property yield strength, tensile strength, elongation and hardness, forged ratio, UT test result, Grain size, heat treatment methods and the sample of is shown on the Certificate of Quality.