Chemical Composition
Standard Analysis	C	Si	Mn	P	S	Cr	Ni	Mo
Min	0.28	0.15	0.7	-	-	0.4	0.4	0.15
Max	0.33	0.35	0.9	0.035	0.04	0.6	0.7	0.25
Modified Analysis	C	Si	Mn	P	S	Cr	Ni	Mo
Min	0.28	0.15	0.75	-	-	0.85	0.7	0.35
Max	0.33	0.35	0.95	0.035	0.04	1	0.9	0.45

 

Mechanical Properties
U.T.S	95 KSI Min
0.2% Proof Stress	75 KSI Min
Elongation	0.17
Red of Area	0.35

 

Application

Alloy Steel 8630 is utilized for various critical structural parts such as:

• Gears
• Ring gears
• Shafts and crankshafts
• Connectors, hangers, and block valves for the oil industry

 

Heat Treatment

Annealing: For optimum machine ability of this alloy, a microstructure consisting of coarse pearlite and a minimum of ferrite is considered to be optimum. Such a structure can be obtained by austenitizing at 1550ºF (845ºC), furnace cooling to 1350ºF (730ºC) then to 1180ºF (640º) at 20ºF/hr. An alternative is an iso-anneal at 1225ºF (660ºC)

Normalizing:1600ºF (870ºC) and air cool.

Hardening: The alloy will be austenitized at around 1525 – 1600ºF (830 – 870ºC) and oil or water quenched depending upon section size and intricacy.

Tempering: to desired hardness, using temperatures based on past experience, following water or oil quench.

 

Forming Option

• Hot rolling process
• Hot Forging: Electro-hydraulic; High-speed-hydraulic; Oil-hydraulic; Precision-forging

 

Heat-treatment Option

• +A: Annealed (full/soft/spheroidizing)
• +N: Normalized
• +NT: Normalized and tempered
• +QT: Quenched and tempered (water/oil)

 

Surface Option

• Black Surface
• Grounded: Bright but rough; Not precision
• Machining for plate: Bright and precision; Little turning scar
• Peeled/Turned: Bright and precision; Little turning scar
• Polished: Very Bright and precision size; Not turning scar

 

Mill test certificate

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.