AISI / Alloy Steel 8630

Chemical Analysis
C% Carbon
0.28 – 0.33
Mn% Manganese
0.70 – 0.90
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Ni% Nickel
0.40 – 0.70
Cr% Chromium
0.40 – 0.60
Mo% Molybdenum
0.15 – 0.25

General characteristics of Alloy Steel 8630

Alloy steel 8630 is a low-alloy steel containing nickel, chromium and molybdenum as alloying elements. The alloy has good hardenability, and good strength and toughness properties.

Applications

This alloy finds oil patch applications as forged connectors, hangers and block valves.

Forging

This alloy is forged at a start temperature of around 2200ÂşF (1205ÂşC) and could be forged down to approximately 1700ÂşF(925ÂşC.) The alloy may be transferred to a furnace held at a temperature approximating the forging finishing temperature, soaked then air cooled.

Heat treatment

Annealing:For optimum machinabilty 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 1550ÂşF (845ÂşC), furnace cooling to 1350ÂşF (730ÂşC) then to 1180ÂşF (640Âş) at 20ÂşF/hr. An alternative is an iso-anneal at 1225ÂşF (660ÂşC)

Normalizing:1600ÂşF (870ÂşC) and air cool.

Hardening:The alloy will be austenitized at around 1525 – 1600ÂşF (830 – 870ÂşC) 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.

Machinability:This grade of alloy is readily machined following suitable heat treatment.

Weldability:This steel may be welded by normal fusion methods, but prior to hardening and tempering. Pre heat and post heat may be necessary depending upon intricacy of part.

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