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ALLOYS

8630M

AISI 8630 MOD: ASTM A-29, & API SPEC 6A

GENERAL SCOPE:

8630 Mod is a low alloy steel that is used in wellhead equipment, blowout preventers, and hangers requiring deep hardening strength with excellent impact resistance. It is a heat treatable alloy steel that contains nominally .30% Carbon, with .90% Chromium, .80% Nickel and .40% Molybdenum as the primary hardening elements.

ADDITIONAL INFORMATION:

This alloy is considered an upgrade over 4130 because it maintains good strength and excellent impact properties deep into the product.

CHEMICAL COMPOSITION:

C Mn P S Si Ni Cr Mo
Minimum 0.280 0.850 0.150 0.750 0.850 0.350
Maximum 0.330 1.000 0.025 0.025 0.350 0.900 1.000 0.450

COMMONLY STOCKED STRENGTH LEVELS:

80,000 psi or 85,000 minimum yield - limited to a Rockwell C -22 maximum for compliance NACE MR-01-75/ISO 15156 (for use in hydrogen sulfide environments)

Annealed or As-rolled - no mechanical properties; suitable for further heat treatment

COMMONLY STOCKED MATERIAL FORMS:

Rolled bar

Forged bar

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