These are oil-hardening steels of relatively high hardenability. Their chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. These grades are especially suitable for forging because they have self-scaling characteristics. They respond readily to heat treatment and are comparatively easy to machine in the heat treated condition. They resist creep in temperatures up to 1000°F and maintain their properties even after long exposuremore
Unit of Measure

Specifications

Estimated Weight per Foot

.1671 lb

Estimated Weight 12-Ft. Bar

2.005 lb

Analysis

N/A Carbon .40/.45
Manganese .75/1.00
Phosphorus .035 Max.
Sulphur .04 Max.
Si. .15/.35
Cr. .80/1.10
Mo. .15/.25
The analyses of the leaded grades are the same as above with the addition of .15/.35 Lead (Pb).

Applications

N/A Drill collars, kelly bars, bolts, subs, couplings, reamer bodies, rotary table shafting, oil well tool joints, axle shafts, valves, high-temperature bolts, sprockets, trailer axles, winch shafts, piston rods, rams, hydraulic machinery shafts, precision lead screws, chain links, spindles, stay bolts, tractor axles, tractor arms, zinc die-casting dies, etc.

Mechanical Properties

N/A 1 1/2" and Under
Tensile Strength - 130,000 psi Min.
Yield Point - 110,000 psi Min.
Elongation in 2" - 16% Min.
Reduction of Area - 50% Min.
Surface Brinell Hardness - 269-321

Over 1 1/2" to 2 1/2"
Tensile Strength - 125,000 psi Min.
Yield Point - 105,000 psi Min.
Elongation in 2" - 16% Min.
Reduction of Area - 50% Min.
Surface Brinell Hardness - 269-321

Over 2 1/2" to 4"
Tensile Strength - 115,000 psi Min.
Yield Point - 95,000 psi Min.
Elongation in 2" - 16% Min.
Reduction of Area - 45% Min.
Surface Brinell Hardness - 269-321

Over 4" to 7"
Tensile Strength - 135,000 psi Min.
Yield Point - 105,000 psi Min.
Elongation in 2" - 14% Min.
Reduction of Area - 35% Min.
Surface Brinell Hardness - 285-341

Over 7" to 9 1/2"
Tensile Strength - 130,000 psi Min.
Yield Point - 100,000 psi Min.
Elongation in 2" - 14% Min.
Reduction of Area - 35% Min.
Surface Brinell Hardness - 285-341

Weldability

N/A Difficult to weld, but can be welded by any of the common welding processes providing section is preheated, and stress relieved after welding. The grade of welding rod to be used depends upon thickness of section, design, service requirements, etc. When welding leaded material, adequate ventilation should be provided to prevent accumulation of fumes.

Forging

N/A Heat to 2100°-2200°F

Normalizing

N/A Heat to 1600°-1700°F. Cool in air. Average Brinell Hardness, 285.

Annealing

N/A Heat to 1450°-1550°F. Cool slowly in furnace. Average Brinell Hardness, 187.

Hardening

N/A Hardening range is between 1525° and 1625°F. Quench in oil. A wide range of mechanical properties can be obtained by tempering between 400° and 1300°F.