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100CrMn6 Modified
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Material Analysis
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Carbon
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0.92 to 1.05%
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Chromium
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1.40 to 1.65%
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Manganese
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1.00 to 1.20%
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Silicon
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0.55 to .070%
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Phosphorus
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0.025% Max.
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Sulphur
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0.008% Max.
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Hardness
100CrMn6 modified chrome alloy steel rollers have a uniform hardness in the range from 58-64, as measured on parallel flats using the Rockwell C scale.
Applicability
100CrMn6 modified alloy steel rollers offer high hardness and excellent resistance to wear and deformation. 100CrMn6 modified chrome material provides higher core hardness versus chrome alloy steel. They are made from the finest bearing quality steel. 100CrMn6 modified material is specified by precision bearing manufacturers where precise spherical and tolerance accuracy are required. NN typically offers chrome alloy steel for roller diameters from 7/8" to 2-3/8".
AISI 52100 Chrome Alloy Steel
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Material Analysis
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Carbon
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0.98 to 1.10%
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Chromium
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1.30 to 1.60%
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Manganese
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0.25 to 0.45%
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Silicon
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0.20 to .035%
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Phosphorus
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0.025% Max.
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Sulphur
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0.025% Max.
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Mechanical Properties
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Tensile strength
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325,000 psi
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Yield strength
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295,000 psi
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Elongation in 2"
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5%
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Reduction in area
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8%
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Modulus of elasticity
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29,500,000 psi
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Density
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0.283 lbs/cu. in.
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Hardness
52100 Chrome alloy steel rollers have a uniform hardness of 60-66, as measured on parallel flats using the Rockwell C scale, regardless of size or grade.
Applicability
52100 Chrome alloy steel rollers offer high hardness and excellent resistance to wear and deformation. They are made from the finest bearing quality steel. 52100 material is specified by precision bearing manufacturers where precise spherical and tolerance accuracy are required. NN typically offers chrome alloy steel for rollers smaller than 7/8" diameter.
AISI Type 440-C Stainless Steel
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Material Analysis
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Carbon
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0.86 to 1.20%
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Chromium
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16.0 to 18.0%
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Manganese
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1% Max.
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Silicon
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1% Max.
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Phosphorus
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0.025% Max.
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Sulphur
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0.025% Max.
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Nickel
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0.75% Max.
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Molybdenum
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0.40 to 0.65%
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Copper
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0.5% Max.
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Mechanical Properties
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Tensile strength
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285,000 psi
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Yield strength
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approx. 275,000 psi
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Elongation in 2"
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2%
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Reduction in area
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10%
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Modulus of elasticity
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29,000,000 psi
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Density
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0.277 lbs/cu. in.
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Hardness
Type 440C stainless steel rollers have uniform hardness of 58-65, as measured on parallel flats using the Rockwell C scale.
Applicability
Type 440C stainless steel rollers offer maximum uniform hardness and good corrosion resistance. Suited to valve and bearing applications, they are resistant to fresh water, crude oil, gasoline, alcohol and food stuffs.
AISI S-2 (Rockbit) Tool Steel
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Material Analysis
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Carbon
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0.47 to 0.52%
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Molybdenum
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0.40 to 0.50%
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Silicon
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0.90 to 1.10%
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Manganese
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0.30 to 0.50%
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Chromium
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0.20% Max.
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Mechanical Properties
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Tensile strength
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approx. 310,000 psi
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Yield strength
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approx. 290,000 psi
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Elongation in 2"
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7 to 8%
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Reduction in area
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25%
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Modulus of elasticity
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30,000,000 psi
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Density
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0.286 lbs/cu. in.
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Hardness
Rock bit balls and rollers have a uniform hardness of 54-60, Rockwell C scale, using the parallel flat method.
Applicability
Suited to extreme conditions common to oil drilling, the material provides toughness, strength, shock and abrasion resistance. |
