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Product
Information |
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| Description |
Alloy Bars are fine grain
steels with significant additions of alloying elements. They exhibit
superior strength, toughness and abrasion resistance over non-alloy
bars. There are two general categories
of alloy steels: the high strength low alloy types which rely largely
on chemical composition to develop desired mechanical properties
in the as-rolled or normalized condition; and the constructional
alloy steels in which the desired properties are developed by thermal
treatment. |
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| Why Use Alloy Bar? |
*For Strength - Yield,
Tensile.
*For Toughness - Notch Impact Strength.
*For Fatigue Strength.
*For a balance between Strength and Toughness. |
*For Abrasion Resistance.
*For increased Corrosion Resistance.
*For increased Hardenability.
*For improved Mechanical Properties at low and high temperatures. |
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| Special Requirements |
Consider the following
for various grades of alloy bar to ensure you get bars that work
best for you:
1) Machinability
2) Additional Heat Treatment
3) Weldability
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| Heat Treatments
Available |
1) Quenched and Tempered
- Hardens the Steel
2) Normalized - Improves Machinability and Toughness
3) Annealed - Softens the Steel
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Carbon
Steel
vs.
Alloy Steel |
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Manganese |
Silicon |
Copper |
| Carbon
Steel: |
Less than
1.65% |
Less than
0.60% |
Less than
0.60% |
| Alloy
Steel: |
Greater than
1.65% |
Greater than
0.60% |
Greater than
0.60% |
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Types |
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Elements |
Applications |
| 4140 / 4145 |
Chrome Moly Steel |
Shafts, bolts, studs, drill colalrs and kelly
bars. |
| 4340 |
Nickel, Chrome, Moly Steel |
High strength machine parts,
heavy duty shafting, gears, axels and down hole tool drilling
components |
| 4330 |
Nickel, Chrome, Moly Steel |
Down hole tool parts, heavy duty shafts, bit
bodies and rigging pins |
| EN30B |
Nickel, Chrome, Moly Steel |
Down hole tool parts, heavy
duty shafts, bit bodies and rigging pins |
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Mechanical
Properties |
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4140
HTSR |
4145
HTSR |
4330
VMod |
4340
HTSR |
EN30B |
| Tensile
Strength |
(psi) |
140,000 |
135,000 |
160,000 |
160,000 |
160,000 |
| Yield
Strength |
(psi) |
110,000 |
110,000 |
150,000 |
135,000 |
135,000 |
| Elongation |
(%) |
14 |
13 |
14 |
11 |
13 |
| Reduction
of Area |
(%) |
35 |
40 |
50 |
30 |
50 |
| Hardness |
(HBN) |
285-345 |
285-345 |
321-375 |
320-350 |
321-363 |
| Charpy
impact at RT |
(Ft/Lbs) |
20 |
40 |
45 |
25 |
60 |
| Charpy
impact at 14F |
(Ft/Lbs) |
--- |
30 |
--- |
15 |
--- |
| Charpy
impact at -50F |
(Ft/Lbs) |
--- |
-- |
--- |
--- |
15 |
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Rough-Turning |
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| Description |
At Wilkinson Steel and
Metals, the majority of our alloy bars are rough-turned after being
machine straightened.
Rough-turning is the finishing procedure where the scale of a hot
rolled bar is removed by machining with carbide tools. The thickness
of the material removed averages around 3% to 5% of the as-rolled
diameter.
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| Features |
*Bar surfaces are without
defects.
*No Hairline Cracks
*Decarburization zone has been removed
*Good surface finish (125 micro-inch) |
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| Benefits |
*Less machining time.
*Less material removal.
*You will save inserts since the scale has been removed.
*Your finishing and machining operations are simplified: no roughing,
therefore less set up time.
*Less material cost: for example, to finihs at 6.750" you can
usualy order 6.850" rough turned instead of 7" hot rolled*.
*Bar straightness tolerances may need to be considered, depending
on the length of your finished piece.
*1/8" in any 5 ft.; but may not exceed: [ (1/8") X (#
of Ft. in Length) ] / 5
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