e.t.d. 150®
Chemical Composition
Carbon (C)             .40 Min
Manganese (Mn)    .70/1.10
Silicon (Si)              .15/.35
Chromium (Cr)       .80/1.20
Molybdenum (Mo)  .15/.25

*e.t.d.®150® contains additives improving machinability. These may be tellurium, selenium, sulfur, or others.
Tensile Strength: 150,000 psi (Min)
Yield Strength:    130,000 psi (Min)
Elongation:          5% (Min)
Reduction of Area:  20% (Min)
Machinability:  75% of 1212 (Approx.)
Rockwell C Hardness: *32 (Min)
Brinell Hardness: *302

*In the event of disagreement between hardness and tensile strength, the tensile strength shall govern.
Typical Uses
  • Pinions
  • Shafts
  • Gears
  • Axles

Elevated Drawing Steel | Carbon 4100 Alloy Steel

e.t.d.® 150® steel rounds are produced from AISI medium carbon 4100 series alloy steel. The heats to be used for e.t.d. 150® are controlled to contain nitrogen in quantities normally associated with steel produced by the electric furnace process. Only one additive, such as tellurium, selenium, or sulfur is also added to improve machinability. Like Fatigue-Proof®, it is another Niagara LaSalle high-strength material made by using specially designed dies. It eliminates heat treating and secondary operations such as straightening, finish grinding, cleaning, and inspections. e.t.d.® 150® can be roll threaded, knurled, and plated. Suitable for induction hardening, e.t.d.® 150® is also electromagnetically tested using eddy currents and pretested for machinability through Niagara LaSalle’s unique testing procedure.

Machining e.t.d. 150

The addition of a machining additive in e.t.d.® 150® has greatly improved its machinability. Considering its strength and hardness, the machining success of this material has been better than expected. Drilling, reaming, and forming seldom cause trouble. Chips break up well and are disposed of easily. It is suggested you break sharp corners on all tools wherever possible. A lead angle as long as possible is recommended in threading and tapping, and some coarse threads may require two passes, rough and finish threading. When roll threading, keep dwell or idle time to 1 or 2 revolutions and use a rigid setup. Standard high-speed tools equivalent to T-15 or M-42 should be used along with a sulfur/chlorinated cutting oil.

Why do People Choose e.t.d. 150 Steel Bar?

Alro stocks e.t.d. 150® in round bars. This material was developed to provide manufacturers a machinable steel bar material, with in-the-bar strength, which they can use to design and produce parts that require higher levels of strength (150,000 psi min tensile and Rc 32 min hardness). Normally, to obtain strengths approximating this level, manufacturers have to specify a carbon or alloy steel heat-treated in the bar, or purchase steel in the annealed condition and quench and temper the part after machining. Engineers have often found either method a costly, time-consuming, and unsatisfactory solution. Both methods usually create additional production problems and require extra processing. Poor machinability, rejections from quench cracks, and a lack of uniform surface to center hardness problems that frequently add costs. Also, heat-treating involves materials handling, extra parts in the process, cleaning, straightening, and grinding - all problems that can be avoided when you don’t have to heat treat to obtain desired strength. Our e.t.d.® 150® meets AMS 6378 specifications.

*e.t.d.®150® contains additives improving machinability. These may be tellurium, selenium, sulfur, or others.