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QUALITY BAR
17 Union Street, Building 7
Struthers, OH 44471
330-755-0000


WE SELL LARGE
DIAMETER HOT
ROLLED BARS.
CAN SHIP ON
SAME TRUCK AS
TGP BARS

Finished Bars In Stock

Grade: 4140 QT

Diameters

Weight (In Stock)

0.75 8165
1.9375 1473
2.4375 2704
4.9375 1538
5.5 3854
Diameters

 

4140 QT is a direct hardened alloy that is quenched and tempered to obtain a wide range of hardness, ductility and strength levels. Alloying elements include chromium and molybdenum. They have an excellent strength-to-weight ratio and are considerably stronger and harder than standard 1020 steel, but are not easily welded (need pre and post weld thermal treatment to avoid cold cracking). While these grades of steel do contain chromium, it is not in great enough quantities to provide the corrosion resistance found in stainless steel. The quenching process hardens the steel, while the tempering process restores some of the ductility and removes some of the brittleness acquired during heat treating.

Typical Uses Include: Drill collars - Bolts - Subs - Couplings - Reamer bodies - Joints - Shafts - Valves - Sprockets - Axles - Piston rods - Rams - Screws

QB stocks 4140 QT (Quench & Tempered/Heat-Treated) TG&P (Turned Ground & Polished) and T&P (Turned & Polished) steel bar.