4140 Steel Plate | Precision Grinding, Inc.

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4140 Steel Plate

4140 Steel General Information4140 steel plate

4140 alloy steel is a low alloy steel that contains chromium, molybdenum, and manganese. Because it contains chromium and molybdenum, it is sometimes referred to as chromoly steel.  It has high fatigue strength, excellent strength to weight ratio,  is abrasion and impact resistant, has good ductility, and has excellent torsional strength.

4140 steel plate can be plasma or flame cut to shape, then annealed onsite in our furnace.  Annealing greatly improve results from grinding and increases it’s machinability. A thorough annealing is also required before quench and tempered hardening processes.

Purchased as rolled, pre-Hardened (PH), or in the annealed condition, 4140 steel plate possesses a full range of hardening and wear resistance properties. Due to it’s good hardness penetration and uniformity flame hardening, induction hardening, or oil hardening can considerably increase the wear resistance of 4140 steel.

4140 PH has the same industry standard chemistry as 4140 plate HR plate but with an industry standard Rockwell C Hardness rating of 28 – 32.

Looking for a quick estimate on 4140 steel? Call us at 888-934-7463 or submit a Request for Quote now!

Common Uses of 4140 Steel Plate

4140 steel can be used for a wide variety of applications where better wear resistance and toughness is needed over normal carbon steels.

Common uses of 4140 steel plate: tooling, machine plates, gears, shafts, sprockets, special machine parts, molds, metal stamping, tool & die, shredders, couplings, reamer bodies, screws, flywheel components, axles, shafts, bolts, sprockets, piston rods and rams.

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Work Qualities

4140 steel has good machinability when annealed.  4140 steel is not easily welded and post weld treatment should be performed.  It can be formed using conventional techniques when annealed and requires more pressure when forming because it is tougher than plain carbon steels.

4140 steel physical properties table  
Steel Type Alloy
ASTM Designation ASTM 4140
Common PGI Inventory 0.375″-4.00″ inquire for thicker plate
Minimum Yield Stress (ksi) 60.2
Average Tensile Strength (ksi) 95
Elongation at Breakage 25.7%
Brinell Hardness 197
Knoop Hardness 219
Approximate Hardness (Rb) 92
Approximate Hardness (Rc) 13
Vickers Hardness 207
Machinability 0.65

4140 steel chemical composition table  
% Carbon (C) 0.380 – 0.430
% Chromium (Cr) 0.800 – 1.10
% Iron (Fe) 96.785 – 97.77
% Phosphorus (P) 0.035
% Silicon (Si) 0.150 – 0.300
% Sulfur (S) 0.040

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