FAQs

Some friend asks me Is 4140 A Tool Steel ? Actually, AISI / SAE 4140 steel is a kind of alloy steel. But it's a versatile steel material. Some people also use it as mold steel and tool steel.

ASTM 4140 big plate size is with width of 2000-2300mm. So, when big plate is cut to required 4140 flat bar size, then big plate width becomes the length of flat bar. 

Some customers ask for the Alloy Steel 4140 Plate Tensile Strength. In common rolled condition, the min tensile strength will be min 655Mpa.

What is 4140 DCF Steel Plate ? Decarb Free stands for DCF. It means 4140 steel plate has been ground top and bottom and is oversized to finish on the thickness, without the black surface.

Can you Harden 4140 Steel Plate? Yes. AISI 4140 alloy steel plate can be hardened by cold working, or heating and quenching or annealing.

AISI 4140 steel is alloy steel with chromium and molybdenum. But it is not recommended to weld on 4140HT plate.

What Does Alloy Plate 4140 HTSR Stand For? HTSR stands for Heat Treated, Stress Relieved. For alloy steel plate 4140, it's usually delivered as rolled, or prehard (Q+T) condition. But some customer will need it inside stress relieved.

Usually, it's 28-32HRC hardness for 4140 prehard alloy steel plate. It's designated as AISI 4140HT or 4140H.

Some customer asks, Is 4140 plate an alloy steel plate? Well, AISI 4140 plate is a steel material containing chromium, molybdenum and manganese containing and it's low alloy steel.

Is it ok for 4140 alloy steel plate mold steel ? Some customers ask us if they can use 4140 alloy steel plate mold steel. The anwser is Yes ! It's ok and widely used as mold steel, such as 4140 alloy mold for car industry.