440C

Stainless steel HuaNickel 440C is a high-carbon martensitic stainless steel. As a martensitic stainless steel, HuaNickel 440C is magnetic and can be hardened by heat treatment. The high carbon content in 440C has high hardness and strength. Despite the high carbon content, the chromium content is still enough to maintain its stainless steel properties. Martensitic steels are typically used in applications that require high strength and moderate corrosion resistance.

440C Chemical composition：

	Cr	C	Mn	Si	Mo	P	S	Fe
Min	16	0.95	–	–	–	–	–	Bal
Max	18	1.2	1	1	0.75	0.04	0.03

440CPhysical properties：

Density	0.275 lb/in³
Melting point	2500 – 2700°F

440CMechanical properties：

Temperature, °F	70
Ultimate tensile strength, ksi	285
0.2% yield strength, ksi	275
Elongation, %	2
Reduced Area, %	10
Hardness, Brinell	580

440CStainless steel characteristics：

After heat treatment, the highest hardness of any stainless steel can be achieved

The highest carbon content of HuaNickel 400 series stainless steel

440CUses of stainless steel：

Seat

Surgical instruments

Bearings, casings, nozzles

Structural aircraft components

440CProcess performance：

Welding properties: Due to its high hardness, this steel is rarely welded. However, if welding is required, the parts should be preheated and held at about 500°F, welded, and then immediately annealed at 1350/1400°F for 6-8 hours, slow furnace cooling. Between welding and annealing, parts are not allowed to cool below 500°F.

Heat treatment: Preheat to 1400/1500°F, then slowly and evenly heat to 1900/2100°F. Do not forge below 1750°F and reheat frequently if necessary. Heat and cool slowly. The forging is annealed and cooled to room temperature before annealing

Relevant standards：

ASTM: A 276 AMS: 5630, 5880