Heat Treatment Chromoly Round Bar 40Cr ASTM 5140 JIS SCR440 For Shaft Parts

Heat Treatment 40Cr ASTM5140 JIS SCR440 Quenching and Tempering Alloy Round Bar For Shaft Parts

Outer Diameter: 10-60mm

Material:40Cr ASTM5140 JIS SCR440

40Cr steel is one of the most widely used steels in machinery manufacturing. After quenching and tempering treatment, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity.

Chemical Composition

Mechanical properties:
Sample blank size (mm): 25
Heat treatment:
The first quenching heating temperature (℃): 850.

Coolant: oil
Tempering heating temperature (℃): 520;

Tensile strength (σb/MPa): ≥810 (when the actual hardness is 25HRC)
Yield point (σs/MPa): ≥785
Elongation after break (δ5/%): ≥9
Area shrinkage (ψ/%): ≥45
Shock absorption energy (Aku2/J): ≥47
Brinell hardness (100/3000HBW) (annealed or tempered at high temperature): ≤207

Delivery Stauts
Quenching and Tempering State

Hardness

≤207HBW

Application

(1)It is used to manufacture mechanical parts under medium load and medium speed working conditions, such as steering knuckles of automobiles, rear axle shafts and gears, shafts, worms, spline shafts, top sleeves, etc. on machine tools

(2)It can also be quenched and tempered and high After frequency quenching, it is used to manufacture parts with high surface hardness and wear resistance without large impact, such as gears, sleeves, shafts, main shafts, crankshafts, mandrels, pins, connecting rods, screws, intake valves, etc.; It can also be quenched, medium or low temperature tempered to make parts under heavy load

Our Company

Main standards: DIN2391, DIN2445, EN10305, DIN1629, DIN1630, ASTM A179.

Over the years, we have worked hard to promote and realize the modernization of seamless steel pipes' sales, and actively cultivated and enhanced the ability of employees' independent innovation. All-round renovation and upgrade of the original business site, facilities and equipment, and modern computer management. Hope to establish long-term partnerships and win market reputation.