Custom Chrome Molybdenum 42CrMo4 alloy steel  investment casting products for lock hook of automobile with electrophoresis surface treatment. 

42CrMo4 (1.7225) from specification of EN 10083-3, which is usually heat treated by QT (Queching + Tempering), is widely used to produce investment castings. it has high strength, high toughness, good hardenability, temper brittleness, high fatigue limit, good impact resistance after quenching and tempering, and good low temperature impact toughness. The equivalent grade of 42CrMo4 are 4140 (ASTM, USA) and 42CrMo (GB/T 3077, China)

42CrMo4 steel properties at room temperature in the quenched and tempered condition.

Yield strength:
≥900 N/mm2 (d≤16mm, t≤8mm)
≥750 N/mm2 (16 < d ≤ 40mm, 8 < t ≤ 20mm)
≥900 N/mm2 (40 < d ≤ 100mm, 20 < t ≤ 60mm)
≥900 N/mm2 (100 < d ≤ 160mm, 60 < t ≤ 100mm)
≥900 N/mm2 (160 < d ≤ 250mm, 100 < t ≤ 160mm)

Tensile strength:
1100-1300 N/mm2 (d≤16mm, t≤8mm)
1000-1200 N/mm2 (16 < d ≤ 40mm, 8 < t ≤ 20mm)
900-1100 N/mm2 (40 < d ≤ 100mm, 20 < t ≤ 60mm)
850-950 N/mm2 (100 < d ≤ 160mm, 60 < t ≤ 100mm)
750-900 N/mm2 (160 < d ≤ 250mm, 100 < t ≤ 160mm)

Elongation: ≥ 10% (d≤16mm, t≤8mm)

Impact strength of longitudinal Charpy-V-notch test:
≥35J (16 < d ≤ 250mm, 8 < t ≤ 160mm)
≥11% (16 < d ≤ 40mm, 8 < t ≤ 20mm)
≥12% (40 < d ≤ 100mm, 20 < t ≤ 60mm)
≥13% (100 < d ≤ 160mm, 60 < t ≤ 100mm)
≥14% (160 < d ≤ 250mm, 100 < t ≤ 160mm)

42CrMo4+QT hardness in HRC: ≥53 (after flame or induction hardening)
42CrMo4 hardness in HBW: ≤255 (treated to improve shearability); ≤241 (soft annealed)

Carbon steel, low alloy steel, high alloy steel and tool steel castings are used in several industrial applications. With their numerous grades, steel and their alloys can be heat-treated to improve its yield and tensile strength and, adjust hardness or ductility to the engineer's application needs or desired mechanical properties.

Using the investment casting process, OBT casting foundry is capable of meeting material specifications according to ASTM, SAE, AISI, ACI, DIN, EN, ISO, and GB standards. We have more than 100 different ferrous and non-ferrous alloys with which we cast parts using complex design criteria. Our dimensionally and geometrically complex investment castings are produced to net shape, minimizing the need for secondary machining.

Chromium-molybdenum cast steel is widely used in industrial fields with relatively high mechanical properties. The addition of molybdenum to chromium steel can increase the strength of steel castings without having a significant impact on the impact toughness of cast steel. Moreover, chromium-molybdenum cast steel has very good high temperature performance and creep resistance. After quenching and tempering or normalizing heat treatment, chromium-molybdenum cast steel can obtain excellent mechanical properties.

Molybdenum can improve the hardenability of cast steel and reduce the temper brittleness of cast steel. Chromium-molybdenum cast steel is used for large-section castings and steel castings that require deep hardening.